Underdrive Pulley Problems

the NST pulley will be in the 20's. A underdrive pulley is a very inexpesnive mod that increases power, makes the car rev faster, and is overall a good modification. Pulley System Type Problems Part 2-Engineering Mechanics-Assignment Solution, Exercises for Dynamics Spring Problems Part 2-Engineering Mechanics-Assignment Solution. It works very well for me and I have had no problems for over a year now. In this Investigation, you will be testing factors that might infl uence the actual mechanical advantage of pulley systems. Park idle and driving charging and cooling was never a issue. Install underdrive pulleys in a 4. Also includes belts, high grade bolts, and instructions. I welcome differing opinions and will post anyone comments if they request. Choose an underdrive pulley from JEGS, BBK, Holley, SLP and more! JEGS also carries a full line of dress-up auto pulleys. This pulley is yet another redesign of the famous MPx pulley that has been out for the since 2003. With my mustang I was running an UD crank pulley but with the stock alternator if the E fan kicked on it would not put out enough to properly run both the fuel pumps at idle so when the E fan turned on at idle it got pretty choppy. ALL I DID WAS CHANGE THE PULLEYS BACK TO STOCK PULLEYS AND ADD A 160 thermastat. aftermarket underdrive pulleys will cause nothing but problems for your engine balancing Click to expand Ehh thats a myth. Replacing a broken, cracked or worn out alternator pulley is not very difficult, and it's something you can do yourself in half an hour or so. 583 I think this will be too slow for my alternator (I am not using the corvette alternator so it may be different for you). The Under Drive Pulley debate. my car is a manual 6 speed with all bolt ons and stock internals. Q: What kind of problems can underdrive pulleys create? This will really depend on your car and the situations regarding how you drive the car and where you live. Figured it was a good price for a lighter set. 93-01 Honda Prelude Light Weight Aluminum Crank Pulley H22 H22A1 H22A4 VTEC // PART # CP040 Underdrive Single Belt Crank Pulley Acura Integra Honda Civic Si CRV. I am not going to go into details, but it an undampened crank pulley will eventually lead to serious problems. Nice to know I'm not the only one bothered by the rust, I will defiantly be powder coating it. At the bottom in fine print under reviews it states the part after running one for a bout a year or so will warp your crank shaft. i was looking to get a set of underdrive pulleys, not sure if i should do an alternator upgrade before then. They have had there 19% pulley on for 5000 Km with out any problems (they are also running cam, headers, exhaust, intake). If we swap our imaginary small-block's 651/48-inch crank pulley to a smaller 5-inch crank pulley, we can underdrive the water and power-steering pumps by the right amount, but not without also. So this morning I jacked up the front end and removed the harmonic balancer. Introducing the new Version 3 MPx Underdrive Pulley for the 03-05 Neon SRT-4 & 01-10 PT Cruiser. So i ordered a pair of the underdrive pulleys ffrom summit but i dont know what kind of belt to put on her because the cam shaft pulley is smaller than the stock pulley and the alternator pulley is a little bigger. i am worried about my stock alternator having trouble keeping up with the power being drawn while at idle and low speeds with the underdrive pulleys. So I went inside and and read into underdrive pulleys and it wasn't until then that I learned that the purpose behind them was to slow the rotation of the other pulleys to refuse drag. BBK Aluminum Under drive Crank Pulley for Ford Mustang 3. Underdrive Pulley for Porsche 996/997/Boxster 986 Brand: RSS The RSS Lightweight Underdrive Pulley is made from 6061-T6 aluminum. T-6061 Aircraft Lightweight Billet Aluminum constructed & harden anodized. PONTIAC 350, 400, 428 & 455 V8 ENGINES. The under drive pulley is probably one of the cheapest and most popular add-ons that you could get for your vehicle today. 25 Years, Made in America!. I would be very careful with putting on a underdrive pulley. 4L incorporates a number of high quality features you won't find on any other aftermarket unit and makes up to 9 additional rear wheel horsepower and 10 ft-lbs of rear wheel torque over the stock crankshaft pulley. He did say that when you're idling, you are pulling partially off the battery, so it'd be a problem in regular bumper to bumper traffic. The use of a jaw style puller, or ANY kind of puller that attaches to the pulley's outer lip will break the pulley! 79-93 SBF 5. Re: Under Drive Pulleys. i didn't put the alternator pulley on,the one i have is about the same size. ive heard the same thingnot an expert on all this but thats what i knowhope that helps. Don't forget to scribe a TDC line on the crank pulley and smear some RTV between the pulley and crank bolt washer to prevent any oil leakage. one, the diameter of our crank pulleys is smaller than the original designs, in almost all cases smaller even than the rubber torsional ring, therefore effectively reducing the force the accessories have on the crankshaft. The self-propel system on a Troy-Bilt lawnmower is relatively simple. Powerbond 25% Underdrive Pulley Installed on 2009. What does a complete blower kit contain? A complete blower kit contains the Blower, Drive Kit, Intake Manifold, Carburetor Adapter, and all the necessary bolts, pulleys, and gaskets. Gains of up to 10 horsepower can be expected. It doesn't appear that ASP has a listing for a pulley for the G8's though. First off a few disclaimers: This page deals ONLY with the 3000GT/Stealth cars and Unorthodox Racing's under drive pulleys. 6 motors not our 5. JET 90501 Underdrive Pulleys. It slowed it down so that sometimes the car died when I used a lot of electronics. Both the power steering and sea pump pulley use mandrel mounting features that protect the pulley from undue shaft heat. i havnt seen one person claim the powerbond has caused problems. An underdrive damper reduces the accessory pulley rpm, which can lead to moderated charging system output voltage, somewhat higher engine temp at low speed rpm, and less HVAC cooling. I had an Unorthodox Racing underdrive pulley on my old Civic Si along with a lightened flywheel, ACT clutch, ZC/SI hybrid tranny, and wow, did it make a difference. Though many many people seem to do this and have zero problems and are happy as can be. -Underdrive pulley-Mopar LT headers and high flow cats-Port and polished throttle body-MSD ignition-CMR tune I'm going to do these mods first and then when there's nothing left to do myself, I'll take it for the heads and cam. Install your Trick Flow underdrive pulleys to the water pump and crankshaft dampner using the stock bolts, hand tight at this point. We test to see if an agency power lightweight underdrive crank pulley actually increases performance. My only motivation for posting this is to give a heads-up to all people considering doing this mod. com FREE DELIVERY possible on eligible purchases. my car is a manual 6 speed with all bolt ons and stock internals. MotoBlue GEN X UnderDrive Pulley Kits What's an underdrive pulley? An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. If you think about this for a moment, you'll see that the pitch diameter of a pulley depends not just on the pulley itself, but on the width of the belt. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. I also have underdrive pullies on my VW Corrado VR6--they were alot more expensive from Unorthodox Racing, but you also get the power steering pulley and a choice of colors (whoopie). i didn't put the alternator pulley on,the one i have is about the same size. i was looking to get a set of underdrive pulleys, not sure if i should do an alternator upgrade before then. ALL I DID WAS CHANGE THE PULLEYS BACK TO STOCK PULLEYS AND ADD A 160 thermastat. High Output Alternators built right in the USA. a Pulley is one of the oldest devices ever made, it is simply a part that either allows a rope to move in two directions very smoothly, or can be used in multiples to ease lifting loads, for instance someone with a set of pulleys can lift a large. I never noticed much difference in performance, but I did notice the low rpm charging problems. Voltage at night would get a little low until i took off again. 2 4 banger 5 speed. Warning: don't buy or install underdrive pulleys on your car until you watch this video! They show you which quality brands to go with and why low quality pulleys can cause problems with your Mustang (or any car for that matter). 1306-R07020030-AB Page 1 of 13 1-800-59-ROUSH Ford Mustang GT Underdrive Pulley Kit P/N: R07020012 Application: 2005-2010 Ford Mustang GT 4. RJC Underdrive Race Crank Pulley. So was it a good move for me to buy this pulley or should I have gone with a 7 in. 1L ( SRT8100235BMC ) New 25% underdrive balancer for 2005-2007 Jeep SRT8 incorporates a number of high quality features you won't find on any other aftermarket unit and makes up to 9 additional rear wheel horsepower and 10 ft-lbs of rear wheel torque over the stock crankshaft pulley. He said an underdrive pulley would cost about $30-$40 and get 20+ HP and low-end torque by putting less of a load on the engine. These pulleys help to reduce coolant temperatures, but if you have a problem it needs to be fixed properly. This part is designed to route the drive belt and keep it tight. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon. The pitch diameter of any pulley is measured at these fibers. Wiki User 12/27/2008. Even with light weight pulleys, they don't address the problem that the factory pulley also acts as a harmonic dampener. Each pulley is SFI approved as a balancer meaning it is a true balancer and an underdrive. I have an electric fan to install to help with the overheating problem. pros and cons of an underdrive pulley? what are the downsides to using an underdrive pulley? i've heard that getting an underdrive pulley will cause problems with the alternator and a bunch of other stuff. With my mustang I was running an UD crank pulley but with the stock alternator if the E fan kicked on it would not put out enough to properly run both the fuel pumps at idle so when the E fan turned on at idle it got pretty choppy. COSMO RACING PERFORMANCE LIGHTWEIGHT UNDERDRIVE PULLEY for HONDA. 4, powerbond make a underive pulley that still retains a full balancer and I have not heard of any problems with these ones, but not to say there has been no problems. Install your Trick Flow underdrive pulleys to the water pump and crankshaft dampner using the stock bolts, hand tight at this point. Normally, it takes work to get it over 180 degrees even with a thermostat. 9? or would they. This is a lightweight underdrive pulley kit that has been designed to help remove some rotational mass from your engine to improve the overall performance. I had a set of March underdrive pulleys on my 383 SBC. Harmonic Balancer/Underdrive Pulley, 1998-02 LS1 Camaro/Firebird w/Bolt, New 25% underdrive balancer for LS1 F-Bodies incorporates a number of high-quality features you won't find on any other aftermarket unit. Brothers Performance is not sponsored, affiliated, or otherwise connected in any way to any of the manufacturers named on our website or promotional materials. i have an electric fan,hid kit, 375w. Park idle and driving charging and cooling was never a issue. Buy products related to underdrive pulleys and see what customers say about underdrive pulleys on Amazon. The OBX underdrive pulley works great but it does slow down the accessories. My only motivation for posting this is to give a heads-up to all people considering doing this mod. Redlining your car is going to cause problems with UD's or not. The theory behind the power pulley is that a reduction in the speed of the accessory drive will minimize the parasitic losses that rob power from the. Find many great new & used options and get the best deals for Lightweight Underdrive Crank Pulley fit 04-08 Mazda RX8 1. 1306-R07020030-AB Page 1 of 13 1-800-59-ROUSH Ford Mustang GT Underdrive Pulley Kit P/N: R07020012 Application: 2005-2010 Ford Mustang GT 4. BBK underdrive crank pulley for 1993-1997 Camaro/Firebird LT1 is one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. The transmission speed sensor regulates miles per hour. RJC Underdrive Race Crank Pulley. If less power is needed to spin the pulley and accessories then more power is available to be sent to the transmission. 5"" race crank pulley and/or b) the kits that were available were all underdriven alternator/H2O. Steeda was the first to achieve SFI approval on our underdrive pulleys for all 4. no one has proved that it has been the underdrive pulley, untill there are FACTS i will leave mine on. The voltage issue was presant a little bit before the pulley swap, but not as much, maybe 13V at night and 14 during the day. As w3fq stated, you'll be taxing/slowing down the alternator, AC system, emissions, and water pump. My best pass was after I cracked the pulley (threw the belt) and the car got over 200 degrees. 93-01 Honda Prelude Light Weight Aluminum Crank Pulley H22 H22A1 H22A4 VTEC // PART # CP040 Underdrive Single Belt Crank Pulley Acura Integra Honda Civic Si CRV. BBK underdrive crank pulley for 1993-1997 Camaro/Firebird LT1 is one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. This pulley is yet another redesign of the famous MPx pulley that has been out since 2001. Our underdrive pulleys are the only pulleys engineered through our unique partnership in Ford's technology transfer program to have the proper torsional vibration dampening. I also have underdrive pullies on my VW Corrado VR6--they were alot more expensive from Unorthodox Racing, but you also get the power steering pulley and a choice of colors (whoopie). One of the main reasons I haven't done this is because I've heard it puts a bigger strain on your alternator and currently when I drive at night with my headlights on, the battery gauge goes down when I am idling. Factory balancers will do it too, but you have a warranty to cover you in case of that. First off a few disclaimers: This page deals ONLY with the 3000GT/Stealth cars and Unorthodox Racing's under drive pulleys. And the title of the thread is "underdrive pulley problems". Hi,I'm considering installing the SLP underdrive pulley on my DD,Has anyone had issues with this,dead battery,overheating,poor a/c,etc or is it just not worth it on a DD. So i ordered a pair of the underdrive pulleys ffrom summit but i dont know what kind of belt to put on her because the cam shaft pulley is smaller than the stock pulley and the alternator pulley is a little bigger. Are we to assume that you're using the LC Engineering underdrive pulley? Because from your post it sounds like you're using the stock pulley. It adds something to the engine compartment and I am impressed after running them for about 2 days ha. due to i dont have a stereo or anything crazy electrical i decided to go with the pulley. The damper will be fitted at the front of the engine (opposite the clutch or transmission) just beyond the cover of the timing chain, gears, or belt, and behind the accessory drive pulley (which may carry one or more V, serpentine, or cogged belts. 1990-2005. Carefully tighten the crank bolt until you can feel the still warm crank pulley being pulled onto the crank snout. Not worth it for 8hp ( at best ) IMO. I can hear a change in tone at 3200 on my XC and the instant mpg reading starts to drop. At the bottom in fine print under reviews it states the part after running one for a bout a year or so will warp your crank shaft. Add To Cart. An underdrive damper reduces the accessory pulley rpm, which can lead to moderated charging system output voltage, somewhat higher engine temp at low speed rpm, and less HVAC cooling. I'd only ever consider an under drive for a high rpm engine, that sees high. 6 if you change the water pump pulley and alternator to a ribbed belt. Powerbond 25% Underdrive Pulley Installed on 2009. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM. Specifically, his underdrive/crankshaft pulley is flopping around like all that's holding it in place is the opposing tension from the alternator/power steering & A/C belts!. 4L DOHC VVT V8 Posted on July 6, 2011 by bwnunnally The Cadillac STS-V (2006-2009) uses the 4. If I keep the same alternator pulley of 60mm - it will have a ratio of 1. We give priority to phone calls and answer them as quickly as possible, please call us if you have an issue that needs to be resolved immediately. By changing the size of just this pulley, all the other pulleys would effectively be underdriven. i will say this they will help the trucks less than the cars. I have the opportunity to straight up trade stock pulleys for some underdrives. Seeking for the perfect underdrive pulleys for your vehicle is not a problem. Some of the underrive pulleys available, use no apparant harmonic balancer weight which has been blamed for some of the problems and they are meant for 4. If you think about this for a moment, you'll see that the pitch diameter of a pulley depends not just on the pulley itself, but on the width of the belt. more of a "street" car. He said an underdrive pulley would cost about $30-$40 and get 20+ HP and low-end torque by putting less of a load on the engine. SOLD Very slightly-used (< 35 miles, one day of use) Unorthodox Racing lightweight underdrive crankshaft pulley for a B14 GA16DE. The only possible reprogramming for an underdrive pulley would be a raised idle so the alternator will charge at idle. Adding boost pressure to the LC3 4. A underdrive pulley is a very inexpesnive mod that increases power, makes the car rev faster, and is overall a good modification. Pros and cons about under drive pulleys Hey, I've been kicking around the idea of doing the pulley thing and i am still not sure what to do, Are they a good thing to put on or will it cause other components under the hood an early grave. Replacing a broken, cracked or worn out alternator pulley is not very difficult, and it's something you can do yourself in half an hour or so. Big tires and tough trails will make your power steering pump work hard and get incredibly hot and shorten the life of the fluid and pump. can provide alone. i also have a 3 core radiator with no cooling problems. One problem with this is that water pumps and alternators were not made to operate at these speeds. The end result is aprox 4 lbs reduction in weight directly on a crankshaft. i just read on eip's site that underdrive pulleys kill crank bearings? any body know of this to be true on vrt's? VWVortex. Easy horsepower for only a couple of hundred dollars - and you don't even have to crack the engine open for surgery! Wait a. I logged voltage tonight at WOT in 1st, 2nd and 3rd gear and the lowest it ever got was 13. This pulley is intended to work with any Porsche that has a stock pulley number of 996. CVF designs, manufacturers and sells premium Serpentine & V-Belt Kits along with Billet Aluminum Pulleys and Brackets for Ford, Chevy, Pontiac, Chrysler (Mopar), Cummins, Oldsmobile, AMC Jeep, Buick and more. The box the pulleys came in only said "crank Pulley long water pump". SuperchargersOnline : Idler & Tensioner Pulleys - Supercharger Systems Supercharger Head Units Supercharger Parts Rebuilding Services Intercoolers/Heat Exchangers Performance Parts SCOL Swag Supercharger and superchargers accessorries. A Crankshaft pulley is a combination of wheels in a block or blocks in a tackle, that increases the force being applied to the vehicle's engine. I bought an Unorthodox Racing R crank pulley and will use it on my upcoming build. Underdrive pulleys. also IF they are causing problems, they all seem to be asp pullies. Went with a Buell belt just because My stock belt is 13 years old but only has just over 6k on it. Even with light weight pulleys, they don't address the problem that the factory pulley also acts as a harmonic dampener. Over time the tighter bending could stress the structure of the belt and weaken it. I looked at all the pulleys and stuff attached to the engine and I cant work out which is the harmonic balancer and you have to have a pulley puller or something to remove the pulleys. I have 244,000 miles give or take on it but before then when I purchased it the guy I bought it from said that the engine has been rebuilt, but couldn't find the paperwork on it. Auto Parts Deal's catalogs feature high-quality, low-priced performance pulleys for any engine type. Re: Under Drive Pulleys. net Applicable to '90 - '97 1. Most kits include a new crankshaft, water pump and alternator pulley and are a direct bolt on designed for either street or track use. I welcome differing opinions and will post anyone comments if they request. Pulley definition is - a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights. The design of our underdrive crank pulleys eliminates the need for any torsional damping for two reasons. The Under Drive Pulley debate. Im not even sure why anyone would think a tune would do anything for a pulley. Underdrive pulleys are a great way to free up horsepower to improve your vehicle's performance. org, is the worlds largest automotive enthusiast group exclusively geared towards the General Motors GM J-car platform including the Chevrolet Cavalier, Pontiac Sunfire, Pontiac Sunbird, Pontiac J 2000, Oldsmobile Firenza, Buick SkyHawk and Cadillac Cimarron. The difference between 3k and 3400 is Huge for mpg. Ford F-150: Lightweight and Underdrive Pulley Reviews. 25% Underdrive pulleys, are they worth it? I use Powerbond, and never had a problemalthough it isnt underdrive. Turner Motorsport Power Pulley Kit - E36 325/M3, E34 525i (M50), MZ3 (S52) Underdrive Power Pulleys work to 'free up' horsepower. Factory balancers will do it too, but you have a warranty to cover you in case of that. 6L 3 Piece Accessory Underdrive Pulley Set with New Balancer Includes a NEW harmonic balancer/crank pulley, alternator, and water pump pulleys. The theory behind the power pulley is that a reduction in the speed of the accessory drive will minimize the parasitic losses that rob power from the. I ordered the water pump and crank pulley. Don't forget to scribe a TDC line on the crank pulley and smear some RTV between the pulley and crank bolt washer to prevent any oil leakage. 9L and I was thinking about getting one of these underdrive crank pulley's from ASPRacing. 302 Ford pulley problems Myvintageiron7512. This is the reason why I never liked the under drive pulley idea. The most common pulleys on GM, Ford and Daimlier/Chrysler vehicles are the 6-groove 2-7/16, 2-3/8 and 2-1/4 inch pulleys, by reducing the pulley size to 2" or 1-7/8" your alternator will start producing power sooner and produce more power cruising down the boulevard or on the highway. Harmonic Balancer/Underdrive Pulley, 1998-02 LS1 Camaro/Firebird w/Bolt, New 25% underdrive balancer for LS1 F-Bodies incorporates a number of high-quality features you won't find on any other aftermarket unit. Underdrive pulley VS. Can I use underdrive power pulleys? The use of underdrive pulleys for the crankshaft has become popular but it has the downside of slowing alternator RPM. I have an electric fan to install to help with the overheating problem. I have been running one for years on my ls1. I just wouldn't personally feel safe about it. Bought it brand-new from UR for my B13 GA16 under the assumption that it'd fit properly (a GA16 is a GA16, right?), but it doesn't. You can also use it on a "long nose" 1. I'm going to go ahead and replace the coolant pump/crank pulleys, but I'm having doubts about replacing the alternator pulley. Here, you are looking at the Go Fast Bits Underdrive Pulley Kit. Yes, some underdrive pulleys arent harmonically balanced to the engine vibration and crankputting an underdrive pulley that isnt balanced properly can lead to oilpump failure and other damage. businessman was. Kit includes: crank pulley only (original factory belts are used). If *anything* quirky happened with electronics I'd freak and assume the underdrive pulley is at fault. You may have to register before you can post: click the register link above to proceed. 6 motors not our 5. American Pulley has been manufacturing conveying equipment in the USA for over 35 years and maintain a large stock inventory at our Leeds, AL and Phoenix, AZ facilities. 0L V8 we can assure you that our problem-solving capabilities are genuine and accurate. How is it broken? We need more info here. ASP is the only company to release an underdrive pulley system for the V6 Mustang. As w3fq stated, you'll be taxing/slowing down the alternator, AC system, emissions, and water pump. Easy horsepower for only a couple of hundred dollars - and you don't even have to crack the engine open for surgery! Wait a. Ultra S Crank Pulleys Standard Belt Layout (Underdrive) Our most popular crank pulleys, the ones everyone is familiar with. If you're looking to make this change on your Mustang, order your new Mustang engine brackets & pulleys today from CJ Pony Parts. The underdrive pulley is lighter than your standard one and it has a little smaller diameter to save even more weight. Underdrive Pulley for Porsche 996/997/Boxster 986 Brand: RSS The RSS Lightweight Underdrive Pulley is made from 6061-T6 aluminum. 8L-V6 is made from aircraft quality aluminum alloy. 2 4 banger 5 speed. We sell the highest-quality serpentine systems, v-belt kits, pulleys, brackets and accessories for Pontiac V8 engines. Has anyone looked into underdrive pulleys for the 4. Most engines use one idler pulley, and one tensioner pulley, though some designs do use more than one idler. Any suggestions good or bad? I just don't want to do a simple mod that will cause massive problems for me later. its putting near 350 rwhp. Originally they were invented for race cars in the 1950s and 60s, whose engines had been modified and ran at higher RPMs for longer periods of time than the. 5" which is not the same length as the OEM belt, it's smaller. Q: What kind of problems can underdrive pulleys create? This will really depend on your car and the situations regarding how you drive the car and where you live. Pros and cons about under drive pulleys Hey, I've been kicking around the idea of doing the pulley thing and i am still not sure what to do, Are they a good thing to put on or will it cause other components under the hood an early grave. 3 it dropped me a tenth and it was the last thing i ever did to that motor. This underdrive pulley creates more power over the stock pulley by reducing overall weight, and size of the crank pulley. This 25% underdrive balancer for the 2005-2008 5. btw the underdrive pulleys which I use on my 85 Mustang are steel and they make a very noticable (11-15 HP) difference. Anyone here using aftermarket under-drive billet pulleys and if so did this cause over heating problems for you? I have a 1969 340, 11:1, 508 lift cam, Nicely worked J heads, making right at 400hp. Second, most underdrive pulley's don't dampen the crankshaft pulses as well as the stock damper and could lead to timing chain failure. Kit includes Underdrive Main Pulley, and two billet aluminum pulleys that eliminate the need to run a belt to the air pump. The transmission speed sensor regulates miles per hour. and cool the engine fine so I think you will probably be fine. The underdrive pulley, that is. T-6061 Aircraft Lightweight Billet Aluminum constructed & harden anodized. 25% Underdrive pulleys, are they worth it? I use Powerbond, and never had a problemalthough it isnt underdrive. Transmissions) Not Legal for Sale or Use on Pollution-Controlled Motor Vehicles Installation Instructions Before installing your ROUSH Performance Product(s), read through the. Want to really make a difference you need to go big like a cam or nitrous or boost but these are expensive and have their own set of problems. Tru-Trac allows the V-belt to ride deep in the belt groove for maximum belt contact. Dodge neon underdrive pulley? Answer. He did say that when you're idling, you are pulling partially off the battery, so it'd be a problem in regular bumper to bumper traffic. This will cause the alternator to have lower output at slow speeds. Turner Motorsport Power Pulley Kit - E36 325/M3, E34 525i (M50), MZ3 (S52) Underdrive Power Pulleys work to 'free up' horsepower. Have an underdrive pulley going in this week on my Vegas. The factory crank pulley is HUGE. No where on the box and even on there website does it state this is an underdrive pulley set up. Sean says it is a fairly common problem. RJC Underdrive Race Crank Pulley. 6L V8 engine and the a long water pump (bowed out face). Our underdrive pulleys are the only pulleys engineered through our unique partnership in Ford's technology transfer program to have the proper torsional vibration dampening. under drive pulleys could cause problems with the cooling and charging, etc my car would probably be fine with them though since it already has a 130a 3g, a big rad and an electric fan. You could feel it for sure. If I keep the same alternator pulley of 60mm - it will have a ratio of 1. Thoughts on underdrive pulley Was thinking, with my new track setup, I'm not too wild about cooking my power steering pump. Easy horsepower for only a couple of hundred dollars - and you don't even have to crack the engine open for surgery! Wait a. Left unattended, the problem that causes a pulley squeal will likely become worse and lead to expensive alternator or engine repairs. i didn't put the alternator pulley on,the one i have is about the same size. For the most part you should be okay up north like you are as far as temperatures go, but as Tony said underdrive pulleys are not without their drawbacks. My question is will I have charging problems with this single pulley. I think this is beyond my expertise and best to pay a mechanic to do this for me. I have had the underdrive pulley and scoops from RPI for almost two years now and have had no problems. I've kept it on because it looks nice and causes no harm. but from my experience I ran NO AC, No PS, and a UR crank pulley and had Zero problems for about 1. Ford Mustang GT 2005-2014: How to Install Underdrive Pulleys. 1 kicker amp and a 600w. DETAILS: Includes crank pulley. 00 on e bay) and it made a difference that was very noticeable. It reduces the draw of the engine’s accessories by slowing them down. Underdrive pullies change the turning ratios between the pullies so your accessories such as your alternator, water pump, power steering pump, etc. Easy horsepower for only a couple of hundred dollars - and you don't even have to crack the engine open for surgery! Wait a. A smaller crank pulley will turn everything slower not faster. Set Includes Crank Pulley, Alternator Pulley, Water Pump Pulley and 2 drive belts are included. You'll have no problem finding a pulley at AutoZone since we carry the best alternator pulleys for cars and trucks. Install was simple and the pulleys seem nice and true. The pulley for that alternator does not have the one way clutch and the shaft diameter is larger. 05-10 mustang 4. A vehicle's crankshaft pulley may break or loosen, resulting in loss of power to the air conditioning. Maybe 2-3 each tops once you figure in friction losses. can u help me out with finding the right set for me please?. Don't give us negative or natural feedback ,it's not a wise choice to solve the problem. This is accomplished by slowing down the speed of these accessory drives that rob power from your engine. Ford Mustang GT 2005-2014: How to Install Underdrive Pulleys. tell me your tales!. The original prototype was a lightweight, smaller in diameter, solid aluminum pulley. no complaints. Over time the tighter bending could stress the structure of the belt and weaken it. Underdrive Pulley for 90-96 Nissan 300ZX Z32 3. i have the 130 amp alternator and have no chargeing problems. Our SR pulleys are also larger than the competition's pulleys so the fan belts have a larger. 4L supercharged Northstar engine, making 469 hp and 439 ft-lb of torque. The pitch diameter of any pulley is measured at these fibers. Remove the bolts from the water pump and crank pulleys and remove the stock pulleys. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM. i would do a tune, exhaust, headers, high flow cats, intake, cam, or heads befor i did a pulley oh yeah and if i was to mess with all the pulleys i would go with a underdrive pulley, overdrive alternator pulley, and electric water pump to keep everything charged and cool. Maybe 2-3 each tops once you figure in friction losses. Have an underdrive pulley going in this week on my Vegas. I've kept it on because it looks nice and causes no harm. 4L incorporates a number of high quality features you won't find on any other aftermarket unit and makes up to 9 additional rear wheel horsepower and 10 ft-lbs of rear wheel torque over the stock crankshaft pulley. I should be able to break 12s though with just the mods above. I am not going to go into details, but it an undampened crank pulley will eventually lead to serious problems. Loosen belt tensioner (1 x 12mm) on the power steering pump, then loosen the bolt slightly on the power steering pump mount ( 4. Remove the alternator mounting bolts and lift the alternator out of the cradle to access the pulley. Most kits include a new crankshaft, water pump and alternator pulley and are a direct bolt on designed for either street or track use. We"re thinking about installing an Unorthodox Underdrive Pulley in our 2006 G35 Coupe to address a lag/delay experienced upon accelerating from a quick stop at a stop sign and sometimes when easing off the gas pedal when traveling on a winding road. Unlike the pulleys you get for a 5. BBK Aluminum Under drive Crank Pulley for Ford Mustang 3. SLP Underdrive Pulley,worth it? This is a discussion on SLP Underdrive Pulley,worth it? within the External Engine forums, part of the LSx Technical Help Section category; I'm ordering a cam/oil pump/double roller timing set. That means: - Less engine coolant per minute being circulated, which is problem at idle in an SSR, as SSRs run hot to begin with - Less power putput from the alternator, which is is a problem if you like to run a good sound system and headlights and air conditioning at the same time. Underdrive Pulleys for TDI\'s - would it work? Don,t forget that the smaller the pulley is the tighter the bend the belt has to make to go around it. One of the simplest and most effective solutions is to install a smaller crankshaft pulley known as an under-drive pulley, because it under-drives the secondary systems (A/C, Alternator and Power Steering). Direct bolt on part in replacing with stock pulley; different size belt(s) will be needed in order to complete the installation. Some have claimed that the Unorthodox UDP eliminates some non-existent “rubber ring” on the stock pulley. Redlining your car is going to cause problems with UD's or not. ) In older vehicles the pulley and damper were separate units that were bolted together. com FREE DELIVERY possible on eligible purchases. He said an underdrive pulley would cost about $30-$40 and get 20+ HP and low-end torque by putting less of a load on the engine. I would be very careful with putting on a underdrive pulley. 2 4 banger 5 speed. I should be able to break 12s though with just the mods above. An underdrive pulley refers to a crankshaft or accessory pulley (a/c, alternator, power steering, water pump, etc. 6L 3-Valve (w / Man. Install your Trick Flow underdrive pulleys to the water pump and crankshaft dampner using the stock bolts, hand tight at this point. I have the underdrive pulley and did have my truck on a dyno before and after. Any accessory that spins from the main drive belt is using up power. The underdrive crank pulley is 95mm in diameter.