Who s running underdrive pulley Any problems experienced particularly on track If this is your first visit, be sure to check out the FAQ by clicking the link above. 2L) Brand new from IPP & CCW, a 20% underdrive pulley. Subject: underdrive pulleys IP: Logged Message: where is a good place to buy underdrive pulleys for a 3. Smaller drive pulley = under drive, smaller driven pulleys = over drive, larger driven pulleys = under drive. Most of the available underdrive pullies bolt on in place of the damper and then you HAVE TO bolt the damper back on over them. Find out how to solve Mustang overheating problems. Chief among them are a pair of extra tall belt retention walls that eliminate the belt slippage issues endemic to other GTO balancers. But overall, I highly recommend this mod for those out there questioning it. If i have an underdrive pulley on my car would it cause my alt to charge less? It seems like it causes the belt to spin slower so could this hurt my voltage. Can not find an underdrive pulley for a v-belt style. Underdrive pulley VS. crankshaft pulley I looked at the water pump pulley, and it really looks fine. 22Re Underdrive pulley problems. BTW, when I put underdrive pulleys on my 1988 5. That’s why the pros and cons of an underdrive pulley must be taken under consideration if you are building or fixing your own vehicle or kit. Cams, Gears & Underdrive Pulleys. If you know any 3 values (Pulley sizes or RPM) and need to calculate the 4th, enter the 3 known values and hit Calculate to find the missing value. Oh and I will also be doing the fan delete while doing this. Please call us for the best pricing! 877-DRI-POWER (877-374-7693) Thanks, Derek:beerchug:. I ordered these from EAS - thank you EAS!! recieved them yesterday and got them installed today at Speedware in Redmond. Calculating a pulley’s rpm can be very handy when it comes to optimizing an accessory system or sorting out problems. 7L, but the only underdrive available (as far as I know) is over $500 (includes the ATI dampener). Underdrive pulleys increase engine output by reducing the draw of the engine's accessories by slowing them down and reducing the HP. 2011-2013 crankshaft underdrive pulley? Power Adders. com FREE DELIVERY possible on eligible purchases. I am planning on adding an underdrive pulley when I install my X-metal TB. drives (like water pump, power steering pump, alt) slower than your engine's crankshaft is turning This frees up a tad of power and keeps you from tossing belts off at higher RPM use. I have an underdrive pulley on my KA, I did notice a power difference. This SR Performance 3-Piece Polished Aluminum Underdrive Pulley Kit is designed for use on 1996 to 2001 GT Mustangs equipped with the SOHC 4. Top Products For Adding Horsepower and Torque Muddy trails, rocky worksites and plentiful payloads are no match for your F-250. Supports the Force, Work and Energy component of any science curriculum. Problems should only arise if your ride is using some high-powered components like racing-grade spark plugs or high-powered aftermarket stereo equipment, which will. charging wire kit from PA Performance, in order to save the stock wiring. It is of course smaller, and made out of Aluminum. ? Its not going to be a daily driver, not too much strip either. Often overlooked when basic bolt-ons are being considered, a three-piece set of underdrive pulleys is a quick and easy upgrade that frees up 10-15 horses at the feet of most '79-'10 V-8 'Stangs. The increased vibrations will always be there, the UD's will just let more of the vibrations resonate throughout the crank. I will take it in when I get where I'm going. A Bolt-On Pulley for the 2. 117 Harley Kit Engine Failure. V3 Vortech 8 rib pulley conversion & Supercharger Pulley Mustang (05-10) - 8 Rib Pulley Conversion & Supercharger Pulley Fits 2005 to 2009 Mustang GT If you have taken your Mustang to the level of needing this 8 rib upgrade congratulations!. 25 Years, Made in America!. How to identify key differences in Ford 3G, 4G and 6G Series alternators. any inputs?. The only potential downfall of an underdrive pulley vs stock diameter is that if you are running a lot of accessory power (ie a large system, etc) you may need that additional accessory power or need to upgrade your electrical components (ie better battery, alternator, etc). I welcome differing opinions and will post anyone comments if they request. my 2007 Dodge caliber has this pulley,its called the over running clutch pulley to prolong alternator life "YEA RIGHT" the pulley was chattering really bad sound like loud rattle nosie. 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). Underdrive is achieved by either making te crank/main (drive) pulley smaller or the accessory (driven) pulley larger than the original diameter pulleys. It's about the same size as the pulley that came with an AutoSpecialties underdrive pulley kit that was already installed on this vehicle, so there was no need to change it. Custom ECU Tuning! Call us today at: (985) 956-7009 And ask for Phil! "Hi, it's Roy from Canada, we finally got out to test the ecm, we rented the 1/2 mile banked track got down a base line time with the stock ecm at a respectable 25. Buy online, pick up in-store in 30 minutes. Direct bolt on part in replacing with stock pulley; different size belt(s) will be needed in order to complete the installation. Once installed you will notice a improvement in throttle response. So was it a good move for me to buy this pulley or should I have gone with a 7 in. The top supplying countries or regions are China, Taiwan, China, and Hong Kong S. com Forums forums, you must first register. lower alt output at idle? is that what the overdrive pulley is for the Alt? I had problems with an underdrive pulley set I put on a 5. Either out the back of the pulley cover, all over the inside of the pulley cover and/or imbeds itself onto the tooth surface of the belt itself. Underdrive/ light weight pulleys work by reducing rotational mass. "This 25% underdrive balancer for the 2011-2013 Dodge Charger/Challenger 6. ? Its not going to be a daily driver, not too much strip either. This is an ABSOLUTE must for anyone looking for BOLT-ON horsepower. In my never ending quest to change every part on my 2006 mazda 3i I came across a light weight/underdrive water pump pulley for a decent price on ebay. We are specialists in the manufacturer of unique and exclusive auto parts. 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. And the title of the thread is "underdrive pulley problems". Most of the available underdrive pullies bolt on in place of the damper and then you HAVE TO bolt the damper back on over them. Ive heard of people doing this and having no problems (I think drew was one, then again, how his car still even runs is a miracle after all he did to it) and Ive heard people having problems after doing the mod. Lightweight but NOT underdrive in the desert If I put an underdrive pulley on my AC would be even poorer than it is here in the HOTT 'Vegas summer. Introducing the new Version 3 MPx Underdrive Pulley for the 03-05 Neon SRT-4 & 01-10 PT Cruiser. The diodes go bad due to time, heat, or attempting to charge a completely dead battery using the alternator alone. It's an underdrive pulley kit for the 3. One problem with this is that water pumps and alternators were not made to operate at these speeds. 0-60 time (slight uphill, low rpm launch) was recorded at 9. PAF Active Member. It's about the same size as the pulley that came with an AutoSpecialties underdrive pulley kit that was already installed on this vehicle, so there was no need to change it. 8L turbo crank pulley sales sheet The Ultimate Performance and Design (UPD) CLA45 2. Talk to Candice or Lee there. Well at first when I installed it and started it. By continuing to use this site, you are consenting to our use of cookies. My problem is at idle; when I come to a stop at a light, the car quits running or barely runs. Any tricks that. Do you guys have problems Charging with AOD w/ Pulleys ? Well the Battery Light came on last nite. Thats really good info!! Thank you so much. The alternator that this author purchased came with a pulley slightly larger than the one found on the 75A model. com This feller installed one his Camaro and liked it. A larger pulley means less rotation, less drag. This is due to the pulley ratios on the OEM setups with heavy duty cooling, and can cause overheating issues for the unwary (like us). If an engine can run without the serpentine belt (no accessories), then I wouldn't think the pulley could affect timing. ) due to being 45% lighter than stock and by underdriving the crank shaft pulley, alternator and the water pump to keep down the chance of cavatation. If he said it backwards, and meant to say that the pulley is undersized, then a PT pulley would be useful. The point is you cannot just change one pulley to a different size. Official March Products. ofcourse i have a sound system in the car and that may have worsened the problem but after changing back the stock crank pulley my voltage improved significantly. The belt MAY not be an issue if the Eurosport pulley has a larger diameter than the UR crank pulley (They look the same diameter to me). Since underdrive pulleys slow down the operation of the water pump and alternator, particularly at idle, overheating (rather, above average heating due to a diminished coolant flow rate at idle) and low voltage can occur if your Mustang is already showing signs of these problems before installing underdrive pulleys. Removed the underdrive pulley and charging problems went away. ZABTECK PERFORMANCE ALSO SELLING PERFORMANCE DISTRIBUTORS AND AUSTEKK PRODUCTS Zabteck Performance specializes in V6 4. and the problems they cause. The other is a Lightweight Underdrive Performance pulley, this is a light weight, smaller diameter pulley and requires a belt size of 85. Welcome to "The coolest Dodge Magnum Forum on the Net!" Dodge Magnum Forums and Owners Club. APR’s Stage II Pulley ECU Upgrade makes the necessary engine management adjustments to handle the increased supercharger speeds, and in turn allows the engine to create more power. The stock supercharge pulley on the MINI Cooper S is a press fit onto the shaft. The car will not go one mile of an hour faster. Underdrive pulleys on vehicles have been around since the 1950s, commonly mounted on street performance hot rods, and much later on the Ford Mustang. The kits does this in a couple of ways, first the reduction of reciprocating mass the second to underdrive the accessories. I got to my brother's garage at about 8:45am. Well the whole point of an underdrive pully is to wind up faster by having a smaller radious. I ordered a OBX Underdrive Crank Pulley from ebay for my 1997 Integra GSR. A lightweight crank pulley that is under-driven to release more power in unsprung weight from the engine. Just call them and tell them you want an OVERDRIVE alt pulley for your truck. "Underdrive Pulley" Hello, I am thinking about putting on a "under drive pulley" on my 2012 V6 Accord Coupe, to gain a few more horsepower. We pride ourselves on delivering outstanding quality engineering and auto parts for leading clients across the world. Here, you are looking at the Go Fast Bits Underdrive Pulley Kit. 88) slowed down the. Our SR pulleys are also larger than the competition's pulleys so the fan belts have a larger. 0L Mustang GT I used to own. 4 MIVEC engine and the 2004+ Outlander with the 2. Ported & Polished Throttle Body RWHP Gain ~ 5-12 Average Cost - $100 - 500 SLP MTI FAST NX LPE Nick Williams Shaner Bo White Jantzer Throttle Body Coolent Bypass RWHP Gain ~ 2-3 Average Cost - $15 BMR* Oil Catch Can RWHP Gain ~ 2-6 Average Cost - $90 - 130 AMW* Underdrive Crank Pulley/Alternator Pulley RWHP Gain ~ 10-15 Average Cost - $180. First, it is both lighter and also underdriven, unlike some other sets that offer a lighter pulley wheel that is still of stock diameter. 5inch belt with a FR UDP) Thanks to TSmiley98. 01:1), while a set of March underdrive pulleys (PN 6090, $193. Underdrive pulleys or stock 5. This change yields a slight performance gain, but lowers the RPMs of all the belt attached appliances like the power steering pump, water pump, alternator. Stock harmonic balancer I would like to get into discussion on underdrive pulleys vs. Black finish. I've got no direct experience to share with you relating to the Vette underdrive pulley specifically, but I have been running the SLP underdrive pulley on my GMC Sierra's 5. Looking for. I drove it through the 19 degree mtns of colorado today and was worried the whole time about needing the 4wd and with that light on I'm not sure if it works. I have an underdrive pulley, but do they cause problems not being harmonic balancers?. • SFI race harmonic balancer included for unbeatable strength and durability. The GReddy Pulley Kit is designed to allow you to remove the air pump while retaining the factory main drive pulley. For example, if your small pulley is 6" diameter, and spins at 1000 RPM, and you need to find the second pulley size to spin it at 500 RPM, Enter Pulley1 Size 6, Pulley 1 RPM 1000, Pulley 2 RPM 500, and hit Calculate to find the second pulley diameter. Tru-Trac allows the V-belt to ride deep in the belt groove for maximum belt contact. They free up horsepower (With our SR Underdrive Power Pulleys our Project RX-8 gained 12 horsepower. Only a crank pulley, or a street kit should cause no problems. 0 MAF-EFI engine it ran considerably hotter and got a "Check Engine" light fault code because the smog pump wasn't turning over fast enough at idle. This pulley is yet another redesign of the famous MPx pulley that has been out for the since 2003. I am not going to go into details, but it an undampened crank pulley will eventually lead to serious problems. Problems should only arise if your ride is using some high-powered components like racing-grade spark plugs or high-powered aftermarket stereo equipment, which will. 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 was it a good move for me to buy this pulley or should I have gone with a 7 in. 0L Ford Mustang, Ford Explorer, Ford Explorer Sport Trac, and Ford Ranger performance parts and accessories that are not readily available to the public. '93 underdrive pulleys from BBK or Steeda I think. 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. 1 word related to undereducated: uneducated. This article will make it easy for you to decide which one you have. Department Of Boost Owners & Fans has 2,158 members. But some argue the introduction of C6 in 2005 did not truly represent a "new generation. Please enter a valid email address for yourself. net Applicable to '90 - '97 1. My thought was maybe that my crank pulley was not actually made for my accord (even though it fit perfectly). The J-Body Organization, j-body. I have the factory alternator on my car, I plan on installing an underdrive pulley on the crank. I posted this under Heel Toes T1R pulley thread, but I think everyone should have a read =D Lightened Crank Pulley In an internal combustion engine, what drives the alternator, water pump and other accessories is the crankshaft pulley, which spins as the crankshaft revolves. 5 and what sort of underdrive the pulley creates. Tensioner pulleys are mounted on this bolt, and idler pulleys are not. Just loosen the center nut for that and lower the idler pulley until you have enough slack to remove the belt. Yes it happened to me finally, 93k on my 06 SRT8. I know I repeat somethings a bit in the vid, but the different sections weren't made in the same order as they play in the video. I Installed An Underdrive Pulley On My 93 Lt1, And My Harmonic Balancer Has Started To Shake. My crank pulley is going bad and i plan on replacing it with a new underdrive pulley, i was wonder if anyone has had problems with this. Buy products related to underdrive pulleys and see what customers say about underdrive pulleys on Amazon. 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. Unless the lower pulley from the factory is truly an harmonic damper, you have nothing to worry about. Try a local auto parts store and buy the highest quality "crank pulley/ accessory belt" you can find for your car. I tossed them both in the trash and got 2 more from another speed shop,, No problems with the other one. I know that full underdrives gives a bit of power but youll often screw up the alternator s ability to charge right and. GenRight's vented power steering pulley has been skillfully CNC machined to have 4 fan blades into the center section of the pulley to continuously pushing cool air across the power steer pump. So, today finally came! And thank God for great weather. Underdrive Pulley & Now A/C Does Not Work at Idle Guys, I have a 2004 Z06 that the A/C was working fine on. Yes the small crank pulley will under drive everything. underdrive pulleys slow down your accesories. Again, there is a lot of internet hearsay about crank pulleys. Buy products related to underdrive pulleys and see what customers say about underdrive pulleys on Amazon. How is it broken? We need more info here. The OEM belt works well with the Underdrive Pulley we offer. 3 it dropped me a tenth and it was the last thing i ever did to that motor. 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. Cams, Gears & Underdrive Pulleys. Subject: Underdrive Crank Pulley IP: Logged Message: I have a 2000 Dakota with a 3. This is why my temps would get out of control in heavy traffic. I’m wondering if there’s any noticeable performance improvement. 25 Years, Made in America!. The J-Body Organization, j-body. - New belt sizes are required with this underdrive pulley. 2011-2013 crankshaft underdrive pulley? Power Adders. Set Includes Crank Pulley, Alternator Pulley, Water Pump Pulley and 2 drive belts are included. Took the old ARP bolt out and just cant get it off. I have an underdrive pulley on my KA, I did notice a power difference. The underdrive Saleen alternator pulley will only work with an alternator for an automatic transmission S197 car. They will not screw with your air conditioning or power steering. Even if alt charges, the WP and everything else won't see enough input shaft RPM for them to work right. i got the performance specialties 3 piece kit and it had the wayy smaller crank pulley, much bigger water pump pulley, and slightly larger alt pulley. On our cars the crank pulley is also the harmonic balancer and the water pump pulley is driven by the timing belt - cant mod those safely. If the part numbers or quantity of parts do not match, do not install them and call the dealer you purchased the parts from or call our tech line direct. 6L V8 engine and the a long water pump (bowed out face). Shifting harshness and shuddering issues related to the operation of the automatic transmission have been addressed by factory service bulletins. com FREE DELIVERY possible on eligible purchases. It was rough and noisy, like a bad bearing. Looking to get the most out of your Coyote? Look no further then our underdrive alternator pulley. and of course, an underdrive pulley will also under drive your supercharger. Lightweight Pulleys. 0L turbo and 1. I just purchased a set of Steeda underdrive pulleys for my Grand Marquis. One problem with this is that water pumps and alternators were not made to operate at these speeds. I did notice improvement though in how quick the rpm's rose. And will need a new belt. Complete Racing & Hot Rod Serpentine Engine Pulley Kits for Chevrolet, Ford, & Dodge. Both the power steering and sea pump pulley use mandrel mounting features that protect the pulley from undue shaft heat. These SR Performance Mustang Underdrive Pulleys installs quickly and easily in under 2 hours with no modifications required. Re: Underdrive Pulleys no you will not have any chanrging problems at all you might only gain a lil hp like maybe 5 the most like 10 if that. 5 Do you know of a place that makes them. i also have a friend that after adding the underdrive pulley had bearing failure 3 times and since he's removed the underdrive pulley the car has. Chevrolet Camaro Parts - Pulley System. 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. Underdrive is achieved by either making te crank/main (drive) pulley smaller or the accessory (driven) pulley larger than the original diameter pulleys. 1 revolution from pulley A = 1 revolution from pulley B. 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. Set Includes Crank Pulley, Alternator Pulley, Water Pump Pulley and 2 drive belts are included. Blue line thanks to ilarson007. Ford Mustang GT 2005-2014: How to Install Underdrive Pulleys. I try nasty things so you don't have to. I think I'm gonna do the underdrive next. Big difference with this pulley. Saving nearly 1. 0L pulley kit would work, but i talked to TurnerMotorSports about it and their engineer was certain that the pulley system is thoroughly different as there is no pulley-driven water pump. (mounting bolt length and belts). Motivated by problems with customer's cars resulting from the installation of power pulleys, I wish to explain the potential dangers of these products and address the damage they cause to engines. The result is improved engine response, faster revs, along with improved power and performance. I was wondering if any of you had problems with underdrive pulleys and what you did to fix it. I just pulled the underdrive pulley off my big block stroker. By changing the size of just this pulley, all the other pulleys would effectively be underdriven. looking for a few hp extra i found the threads about underdrive pulley. I blast the engine to 6,500 rpms and 11's in the qtr. We test to see if an agency power lightweight underdrive crank pulley actually increases performance. The underdrive pulley is lighter than your standard one and it has a little smaller diameter to save even more weight. Unless the lower pulley from the factory is truly an harmonic damper, you have nothing to worry about. The corollary is low output at idle. Underdrive pulleys are a great way to free up horsepower to improve your vehicle's performance. i got the performance specialties 3 piece kit and it had the wayy smaller crank pulley, much bigger water pump pulley, and slightly larger alt pulley. Using underdrive or power pulleys on a street application can cause this problem because the pulley ratio becomes less than the typical street ratio of 3:1. and the problems they cause. if you are doing a blower look into an overdrive pulley, it will help you run a larger supercharger pulley to help with air intake temps. The World's Largest Community of RX-7 Owners and Enthusiasts. LS1/LS6/LS2/LS3 Harmonic Balancer/Underdrive Pulley - slponline. It acted fine on the highway, but would start to overheat as soon as you got into any stop and go traffic. It works very well for me and I have had no problems for over a year now. "This 25% underdrive balancer for the 2011-2013 Dodge Charger/Challenger 6. The stock alternator pulley is designed for stop & go traffic, low rpms, & high loads caused by accessories and air conditioning. It's a 25% UDP. These pulley kits often replace the stock pulleys with larger and lighter ones to slow down the accessory or "underdrive" it. MPX Underdrive Pulley Kit for the 12+ Fiat 500 Abarth, 500T, 500X, 500L and '13-'16 Dodge Dart 1. Since underdrive pulleys slow down the operation of the water pump and alternator, particularly at idle, overheating (rather, above average heating due to a diminished coolant flow rate at idle) and low voltage can occur if your Mustang is already showing signs of these problems before installing underdrive pulleys. Thats what im looking for is better acceleration, dont care too much about top end lol I already have a speeding ticket on my record the cop hooked me up I was doing 130 in a 60 in my old integra before my dad blew the engine up while I was in korea but the cop gave me 79 just under a felony. Fan clutch looks fine. #3 Conveyor Belt Tracking Guide BASIC RULES I. to get some more easy power well less drag on the engine you could install a electric fan and go easy on the loud pedal and see what happens. The pulley for that alternator does not have the one way clutch and the shaft diameter is larger. a smaller diameter pulley will cause less rotations of a normal cycle. Basically, by making this pulley smaller, the crank will spin the belt slower which means the accessories will all be spun slower. : Chevelle Tech > Mechanical > Electrical & Wiring > Alternator Underdrive Pulley and Charging Issues?. Classic Industries offers a wide selection of Pulley System for your Chevrolet Camaro. For MOST people, you can run an underdrive pulley no problem. no charging problems whatsoever. The diodes go bad due to time, heat, or attempting to charge a completely dead battery using the alternator alone. Im not even sure why anyone would think a tune would do anything for a pulley. Pulley systems are made from two pulley wheels on a shaft with a belt joining them. matthewross1987 wrote: Yes, the noise occurs while the car is moving. so your alternator, water pump, and such will not be working correctly. This kit comes with the new harmonic balancer & a new water pump pulley. LS1/LS6/LS2/LS3 Harmonic Balancer/Underdrive Pulley - slponline. 0L Mustang. , a rod inevitably catostrophically fails due to extreme extension and compression forcesA harmonic balancer only dampens the harmonics caused by the torsional forces in a crankshaftIt may effect main bearing wear a bit. Check w/ Macperformance. Was thinking a bit more power and fuel economy,lol. 7 and was wondering if anyone has this installed. Wouldn't the 5. One problem with this is that water pumps and alternators were not made to operate at these speeds. My car is a base model so I don't have PS or AC, so the underdrive pulley was only slowing the alt and waterpump and that probably minimized its benefits. 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. For Nissan: - S13 Silvia/180sx. I used to have one on my old 4. yea underdrive pulley's are not good at all. Ford F-150: Lightweight and Underdrive Pulley Reviews. I sent the shop an email today to see if they make these for the 2. The oem crank pulley is dampened(has a harmonic balancer). If I keep the same alternator pulley of 60mm - it will have a ratio of 1. Underdrive Pulley thoughts Hey guys, I am considering installing an underdrive pulley kit, I have the Stillen one, and I am considering doing that with a custom NST O/D for the alternator or just buying a full NST kit. i havnt seen one person claim the powerbond has caused problems. Ford Focus Underdrive Pulley is made of super light weight 6061 aluminum, this pulley also allows the engine to rev more freely by replacing the heavy cast iron pulley it replaces. Now drop pulley A to 1" wide. The main purpose of the underdrive pulley is to lose as much weight off the crank pulley, and turn that extra lost weight into HP Gains. 9L and I was thinking about getting one of these underdrive crank pulley's from ASPRacing. An underdrive crank pully will under drive ALL acc. The diodes go bad due to time, heat, or attempting to charge a completely dead battery using the alternator alone. I did 4 or 5 different ways. While the measurements may not be exact because they were different dynos it does help. 73's and that along with the others made it fun! These mods are great for an otherwise basically stock engine. Typically underdrive pulleys are made to underdrive the main belt by 10 or 25% and only require a new main belt. Has anyone done the power pulley underdrive upgrade, specifically the UUC underdrive pullies? I was thinking about doing the upgrade and was looking for some opinions/comments on them. Vw belt pulley products are most popular in United States, Malaysia, and United Kingdom. The point is you cannot just change one pulley to a different size. My question is will I have charging problems with this single pulley. Check w/ the manufacturer,I believe an '03 will fit your '04 application. This can present some problems in removing it. light weight flywheel If this is your first visit, be sure to check out the FAQ by clicking the link above. pulley)so the engine doesn't have to work as hard to drive them,free's up a little hp. Note: If your email address requires someone to click a link before they can send you email, DO NOT REGISTER WITH IT as no one is here to click the link and you will never get your activation email!. I ran this for a few years with no problems. If an engine can run without the serpentine belt (no accessories), then I wouldn't think the pulley could affect timing. the only other pulley id recommend is the ek9 pulley because its balanced from honda. The KA is a little more rev friendly with the underdrive. 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. 4L supercharged Northstar engine, making 469 hp and 439 ft-lb of torque. I think part of my volt problem might be my idle, I don't know what the factory idle is, but when I put on the Celica TB and IM, I dropped the idle down to 600. This past summer I installed an LS6 in my car. EvoSport Underdrive Pulley Set Ground Control Air Box Screen AC Schnitzer Aluminum Hand Brake Air Filter Replacement Oil Level Sensor Replacement More Engine / Mechanical - BMW E46 DIY. So here's the deal, I bought a billet aluminum pulley kit for my 400 Cleveland not knowing that it was in underdrive kit. can u help me out with finding the right set for me please?. The OEM belt works well with the Underdrive Pulley we offer. Well the whole point of an underdrive pully is to wind up faster by having a smaller radious. 9 Dodge Magnum to your wish list. I trying to figure out if I want to put an underdrive pulley kit or a lightweight crankshaft pulley kit on my Jetta. Additionally, smaller but still serious problems can result from an undamped crankshaft. Lightweight pulleys are a great way to improve your engines efficiency. The World's Largest Community of RX-7 Owners and Enthusiasts. stock harmonic damper/balancer as I searched and did not find any post that explains the both parts in depth. 0L Mustang, ASP Underdrive Pulleys Steel Black 1994-1995 5. Welcome to "The coolest Dodge Magnum Forum on the Net!" Dodge Magnum Forums and Owners Club.