couv3z Posted June 9, 2007 Share Posted June 9, 2007 looking at getting this for my Na supra is this the right kit?? or is the crank pull the same on all supra's? Unorthodox Racing Lightened Crank Pulley for 1993-98 Supra Part # UR 02121070x MK4 Unorthodox Racing lightened underdrive crank pulleys on average can provide gains of 5 to 12 HP and 4 to 8 lbs.-ft. on normally aspirated engines and 8 to 16 HP and 8 to 18 lbs.-ft. on forced induction engines. Power gains are obtained in two ways. First, and most important, is the weight loss. An average of 2.7 HP is gained from every pound lost off the crank shaft. 85% of our gains are from weight loss. The rest of the gains are from underdriving, which accounts for about 15% of the total gains. U.R. does not push underdriving for two main reasons. The main reason is to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for every day driving. Second, not much horsepower is gained from extreme underdriving. In most applications all of the underdriving is done with the crank pulley, not the accessory pulleys. This is done so maximum weight loss can be achieved at the crank where most of the horsepower gains are found. This pulley is available in silver (polished). MSRP $219.00 Your Price $189.00 or Boost Logic Crank Pulley for 1993-98 Supra - Aluminum Part # BL Crank Pulley MK4 The stock harmonic dampener cracks because the stock hub is made out of aluminum. Boost Logic fixed this problem by making the hub out of steel. This CNC'd unit, unlike the stock one, will NEVER crack. The outer pulley is made of lightweight aluminum. What's even better is that it is SFI approved, fully dampened, and is lighter than stock. The stock unit weighs in at 7.25lbs while this unit weighs 5.75lbs; a 20.68% reduction of rotating mass. The best part is that it also uses the STOCK belt while other SFI approved dampeners require a different belt. Steel Hub to prevent cracking like the stock aluminum hub Press Fit Hub to alleviate keyway gouging 20.68% weight reduction in rotating mass Inertia weight dampening SFI Approved Allows the use of the stock belt MSRP $429.00 Your Price $419.00 Quote Link to comment Share on other sites More sharing options...
couv3z Posted June 11, 2007 Author Share Posted June 11, 2007 can any body help? Quote Link to comment Share on other sites More sharing options...
MrRalphMan Posted June 11, 2007 Share Posted June 11, 2007 I think most people on here think stock is best for the Crank pully, as for me.. Haven't got a clue... Quote Link to comment Share on other sites More sharing options...
Joeatphr Posted June 11, 2007 Share Posted June 11, 2007 I have personally used both on a TT Supra and I can say that the BL is deffinantly worth the extra bit of change. Much better in quality and how its made. In my opinion for the best is BL but for a budget, UR is just fine to go with. Cheers, Joe looking at getting this for my Na supra is this the right kit?? or is the crank pull the same on all supra's? Unorthodox Racing Lightened Crank Pulley for 1993-98 Supra Part # UR 02121070x MK4 Unorthodox Racing lightened underdrive crank pulleys on average can provide gains of 5 to 12 HP and 4 to 8 lbs.-ft. on normally aspirated engines and 8 to 16 HP and 8 to 18 lbs.-ft. on forced induction engines. Power gains are obtained in two ways. First, and most important, is the weight loss. An average of 2.7 HP is gained from every pound lost off the crank shaft. 85% of our gains are from weight loss. The rest of the gains are from underdriving, which accounts for about 15% of the total gains. U.R. does not push underdriving for two main reasons. The main reason is to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for every day driving. Second, not much horsepower is gained from extreme underdriving. In most applications all of the underdriving is done with the crank pulley, not the accessory pulleys. This is done so maximum weight loss can be achieved at the crank where most of the horsepower gains are found. This pulley is available in silver (polished). MSRP $219.00 Your Price $189.00 or Boost Logic Crank Pulley for 1993-98 Supra - Aluminum Part # BL Crank Pulley MK4 The stock harmonic dampener cracks because the stock hub is made out of aluminum. Boost Logic fixed this problem by making the hub out of steel. This CNC'd unit, unlike the stock one, will NEVER crack. The outer pulley is made of lightweight aluminum. What's even better is that it is SFI approved, fully dampened, and is lighter than stock. The stock unit weighs in at 7.25lbs while this unit weighs 5.75lbs; a 20.68% reduction of rotating mass. The best part is that it also uses the STOCK belt while other SFI approved dampeners require a different belt. Steel Hub to prevent cracking like the stock aluminum hub Press Fit Hub to alleviate keyway gouging 20.68% weight reduction in rotating mass Inertia weight dampening SFI Approved Allows the use of the stock belt MSRP $429.00 Your Price $419.00 Quote Link to comment Share on other sites More sharing options...
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