joecutlass Posted June 3, 2011 Report Posted June 3, 2011 What are the advantages/disadvantages of a underdrive pulley? Is there a significant gain in power? Ive found a company in canada that makes them. And i cant find them anywhere else. Quote
Dark Ride Posted June 3, 2011 Report Posted June 3, 2011 Well, it slows the speed of your accessory belt, reducing their drag on the crankshaft. Probably 3 HP tops. Main disadvantage would be the alternator is spinning slower and therefore cannot charge as much without getting too hot. Quote
Schurkey Posted June 5, 2011 Report Posted June 5, 2011 Water pump spins slower, reduced cooling at idle and low speed. A/C compressor spins slower, might reduce efficiency of A/C system especially at idle and low speed. Overall...TOTAL WASTE OF TIME with virtually no upside. Quote
3.1cutlass Posted June 5, 2011 Report Posted June 5, 2011 Overall...TOTAL WASTE OF TIME with virtually no upside. Absolutely false... The motor revs much more quickly and the throttle response is much higher than stock. I have had mine for ~2 years without a single issue. Quote
19Cutlass94 Posted June 5, 2011 Report Posted June 5, 2011 The motor will rev more quickly, and FFP had dyno results of 8whp. However it has no damper... Quote
BXX Posted June 5, 2011 Report Posted June 5, 2011 The motor will rev more quickly, and FFP had dyno results of 8whp. However it has no damper... The 1mm thick hard rubber on our stock pulleys doesnt do shit for dampening other than accessory drive harmonics. Its not a harmonic balancer by any means. A 3800 is a much different story. And im yet to hear of anyone having cooling system or charging system issues with UDPs on our cars Shurkey. If anyone is really really concerned aboot the slight chance of having charging issues at low idle, then MRZ makes a smaller altenator pulley as well. Quote
19Cutlass94 Posted June 5, 2011 Report Posted June 5, 2011 Because a harmonic balancer and a damper are two different things... But im not getting into this arguement again for the 8 millionth time on this forum... Quote
jman093 Posted June 5, 2011 Report Posted June 5, 2011 Had an FFP UD on the GTP since I bought the car almost 60,000 miles ago. 0 problems with charging/cooling/ac at idle. Quote
joecutlass Posted June 13, 2011 Author Report Posted June 13, 2011 So would an 8hp gain be worth $135 or is there a better way to go about gaining hp? Quote
jman093 Posted June 13, 2011 Report Posted June 13, 2011 IMO they're worth the price a few extra ponies. Quote
Dark Ride Posted June 13, 2011 Report Posted June 13, 2011 Swapping on an underdrive pulley is about as easy as it gets, so if you looking for bolt-on hp go for it (may even get a slight increase in MPG as well). My charging note was mainly intended for if he planned to install a sound system, it would then IMO become a factor. Quote
Schurkey Posted June 13, 2011 Report Posted June 13, 2011 So would an 8hp gain be worth $135 or is there a better way to go about gaining hp? Probably get more than that by shutting off the A/C and defroster. Free. Quote
BXX Posted June 13, 2011 Report Posted June 13, 2011 Probably get more than that by shutting off the A/C and defroster. Free. And you not always being a cynical asshole would be priceless:thumbsup: Quote
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