mralbuquerque
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- Jan 22, 2009
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My 06 Viper has the following mods: 3.55 gears, k+n cai, and a sct tune. I was debating if it would be worth purchasing and underdrive crank pulley. Research on this forum indicated most people were saying it would offer zero to a few hp at most and was probably not worth the time or effort. With that assumption and a low budget I thought I would try it anyway. Besides it kind of looks pretty. (justification bling-bling). My results:
Baseline mods:
3.55 gears
SCT tuned (canned) by Todd A&C performance thanks.
k+n cai
441 hp and 468 ft lb's of torque.
Addition of UDP only with above mods: 451 hp and 484 ft lb's torque.
Installed the underdrive pulley purchased from Jon B. of partsrack.
I purchased the crank pulley and went to autozone and found a belt that was approximately 2 inch's shorter than stock. (I'll supply the part number if anyone is interested.)I took my car back to the dyno and they did three runs. The net result was a 10 hp gain and 16 ft lb of torque increase! All I can say is wow, that's bang for the buck!
For what its worth I looked at the corrections factor and the atmospheric conditions from the first time I dynoed and found the conditions were very similiar (1.19). Some of you guys will find my numbers low. However, I live at a mile high location and the numbers appear to read lower than what i've seen throughout this forum. Viper's with full exhausts on this dyno have only resulted in the high 450 to 460 range.
dynosheets to follow
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