Hey everyone,

I've been reading about this underdrive pulley replacement. On this website here they claim that the pulley will "free up" 16hp and 12tq that is lost by the stock pulley system. Does anyone have any experience with this, and does it work? Or is this just another ploy to make some money......

 

it will add a couple hp but that much i dont think so

 

I made a post a while back about this...and rygen told me that underdrive pulleys wont really show any gain in our cars.

 

srming tried it...no peak gains...i would like to see the dyno compared though

 

no gains because he already had the PHP alternator pulley. Dont use both or ull end up with a dead battery. With simlar gains the PHP alt pulley is bout half the price and 100x easier to do.

 

did he onl get like 3rwhp out of it?

 

we saw a 3 to 5 RWHP gain with that PHP Alt Pulley... adding the crank pulley saw no addtional gain, only a dead battery... Doug dyno'ed the crank pulley only and saw a 4 to 6RWHP gain... As Fazm mentioned the Alt pulley is a LOT EASIER to install than the crank... almost the same gain at 1/2 the price!