Toy4Bob

Anyone changed from a stock 3.8 or 3.6 pulley to a 3.4? And have any numbers of rwhp increase?

I just swapped out my supershaker stock pulley (3.86 I think) to a 3.4, added a KB BAP, Brisk plugs, and of course a Brenspeed updated tune.

What would you expect for gains? Seat of the pants, not sure I noticed a thing....maybe a little more pull. I gotta get this thing on a dyno, but never did get a baseline of the stock shaker...

rcj2000

from a 3.6 to a 3.4 is only about 1.5 psi and should be about a 15rwhp increase....

Toy4Bob

sooo, roughly maybe could double that going from 3.8 to 3.4?

rcj2000

i dont belive they compound...when i was talking to the install shop and brenseed they said the

4.0 = 5-5.5 psi
3.8 = 6-6.5 psi
3.6 = 7-7.5psi
3.4 = 8-8.5 psi
3.2 = 9.5 psi

of course this will all be different depending on where you live and what mods you have. example an off road x pipe will lower your boost BUT make more HP due to the back pressure

Kurupt Kustoms

3.8 to a 3.4 i gained about 40 rwhp but the tune has to be there.....i now run the 3.0 pulley, 60 pound injectors, dual fuel pump 113mm maf and such.....currently 595 rwhp on 104 and 550 rwhp on 91 octain.......on the 3.8 pully i was only putting down like 375 rwhp... on the 3.4 i beleive i was around 450 rwhp....JDM has done all my tuning and i couldnt be happier...i also live at high altitude so i can get away with running my timing alot more advanced

S281 E

^+1 those are pretty good numbers.

Toy4Bob

Thanks for the feedback everyone. I will be very happy if I end up between 430 and 440 rwhp. Will see when I finally get dyno'd