Make me very happy
Got my 3.2" Magnacharger pulley, going down from a 3.4". I'm hoping this will give me 1.5-2lbs more boost, putting me at 7.5-8lbs? (from 6-7lbs)

How much more hp would that give me?

Thanks BlownChevy!

 

Hard to say bro. I say 20 hp max. Just ask Rick what happened when I pullied down. IAT's went through the roof and we could hardly run any timing. However, I went from a 3.4 to a 3.0.

It will be a noticable difference, just not sure how much. High IAT's are going to be the limiting factor. I gained 10hp with 1 degree of timing on the dyno.

 

I am hoping that 8lbs will put me in that shaded area just below the point where IAT's climb. With the 6-7 lbs Rick said my IAT's were about 109* running around on the street at 84*.

 

i have ordered a 3.25 and nelson tune. only getting 14 deg timing wot on stock radix tune. hoping to get timing in low 20's with the tune
i'm hoping that if iat's are too high with 3.25, i can put my 3.4 back on and still get the benefit of the tune. i will talk to them tomorrow to finalize.
at 10hp per degree of timing i have alot to gain.

 

Unless you have meth or a super heat exchanger, you are not going to get 20+ of timing degrees with a 3.25 pulley. The most I could run when i had the 5.3 w/ a 3.25 pulley was 18 degrees. Then the IAT table had to be changed to pull timing out when temps increased, which happened fast.

I do think that you can run more than timing than 14 deg with the 3.25 pulley, just not in the low 20's.

Good luck bro! Be sure to post results.

 

Right now I'm at 19*. You think a .200" smaller pulley will affect IAT's that much?
Going to find out next week.

 

i'm hoping i can run the same tune with both pulleys. if iat's are too high with the 3.25 i'll put the 3.4 back on.
i'm going to do some logs tomorrow with a bud's autoenginuity scanner and
http://www.autoenginuity.com/
hopefully with be able to email logs to nelson before they ship my tune
i don't have a problem with a meth kit, i just like to keep things as simple as i can. actually the guy at nelson's said i would probably want meth with a 3.25.
we'll see how it goes. i have an otc scanner at work that can check everything except afr's so i keep an eye on things

there is a good thread in the tuning section on wot timing, not much over 20 on f/i with out meth.
you are probably correct

 

shouldn't be a problem to change the pulley back if temps are too high.

 

im running a 3.1 and temps got 150 before the meth/water...now they are 135 at wot with 7-8 psi....

 

how much timing are you getting?
m/o or dyno tune?