PSI question?

[Wannaberacer]

whats PSI to HP ratio?

like.. for every extra PSI what is that for additional HP?

[bn880]

You're going to have to settle for % increase in HP as it depends on your other mods. And the % increase also depends on the modifications you have.

To top it off I can't give you the numbers ATM. :p Because I don't have anything like that prepared, others might.

[Diabloed]

everyone says roughly 7-10hp per psi increase

[cordes]

I seem to recall 7HP/PSI increase on a stock TII motor. That is all but out the window once the big mods come though.

[GLHSKEN]

7-10 per psi depending on mods is a good rule of thumb.

[Wannaberacer]

thanks. i saw it in thedodgegarage.com once i think. and in the past week i think i have read EVERYTHING on there. and i have not fouidn it. thanks guys

[Tony Hanna]

What are we looking at to get to 10 hp per psi?
Bolt on mods, or are we grinding on ports at that point?

[GLHSKEN]

Well... SOMEONE is grinding ports and fabricating front mount stuff... If I ground anything my car would go slower...

[GLHSKEN]

We'll use Butch N's old GLHS as a base. Bone stock Exhaust and all, 12 psi to the wheels he made 140 or so hp...

Jump to clays. Stock stage 2 computer 2 1/2" exhaust 200whp

Jump to mine, open downpipe (stock 2 1/4) +20's 18 psi boost 107mph in the 1/4. rough but 250 whp 2600 lb car.

Same set-up but an open 3" downpipe and Rick d ported 2.5" Swing valve. 109.7mph. About 265hp.

[Dave]

I know I went from 14.5psi to 16psi in my T1 Spirit (front mount TII intercooler, Garrett, open cut out, COA, stock computer). It made a hell of a difference. I could then roast the tires in 1st gear at 30mph whereas before at 14.5psi I could only do it at around lower 20mph.

Never did any hard comparison numbers other than feel. I think with some "good" mods (garrett, good intercooler, no exhaust, and a good fuel/spark curve) 10hp per psi is obtainable.

We could gain a lot more power per psi if Chrysler was smart and put 2 cams in instead of 1! :banghead: