3.5 psi is roughly 1 point. 11.5-12:1 is the limit (archive)

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3.5 psi is roughly 1 point. 11.5-12:1 is the limit (archive)

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Posted by Stepan on July 08, 2001 at 20:42:03:

In Reply to: What's the rule of thumb for how much boost I posted by can run on 10.1:1 compression? on July 08, 2001 at 20:39:47:

(posted from: 61.chicago-13-14rs.il.dial-access.att.net (12.84.5.61))

Ok...so about 7psi then. How much HP will I gain on a 3.0L at 10:1 and 7psi? 20:48 7/08/2001 (9)
- Nope. 7 psi in manifold. 8-9psi at the head unit. Stepan 20:51 7/08/2001 (8)
  - How come some Supra run 35psi? - 21:00 7/08/2001 (7)
    - Wha? What's the compression? (6:1 or something?) Ice and intercoolers? Stepan 21:02 7/08/2001 (6)
      - Re: Wha? What's the compression? (6:1 or something - 21:05 7/08/2001 (5)
        
        Yeah, until your pistons melt & rods fly out from your block. RevHigh 21:12 7/08/2001 (0)
        
        Yeah. Right. Audi I5 with 7.5:1 runs 22 psi. Get real! Stepan 21:12 7/08/2001 (0)
        
        330 runs 10.2:1 compression. What do you want to know? Stepan 21:10 7/08/2001 (2)
        
        I'm thinking of doing a twin turbo on my 330 - 22:20 7/08/2001 (1)
        
        Look, you need to know static CR. Cams are very Stepan 23:14 7/08/2001 (0)

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