View Single Post
kenikh kenikh is offline
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,729
Quote:
Originally Posted by 911nut View Post
So, 320-340 hp out of 2.3 L at .8 bar?
I don't think you can get there that way.
Better up the boost to 1.1-1.2 bar. You might need to run a lower static compression ratio than 7.5:1.
As a data point, Porsche's first turbocharged racing engine had a 2.1 L displacement and ran 1.4 bar of boost, producing 490 hp @ 7600 rpm (source: Porsche 911 Story, 7th edition, pg. 269).
Sounds like an interesting project. Good luck.
You are totally right - I did some calcs and .8 Bar is closer to 305 HP w/ a reasonable efficient IC. Better to keep the half point, since the small displacement will need all the static CR it can get for off boost acceleration.

1 Bar gets ~350HP, based on said calcs. @ ~12 HP per psi (basic rule of thumb, all other variables remaining static), this basically jives out. Water/alcohol injection would support this on pump gas. Maybe a future project?

BTW, the 2.1 RSR still pencils out at 380 HP a .8 Bar, per my calcs...something is fishy.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930

Last edited by kenikh; 05-26-2009 at 08:57 PM..
Old 05-26-2009, 04:55 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)