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03-11-2005 #1
10.3-1 compression with 10psi boost?????
My procharger is comming.. Ill have it on MONDAY..
I was going to pull the intake and heads and headers and install .080 head gaskets to drop the compression down to 9.3-1.. (aluminum pro 1 heads)
Doing this is a real PAIN..
What would the possiblities of running the high compression with the 10lbs of boost from the procharger.. and if so... what fuel would i have to run??
Or should i just suck it up and pull the heads..??Project JUST-N-SANE
84' Camaro Z-28, 355CID,9.0-1 compression, ATI procharger 9psi (over 650HP),T56 6 speed, 3.73 Motive gears! 11.70 at 122mph in the 1/4 while babying the throttle to keep the tires hooked ,with pump gas! (NOW INTERCOOLED)
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03-11-2005 #2KaBOOOOOOOOMMMMmm!!!!
Kevin.
69 Firebird "Eternity"
03-11-2005 #3Starting The Transformation- Join Date
- Dec 2004
- Location
- Greeley, Colorado
- Posts
- 485
on a fuel injected motor you will need to have a SERIOUSLY safe tune making sure you've got enough fuel in your cylinders to keep the air charge down as much as possible. I'd look into a methanal injection kit as well. you won't be able to run it on pump gas. If you run 104+ plus through it making sure you've got the collest intake charge as you can with a good tune with lots of fuel and low timing you should probably be ok.
Jason Mounce
1969 Firebird | 2008 Corvette Z06 | 2008 Mustang GT/CS
03-11-2005 #4Starting The Transformation- Join Date
- Aug 2004
- Posts
- 210
On gasoline you can forget it. Alcohol could be made to work if you could get enough of it into the engine.
03-12-2005 #5Registered User- Join Date
- Feb 2005
- Posts
- 13
10.3:1 @ 10psi on pump gas, NO WAY
9.3:1 @ 10psi on pump gas, Peachy
I'm running 9-10psi on my aluminum headed 3.8L V6 with 9.2:1 compression and the timing is fairly agressive but I feed it lots of fuel (about 11.5:1 A/F under boost).
( I have 20,000 miles on it and 100's of runs down the track with the supercharger and 91 octane)1970' Malibu Project car, soon to have 383/200R4
1996' Thunderbird 3.8L/4r70w/Vortech V1/274rwhp/299rwtq
03-13-2005 #6What if i use 92-93 octain pump gas and poor in a can of 104 octain boost each fill up?
Project JUST-N-SANE
84' Camaro Z-28, 355CID,9.0-1 compression, ATI procharger 9psi (over 650HP),T56 6 speed, 3.73 Motive gears! 11.70 at 122mph in the 1/4 while babying the throttle to keep the tires hooked ,with pump gas! (NOW INTERCOOLED)
03-13-2005 #7