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Old 09-10-2018, 09:31 AM   #26
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default

On pump most people will say to stay under 8.5, but on E85 people suggestion vary and higher CR seems to work quite well. Waiting to see how response feel on autocross event. If response is good, I might try higher CR on my next build, if not that great I'll get back to a 2.5. I'm experimenting over the years.

On a Cobb 20g turbo with a 2.5 a friend of mine was running 8.75 and got back to 8.2 on his latest rebuild. He loss almost 500rpm spool on the dyno, but he gained some power and was able to run more boost on pump (94 octane canadian fuel). It also makes the build safer, expecially if you have high IAT.
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