Toyota Celica Supra Forum banner

compression ratio increase

1148 Views 7 Replies 7 Participants Last post by  cheappower82
going from stock 8.8:1 to 10,10.5, or 11:1.

which one would be best? i know 11 offers more power but if i went that high would i be using octane booster? i'm thinking 10.5 like the new celicas run.

i want to do this by using a thinner headgasket and shaving the head.

anyone else done this for power? how did it turn out?

also thinking about a 3-angle valve-job and p&p while it's in there they'll only charge 100 more for it.
1 - 1 of 8 Posts
For the money to power ratio, not really worth it. The only way to make any real power with these engines is turboing, and its not really worth it to turbo a 5m. For price of a rebuild and turbo, it would be far more economical to get a 7mgte, then there is also more aftermarket for that motor.
As far as raising your compression, I dont think you are going to be able to raise it that much by shaving the head, you will need new pistons.
1 - 1 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.