If I had a compression ratio of about 10.4 or 10.5:1, could I use 91 octane or atleast 94 octane (only 2 higher octanes available in my area)?

 

im pretty sure you can cuz im about to put in either jdm itr or p30 pistons in my gsr and im gonna have higher comp than that and im gonna be runnin 92 with a tune

 

Yes. I am running 11.5:1 on 91 octane all day long. Tuned, of course.

 

Aprox 10.8:1 CR & I run 91 all the time. Like b19coupe said, tuned of course.

 

ok thanks alot guys that answers my question.
And as far as tuning I guess timing is the main one in order to prevent detonation with such high compression. But im using the stock cam so (z6 and y8 head/y8 cam) fuel shouldnt be affected.
BUt ill do my research on the tuning aspect of my build...thanks again