broad question

[90siTuner]

what the highest comp. ratio that you can realistically get on pump gas (93)

thanks

 

[97hatch]

12.0-12.5 with a good tuner

 

[90siTuner]

true that

 

[97CTR]

yep 12.5 is good, but 13.0:1 has been done plenty of times. All depends on the tuner.