mocoflojo

Hi, I have a 98 gt 4.6L with PI Swap, so the CR is 10.5:1 aprox.
I want to change the Iron Block to one of Aluminium, in this change I have the chance to put a Piston's of 6.5cc (S197), this put mi CR in 12.0:1 aprox..

My question wich is the CR recommended to a DD car.

I use the car once at week but sometimes I travel with it and run on 1/4 mile.

Note: I use 95 octane

Thanks.

teej281

any compression is fine dd. just as long as you are ok running high octane gas or are ok with retarded timing on low octane. but sounds like you'll be ok with 95 octane. I didnt even know that existed. what brand is it? Please tell me you dont run octane booster to get that octane rating.

boduke0220

i plan to run high 11's compression wise.im gonna have a no timing 87 tune for school and a BA 93 tune for the weekends

teej281

E85 for weekends. You wont...no *****!

Jay-rod427

12:1 is getting a little high for easy street driveability. Always needing to find high octane fuel, hard starting. Anything is doable though just a matter of your own personal tolerance.

98redstang

you and your god damn e85 again... hahahaha

boduke0220

I would in a heartbeat if i could, no E85 around here yet. go figure considering i live in the middle of where the biggest farms in Nc are lol