What is better a low compression of 9.0.1 or a compression of 10.5.1? I was wondering because I was looking at som pistons and these are the compression numbers they have. From JE pistons. Im also thinking of F/I upgrade later on.

 

For FI, you'll want lower compression. NA; go with the higher.

 

Thanks for the info!

 

depends on application, tuning, and amount of boost you wanna run, as well as what octane of fuel you want to run daily. alot of people are building engines for boost with reasonably high compression, and many are still going the way of low compression and alot of boost. Search some more, there were a few good threads on this in the FI forum.

 

lower compression=bigger tuning window