piston dish, compression ratio, and a thump stick

[Ironwolf]

I'm looking to up the compression ratio and change out to a comp cam k-kit. Do I need to change the computer for this? Does anybody have any experience with this? Thanks.

[Eagle]

It's academic, since there's nothing you can change. There's no "high performance" version of the Renix ECU, and there's no chip for the Renix ECU. What might happen is that you'll have to upgrade to newer injectors to increase the flow at wide open throttle.

 

Why do you want to INCREASE the compression? For the 4.0L it's not exactly low. Most of us leave it stock or try to lower it to reduce pre-ignition.