Hey guys. I just bought my rx7 and i'm new to all this rotary stuff. The car i bought has quite a few upgrades and is tuned using an apexi power fc. I'm looking into snow performance water/meth injection kit. What i'm wondering is....Is my car going to have to be re-tuned if I add this kit to my current setup? Or will it run fine/ the same? Any creditable advice is welcome, Thanks.

 

Yes, you need to adjust fuel/timing to take full advantage of AI. Especially if you're using methanol, since it is a fuel.