alright i am getting my car tuned in the upcoming weeks and have a few questions on boost levels so that i can order my final parts. i am planning on having a pump gas map made for boost at like 20 psi and having another map made for high octane unleaded gas i am thinking for sunoco 108 or something.. what is the safest boost levels i can run on like a mix of 1 gallon pump and 5 gallons of 108? if it is less than 25psi then i will stick with a jdm mr diverter valve, but if you think i will be running higher boost levels i might need to get like a forge diverter valve... thanks guys

 

Do 21psi on your daily 91oct tune, and go as high as you want for race gas. Whether it's a 5:1 ratio of 108/91, or straight 108, you can run as much boost as you want if you get custom tuned for it. Unless you plan to run the race gas map a lot, a JDM MR DV should be fine. If you do get a Forge, get the Forge RS for 25+, not the regular Evo15.

 

thanks for the help warrtalon i would think that the jdm mr would be fine for my autox needs dont you?

 

Certainly.