The Story Of A Cummins Suburban (Lots Of Pics)

[HemiChallenger71]

But you've added and intercooler and better flowing turbo now so your safe egt is actually a bit higher. If its not blowing black smoke your fine to take it to 1200-1300. The 14cm housing helps too.

Turning the full power screw up will add fuel at higher rpm/wot. Currently the wastegate is not used, if it was allowed to open you will lower backpressure and increase exhaust flow IF theres enough exhaust flow to open it and keep it open in the first place. Dont be afraid of boost either. 35-38 psi is pretty common for factory turbos and factory parts.

I run my ppump up to 1400 1500 regularly, but only for short jaunts, not sustained. The newer trucks will hit 1300+ all day long in factory form.