Upgraded Cummins First Gen 0-60! 

I don't have a good reference before swapping. After the swap, I get up to 32psi in 3rd and 35psi in 4th. That's with the waste gate locked shut. I hear that peak boost is not much different between the H1C and HX35W, but the HX35W spools up much easier. If you're looking for more power/boost, I'd check out a Borg Warner S300 or Holset HX40.

It slightly improved when driving slowly. When pushing hard, the MPG is definitely worse.

@@FormulaJake I got ya still in the 20s? I heard after the 1/8 bump it’s a little more efficient but u also had a bigger turbo so I was curious

The HX35W is pretty close to the original turbo and didn't seem to bother MPG much. Starting with the flatbed dually, I only saw about ~18mpg, usually around 75mph on the freeway and some city driving. With the timing bump and similar driving, the best I've seen is 20mpg. Not a huge difference but enough to notice.

@@FormulaJake well I’m glad how it turned out it’s awesome truck hope I get one soon thanks for answering my questions haha

Of course! Best of luck brotha