Engine/Transmission (1994 - 1998) Boost Question

[Buck88]

I just recently put in a #6 plate and a boost elbow. When I'm WOT I'm only hitting like 26#'s. However, when the truck is in overdrive at like 60mph, I can tag 32#'s. Does it have to do with my torque converter? Thanks - Buck

 

[REFLOYD]

I would have to say that it has a lot to do with the stock converter. the reason you can get higher boost in overdrrive is because the TC clutch is locked.

 

[Matthug]

Diesel's react to load, higher the load the more boost. I have a manual trans, each gear higher puts more load on the engine. 3rd gear I might hit 30-32 PSI, 4th like 34-35, and 5th I hit 37 PSI. On a steep grade in 5th I'll hit 38 PSI.