Buddy Stewert

What should the boost go up to on a stock 1993, 5.9 with a 5speed.
I'm seeing 19 PSI most in my empty truck.
Is that right.

dieselJon

Yep. Between 16-19 on a stock IC'd truck that is not leaking.

Jklawinsky

Sounds spot on.

Buddy Stewert

Ok Great Thanks.
Going to do some up grades wanted to have a base line to go from.
To start with
4 inch exhaust, 16mm housing.

bobva

16mm is not much if any improvement on a 93 which has a 18.5 housing.
16mm on a 92 which is a 22mm housing will be a improvement

4 inch full exhaust is also not much if not a loss with the 16 18.5 or 22mm housings.

The exhaust flows out of the housing to fast ( no pressure ) to keep the compressor side spinning = lag.

Leave the 3" down pipe then open it to 4'' if needed.

dieselJon

No pressure is good. All the exhaust goes past the vanes and spins it regardless.

Buddy Stewert

Picked up 4 LB of boost with the new 4" Exhaust.

JQmile

Crazy! Google "Project Rust bucket"...I made 301rwhp with mostly stock stuff.