90volvo
Active member
- Joined
- May 27, 2017
- Location
- Eldorado Springs Mo.
Like it says, 90 plus ported manifold vs cutom header vs Na manifold with Jpipe. The engine package is ported head with oversize valves, RSI stage 3 camshaft, Klracing intake, big ebay intercooler, MS2, ID1000cc injectors, E85 fuel, Afr gauge, boost gauge. Engine has aftermarket h beam rods. turbo is open for advice. Goals- hit somewhere above 350 hp. Street driven with auto box with 3.73 gears. So, what you do?
My thoughts
90 plus would be easy and reliable. But might not flow better than the header.
Custom header with external wastegate- probably make more power and run more boost. But will be hard on plug wires and a pain to change plugs.
Jpipe with NA manifold.- The Jpipe I built has 1 3/4 pipes off the manfold and go to the turbo flange top front. I think it will be restrictive considering you have 4-1.5 runners in the manifold dumping into 2- 1.75 pipes. But maybe I am wrong. Lookiing back at header designs, exhuast gases expand when as they get cooler? But this set up is cheap, pretty easy to weld any kind of turbo flange on it. You can twin scroll it too.
I searched but never found anybody comparing all 3 options.
My thoughts
90 plus would be easy and reliable. But might not flow better than the header.
Custom header with external wastegate- probably make more power and run more boost. But will be hard on plug wires and a pain to change plugs.
Jpipe with NA manifold.- The Jpipe I built has 1 3/4 pipes off the manfold and go to the turbo flange top front. I think it will be restrictive considering you have 4-1.5 runners in the manifold dumping into 2- 1.75 pipes. But maybe I am wrong. Lookiing back at header designs, exhuast gases expand when as they get cooler? But this set up is cheap, pretty easy to weld any kind of turbo flange on it. You can twin scroll it too.
I searched but never found anybody comparing all 3 options.