idlewildranch

what should the boost be on a 03 5.9 cummins engine, its all stock except a fass fuel system

madhat

Max will probably be around 30-35.

cdennyb

yep, mine too, until I turn up the tuner box then I can over-ride the wastegate along with it and get about 43# tops under full acceleration. (like when I raced that Mustang from stop light thru the on-ramp, and up to the freeway.) LoL

got_soot

On my old 04 when it was stock would only hit 24psi. I bought the ugraded boost elbow and was hitting 39psi.

papaduck

Mine is stock. Around 24psi max.

03RAMBUNCTIOUS

25 psi, until you change out the boost elbow and add more fuel.

idlewildranch

so what, size gauge should i get, i cant do all the mods i want to now buy over time id like to do some,so i dont want to have to change gauges out later when i have more boost,any suggestions

tryNto

For most trucks a 60 psi will be plenty, If you plan on going big HP & mods, you will want a 100 psi...

idlewildranch

thanx,i believe the 60 is the same price as the 30