Duramax Diesels Forum Truck of the Week
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Old 03-10-2018, 04:13 PM
Dragbear Dragbear is offline
Join Date: Aug 2013
Posts: 36
Default S371 to S475 conversion.

Hi my name is Rick Abare.
I have a LMM daily driver that i pull 2.5 workstok in.
I ran a S371/ 83/ .91 all last year with no issues. I wanted to upgrade to the S400s for this year and my son has a
S475 / 91 / .90 so I bought a S400 install kit from HSP and bolted it on.
What a PIG!!!! What a nightmare to drive!!
No power below 2500rpm just a lot of smoke. I have to run 4th gear 80mph to keep it above 2500 to get up any hills.
Wear am I going wrong??? This turbo came off my son's 5.9 Cummins and made 70psi of boost. He was putting 50' on me at the pulls!
My set up is:
Built bottom end 15.8 comp.
Alt fire cam.
150% injectors
Twin CP3s
Pro fab headers and up pipes
T4 pedestal
Thanks for any help!!
I am about to abort this s400 nightmare!!!
S&B intake, Fleece 63mm cheetah turbo, Exergy 60% over injectors, Industrial Injection 12mm 85%over CP3, Banks down pipe, Sinister intake tube & egr cooler delete, Diamond turbo down pipe, Cat-DPF delete, Black Cloud stack kit, Grand Rock 6" Aussie stacks, Drop in stack mufflers, Fass titanium 150, Ported fuel rail fitting, Pressure relief block off, EFI Live, Built Trans, Vigilante converter, Trany to transfer case brace, Traction bars, Drive shaft hoops, Eaton front e-locker, Cognito braces, Tie rod sleeves, Edge insight.
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