Duramax Diesels Forum Truck of the Week
  #1  
Old 03-10-2018, 04:13 PM
Dragbear Dragbear is offline
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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
Fass
Pro fab headers and up pipes
T4 pedestal
Thanks for any help!!
I am about to abort this s400 nightmare!!!
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  #2  
Old 03-10-2018, 04:31 PM
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torqued2dmax torqued2dmax is offline
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Auto or stick ? What tuning system ? What gears ? So are you not going to pull work stock anymore ? Someone with alot more knowledge than me might let us know if you need to change to a T6 pedestal ! Good luck!
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Old 03-10-2018, 04:35 PM
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What converter?
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Old 03-10-2018, 06:26 PM
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Did you change tuning for the maf sensor?
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Old 03-10-2018, 06:50 PM
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Quote:
Originally Posted by gmduramax View Post
Did you change tuning for the maf sensor?
I had this problem when I switched from a garrett 4094 to a 4202. It was a complete pig until the maf tables got changed
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Old 03-10-2018, 11:02 PM
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It's not as easy as people make it out to be... Trial and error...
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Old 03-11-2018, 05:15 AM
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If it actually is the 92mm turbine, it is the laziest turbine you could of chosen. The 3 common Borg warner turbines are 83/74, 87/80, & 96/88. They also made a 92/82 that flows less than the smaller wheels and also manages to be super lazy.
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Old 03-11-2018, 05:29 AM
Dragbear Dragbear is offline
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At this point the converter is out of the pitcher because I am on the road over 45mph and the converter is locked. If I can't get it to work work better here there is no reason to go any further.

I had issues with the mass air reading going to 0 a lot so Danville tuned the mass air out of the tuning. It reads 600 all the time now. It has been that way for 2 years and runs great.
I have tuning from Starlight also and he uses the mass air and it runs no better than Danvilles tune.
The mass air goes to 0 above 3000rpm. I have replaced it and it no longer goes to 0.

Still running stock gears with a built Allison Trany. I had to get the torque converter restalled for the S371 and could foot brake it to 2200rpm and 20psi of boost. With this S475 the best I can get is 1800 and 1psi of boost.

I am thinking that I need to get rid of the 91mm turbine and get an 83mm??
Thanks, Rick Abare
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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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Old 03-11-2018, 05:35 AM
Dragbear Dragbear is offline
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I didn't buy this turbo it is a spare from my son's dodge truck. It is a 2.5 pulling turbo from Tator. I just wanted to try it before I bought one.

I am still running 2.5 work stock in some places and 2.6 in others. Most places require you to have a stock turbo so i get forced into the 2.6 class a lot.
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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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Old 03-11-2018, 08:39 AM
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Converter is too tight.
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  #11  
Old 03-11-2018, 08:54 AM
Dragbear Dragbear is offline
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Like I said the converter is out of the problem when it is locked at 65mph.
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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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Old 03-11-2018, 09:37 AM
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Sounds like you already have all the answers. Good luck getting more boost out of the hole. Have a nice day.
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Old 03-11-2018, 09:42 AM
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Did he ask how to get more boost out of the hole?
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03 Chev CC SB ZF6-Gone
04 GMC CC SB SLT LLY
597/1096 Batmostocker-Gone

06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
Current Tow Rig-12 Ram 4500 Crew


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now Better'- PPL Lim Pro Stock 05 3500 Crew Cab 158" WB 2014 PPP 2.6 Champions
Thanks to Blackout Performance

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Old 03-11-2018, 10:05 AM
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DAVe3283 DAVe3283 is online now
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You need to play with your transmission tune. You keep saying the converter is locked missing what we are all implying: it shouldn't be.

My truck is tuned to unlock the converter as soon as it starts to lug. That lets the RPM come up so it gets some boost, then it locks again.

And it does sound like your converter is too tight too, if you can't build boost on the line. I was in basically your situation with my cam+turbo combo, and I solved it with a re-stall and tuning (both engine and transmission tunes).

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Old 03-11-2018, 11:12 AM
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Default S371 to S475 conversion.

dAVe3283 is correct. Convertor and tuning will fix it. Ran a few different s475ís and each one I had to adjust tuning every time, convertor restalled made a world of difference too. You donít want the convertor locked that low of speed with that turbo setup. These guys telling you answers, like Ne-max, more than likely have been through the same scenario and already have done the trial and error.
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