Duramax Diesels Forum Truck of the Week
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Old 07-16-2017, 12:39 PM
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Default More turbo threads I read the more confused I get

So was considering upgrading the turbo on my LMM. Main reason is to have lower EGT's while towing. A little info about me/my truck. Its a DD, I live at about 3000ft, on weekends haul from 5000-7000lbs, about once a month haul around 16k lbs. When I am hauling, a fair amount of it is at altitude, 3-7k feet. Added MPG's would be nice, but not really going to decide for me, I know most of that has to do with self control of my foot...

I am looking to retain close to stock like spoolup, and close to stock turbo braking. Something that will be stock bottom end friendly (I know a good amount of this will be how the tuners gets it setup), currently have stock sticks/CP3, though I eventually am looking at upgrading to 40 over injectors to try and keep drive pressure down. Reliability is a must.

I am considering a S475 over stock, down side to me is all the plumbing, oil temps and potential headache if I ever had to do emissions testing.

Also have been doing a ton of reading about the Danville BMW GT3794VA Stg2, Fleece 63 Cheetah and HTT Promax 64. Also saw SDP has a GT3794 BatmoWheel 65mm that they advertise as stock like spoolup, but haven't found any reviews of it online.

I am sort of leaning towards a single currently for the reasons of, if I ever have to deal with emissions testing, it would be easier than removing a twin setup. Not to mention with my OEM turbo having almost 200k on it, with my luck if I twinned over it it would crap out, then I would be shelling out another 2k to replace it.

Thoughts and/or advice?
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Old 07-16-2017, 12:42 PM
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Is your trans built
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Old 07-16-2017, 12:43 PM
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Quote:
Originally Posted by blue09dmaxx View Post
Is your trans built
Will be in 2 months.


One thing I forgot to mention, I can tolerate some whistle, but dont want the thing so loud that I get a headache while on the highway.
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Old 07-16-2017, 01:34 PM
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S475/ over stock
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Old 07-16-2017, 01:38 PM
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I'll second the s475/stock. And I would keep the factory size injectors if your looking for mpg.
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Old 07-16-2017, 02:04 PM
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I'll third it!

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Old 07-16-2017, 02:42 PM
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Compounds would be ideal. I have the Danville 3794 and tow commercially with it. Generally pulling 15-25k. It works great. I did a 3" y bridge and down pipe at the same time. Egts dropped about 100 iirc


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Old 07-16-2017, 02:43 PM
kowclub173 kowclub173 is offline
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Honestly though if you just want lower egts I would keep the stock turbo and get a set of pro flow manifolds and up pipes. Cheaper and likely lower temps.


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Old 07-16-2017, 02:54 PM
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Quote:
Originally Posted by kowclub173 View Post
Compounds would be ideal. I have the Danville 3794 and tow commercially with it. Generally pulling 15-25k. It works great. I did a 3" y bridge and down pipe at the same time. Egts dropped about 100 iirc


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I was planning on doing manifolds and up pipes when I did the turbo...

Why did you decide to go with the Danville 3794 instead of twinning?
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Old 07-16-2017, 02:55 PM
kowclub173 kowclub173 is offline
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Quote:
Originally Posted by novaman64 View Post
I was planning on doing manifolds and up pipes when I did the turbo...



Why did you decide to go with the Danville 3794 instead of twinning?


Only reason I upgraded was my stock turbo had sticky vanes. Compound kit and new valley charger was way out of the budget.


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Old 07-16-2017, 04:05 PM
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Your coworkers at Dmax Store wont give you any advice?

I would go 475/stocker myself.
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Old 07-16-2017, 04:37 PM
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Quote:
Originally Posted by TheBac View Post
Your coworkers at Dmax Store wont give you any advice?

I would go 475/stocker myself.


X2. Stock turbo with a helper is an awesome setup all around.


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Old 07-16-2017, 10:36 PM
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Quote:
Originally Posted by TheBac View Post
Your coworkers at Dmax Store wont give you any advice?

I would go 475/stocker myself.
They did, but its nice to hear from other people as well.
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Old 07-17-2017, 03:56 AM
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Twin it. LMM's get wierd with a single charger...
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Old 07-17-2017, 05:36 AM
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Quote:
Originally Posted by kowclub173 View Post
Honestly though if you just want lower egts I would keep the stock turbo and get a set of pro flow manifolds and up pipes. Cheaper and likely lower temps.


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They don't lower overall temps one bit.
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