Typical turbo boost? - Chevy and GMC Duramax Diesel Forum
07.5-2010 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 12-24-2012, 10:39 PM   eBay Motors  #1 (permalink)
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Typical turbo boost?

What's typical turbo boost pressure? This is my first dmax and seems to produce far less boost than my cummins did, I did have an actual mechanical boost gauge on my cummins where as I'm getting my reading thru my edge on my dmax, it doesn't produce a lot of boost, probably like 12-15 psi when I get in to it. It's got lots of power so I assume the turbo is working fine, just curious
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Old 12-24-2012, 11:56 PM   eBay Motors  #2 (permalink)
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What year truck? My lb7 peaks at 27. Sounds like you may have a leak somewhere
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Old 12-24-2012, 11:59 PM   eBay Motors  #3 (permalink)
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2008, I've never actually put my foot to the floor, but my dodge definitely produced more going up the mountain
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Old 12-25-2012, 12:02 AM   eBay Motors  #4 (permalink)
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I can hit 15 easy just pulling out of a parking lot. I think my buddies lmm peaks at 35. Hit it and see what it makes.
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Old 12-25-2012, 12:03 AM   eBay Motors  #5 (permalink)
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smaller turbo probably(cummins). Really lay into it..
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Old 12-25-2012, 12:05 AM   eBay Motors  #6 (permalink)
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Will do guys thanks, hey dirty lets see a pic of those hostages!! I just ordered myself those in 22 as well
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Old 12-25-2012, 12:07 AM   eBay Motors  #7 (permalink)
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I've had 34 on my lmm with a stock turbo according to my edge insight.


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Old 12-25-2012, 04:39 PM   eBay Motors  #8 (permalink)
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Quote:
Originally Posted by projectblack View Post
2008, I've never actually put my foot to the floor, but my dodge definitely produced more going up the mountain
Dodges require more boost for the same power because the Cummins head doesn't flow as much air.
Check out the CFM differences between the Duramax and Cummins heads.....you'll see why they require more boost and generally smoke more. The old 12V Cummins heads are really pathetic.
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Old 12-25-2012, 05:19 PM   eBay Motors  #9 (permalink)
 
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Do you have a boost fooler? I have one an the more you crank the knob the less it will read I'm running a mechanical guage now
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Old 12-25-2012, 05:34 PM   eBay Motors  #10 (permalink)
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Stock and my 90 horse tune my truck hits 25psi. 160 horse it will peak at 32psi.
Sounds like you may have a boost leak somewhere.
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