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post #11 of 25 (permalink) Old 11-08-2010, 05:14 PM Thread Starter
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Quote:
Originally Posted by BriteWhiteRam View Post
i would be careful with running too much boost, i was only running 30psi when my HG's took a dump, and its a 20+ hour job to replace them
Ouch yeah I am kinda worried about that. What tune were you running to get 30lbs? Does the pcm throw an overboost code with the boost increase valve? I was under the impression that it didn't. Would you recommend headstuds+gasket for 30? I might just have to run a lower setting on the ppe if she does 30.
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post #12 of 25 (permalink) Old 11-09-2010, 04:16 AM
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ok well this situation may be different, I have an LBZ, so i dont have a wastegated turbo, its a VGT instead, and i WAS running a tune of my own creation, i used a Duramaxtuner tune and added more fuel and timing i estimated at 400rwhp, as well as a turbo-brake script, however Im just running a 365rwhp tune now, no turbo brake

EFI can tune out any over boost codes, basically any code you want to eliminate it can

I dont know if the LB7's blow gaskets, but i would think that 30 is pushing the limits, I found out the hard way that gaskets go quite regularly on LBZ's, and they always go the same way, but the new gaskets i have are supposed to hold up quite well, and i was told that regular headbolts should be able to hold 40psi if torqued properly

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Last edited by BriteWhiteRam; 11-09-2010 at 04:19 AM.
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post #13 of 25 (permalink) Old 11-09-2010, 02:14 PM Thread Starter
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Originally Posted by BriteWhiteRam View Post
and i was told that regular headbolts should be able to hold 40psi if torqued properly
Okay well I might put in new gaskets and retorque mine before I have problems...the headstud kits I have seen have all been like $600+
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post #14 of 25 (permalink) Old 11-09-2010, 07:53 PM
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Originally Posted by Smokd2dmax View Post
Okay well I might put in new gaskets and retorque mine before I have problems...the headstud kits I have seen have all been like $600+
For the amount of effort it takes to do head gaskets on these trucks, if your going to pull the engine apart to replace the gaskets, do yourself the favor and get the stud kit. That way you wont have to do the job twice.

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post #15 of 25 (permalink) Old 11-09-2010, 09:52 PM Thread Starter
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Right on man. Is there anybody (reliably)running over 30psi in their lb7's?
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post #16 of 25 (permalink) Old 11-13-2010, 06:35 PM
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http://www.merchant-automotive.com/l...gasketkit.aspx

Thats the Merchant Automotive kit, probably the cheapest Kit out there and its $1031.95 With ARP studs

You CANNOT re-torque the stock head bolts, they are a TORQUE-TO-YEILD bolt, they actually stretch when they are torqued, once they have failed, or are removed they will no longer be any good, they are a one time use only bolt, and there are 32 of them

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post #17 of 25 (permalink) Old 11-15-2010, 01:32 PM Thread Starter
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Well I guess I better start saving for the stud kit before I put that boost increase valve in I'd rather be safe than blow a headgasket over a few extra psi.
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post #18 of 25 (permalink) Old 11-15-2010, 11:41 PM
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Quote:
Originally Posted by Smokd2dmax View Post
Right on man. Is there anybody (reliably)running over 30psi in their lb7's?
Not without studs...

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post #19 of 25 (permalink) Old 11-16-2010, 12:20 AM
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Eric Told me that 40psi is possible with stock bolts on an LBZ, as for an LB7 i dont know

Its more about cylinder pressures than boost pressure, besides lots of extra boost on a stock turbo really isnt gaining you anything, just lots of heat and a turbo running outside of its effective MAP

Aaron the Crazy Canuck
2006 Chevrolet Silverado LT 2500: LBZ - Allison, Greystone Metallic, 4x4,PPE airbox mod, missing muffler/cat, EFILive tuned by Nick at duramaxtuner, MA tie-rod sleeves and Grade C headgaskets
Totalled!! May 2nd 2008-2005 Dodge Ram 3500 laramie: Cummins auto, plain white, rebuilt tranny
1986 Mercury Capri - 5.0L, AOD, shorty headers, acell ignition, Holly street dominator intake, Holly 625 vacuum secondaries carb, Dual glass packs "my little yellow terror"

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post #20 of 25 (permalink) Old 07-10-2012, 06:39 AM
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Gentlemen not to sound like a complete noob, but is there a reference I can refer to in order to learn all the abrivations you folks Speke so fluently ? Thank you in advance


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