6.7 Cummins rail plug problem

[coker6303]

Ya, wrong spot but I need clarification. Ultimately it is identical to the dmax with the high pressure rail and relief plug.

Here's what's going on, I installed an MP8 on my bro's 2011 Cummins and even with an AD165 it throws a low rail pressure code. Truck is stock with just the MP8. Could it be spiking psi past the shimmed relief setting and then dropping rail pressure? What's the typical case? I'm confusing myself by over thinking the situation...

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[J Spruill]

you can shim it just like a dmax and should solve the problem.

 

[coker6303]

I used all 3 shims like the kit called for on the Cummins. Going to just pull it off when his H&S black maxx gets here. 30kpsi isn't healthy

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08 LMM Duramax
Relentless Diesel trans
JoshH custom tuning
554hp 1014ft-lbs 7/30/2011

 

[JoshH]

Are you sure it's even leaking at the plug?

BTW, you don't have an relatives around here named Dustin, do you?

 

[coker6303]

I'm ASSuming its leaking at the plug. Not 100% sure

Nope, no relatives up there that I know of. May be related, but I don't know them. But if they are rich, I might be new found family!!

--------------------------------
08 LMM Duramax
Relentless Diesel trans
JoshH custom tuning
554hp 1014ft-lbs 7/30/2011

 

[J Spruill]

im running the h and s on my 6.7 and im happy with it...

 

[DIESELMAFIAPER.LB7]

The black maxx is 100 times better then a mp8 and it shouldn't be going over 28 ksi think thays hard on there injectors