LLY: Garrett 4094R turbo Issues

[Bill H]

Ok I've just done quite a bit of mods to an LLY and installed a 4094R Garrett turbo and I havent been able to get more than 30 psi of boost under WOT .
Ive been told by my PPE tech that I need to bump up to level 6,7,8 or 9 to get the boost up does any one have any thoughts here on what my boost should be ? I was thinking at least 40 to 43 psi under wot...

 

[super diesel]

Depends on the fuel program your running. Also you may need to do a I/C pressure check (plug it off after the turbo and before the motor intake and pressurize it to about 60-70psi) to find if it is leaking or not. You should hear it if its a lot of leaking though.

 

[Duramax racer 8]

Did you check for boost leaks is the egr blocked?
How's the truck feel could the gauge be off? Maybe boost codes?
It's time to get efi live and it tuned from ATP ,mcrat ,bobo,moonshine.
Just a few to consider.

 

[Dirtymaxx03]

under WOT how much black smoke do you see? is it a slight haze or is it bowing a bunch of black smoke?

 

[Bill H]

Medium to heavy black smoke.

 

[Bill H]

Yes i agree I am planning on EFI in spring time.

 

[Dirtymaxx03]

Medium to heavy black smoke.

if it seems like its smoking more than it was before the turbo, then you have a leak somewhere. do what the others said.

 

[paint94979]

FYI I made 35-38 psi with mine

 

[Dirtymaxx03]

FYI I made 35-38 psi with mine

im assuming he's using a PPE programmer for tuning so 30psi sounds about right doesnt it?

 

[Bill H]

Yes ppe program at level 5, 30 psi max boost under wot.

 

[Jscherbs]

Yes ppe program at level 5, 30 psi max boost under wot.

get efi asap and report back.

 

[Dirtymaxx03]

Yes ppe program at level 5, 30 psi max boost under wot.

i bet you dont have anything going wrong. 30 psi on that tuning sounds about right to me. try tune 7 or 8. i bet you make more boost

 

[Dan@PPE]

i bet you dont have anything going wrong. 30 psi on that tuning sounds about right to me. try tune 7 or 8. i bet you make more boost

X2:thumb:

 

[Bill H]

Low Boost

Ok Dan I,m on level 7 and the MAX boost is 30 PSI . No Leaks. What do you think???

 

[Dan@PPE]

try a larger tune.

How is the smoke output? what kind of boost gauge? Where is it referencing boost at?

The boost number is really not THAT important, Mass air flow is...

Level 10 should yeild a peak of 38-42 psi

 

[blk smoke lb7]

Man you got the goods to go run it on 10 i had 10 running most of the time before efi you just need some good rods bill, and after efi live your gonna love that

 

[DPC]

I see between 35-38 at 620RWHP.

 

[Dan@PPE]

That is about spot on for a 40/94R (they are good up to about 650rwhp, depending on the setup)

DPC at what pulse width and timing if you dont mind me asking? was this on stock injectors or larger ones?

 

[05_LLY]

Stock inj and dual pumps on efi tuning I seen between 35~38 with my old one.

 

[Dan@PPE]

what was your power output?