3 bar help

[horsepowerguru427]

I dont do boosted applications much and was asked to help with this, so here i am. Mostly i stick with Gen3 but am familiar with Gen 4 stuff, just nothing boosted. He does have a set of ID1000's but has not done the install because he was unsure of how to do injector data. Im not worried about doing that, ive done injector swaps before, but at the moment he is worried about this limp mode issue. Codes list is attached, along with tune that i recieved and one that i made a few small changes. Also a log file, which i know is basically junk since he was not looging anything that matters. I have told him to take the tune i altered and data log with channels VE, DYNAIR, INJ pw, Inj duty cycle and any torque based channels as well, any other suggestions? Waiting on a new log from him at the moment. Will post when i recieve it. Anything else you guys wanna know, just ask and ill get the info.

This is the message i got from him.
The problem I am having is that if I go WOT, the engine goes into LIMP mode. There were a couple times it didn't go into LIMP and it pulled like a beast. Going 50%-75% throttle power seems good, but WOT is where it falls on it's face and goes LIMP. Using 3BAR MAP Sensor with Linear and Offset to 312.5 and -11.25 respectively.

After hitting LIMP, I get a bunch of codes. I can clear them and all is good until I hit WOT again. Attached is list of codes.

Engine Specifics
2007 Suburban 2500
6.0 - 240k miles
Single 78/76 turbo
3 BAR MAP - setting above
Stock injectors
Fuel Boost a Pump

[horsepowerguru427]

512g/s limit....got a new log from him.

[blindsquirrel]

What does "stock injectors" mean - they for sure aren't stock for any LY6, which is what the VIN has.

[horsepowerguru427]

Im not positive at the moment. I talked to him about the injectors and he asked for a reccomendation on something to use. Said hes saving his ID1000's for his other car. Ill find out though. I hate piecing shit together for people

Also i cant update OS to a 2 bar on this particular one...any reccomendations on that? a certain OS people switch to? im searching it now but havent found a solid answer i like yet.

[blindsquirrel]

Do you have flash tools other than HP Tuners?

Early LY6 has 29.4lb injectors, '09-up had 33.9lb, tune file has 50.0. Maybe it's not a LY6, or maybe it is and the data is wrong which means everything else is wrong which explains why it's able to hit 512g/s at 50% throttle.

[horsepowerguru427]

Ill ask him. He just sent a message back and said the changes i made stopped the limp mode issue. honestly i didnt even bother checking injector data because he said it was all stock stuff, rookie move on my part lol....im just as puzzled as you are lol...Ill get answers and let you know...

[blindsquirrel]

Only since you mentioned you usually stick with Gen 3s I'll be more explicit: You can't flash a different OS using only HP Tuners. The Gen 4 ECM has two hidden segments for the ETC that HPT doesn't read or write, even with a write-entire. You can only change to something different using GM SPS.

[horsepowerguru427]

Only since you mentioned you usually stick with Gen 3s I'll be more explicit: You can't flash a different OS using only HP Tuners. The Gen 4 ECM has two hidden segments for the ETC that HPT doesn't read or write, even with a write-entire. You can only change to something different using GM SPS.

aahhhh, i see. No, i did not know that. lol good thing i didnt attempt that lol No, i do not have any other flash hardware or software. BTW he said he bought the truck as is and has been trying to get it running. He was under the impression that everything was stock until i said something about it, or at least thats what he was told when he bought it. He is getting me the injector part number at the moment. Would you have a suggestion about what injectors to run on this application blindsquirrel, i mean, youre kinda the "injector guy" on here lol

[blindsquirrel]

That's like... 750 HP-capable combo, crankshaft? Straight gas or E85?

[edcmat-l1]

You know he's pegging the MAP right? Are you (or him) trying to make over 20 lbs. of boost? That's quite a lot on a stock lower end. The way it pegs it's like there's no waste gate or it's not working, not connected, etc.

[Alvin]

I've never seen anyone else mention this..

But GEN 4 2 bar OS's have a hard shut down at 255kpa. When you get to 255kpa the injector DC goes to 0%.

I have not tested the stock OS that high up but I'd imagine it likely has the same limit.

[Cringer]

I dont do boosted applications much and was asked to help with this, so here i am. Mostly i stick with Gen3 but am familiar with Gen 4 stuff, just nothing boosted. He does have a set of ID1000's but has not done the install because he was unsure of how to do injector data. Im not worried about doing that, ive done injector swaps before, but at the moment he is worried about this limp mode issue. Codes list is attached, along with tune that i recieved and one that i made a few small changes. Also a log file, which i know is basically junk since he was not looging anything that matters. I have told him to take the tune i altered and data log with channels VE, DYNAIR, INJ pw, Inj duty cycle and any torque based channels as well, any other suggestions? Waiting on a new log from him at the moment. Will post when i recieve it. Anything else you guys wanna know, just ask and ill get the info.

This is the message i got from him.
The problem I am having is that if I go WOT, the engine goes into LIMP mode. There were a couple times it didn't go into LIMP and it pulled like a beast. Going 50%-75% throttle power seems good, but WOT is where it falls on it's face and goes LIMP. Using 3BAR MAP Sensor with Linear and Offset to 312.5 and -11.25 respectively.

After hitting LIMP, I get a bunch of codes. I can clear them and all is good until I hit WOT again. Attached is list of codes.

Engine Specifics
2007 Suburban 2500
6.0 - 240k miles
Single 78/76 turbo
3 BAR MAP - setting above
Stock injectors
Fuel Boost a Pump

The limp mode should be "fixed" in the "3.6.24 - 3BAR MAP Tune 2.hpt" tune you posted since the airflow correlation enable RPM ([ECM] 4042) has been effectively disabled by raising it to 8,000 rpms.

[edcmat-l1]

I'd be more worried about keeping the heads on it at 20+ PSI LOL

Quick story. I was helping a local shop tune a Silverado they put an On3 turbo kit on. It was pegging the MAP. Those systems are known for the waste gates being too small. I told them they needed a larger WG. The guy doing the work on the car kept test driving it and sending me data logs of it pegging the MAP and he just kept his foot in it. I told him to stop before he hurt it. A week later he's telling me he's replacing the heater core because it has a huge leak all of a sudden LOL. Then he asks me if there's freeze plugs in the ends of the heads LOL. Yeah he lifted the heads so bad it burst the heater core and blew freeze plugs out of it LOL I couldn't help but laugh right in his face.

[horsepowerguru427]

Blindsquirrel- I dont know what fuel hes running. Id assume 93 since E85 isnt very plentiful in this area. I guess i shouldve mentioned this is all remote tuning. Hes a state over from me, but i have not physically seen the truck.

EDCMAT-l1 - i was just asked to fix the limp mode issue. i said something about the boost level and he ignored the comment. He also ignored me about wiring his WB into the laptop as well, didnt want to spend the time and money to do it, so hes "eyeballing it". Hes a "software engineer", so i think he thinks hes smarter than everyone...mustve killed him to ask for help XD

Cringer - Yes, the changes i made did fix the limp mode issue. When i posted this thread he told me it didnt, however, at that point he never actually loaded the new tune i sent him lol

He says its running and hes happy for now. He also quit responding to messages, so....

Thanks for the input everyone. As always, i appreciate everyones opinions and thoughts!