I just wanted some input from you guys about where Im going wrong. After installing my STS turbo I had a lot of little issues, with bad parts and tuning. After working with Allen I was able to get a tune that was really close. The truck ran good and pulled real hard to redline. Unfortunately at this time I didnt have any way to scan my truck. Anyway I installed 43 lb injectors and an intercooler and this is where I lost it.

I had Allen do a PCM for me prior to installing the injectors and IC. After I got this tune the truck ran good but had no power at WOT. I checked everything I touched and it is all tight and working correctly. I checked my fuel pressure and its 50 psi at idle and goes to 60/62 at WOT and doesnt drop. The truck runs good, no DTC or SES and no missing, just no power. I am getting 5 psi at the manifold, this is where my boost ref is.

Allen is currently doing another PCM for me but I was just trying to understand where my power went. Would a couple degrees timing make this much of a difference. I think Allen took some timing out to be on the safe side. Its at 14.5 or 15 at WOT then goes to 16 at about 5000 rpm just prior to the shift. So if anyone is willing to look at my logs and give feedback let me know.

I have attached some condensed logs. My whole files are to large to attach and I dont know how to reduce them any more than I did, Ive tried. So if anyone is willing I can e-mail them the whole log on a spreadsheet or AutoTap .ATL file.

Thanks for the input!!

Johnny Walker

 

Sounds like you are running VERY rich at WOT.....without the computer re-programmed for the larger injector all you are doing is dumping alot more fuel than necessary into the engine

 

Sorry I may have been unclear. It was tuned for the bigger injectors before I installed them.

 

Is it possible that you are running extremely rich due to the increased efficiency of the intercooler and the VE Tables need to be reworked??? Sounds like a rich condition to me as well.

 

When I upgraded intercoolers, I went from 11.7/1 to 10.5/1. So that's definately a possibility. Timing looks good enough to make good power. I'll bet you're PIG rich, and the pe/rpm needs to be adjusted. Are there any dyno's with a wideband in your area you can get on?

 

If you had the truck tuned for bigger injectors... but ran the small ones, up to redline at WOT - that may have caused you some problems. You would have been running very lean.

I hate to "go there", but you may need to pull the plugs and inspect them.

 

In the logs, 02's are quite rich... but being narrow band 02's, I can't say if they're in the correct range or not.

I don't know what people see on narrow 02's with F/I... but if you were lean like I was thinking above, you would see them like, under 880 or so.

Do you have any logs from before you put in the 42lb injectors, but you were running the tune for them?

 

You need to relocate the vac line on the waste gate from the turbo to the intake manifold. I had the same problem when i put the IC on.

 

Jerry2500, Im getting boost at the manifold as I did before. What does the vaccuum line have to do with the power? Is it because you lost boost because of the IC preassure drop? I got that also but I have an adjustable boost control so I just turned it back up.

If It was another reason please let me know. Did you just run a long hose up to the manifold and tee into your boost ref?

 

The IC restricts the airflow So your wastegate see 5psi before the IC instead of the manifold,therfore the wastegate open sooner and lost of boost. I ran a separate line from the wastegate to the manifold. I don't have a boost gauge so i don't know what the psi was before and after the IC.