Need Help With Turbo Tune (Tune and Log Inside)

[mikeyayell]

I have a 370 cubic inch InconTT car. Car has a small cam and is on 10lbs of boost. I had the WOT tuning done at a local shop and the car made good power for a break in "safe" tune. My problem is that the car breaks up badly at 3500-4000 rpms. I dont have a wideband on the car and the AFR on the dyno was 11.5 WOT. The car is also getting KR and I dont know why. Also, I have 2 intank Walbro 255s and 60lb injectors and the car is running out of fuel. The pumps are wired together, so they're working constantly. The car is on a 1Bar SD tune right now. Car was tuned with Efilive. Can anyone look over the tune and see if they can find anything. Any help greatly appreciated.

[Stealth97]

I'm limited in my knowledge but I'll help you brainstorm.

Have you checked your spark plugs? The car may have been running perfectly on the dyno day and might now have fouled the plugs. You could have been rich while tuning, and 11.5:1, while not excessively rich (at high RPM), could have still fouled them. What is the gap on the plug? Are you flowing so much air and making such a big spark that it is blowing out? Try gapping down and see if it helps.

Post back after you check the plugs and ask questions if you don't know what you are looking at (Are the plugs white and hot or black and dark?).

Eric

[mikeyayell]

TR6's at 0.30. How does the log and tune look? I still cant figure out how its running out of fuel.

[mikeyayell]

Here is a run down of the car:

Engine:

370 Cubic Inch Iron Block
9:1 C/R
Stock 317 Heads
GM MLS Gaskets
222/222 114lsa Cam
ls6 Intake
Stock TB
ARP Everything

Fuel:

Dual Intake Walbro 255s
60lb Injectors
PP Fuel Rails
V6 Fuel Lines with Return
Boost Referenced FPR
Methanol

Drivetrain:

T56
Textralia Twin Disc Clutch
Moser 12 Bolt

Incon Stage 3 TT Kit

[Stealth97]

I forgot to address the issue of running out of fuel. How do you know it runs out of fuel? Does the wideband go lean at 3500-4000? How lean and does the spike coincide with the breaking up?

Did you check the plugs to see if they are currently fouled? Sometimes you can take a badly running turbo car, change the plugs, and it is smooth as butter afterwards.

I have not looked at the tune yet. Again, I'm an amateur, but willing to help and listen.

[SS2win]

does that log really say it's commanding less than 8:1 when you floor it?

[nevinsb]

Do you have a fuel pressure gauge on it? Does it lose rail pressure when it "runs out of fuel"?

[mikeyayell]

FP is 55psi idle and 70psi WOT and does not lose pressure.

[SS2win]

without a wideband you're just pissing in the wind.

[joecar]

Some comments:
- Do you have the manifold-referenced FPR...? If so, then B4001 is wrong.
- B4001 IFR doesn't fit your 60 lb injectors.
- B0101 VE table looks wrong.
- MAF sensor is not working.
- MAP sensor is pegging at 104kPa, shouldn't it go higher...?
- If IFR, VE, MAF are made to work right, then AFR and INJDC will come good.
- Wideband is required.