ECMlink Goes lean and breaks up around 4k

[VPEFab]

Bump* I'm experiencing exact same thing.

No matter load, TPS percentage, around 4k-4500 rpm it always almost hits an Ignition limiter, that will actually bounce rpm back a few times. The Lean condition isn't justified by the MAF and AvgAirVolPerRev values which seem to build progressively normal with boost and rpm.

I have tried multiple different plug gaps, reset fuel pressure and validated regulator diaphragm isn't rupture. Fuel seems to respond right before the lean condition, I have experimented richening up the graph leading in and found the fuel system responsive before and right after. Smoked the system and found no leaks after rebuilding throttle body and a few turbo gaskets. Pretty stumped here.

 

[AWD-Tony]

Bump* I'm experiencing exact same thing. No matter load, TPS percentage, around 4k-4500 rpm it always almost hits an Ignition limiter, that will actually bounce rpm back a few times. The Lean condition isn't justified by the MAF and AvgAirVolPerRev values which seem to build progressively normal with boost and rpm. I have tried multiple different plug gaps, reset fuel pressure and validated regulator diaphragm isn't rupture. Fuel seems to respond right before the lean condition, I have experimented richening up the graph leading in and found the fuel system responsive before and right after. Smoked the system and found no leaks after rebuilding throttle body and a few turbo gaskets. Pretty stumped here.

Post a log

 

[VPEFab]

The hits are at the end of the log, after warmup

 

[AWD-Tony]

1. Please fill out your profile
2. Looks like you're using WB in the front location and also using it to simulate WB. Is this correct? If so, go to NBO2sim tab and check that box. Also find the correct switch point for your WB
3. Are you on MAF or Speed Denisty. My guess is MAF
4. You need to start over. This is not a good tune.
Zero the fuel and timing table.
You're fighting the MAF slider as it's pulling fuel the way it's currently set.
5. There's a pending Throttle position circuit malfunction code.
6. I would load the factory timing tables.
7. Are you on pump or E?

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[VPEFab]

2. Looks like you're using WB in the front location and also using it to simulate WB. Is this correct? If so, go to NBO2sim tab and check that box. Also find the correct switch point for your WB

No, but I just realized we had stolen the front narrowband input for the WB. My man! Will look into this!

3. Are you on MAF or Speed Density. My guess is MAF

Speed Density is not selected, entire table is blank, running 2G MAF.

4. You need to start over. This is not a good tune.

- What exactly is the issue? Like I have no issue with that just trying to figure out what this output is.

Zero the fuel and timing table.

- Timing was pulled because the computer was pulling timing itself, we just adapted to what it requested. What you see is what the car wanted, though i was hoping you'd provide some insight as to why. If i zero timing sliders, I will end up with knock as I just re-zeroed the entire tune after rebuilding the throttle body and turbo.

You're fighting the MAF slider as it's pulling fuel the way it's currently set.

- MAF slider is set to target an 11.5AFR target currently, under 1900mhz we are running 10.9AFR. The stock graph is fat and it is my understanding the MAF comp Sliders are adjusting what the base computer sees. With the 570cc injectors, 20* map scaled, 2G MAF sensor, this was rough a 11.0 AFR graph above 1000mhz, at 8-900 where we are now seeing lean conditions, we were set at 9.0afr. right before the hit.

5. There's a pending Throttle position circuit malfunction code.

- Good catch! After just rebuilding the throttle body, that could have been my bad, will look into. Im clearing it now and seeing if it comes back.

6. I would load the factory timing tables.

- So i can zero all this and nail in my AFR real quick, not a problem but i need some input here. You can clearly see on graph timing is lateral as is MAF values. It isnt a timing wall, or an AFR wall created off of this tune that I can see on log. I have tuned many things and hit timing walls and it that is what it feels like. But the only timing jump you can see on the graph i sent was after the lean hit. I will pull timing on this old girl and zero out the graph. But this isnt the first time ive done so.

7. Are you on pump or E?

this is 93

 

[AWD-Tony]

I’m not home. Target afr in closed loop should be 14.7 and 11’s in open loop. Are you saying that the ecu sees knock and that’s why you’re pulling timing?

 

[jed344]

Your tune does not look good. First zero out timing sliders. Use direct access table to make timing changes. Second use the max octane table to set target air fuel ratio for open loop. Zero out the fuel sliders and use maf comp to hit target. Using the sliders and DA tables is not a great idea, I only will use the timing slider if at the track and have to make a quick adjustment before another pass and do not have much time. When you use the timng slider it will pull that timing at that rpm at any load vs DA table where you can pick the load cells.