ECMlink Some log opinions needed, also why the knock?

[98gst14b]

Heres a log I just did tell me what you think I got 4 deg of retard is that because of my high eng temp??

 

[JayRolla]

Well if the WBO2 is logging correctly which it looks like it is during cruise you go really lean up top. Down low your in the low to mid 11's and you hit as high as 13's up top which is real dangerous especially on pump gas if that is what you are running.

May be a number of fuel issues causing this. I also notice timing is really high but you are also not pushing much airflow at the moment. Fuel trim is also maxed -12.5% indicating a rich condition. Are your injectors setup up correcly through global and deadtime?

 

[98gst14b]

well yea but I had to mod deadtime a lot, btw Im using 93 oct /w 10%ethenol, and 100% denat alchy

 

[JayRolla]

According to fuel trims the injectors are not set up correctly. Try to adjust global until the lo fuel trim is within 0-5%. If the fuel sliders are stock and the WBO2 logged is correct than you have a fuel delivery issue. With correctly adjusted injectors and stock fuel sliders you should see around 9.5:1 AFR's at WOT.

 

[98gst14b]

How much % from global do you think I need to adjust the ltft

 

[98gst14b]

I lowered my global 5% and my ltft seemed to come up but I started doing a pull and ran really lean so I let off, whats going on here??

 

[98gst14b]

Alright got another log here I took global up to -40%, adjusted deadtime to +- 5% on stft and got the ltft's to come up. I did a couple runs and my afr's look better too but why does it lean out to 12.5:1 around 4500-5000 rpms and then richen up again to 11:1??

 

[DirtyBirdRacing]

How much % from global do you think I need to adjust the ltft

Hi,

I would refer to the following link for your initial global and deadtime settings for your injectors. Then work from there.

baseinjectordata [ECMTuning - wiki]

Bill

 

[98gst14b]

I found out I have 750's not 850's whats with the mid powerband knock and lean condition??

 

[DirtyBirdRacing]

I found out I have 750's not 850's whats with the mid powerband knock and lean condition??

OK, so I compared your RPM and gram per rev points. When this is compared to the timing map from your log it looks to be in line with your logged data (5411 rpm at 2.41 gm/rev gives about 21.2 degrees of timing (knock retard + actual timing advance)

When this same rpm and gram per rev point is compared to the A/F maps from your log the desired A/F and logged A/F dont match up.

I see in your profile that you have the GM MAF. Did you setup your ECMLink properly for YOUR GM MAF? I say your because to my understanding the measurements between them can vary quite a bit. This may be why your A/F ratios don't match up to what they should be.

Maybe this link will help:
v3mafadjcombft [ECMTuning - wiki]

Bill

 

[98gst14b]

I have tried CombinedFT before but I can give it a shot again.

 

[twdorris]

How much boost are you actually running in those logs? Without that information, it's hard to tell if the airflow data is accurate or not. BoostEst suggests up to 30psi! If that's far over what you're actually running, that's certainly a sign that airflow is still off.

The WB data in that log suggests the WB kit is unable to properly drive the ECU input it's connected to (EGR Temp). The result is a flat-lined WB reading in the log that doesn't drop below about 11:1 despite having real A/F ratio that's probably a lot richer. To correct this, you'll need to "buffer" the ECU input. More details can be found on our ECU Input page.

Post a log showing normal idle and cruise conditions. I'd like to see how the front O2 sensor compares to the PLX data when we know the car is running around stoich. This log might also help calibrate the GM MAF a bit. The current calibration doesn't seem "right" to me just because there are no adjustments anywhere other than WOT.

Thomas Dorris
ECMTuning, Inc.

 

[98gst14b]

Heres a takeoff, cruise, little accel, redlight, takeoff, etc

And the 2nd is idle

Thanks Tom

 

[DirtyBirdRacing]

Based on your logs you still look to be running lean in both open loop and closed loop operation. But also none of your wide band readings are richer then an AFR of 11:1. I would try the CombinedFT again if you already havent done so. If this doesn't help, I would go along with Tom's suggestion of "buffering" the ECU input to ensure that the W/B is reading correctly.

Bill