Advice/Questions with ECMlink v.3

[95talongirl]

Why hi again all you guru's out there!

As some of you may have seen, I've been playing around with DSMLink with my car. Thanks to the help of everyone last summer/fall, was able to get the car to run decently. After some weird breakup issues that were caused by the MAF sensor, now the car is running quite strong. (The MAF had to manually be calibrated... took some time, but it's working great now)

Well took the car tot he track yesterday to collect some WOT data past 6000RPM. Currently the car is running 17-18psi (the gauge kinda fluctuates between those) It's seeing 11.1 to 12.0 A/F at WOT. The 12.0 kinda worries me some.... since I'm only on pump gas (93). I was not launching the car nor shifting it it aggressively. To my surprise, it was trapping 106.7MPH; but was running in the 13's since I wasn't driving it that hard.

The weird thing is I keep seeing some knock retard varying from .4 to 1.1 deg. However, if you look, I'm running very low timing. (At least I think?) That brings me to the questions. How are the timing tables read? The 7 degrees, is that on top of the base timing? Or is it truly degrees? It seems no one at the track had a clue, as their systems read timing differently. Also, the retard, could this be arbrutary? As if its picking up some vibrations at the higher RPM and thinking its knock? Reason I ask is because I kept taking timing out, and it didn't help; it'd still have the same pattern of knock retard in the same spots.

One last thing, 'm using 650cc injectors and hitting about 82% Duty cycle on them, should I put the larger injectors in this car?

Thank you for any advice! It's greatly appreciated!!

 

[snowborder714]

Either your AEM isn't being logged correctly or your MAF Comp still isn't done properly. You can see this by viewing only AFRatioEst and the AEM signal. Those two lines should be almost identical. I'd suggest watching these 2 videos and configuring the AEM properly in link.
http://www.dsmtuners.com/forums/articles-tuning-ecu/428702-ecmlink-linear-wb-calibration.html

Also, not sure what the massive spike in the fuel sliders is for, but I'd suggest using only the DA tables. So I would zero those all out.

Very smooth MAF Comp curve Now let's just hope it's the AEM reading wrong and not the curve being incorrect. Tuning a GM MAF can be a real pain.

At 82% IDC's I'd say you're fine. Anything above 85% is when I'd say you should start looking into larger injectors.

As long as base timing is correct, the timing values in the table are actual values the ECU will shoot for. So if base timing is correct and you have 7° set in the table for 1.8 load and 5500 RPM, then you should see 7° at that point.

 

[95talongirl]

Thanks!

I'll check those videos out and see if it's an AEM problem. I really just picked an AEM option from the menu that *seemed* to match the best. So it would be worth going back into and rechecking that out.

Also thanks for the clarification on what exactly those timing values are.

 

[95talongirl]

Update... Had a chance to go in and setup a LinWideband for the AEM gauge. I adjusted the voltage offset to where it matched up to the AirFuelEst pretty close at idle. Then took it out and did a few 2nd gear pulls. It still seems to be off quite a bit once it starts getting into the higher RPM's.... and it's still taking timing out over 6000RPM. I'm not sure what to think of this, since its running virtually no timing to begin with.


Thank you for any input.... I really don't want to try to add more boost or timing until I can get the knock retard figured out as well as the wideband.

It's still running 17psi.

 

[snowborder714]

Even with that idle log being not up to temp, it looks pretty lined up. There are no pulls or knock in there, so I can't evaluate that.

 

[95talongirl]

Well I did a little bit of digging earlier... and I think what I was perceiving to be knock, isn't much. The KnockRet at some spots would take out .4 to .7. From what I've read earlier this is not that bad.... but correct me if I'm wrong. !

The only "pull" I had in there was a 2nd gear one to 6100-ish rpm. Going to try to get it out tomorrow other than in the subdivision to get it into third.

Thanks for checking it out! Tried to get it closer from where it was.

 

[snowborder714]

You're correct in that .4 to .7 is not bad at all.

A 3rd gear pull from 2k to redline would be great.

 

[95talongirl]

Ok, that's what I was concerned with... Shall grab a 3rd gear log today sometime and see what happens!