ECMlink, Using GM MAF, car runs poor!

[DSMDEMON93]

Hey guys, I upgraded to a GM MAF, ECMlink Cable, set it up correctly via DSMlink v3, but somehow the car will run poorly at WOT. I am trying to tune WOT currently, by logging a pull up to 5500rpm. As soon as the car hits WOT, it stumbles, hesitates, and flatlines. I bought a BRAND NEW GM MAF, and the problem still exsists. To test the theory, I unplugged the GM MAF, and installed my Stock 2g MAF, and the car ran phenominaly. So my question here is, WHAT THE HECK IS GOING ON!? The stock maf works but the NEW GM MAF doesn't? Here is a log to demonstrate what is going on. I know it runs rich, It is about 10.8:1 AFR at WOT, but it was a demo log, so I can start tuning. Please help me somebody! Thanks!

 

[blucas1984]

your afrest is 9.5 at wot , do you have a wideband? if you do they need to match. check for boost leaks too.

 

[95talongirl]

The GM MAF is a pain in the butt. I had the exact same problem, and found that you'll have to go in and calibrate the MAF for those higher RPM's manually. Use this site:

DSMlink MAS/MAF Calibration Page

What is your boost pressure set at? Does it match what the computer "sees"? On mine, it was WAY off and thus the car would "think" it was seeing more boost than it should, and cut out and dump fuel. I see in your log that it was hitting 20psi or so. Is that correct?

 

[snowborder714]

I'd suggest loading in the Evo 8 mod1 DA tables. This will lean the car out which should hopefully help.
evo8v3settings [ECMTuning - wiki]

 

[livedsm4g63]

I've found that the Evo maps are
Rather aggressive for a base map so I usually just used the 2g map then leaned it out myself as needed.

 

[snowborder714]

Well, 1g owners are recommended to switch to the 2g timing maps (at least at first) since the 1g's are very aggressive.

The Evo fuel maps aren't really aggressive. They are at a 10:1 AFR at WOT.

 

[DSMDEMON93]

Thanks guys, things are working much better now! If it wasn't for this community, I think I would have torched the car, .