MAFT tuning

[BlackbirdOfPrey]

I am having a few problems tuning with the MAFT. I am running the newest version with a 3.5in GM MAS in blowthrough mode and I have a logger with MMCD and this is in MAF mode by the way. The problem is that according to my logger I'm running rich in my high trims and idle trims (stock injectors set, rest zeroed out), and as a result when I get past about 4k I start having timing pulled real bad and start picking up about 10 counts of knock. I managed to get the idle trims back to acceptable levels (around 95%) I've tried adjusting the knobs for the high trims and absolutely nothing is happening, I've ran the car for a few pulls and the trims have stayed the same (81.2% high trims), and it seems nothing I'm doing is leaning out the high trims. Am I missing something?

 

[90_talon_matt]

1g ecus take a very long time to adjust fuel trims by themselves. its alot easier if you reset the ecu after making adjustments.

take the car out again and log it until the trims adjust themselves. if you are still reading overly rich you can try setting the base injectors to a larger size than you have, such as 450s or 660s. this will lean out the entire fuel curve and allow you to make smaller adjustments on the idle, mid and high knobs to get you fuel trims where you want them.

it takes a lot of messing around when tuning with just the translator but it can be done.

 

[1990EclipseGSX]

I've tried adjusting the knobs for the high trims and absolutely nothing is happening, I've ran the car for a few pulls and the trims have stayed the same (81.2% high trims), and it seems nothing I'm doing is leaning out the high trims. Am I missing something?

The high trims are not affected by WOT driving, only cruising. To make the high trims change you need to be at cruising speed, and not doing a pull. And as said above, it takes awhile, so be patient.