Fuel Trim Tuning help...

[TurboBlue]

Ok, i just got and installed my logger tonight. I understand (or at least tihnk i do) the basics of tuning with an AFC. But i want to be sure before i go doing anything.

My FTRL, FTRM, FTRH are all at like 138.9 all the time. Now obviously this means the car is running to rich...correct me if im wrong....so that would mean i would have to add or subtract from the settings on the AFC?

I got an article that sais if the trims are positive, add a few percent or something. But isnt the AFC telling the car its seeing more air if i add? Thus adding more fuel in return? I plan on fixing some boost leaks tomorrow and then i really wanna start tuning. Any help would be greatly appreciated. Thanks

 

[Chrisjones500]

Ok, i just got and installed my logger tonight. I understand (or at least tihnk i do) the basics of tuning with an AFC. But i want to be sure before i go doing anything.

My FTRL, FTRM, FTRH are all at like 138.9 all the time. Now obviously this means the car is running to rich...correct me if im wrong....so that would mean i would have to add or subtract from the settings on the AFC?

I got an article that sais if the trims are positive, add a few percent or something. But isnt the AFC telling the car its seeing more air if i add? Thus adding more fuel in return? I plan on fixing some boost leaks tomorrow and then i really wanna start tuning. Any help would be greatly appreciated. Thanks

No your car is not running rich it is hella lean...The 138.9% means that your car is having to add 38.9% more fuel than normal... You need to add fuel all across the board and with it that far off and you are probably needing to upgrade fuel system in a few ways...I should have read your profile but what fuel upgrades do you have done??

 

[TurboBlue]

right now just a 255 with 450's, EVOIII 16g and FMIC, hopefully 550's will be coming very soon...

 

[Chrisjones500]

Well the upgrade for the injectors will help for sure...2 Questions...Do you have an adjustable fuel pressure regulator?? Did you remove the honeycomb out of your 1g MAF?? If you did remove the honeycomb you should probably put it back in until you do some more fuel upgrades...