just installed 550cc injectors, why is it doing this?

[FastGS-T]

alright so i had a good hi and low throttle tune on my 450's in installed my 550s this morning and i cant tune my low throttle at all, ltft is stuck at -4, so i just tuned it by the stft so i can get close, but its NOTHING like my 450s tune.

i have a maft and i set it for the 550s, so i figured my current tune would stay the same with only minor adjustments,,, regardless of my lo throttle tune, my hi throttle ran fine just with a little smoke

why is my lo-throttle ltft stuck at -4%? i set my maft for the 550s so shouldnt my tune have stayed the same?

 

[spyderturbo007]

FT's are a funny thing. Every car is different, so what works for someone else most likely won't work for you.

Anyway if your LTFT is -4 and your STFT is close to 0, you will be fine.

Is the car running wierd or something? I'm not sure what you ment by "but its NOTHING like my 450s tune."

 

[Black95TSIawd]

mafts might be good for venting and utilizing a free-flowing sensor, but they suck for tuning. Its practically hit or miss with those things. Try setting it to 450's again and tune in increments on your own.