LTFT high/low?
 

I just tuned my brz using the oft! Its currently on stg1. MY Stft trim hovers arund -3%, which i think is fine.... myltft on the other hand hovers around -19% on idle and -15% while driving. I do believe its bc i got an injen intake on there. SHould i be worried? I realy dont wanna take off injen intake but will do so if needed. What can happen if I continue to run my car at these readings? Thank you!

Go to the software tuning forum and look at the guides and stickys. STFT will always fluctuate, a lot. LTFT is the average of the STFT and what you really need to be paying attention to, 5%+/- is okay for LTFT You likely need to datalog the car and make some maf scaling corrections. Your not going to kill your car running it currently like that but I would work on getting it corrected. That's way off, I'd double check the oring on the maf and make sure it is not nicked, damaged, or missing. I'd also hit it with some maf cleaner while you have it out.

OFT Guide
http://www.ft86club.com/forums/showthread.php?t=71157

Maf scaling info
http://www.ft86club.com/forums/showt...01#post1842501

An intake will usually cause a positive LTFT, but usually not very high. I never scaled my MAF with my Injen intake and LTFT (on 93 stg 2 tune) was around +5 or so. -15 is awfully high negative, you have another problem going on there.

Go back to the stock tune and diagnose what the issue is from there. If you scale the MAF with a hardware issue, you may scale the LTFT back to near 0, but you are only hiding a problem.

What's your LTFT at idle, 2500 RPM and 3500 RPM?

If you choose to do a MAF scaling yourself, do it properly. Use direct injection injection only and calibrate your port injection against it.

Refer to: https://youtu.be/NkqY9JVRA4M