How-To: Rescale your MAF (without pics)

[EvoMike]

Multi-post

[shadow1]

It's tough to scale a MAF and injectors at the same time. Although for the injectors, there are a lot of numbers already published on evoM that make the process easier. Even if you borrow someone's FI scaling and latency numbers, it is still a good idea to verify that they work on your car before you scale the MAF.

[EvoMike]

Yeah I hear ya. I tried starting with several injector scalings and latencies from many of the evoM members. I ended up with a higher injector scaling with horrible openloop accuratcy between acutal AFR and what is set in ecuflash. After reading throuh several forums at least one person in each thread mentioned MAF but didn't really get any support. Apparently MAF Scaling is just as necessary as injectory scaling and AFR tuning.

So please if I am wronge, The "best" most accurate order to tune the different systems would be to:
1 Start with last known "good" injector, intector scaling and injector latencies combo used
2 Tune MAF scaling to bring Fueltrim_Low and Fueltrim_mid as close to 0 (zero) as possible in respective Hz range
3 Change Injectors and adjust injector scaling and latencies to bring Fueltrims back to 0 "zero"
4 Finally adjust MAF Hz range for openloop till actual AFR equals projected in ECUflash fuel table

Thanks for hanging in there with me. I am mostly new to tuning the evo. Been tuning AFR with mostly stock set ups for a couple years but never got into depth like this.

[Appauldd]

The "best" method above is close.

You really don't want to mess with me MAF until you have your injectors scaled as perfectly as you can get them. So some injector tweeking is usually necessary before you start messing the MAF.

Then you use the MAF scalings to bring the injectors even closer to 0 LTFT.