When is it necesarry to rescale your MAF?
 

At what point is it necessary to rescale your MAF? I was told when I installed a new intake to do it, but I just want to make sure that is logical. To me, I don't understand why you would do that after an intake that uses the same stock MAF. I thought that was if changes to the MAF were made, or upgraded to a larger MAF altogether a rescale is necessary. (ex, I just installed a new ETS intake where the MAF is after the filter)

Shouldn't a higher flowing filter simply result in the MAF reading more airflow?

Thanks for helping me make sense of this

As far as I understand it, different intakes can create an offset in the frequency of the maf sensor. That offset causes problems that can be corrected by compensating for it in maf scaling.

Ok I suppose that makes sense, the MAF is calibrated accurately, when used with the intake system it was designed for. Thanks!

99% of the time only when you change the size of the actual MAF housing.

In terms of scaling the Maf, do you guys think its more accurate to take the average trim of each maf voltage range, or would it be more accurate to filter out everything and only work with the trims at 14.7 afr and take the average of that instead, given that I am able to datalog AFR? I understand I'll have way less usable data, but would this yield a better scaling?

For loads under 120 you can use a TON of logged trims. It works. You have to disable the MAP don't forget.
For WOT tuning of the upper part of the MAF curve, I posted instructions once here:

https://www.evolutionm.net/forums/ev...elper-app.html