if you currently have a tune with the 52lbs and 90mm, just read out the bin and post it up, from there you can learn how to modify and code certain sensors out.

Welcome! You can read and post your tune. I'm not sure we'll be able to make much sense of it, but we can try. You'll probably end up starting from scratch like I did, it's easier in the end.

Read this to get started and familiar with the tools/software you'll need:

http://www.nefariousmotorsports.com/wiki/index.php/Getting_Started

Then read Nye's tuning wiki article to familiarize yourself.

http://s4wiki.com/wiki/Tuning

Start with a stock M box file.

MAF scaling:

I have an 83mm RS4 MAF housing and originally attempted to scale the stock MLHFM MAP by calculating a correction factor:

73mm (stock MAF housing) / 83 (RS4 housing) = 0.8795

I then multiplied all of MLHFM by 0.8795. This worked ok, but my AFR would vary between gears.

So I redid the MLHFM by scaling from Tony@Nefmoto's 85mm MAF housing file. Copy Tony's MLHFM then calculate the correction:

85mm (stock MAF housing) / 83 (RS4 housing) = 1.024

Then multiply the whole table by a correction. This seemed to work better for me. You will calculate using 90 instead of 83, obviously. Try either of these routes and see how they work for you. I still have a stock KFKHFM MAF correction table.

Injector scaling:

You will want to get the datasheet for your injectors, if possible. You will need to edit KRKTE and maybe TVUB.

There is a calculation for KRKTE although a few of us have kind of just been estimating it and altering the value based on LTFTs. My gasoline 60lb Deka @ 3 bar KRKTE was 0.101, for reference.

My 1000cc EV14s came with a datasheet. I used the dead time specs for TVUB. When I had 60lb Dekas I used a stock TVUB.

Isn't the area of a circle pi(radius squared)?

to be clear, if r=d/2:

pi(D0/2)^2/pi(D1/2)^2 = (pi/4)/(pi/4) * (D0^2/D1^2) = (D0^2/D1^2)

make sense?

I think recalibrating MAF for new tube can't be as simple as multiply by any constant value.
Regargless how this constant was estimated.
And this was many times confirmed by live experiments.
As example compare MLHFM curves for Bosch S4 MAF and 1.8T 150ps ME7.5 400BB (4B0906018AL or similar)
Both MAF using the SAME insert-sensor and differs only in tube diameter.
What about this?


   

I've tried it both ways and gotten better results with your first method, similar to tony's stage 3 base file, and then tweaking kfkhfm.

tweaking both actually.  and i know it's not correct, but i was getting way higher numbers than I should have on the top end... so i massaged the top and bottom of mlhfm and then used kfkhfm to fine tune along with krkte