EFIDynoTuning Forum

correct, don't forget your injector offset and adjusting your crank pw

If your maf is 'calibrated' for your injector size then all you do is input your injector data and your maf curve is correct since its calibrated for those injectors.

You can verify by using your data sheet and comparing the two. They should match pretty closely, if they don't then your flow sheet for your maf is wrong.

Hi Decipha thanks for verifying the instructions your assistance is truly appreciated.
- As for the Crank PW do you recommend I use the Same Values I had in J4J1 I did not modify these tables.
- And do I change both Crank PW FN348A (ect modifier) and FN1350 (Multiplier)

no
no

adjust only the cranking pw as detailed in the fuel write up

Ok I read the Fuel WriteUp and saw that Cranking PW requires scaling in table FN348.

OLD injector size / NEW injector size * NEW engine size / OLD engine size

This is a frest T4M2 my engine size has not changed.
1. Since the TM40 is a stock 19Lb injector tune the scaling formula would be 19/24 = .79
2. You would multiply the Y-axis of the cranking pw function as a percentage of the above:
3. So i took all the values in this table and multiplied them by the scaling factor of .79 giving a smaller pulsewidth

correct

Ok loaded my T4M2 Tune into the car and have a couple of issues
1. Noticed my Maf is lean and had to add 30% to the entire curve which was within 1% Kamrf on the J4J1 strategy.
2. Maybe the PROm curve i had was incorrect as i did not have a print sheet with it. It is a fender style since it has a flange with 4 bolt connectors and the Maf itself says recalibrated on it, and have it connected directly to my KN filter inside the engine bay.
3. My idle is not stable and stalling while engaging the clutch at times in forward and reverse
4. I have slight surging when stopped at times and stable at other times.
5. My Kamrfs are within 5% at the moment.

for it to be off 30% you had to input something wrong somewhere

the rest of it just dial it in