5" intake maf scaling with 6l80e

[h2.4]

What route are you guys doing when scaling Maf with a vehicle that has a 5" intake, that is running auto trans? It seems when scaling Maf with the oversize intake, the maf transfer function is lower than stock. With auto trans, I have modified the Virtual Tq. tables and trans shift pressures to compensate for lower maf curve. I have heard of other people fibbing the stoich table so that we keep the transfer function higher than stock with a 5" intake. How are some of you guys doing the Maf with 5" intake and auto trans? Just seeing what others are doing.

[Ben Charles]

If the fuel injectors are properly calibrated to what they actually are, and MAF is dialed in, engine tq should be close...

If you are at -50 tq or 100lbs of tq at idle, then it’s obviously wrong and needs corrected

[h2.4]

Yes, the car has id1700's and I have them scaled in correctly. But I am finding I have to reduce Maf curve, which I am assuming would report lower tq and shift pressures. I will see what we are reporting for tq at idle. I used wideband on dyno when tuning Maf, and trimmed it out with the Stft's. Ben, so I shouldn't be concerned that the Maf curve is lower than stock to achieve proper fueling?

[Ben Charles]

What do you mean by lower!? If HZ then that’s fine, if g/sec then we don’t want it too low

[LSxpwrdZ]

I pretty well delete the MAF on all the car's with 5" intake tubes... the MAF is way to noisy on something with a inlet that large especially if it is a card style MAF.

[h2.4]

James, So if doing a Sd conversion on these cars. Is everything in tact as far as calculated load and tq still for a6 trans shifting? Or do you go in and mod/calculate Virtual tq along with shift pressures?

[Ben Charles]

VVE will do the calculation just like the MAF would.. so if accurate tq mode will reflect the same as MAF would..

[h2.4]

Alright, thank you for the input. It is appreciated.

[LSxpwrdZ]

Yes what Ben Charles said. The SD model when calibrated properly should yield the exact same airflow as a calibrated MAF would. It's just an alternate method of measuring/calculating airflow. In the end the airflow is the main source used to calculate all the TQ models along with other variables.