EvelBist

I put a truck 85mm 5pin MAF on my 02. It still has the stock throttle body and stock intake.

Should I multiply the MAF table in my current tune by 85/75 to reflect the greater airflow?

Or is the stock TB going to keep the flow numbers the same?

What should I change if anything? Thanks!

pdxmotorhead

I would always check the actual running numbers when swapping a MAF they do have some slop in their specs.. May not need anything,, may need to tweek it..

T/A KID

iTrader: (12)

Do a 1.10% increase and that will put it real close if the tune is spot on with the 3.5 MAF

2xLS1

iTrader: (25)

That would be way off if you did that. Multiply the whole table by .85 would get it close, but the easiest thing to do would be to open a 02 Silverado 5.3 file as a compare file and copy the MAF table from the truck tune into your tune. Then from there tune the MAF with A/F error or fuel trims.

EvelBist

Thanks again 2X. You helped me on HPTuners and now here. Awesome.

T/A KID

iTrader: (12)

why would you descrease airflw going to a larger tube!???
3.5 tube vs a 3.875 tube!??
latger tube will lower the MAF HZ and therefore need an increase in airflow