So my MAF frequency, during WOT for most of my powerband is over 10000

this can't be good

i am running stage 2 tune, 2.8" pulley, Injen CAI, and ngkbr7e's gapped at .40

should i regap? how bad is this?

should i put my stock airbox back on?

 

not bad at all,Many people have upped it because their car acts weir after a hard run, they actually bump it up to 13000 so the car keeps it nature cool.

 

Im one of those people

 

Mine has been uped to 12000 I think...or 11000....I would take the intake off

 

i'm a n00b when it comes to tuning.. is it the higher it is, the leaner it is?

or is it the higher it is, the richer it is

and also, what are ideal #'s

i thought it was supposed to be around 7000

 

I don't think the maf frequency in itself determines if the car is running rich or lean. It's just a measure of how much air is flowing past the maf.

 

how do you up your maf freq. then?

 

Why do you think it's bad that the MAF frequency is so high? Is it causing the car to throw a code or run poorly? If so, with HPTuners go to Engine Diag, Airflow, MAF Sensor, MAF Fail High and change the number to 12,000.

I think the only way to physically lower the maf frequency is to put a bigger pulley back (or the stock intake) on so you are not flowing so much air.

 

i'm just so paranoid b/c i'm getting about 4* of knock at WOT

and i am not sure if 10000 maf freq. is safe or not

 

Around what RPM is the knock?

I don't think it's the maf frequency causing the knock. There is no reason 10,000 is unsafe as long as your injectors can keep up. In my opinion, you are running out of fuel with the 2.8 which could cause the knock. Especially since it's so cold out today.

 

You will get a code....I got a cel with too low of a maf frequency....but then it went away...and that was with the upped frequency too which is weird

 

This is part of the reason I went with a LT1 maff. I don't have to scale it back, as it has a higher "window" (it can flow more). Try changing it as mentioned, or you could look into putting an LT1 or LS1 maff on.

 

"Upping the limit" and "scaling" your MAF calibration (up or down) are really 2 different things.

When someone uses the terms "upping the limit" , this is really just done to prevent the MAF Hi Freq DTC from failing when you have made flow (or engine RPM) improvements that will increase the air-mass up to the FAIL limit. Very easy and common adjustment in HPT.

Rescaling the MAF is a table string adjustment is done in an attempt to correct the correlation between the sensor frequency and the actual air-mass to compensate for changes/modifications to the intake/inlet OR (as BadBoy points out) if you install a LARGER MAF to eliminate any bottle-neck in the inlet tract. Proper rescaling of the MAF can really only be done using sophisticated flow equipment connected across your intake, but the good ol' trial & error method can sometimes be successfully employed.

HTH
WOT

 

Great post as usual. Oh, and thanks for the "BadBoy" compliment.

 

What model number for the lt-1 maf are you using. I have a few in stock and was wondering if they would work out.

 

I can get you a part number monday, but any LT1 maff works (vette, f-body, b-body,etc). I just bought an IAT sensor for a w-body, and an LT1 maff connector, and it works great!

 

Cool. Are you guys running any oversized mafs yet? What sizes are you using?

 

Well the LT1 F-body maff I'm using is larger than stock, and I'm using 3.5" intake tubing. I'm not sure what qualifies for "oversized".