Rhino74

iTrader: (1)

When you do a search here for "MAF ends" you find all kinds of stories and opinions, mostly negative.

Having just bought and installed MAF ends on my LS1 GTO, I was wondering f there s there anybody out there who has put Maf Ends, ie Tbyrne, etc. on thier MAF and experienced trouble free operation from the get-go?

My car is without a transmission right now, so I have yet to start it up with the MAF ends installed.

Thanks guys!

SmokingWS6

iTrader: (1)

For it to perform correctly the maf table in the pcm will need to be recalibrated

Rhino74

iTrader: (1)

Prior to a re-calibration, will the car be running leaner or richer?

What is the extent of the recalibration? Is it a baseline correction to the fuel tables, such as 5% richer or leaner?

I've had people tell me that there is a fuel trimming effect that causes te motor to run 4-7% ricehr but I've also read a lot of posts by guys whose car lean out after putting on MAF ends. As with all mods, it seems like for every bit of knowledge gained, you wind up more confused than before.

Would you think that adding/ pulling 4-7% throughout the rpm range via a hand held programmer would compensate for the effect?

SmokingWS6

iTrader: (1)

It will read leaner, possibly a lot.

A baseline calibration will work, Usually more of a midrnage boost is needed around 5k to 6000hz

It may run richer due to the pcm over correcting for the lean condition.

Billiumss

iTrader: (11)

From my own testing, by switching to "ported Maf ends" you will be about 5% leaner.

Rhino74

iTrader: (1)

ACCCCK. Dude, are you trying to fry my noodle? In a few words, you go from "it will possilby run a lot leaner" to "It may run richer." That's not the kind of thing my simple mind can process. ;P

I'd heard from one source that with ported MAF ends, the part throttle A/F will lean out by 4-7% but that the WOT A/F may fatten up by about that much due to an overcorrection. Not sure if this is true, seems like whatyou may be saying, but still not very helpful, unless it can be verified by someone who has put this theory to the test.

Then again there are guys who have put up before and after dyno graphs that show immediate positive WOT gains throghout the rpm band with a simple MAF end swap, so it doesn't seem like the A/F could be getting pushed that fat, or it would rob some power, wouldn't it?

Another_User

The car will run much leaner. I was able to tune for them on my old Camaro though.

Rhino74

iTrader: (1)

Before and after MAF end swap dyno runs, courteousy of another board member.

http://www.stealthram.com/familypics...mafhousing.jpg

Go figure. Looks good, though.