Smoke Em

i run a Granatelli MAF on my car with no issue, with no tune. i haven't had any issues but i have heard that aftermarket maf really screw with the car sometimes. i would leave the stock one on, if anything just descreen it

pillarpod

i have a Grandsport MAF, and this thread is 5 years old

1961ba427

iTrader: (26)

Revived OLD threads are great reading for some of us Newb's who wouldn't have gotten the information otherwise. I'm using a stock MAF that was already descreened when I got my 97 SS, but have a spare one with the screen still in. I do know descreening the MAF on my old 89 Formula 350 TPI car worked great. I picked up over a tenth in the 1/8th and almost 2mph that was repeated backed up/tested on an extremely consistent car. Maybe not revelant to LT1/LS1??? IDK, but I think it should be okay if you run a good filter.

BTC

I've always been told that whatever the Granatelli MAF does is better accomplished via a tune. I've also heard that they make tuning difficult. I figure if you stick with a stock MAF and get a tune, you're going to save yourself some money, not to mention all of the additional benefits you might receive from a full tune. I don't know what a Granatelli costs, but a mail order tune is around 150 bucks.

96capricemgr

iTrader: (1)

To those who think the Granatelli is a good thing. Please DOCUMENT a result and some testing to show how the gain was achieved. Was the stocker a restriction? Was the Granatelli faster to read changes? What was the mechanism by which is made a MEASURED positive difference?


As BTC alluded too, aftermarket MAFs sometimes lie to the pcm to correct overly rich factory WOT tuning so if their lie is about the right amount to get the AFR right you might actually see a gain, BUT you spent $300 to correct the AFR when for $150 you could have had a tune correct AFR, adjust the spark and other drivability benefits like shift points for an A4. In that case it is still a really bad idea because you spent twice as much for half the gain.

Ed Wright shared his MAF findings with us some time back on an over 500rwhp car he found single digit gains in eliminating the "restriction" of the MAF so it is NOT a restriction on a stock car the way Granatelli would have you believe.

FASTFATBOY

iTrader: (23)

Ed told me a 85mm Z06 style maf was worth 4-5 rwhp in a back to back test. Thats 10 ish at the flywheel, 10hp for 100 bux, pretty cheap to me.

96capricemgr

iTrader: (1)

So you are now suggesting a 50-60% drivetrain loss
OK let's assume that was a typo and move on.

At what power level??

Does the ZO6 produce the gain by finer resolution, faster reading, reduced restriction or some other factor???


The ZO6 is finer resolution which I could see helping, within our pcms hertz range the ZO6 sensor maxes out at like 360gps where the stocker is 470ish. Since 360gps is pretty easy to exceed if the 4-5rwhp is at peak I guess we would have to assume it is a restriction reduction since above 360gps with the ZO6 sensor is basically tuned speed density but that still leaves the question of at what power level was this tested? If it was Ed's old 500+rwhp setup it may not do anything for a heads/cam car, but if it was a bolton car then that is significant.

FASTFATBOY

iTrader: (23)

So you are assuming drivetrain loss is a fixed percentage

Yes on his 500rwhp setup, why would it not help any other setup? A Stock Z06 is 346 inches, you reckon those engineers found something YOU dont know??

Just because it doesnt show a peak HP number on a chassis dyno has nothing to do with making the car quicker.

Here is what I can tell you and I proved it on a chassis dyno. I took a head cam Six speed SS LS car raised the bottom of the lid 1.5 inches off the core support and it picked up 20 lb feet of tq from 2500 to 4500 rom and 10 hp down there....at peak it was the same. You reckon that car was any quicker??

Did I change the MAF? No, but what I did do was make it easier for the car to breathe at lower rpms. This car made 450 to the wheels. Do you think a bigger MAF and tubing makes it easier for the car to breathe? ANYTHING you can do to make it easier for the car to breathe will make it quicker.

Tell you what you do, run down the street with a clothes pin on your nose, first with a straw then with an equal length piece of water hose then tell me.



See here for your other questions www.fastchip.com

97Z28SS

iTrader: (5)

EDIT: Never mind "What about the 85mm Z06 maf, anything to be gained there?"