gregrob

iTrader: (8)

Well we decided to make a run with the granatelli on my buddies 94 firehawk and log it. Then switch to the stock one, and run again to see the results.

With the granatelli the car was runnin rich, would black smoke when you started it cold lol.

Granatelli MAF was 890-910mv on the 02's. Stock descreened MAF it's down to 820-830 under WOT.

Granatelli was 36deg spark advance with 10 deg of knock retard, for 26deg of total advance

Stock descreened maf yielded 35deg of spark advance and only 4deg of knock retard under wot, for 31deg of total advance.

AFGS numbers were much higher with the Granatelli. 210+ vs 160-170 on the stock one.

Car seems to run better to me. It definitely sounds different. It likes to rev a lot more freely, and seems to get through the gears quickly.

With the granatelli it had more midrange 'snap', but seemed like it was struggling to rev. I credit this to the stock maf leaning the car out quite a bit. It actually may not 'feel' as gutsy, but would probably be faster on the track because it gave it more top end.

We had to make 2 runs because evidently unplugging the maf throws the car into open loop mode and the first run we made with the stocker was in open loop lol. The files below are in closed loop for both the Granatelli run and the Stock desc MAF run.

The stock descreened maf is staying on the car and the Granatelli is for sale if anyone wants it.

Here are the TTS Datamaster files if anyone would like them.

Granatelli MAF
http://forddieselpower.com/grfiles/granatellimaf.uni

Stock Descreened MAF
http://forddieselpower.com/grfiles/s...closedloop.uni


Discuss.

LM97Z

iTrader: (4)

I took off my Gran. MAF (came on the car) & replaced it with a stocker (with the screen), car runs super, those Gran. MAFs are a waiste of $$$$.

hitmanws6

iTrader: (20)

the stock maf is good up to 500 hp. cleaning it is the best thing you can do to it

LS1 SPEED

iTrader: (22)

We have always seen the best results with a stock unmodified MAF.

Jon@BruteSpeed

iTrader: (3)

I agree and my Gran Maf found it's way as a target on a firing range.

96capricemgr

iTrader: (1)

160-170gpm means there is still someting wrong with that car.
I am glad the stock MAF made things better but there are more problems to find.

gregrob

iTrader: (8)

What should the AFGS numbers be, and what could be causing this?

Thanks

ss.slp.ls1

iTrader: (36)

No point in changing the stock MAF. By the time the MAF becomes an issue, you might even consider a speed density tune.

my94blackz

I had a can tuned to a granitelli swapped to the stocker while still on the dyno, same tune same everything factory lost 15RWHP. May have been where it was tuned for the Gran. but thats what happened.

96capricemgr

iTrader: (1)

It is the fact that the stocker is accurate and the pcm had been tuned for the incorrect readings of the Granatelli.

gregrob

iTrader: (8)

Anyone?

PoorMan

Stock MAF only flows 670cfm.
http://dtcc.cz28.com/flow/index.htm

I am buying a Z06 MAF and just using TC to interpolate my MAF tables. I don't see what's so hard about that. Anyone who sticks a aftermarket MAF in a car without changing the table can't expect the car to run well. Pro Tuners don't like aftermarket MAFs because they like to "cut and paste" from car to car. If you have an aftermarket MAF then you make them "work" because they have to change the tables then drive it a couple of times to get it right. Anyway, the gains I bet are 15+hp for a cam/heads car.

ss.slp.ls1

iTrader: (36)

You have a nice set up, but I still don't think you are making enough power to warrant a larger MAF.