is a granatelli motorsports MAF sensor really worth it?

[no_doz]

http://store.summitracing.com/default.asp?target=eadvsearch.asp&SearchType=Make

[AaronGTR]

That link doesn't lead to a part, just a search.



Quite simply, answer is no. There a lot of other factors involved when changing MAF's and you need to be able to tune your computer to go with it. Otherwise you might run into problems. It's not as simple as throw a new MAF in and get some HP.

[no_doz]

thats what i figured, so it might help but without considering all factors, its $300 down the drain (which seems like a bit much for just a maf sensor?)?

[RednBlack]

Depending on what engine you have, you can bump up to a 75mm MAF for a few bux. http://60degreev6.com/discussion/vie...&highlight=maf

It works. You need it tuned though.

[torq455]

My Dad put one of those MAF's on his 03 Z06 and lost power. Also put one from JET on his 04 GAGT and it gave a code "too much air". He also has the 62mm TB from PFYC.com.

[tejohnson]

As Aaron mentioned, anytime you replace the MAF with a bigger one, you really need to make the appropriate changes in the PCM, otherwise, it will effect the performance. Most often in a bad way. There is a table within the PCM which tells how many grams of air is passing based on the frequency (Hz) response of the MAF. This helps the PCM to decide Cyl pressure for spark, and depending on the model of engine, quite a few other things.

[torq455]

Yeah, but supposedly they say the MAF has been calibrated for the car, so no need to tune. FYI, the vette already had the ECM tuned.

[vsop4me3.1]

I had one on my 3100. I did'nt lose any power and it was calibrated to my car. I was able to open up my intake. I might still have it laying around here somewhere.

[ProjectMM]

I have one, for a replacement if your MAS has gone bad, it's really not that bad for a replacement! I think. also I looked on a scanner and it does richen up the fuel mixture a little? how much I'm not sure. I got mine for under $200 and it works grate! I'm not sure of the Hp differences but I've seen a Camarro with an LS1 gain almost 8Hp on a dyno by installing one! so they have to do something!

Ps. I also have my intake work done!

[3400-95-Modified]

I have a 95 Buick ecm that I’m fitting into my car, and this sounds like an issue I'm having, When the car is at WOT the computer goes lean... I am using a 99 3400 MAF for my application and not the 95 Buick one that is part of the TB... What tables do I want to modify in the ECM to fix the too much air problem that it seems like I am having? I am using tunercat software to do my tuning. If you need a table list for the ecm I can get one too.

[AaronGTR]

Yeah, but supposedly they say the MAF has been calibrated for the car, so no need to tune. FYI, the vette already had the ECM tuned.

Yeah, they can't perfectly calibrate it though with the precision that you can change things in the pcm. Lot of people on the grand am boards tried them and sometimes it would be close enough to work, but other times people would have idle issues, hard shifting, and other problems with them. The new MAF doesn't have a screen like the old one does, so if their intake wasn't perfectly straight and smooth they'd get air buffeting and throw the signal off. None of those people ever actually dyno tested the MAF either and very few scanned with it in. They just imagined they got a HP increase from the placebo effect. Many of them were still using stock 56mm TB's too with the huge MAF.

I have a used one I bought from someone (LT1 MAF recalibrated for grand am with CAI) and I intend to dyno test it with before and after from the stock MAF using the same intake and filter for accurate results. I also plan to dyno and scan it after making changes to the MAF table in the pcm, and I'd like to do the same to an NA car with that MAF if I can find a volunteer around me.

[sprucegagt]

Yeah, but supposedly they say the MAF has been calibrated for the car, so no need to tune. FYI, the vette already had the ECM tuned.

Thus the reason why the vette lost power. When MAF manufacturer's say its "tuned for the car" they really mean is, we changed the frequency response of our MAF vs your stock unit. It makes your ECM think its receiving more air, than what is there.

Since the vette had a tuned ECM, its MAF table was already tweaked with the stock MAF. Changing the MAF mean't needing the corresponding MAF table to go with it.

[SappySE107]

If you have a straight tube before and after the MAF, you can remove the screen AND recalibrate it to gain power and keep drivability and gas milage. Tuning is the key to this though.

[dohcfiend]

tuning aside, upgrading to a bigger MAF sensor isn't really worth it unless you have run out of bolt-on's or are running boost.

in either case, i think you'd be better off getting a 85mm ls1/ls2/ls6 MAF off of ebay and buying/tuning that as it is a ton cheaper than the granatelli one.

[tejohnson]

I fully agree. I was running a stock MAF up to 11 PSI, and coulda pushed a lil more.