Ok...Ive posted up my mod list in a couple of different sections for different reasons and Ive been told by a few people that I need to ditch my Granatelli MAF. I did a bunch of searchs and found out why. The Granatelli was one of the first mods that I did to the car. (started out with bolt-ons) Anyhow, again, Im posting my mod list and what I wanted to know is which MAF will best work for my mods? From what Ive read, the stock MAF is good for 450 rwhp, but then how can you base it on rear wheel hp because that will vary upon drivetrain loss. (tranny, clutch/converter, driveshaft, rear end, etc.) I dont know what my car puts down to the wheels, but it has roughly 490 motor hp. I came up with that number because my car was on the dyno back in April of '03 when it was a 6 speed and many mods ago. So from all that Ive read, I need to get rid of it, but what is the best thing to replace it with for my mods? Thanks.

Fast Toys ram air kit
K&N air filter
Texas Speed & Performance air lid
Granatelli MAF
SLP high flow bellow
Bauer Racing ported & polished throttle body
LS6 intake manifold
NGK TR-55s
Holley 9mm wires
Kooks 1 3/4" stainless steel long tube headers
Custom 3" true duals w/Dynomax bullets dumped
ASP underdrive crank pulley
Meziere electric water pump
MTI C2 cam (224/.581/112) Plan on changing soon!
Manley valvetrain kit
AMW oil catch can
Billingsley ABS delete block
Century 200-4R w/all options
Yank PT4400
TCI flexplate
Hal shocks in a 4 corners w/R series in front
Spohn-LCAs, PHB, TA, SFCs, & 25mm rear sway bar all in chromoly
BMR-K-member, upper & lower a-arms, & relocation brackets
Airlift airbag
Prothane motor mounts
Energy Suspension tranmission mount
Denny's nitrous ready driveshaft
Strange 12 bolt w/4.10
Bogarts-15x10/ET Drags 15x4/165R
Wolfe chromoly 6 point weld-in roll bar
Weight reduction
MTI tuning (havent had a tune since April of '03)

 

From what I've heard, the GMAF itself is not bad- it's just more difficult to tune with than a stocker.

As a single bolt-on item on a near stock car it should work fine. As a MAF for a cammed, tuned setup, the stocker may be better.

 

Well after reading thread after thread, I dont want the Granatelli in my car. As soon as I figure out which one best belongs in my car, I will put it in. The Granatelli is already in my parts for sale list. I just wanna make sure that I put the right one in. I dont have any MAF to put in, so I have to buy one regardless, but I wanna buy the right one.

 

A nice -plan for the future- MAF would be a Z06 MAF. You can pick one up at PACE which is already ls1 calibrated.

 

What do you mean by "plan for the future?"

 

The Z06 MAF is 85mm.
If you ever decide to go with a larger 90mm intake manifold, the 85mm MAF is the way to go. Either way, it flows more than the stock MAF.

 

I do plan on using the FAST 90mm intake and throttle body, but not any time soon because thats a lot of money I have to start saving. Is the Z06 MAF the only 85mm MAF? Also, is the Z06 MAF youre referring to an OEM unit? Im sure the bigger MAF flows better than a stock one and Im sure my Granatelli does as well, but I concluded that its not just about the flow, its about the tuning.

 

The 85mm MAF is really "the" MAF for GM V-8 applications,
only the F-bodies and Holdens used the "Oreo" MAF on a
V8.

If you got ahold of HPTuners you could either work on
making a proper MAF calibration table for your Granatelli
(thus not having to buy another MAF, but having to do
the work in figuring out the GMAF flow/frequency; forget
any help from GMS) or you could substitute in the MAF
table from a 6-liter truck and be good to go with the
>non< LS1 calibrated Z06, or stock screened truck MAF
or (my way) a $40 truck MAF odd eBay with the screen
punched out.

You don't want the "calibrated for LS1" MAFs, SLP or
Pace, those are just resistor-bent truck Delphi MAFs but
your idea of "good enough calibration" is probably closer
to GM's, than theirs.

 

Which ever MAF I decide to go with, Jason at MTI will be tuning it. I dont have any of the tools to make computer adjustments. From the dyno graphs Ive seen, most of those bigger cams in stock headed/bottom end cars are pushing around or even more than 450 rwhp. I dont know where I'll stand when I do upgrade to one of those bigger cams, but I want to be sure that there is no restriction in my intake. What do you think is the best option for me? Im not a newbie here, but I have not a clue to any of the tuning portion of this car, that is why I paid to have mine done. I wanna get rid of the Granatelli, isnt that the best thing to do? If so, I dont mind buying another one, I want to be sure my car has the right parts in it.

 

Free mod the stock one. Port and Polish

 

stocker, port and polish works great for me.

 

Porting the stock MAF puts you right back where
you are with the GMAF - mystery meddling with
AFR. BlackBeaSSt being A4, should really stick
with a MAF that tells the truth or make the tables
faithfully translate the lies, and fix spark and fuel
shot by the tables that are proper for those.

If the MTI guy has run across GMAFs before then
maybe he already has a proven MAF table for that.
Doesn't hurt to ask. He would certainly be able to
set you up with a Z06 table and the Z06 MAF can
be had from SDPC -> or gmpartsdirect for less
than an aftermarket MAF. If the GMAF uses a
standard 3-to-5-pin Delphi adapter you would be
able to reuse that, but that would take away from
resale. Probably better to go cut a pigtail off a
junkyard truck and solder up the MAF and its IAT
hardwired to your harness, clean. Bet you could
get the truck MAF and pigtail both, for $50 at a
local 'yard. '99-up V-8 Chebby pickup trucks in
Texas? Never find one.

 

jimmyblue: My tranny is non-computer controlled, does that make any difference because I know that the 4L60Es are? This may sound a bit odd, but sometimes too much info that is provided to me can totally throw me off and I will miss the whole point. All the technical info youre talking about that relates to the MAF I have no idea what any of that is or means. I know absolutely nothing about this, that is why Im relying on someone to tell me what to do, but the right thing. I have a little time to decide which one is best for my mods because Im waiting on my converter to get back to me.

 

I didn't notice that it was a non-stock trans. That
makes the issue purely engine tuning. In that case
I think you just ought to ask the MTI dude if he can
tune for the GMAF easily (incl. part throttle). If he
says yes then you can just let it be. If it is going to
increase your tuning expense or ruin the result (which
it need not, depending on the tuner and what they
have figured out) then I'd make the '02-up Z06 MAF
my next choice. Start with MTI and take their view
on it, is what I'd say.

 

The car has already had a tune and that was back in April of '03. He didnt mention anything about the MAF, but then again I dont know if he didnt mention it because I wouldnt know what he was talking about anyway. I remember reading in a search that I did in the external section that the calibration tables are unknown for the Granatelli. It seems that if Granatelli comes up, not to use it. Its not that big of a deal to switch, I kinda want to from everything Ive read. I rather have a good tune that my tuner is for sure on rather than making guesses and a somewhat decent tune. So my best option is to swap over to a ZO6 MAF 02 and up? Are we talking about a aftermarket MAF, an SLP optioned ZO6 MAF, or just the factory ZO6 MAF that came in the 02 and up ZO6s? Are the 00-01 different? If I buy a ZO6 MAF, Im going to buy it new. Where would be the best place to buy it? Will it require any modifications whatsoever, or does it slip right in, plug in, and is ready to go? Sorry for all the questions.

 

The only 2 that Ive come across from the sponsors are the ones below:

Middle of page:

http://www.ls1speed.com/catagory.cfm?catagory=induction

Direct link:

http://www.texas-speed.com/item_deta...?ProductID=271

 

i agree, get the 85mm. maf from a gm truck, unmodded, and get a maf table for that mf, it will be a lot easier to tune. you will be a lot happier.

 

cueball: I believe jimmyblue actually suggested that he would buy the ZO6 85mm MAF, but not sure if it has to be 02 and up or not even though he specified it. The only other years that I know of that ZO6s were made were 00 and 01. What threw me off is I found one on Speed Inc.'s website, but it specifies that its an 01 model. Not sure why though. Im not only concerned about tuning it correctly and easily, but getting the most performance out of the MAF. I rather buy one, spend a little more time on the tune, and get the most performance out of it, rather than buy one that takes little to no effort tuning for and get minimal performance.

 

Earlier on the 'Vettes started with the F-body style MAF,
switched to the 85mm 5-wire screened ('01) and then the
descreened "Z06" MAF in '02-up. The Z06 (with nobody's
messing with it) is good and has known tables; the trucks
are fine too but if you are inclined to pop out the screen
then you might as well buy the one that comes that way,
the price difference is pretty small.

Of course being a bottom-feeder I went with the truck
MAF and punched out the screen because those go for
near dirt on eBay. Same difference in the end, aside from
the money.

 

jimmyblue: I understand now, thanks for all the info. Makes total sense now. The only thing that I didnt quite understand was this: "The Z06 (with nobody's messing with it) is good and has known tables;"

and..."Of course being a bottom-feeder I went with the truck
MAF and punched out the screen because those go for
near dirt on eBay."

So where's the best (cheapest) place to get an 02 and up ZO6 MAF? Do any of the sponsors sell them?

Thanks again for everyone's help and to you jimmyblue for all your efforts.