What’s the general consensus on spending $280.00 on a Granatelli MAF feeding (cold air) to a ported throttle body, vs. merely de-screening the stock unit? I'm concerned with benefit for the dollar spent.

Thanks for any feedback!! GRT

 

VERY little, if any, benefit.

 

I'd suggest a Search for "Granatelli". That'll tell you all you need to know. They're junk.
Ed

 

On your 2001 NONE. Don't mess with the MAF unless your ready to do some tuning. I say that because,,, once you change the air flow through the MAF, (like removing the screen) you will effect the MAFs calibration ( that can be corrected when you get your car tuned) which will drastically effect your fuel economey. Your MAF is good for 550 HP as it is!
If you change the air flow through the MAF, it may add a little HP during Wide Open Throttle BUT,,,could negatively effect your mileage.

If I were you, I would install a bunch (as many as you could afford) MODs at one time and then tune with the modified MAF.

If you ever want to meet and discuss C5 stuff,,,,just let me know! Im only a few towns away! Im quite sure I can muster up a few more LOCAL C5 guys for A lunch DATE!!

BC

BC

 

How about a national meeting ..... if you guys can re-elect Senator Lieberman .... you're OK in my book ..... I'd do lunch with you guys in a heartbeat ....

 

Steve

If your ever in town, Im buying LUNCH! COME ON DOWN!
Bill

 

LoneStarFRC

Thanks for ypur input about the MAF. I”m convinced, and I agree with you, as does everybody else. Sorry I’m a little late with my response.
Regards, GRT

===========

Hi C5XTASY
Thank you for your input on the MAF, from the Land ‘o Lakes. Followed your suggestion, and everybody else agrees with you. Sorry I’m a little late with my response. Regards, GRT
Regards, Gerald Reilly Tischer
===========

Bill Curlee

Sorry I’m a little late with my response. Good advive on MAF, and well taken.
Getting together with a few guys is a fantastic idea. Last night I visited Scotty Green at his ‘tcb’ bar. He says he’s in.

For quite some time my biggest remaining question concerned the aquisiton of a cam, & corresponding heads. Talked to the Service Mgr of a major Chev dealership, who advised me not to bother. (He certainly can’t be accused of harboring ulterior motives, for advising me to save some major bucks.) Indeed my car already runs like a gazelle being chased by a leopard, but I’m still curious about what else is possible.

It seems that the majority of tuners charge $600.00. Thats a little steep. Is there anyone out there more merciful on the wallet?
Regards, GRT
===========

Hi, Z06Black

Sorry I’m a little late with my response about my MAF question, and thanks for your vote of confidence. National meeting sounds good,, but I think that the best venue for that would be at CM, Bowling Green KY, or at Carliele PA.

About Mr. Lieberman. I supported him for his stand on defending Israel, no matter what. Indeed, I’m not even Jewish, I’m German. My stand is not derived from any Houlocaust guilt, or crap like that, but from common sense and a sense of justice.

Then I supported Lieberman for supporting the President on Iraq, where the Presient seized the opportunity to rid the world of one more Adolf Hitler, and thus made the world a little cleaner. Again, Lieberman’s interest here was obviously no more than that Israel was threatened.

My interest in Lieberman ends here, because he’s shown himself to be quite a chameleon.
Regards, GRT

 

The MAF is not the restricting point on your motor until after 500+hp as Bill Curlee noted. Stock MAF's require less tuning and often are more reliable than the Granetelli's. On some FORD's where you alter your MAF when you change injectors since you can't tune for injector size, the Granetelli's are one of the best options.

Tuners, you get what you pay for. Good tuners are $300+ for a solid tune. Yes, there are many options available. Most tunes can net 10+rwhp on a dyno, even on a stock motor.

Bang for the buck, a cam+heads will give you HUGE gains with a tune (100+rwhp). If you want PEP, gears are a good option at the expense of a little fuel economy. Occasional fun, nitrous is also an option and is one of the most cost effective hp per dollar mods.

What are your goals? Remember, after approx 420rwhp you'll need to look into a new clutch (M6). If you have an auto, the tune will help add a LOT of pep regardless of mods.

 

Hi Billdog350.

Thanks for your response 6/27/08, regarding my MAF question. (Obviously I’m late, but I try to get back to everyone who has given me their time and advice).

Per your opinion, and that of others I shall forgo wasting my $$ on an aftermarket unit. As a matter of fact, Bill Curlee advised to leave the MAF Screen intact as well.

What good is a modest cam, or any cam, while retaining stock heads? None of the cam mfgrs RECOMMEND head flow #s to maximize the benefit of their various products. I have a (practically new) 2002 Z06 cam, that I’ve backed off installing under my stock 2001 coupe heads, because I think it’s a waste of time without the corresponding ‘02z heads.

Where can you find a tuner for only $300.00? Is that for a Dyno Tune? I keep hearing $600.00.

Regards, GRT - c5-pewter

cc: Bill Curlee

 

Guys what about a 85mm Z06 MAF? Any benifit from going to a 78mm to 85mm on a Head/Cammed motor? I know the 85mm's do not have the screen like my 78mm does.

 

The C5 2001+ MAF's do have the screen, but you can pop them out easy, and then it's a Z06 MAF. If you cal it you may see a bit. I would think you'll get better throttle response though. And it will help if you go to a 90mm TB and intake down the road.

 

Actually the 2001 Z06 (actually all cars got the 85mm for 01) MAF is screened .... GM eliminated the screen on the 2002 cars.

When you change your MAF (whether descreening it or going to a different size) you most likely will need to have your PCM "tuned".

The reason is that the MAF reports the "weight" (mass) of air by a "signal" (frequency) to the PCM. The PCM has a table in it that relates the frequency to the mass of the air.

An example .... let's say the MAF is sending a 1,000 Hz signal to the PCM ... the PCM looks in its table and sees that 1,000 Hz means that 14 grams of air flowed through in the last x amount of time (This is an example ... these aren't real numbers).

If you put a different MAF on, you need to hope that 14 grams will still generate a 1,000 Hz signal, but often times a different MAF will generate a different signal (say 900 Hz for 14 grams).

What a tuner does is "recalibrate" the MAF table in the PCM so that when the PCM gets a (say) 900 Hz signal the new table says "that's 14 grams", which would be correct.

Changing the MAF may or may not cause problems .... some people have changed them with no problem at all. Just wanted to make you aware.

The screen itself is not a big issue, where you will probably see a difference is in the increased size of the MAF ... Chevy touted the largr intake on the 2001 cars as a big reason for the 5 HP gain over the 2000 LS1 motor.