SLP or Granatelli MAF?

**NextBigThing** · 05-31-2008, 06:04 PM

Ok guys...any particular preference between a Granatelli or a SLP Mass Airflow Sensors? Besides price which the SLP is significantly cheaper compared to Granatelli...what makes one better than the other?

NBT,

**Benner** · 05-31-2008, 06:11 PM

Don't waste your time with an aftermarket MAF. The stock Maf will support around 500 hp. Plus alot of problems come about after installing the it seems. If your bound and determined to change it, I'd say get it tuned for speed density like mine is but, unless your planning ungodly power for it. ie over 500, i'd just leave the stock MAF

**NextBigThing** · 05-31-2008, 06:15 PM

Good info brother.....wouldn't have thought that..thanks!

NBT,

**Mr. Luos** · 05-31-2008, 06:29 PM

Stock > aftermarket when it comes to the MAF.

Rarely would I say that though.

**Y2KPewterSS** · 05-31-2008, 06:34 PM

Originally Posted by Mr. Luos

Stock > aftermarket when it comes to the MAF.

Rarely would I say that though.

x2

**nhraformula** · 05-31-2008, 08:25 PM

dont not fuck with the maf unless you want problems

**NextBigThing** · 06-01-2008, 07:43 PM

What are we talking about as far as problems? I mean I'm sure thousands of people have switched there stock MAF to aftermarket, is it that much of a possible problem?

**Mr. Luos** · 06-01-2008, 07:45 PM

Originally Posted by NextBigThing

What are we talking about as far as problems? I mean I'm sure thousands of people have switched there stock MAF to aftermarket, is it that much of a possible problem?

They are NOT properly calibrated.
To get the gains they claim safely you need a $450+ dyno tune for a $150 part.

The problem with the aftermarket ones is that they lean you out. Lean = power. But how far do you want to push it? The right circumstances could lead to a overly lean condition and piston damage (severe detonation).

**NextBigThing** · 06-01-2008, 07:51 PM

Good info my friend.....makes sense...Some potentially serious problems there!

**nhraformula** · 06-01-2008, 08:05 PM

Originally Posted by NextBigThing

What are we talking about as far as problems? I mean I'm sure thousands of people have switched there stock MAF to aftermarket, is it that much of a possible problem?

if you used the "search" feature you wouldnt even be asking

**NextBigThing** · 06-02-2008, 05:07 AM

Originally Posted by nhraformula

if you used the "search" feature you wouldnt even be asking

**nhraformula** · 06-02-2008, 06:38 AM

Originally Posted by NextBigThing

**SSTODD** · 06-02-2008, 07:46 AM

I have an SLP one for sale if you can't wait to throw lean codes.

**jamessr** · 06-03-2008, 08:00 AM

All I did was clean mine...
Having said that I know why they claim 5-20 HP increase. Its because the new ones are clean. Your stock one will do just as good, and the results from cleaning your stock one is awsome.

**punisherTA** · 06-04-2008, 06:56 AM

I removed the comb from my stock MAF and called it a day. After I did the heads and cams the MAF table in the PCM needed some tweaking because of it though.

**INMY01TA** · 06-04-2008, 05:33 PM

I had a Granetelli years ago when I first bought my car. It's a POS! Listen to NHRAFormula and don't be a douchebag.

**nhraformula** · 06-07-2008, 06:16 PM

Originally Posted by INMY01TA

I had a Granetelli years ago when I first bought my car. It's a POS! Listen to NHRAFormula and don't be a douchebag.

maf is such a newbie mod and i fell pray to it 7 years ago.
i went threw 3 granetelli MAFs and every one of them threw codes.
i put the stocker back on and zero problems.

**Granatelli** · 07-14-2008, 08:42 AM

I just came across this thread; I just wanted to address a few points.

1. Granatelli MAFs are 50 state legal, in order to pass California emissions standards the meter has to be calibrated to within 1/10 of 1% variation from the factory unit. Therefore you should not be getting a lean code just by installing a GMS MAF
2. Granatelli works directly with DELPHI and HITACHI to design and produce OE standard meters. To say that our meters do not work is to say the stock meter does not, as they are designed and calibrated on the same machines daily.
3. Granatelli does offer a MAF that competes directly against the SLP unit and it is priced the same - $189.00 - http://www.granatellimotorsports.com...ay.php?gid=169
4. The benefit of any aftermarket MAF is increased laminar airflow. http://en.wikipedia.org/wiki/Laminar_flow what that means simply put is that the GMS meter can and will allow the engine to ingest more air with less effort just like a clean air filter will over a dirty one. When someone says the stock meter will flow enough power to support 500hp that may be true but you would be leave a ton on the table. That is like saying you would rather breathe through a cocktail straw then a garden hose just because you can.
5. Likewise we sell and support LS1Edit, EFI Live and HP Tuner. I understand the trend to go to MAF-less but it backwards thinking - Here is a video of my Twin Turbo LS2 using the GMS 350119-C MAF http://www.gmsvideos.com/video/6197 this was tuned using EFILive and the GMS MAF. It idles and runs like stock until you stand on it. The MAF is instrumental in making that happen
6. Lastly, Granatelli wants to support everyone in the endeavors to make the most power they can but our real customer, the people we support day in and day out is the enthusiast that is looking for a bit more power and not wanting to get married to the local dyno shop. Hence bolt it on and it works
7. If ANYONE has a problem with GMS we have a staff to support you. When we read that a person had more then 1 issue with our product on the same car – we get alerted to fix it immediately

**WS6ICK** · 07-14-2008, 09:23 AM

The Granatelli MAF was the first bolt on upgrade I did when I first got my car back in 2005. Now I have heads, cam, headers upgrade and it was hard to tune with the aftermarket MAF. Yes they let more air in but it gives the PCM the wrong reading and causing it to run lean. I had big issues with tuning until I put the stock (untouched) back on.

**Granatelli** · 07-14-2008, 09:36 AM

Originally Posted by 2000taws6

The Granatelli MAF was the first bolt on upgrade I did when I first got my car back in 2005. Now I have heads, cam, headers upgrade and it was hard to tune with the aftermarket MAF. Yes they let more air in but it gives the PCM the wrong reading and causing it to run lean. I had big issues with tuning until I put the stock (untouched) back on.

The MAF transfer functions should have matched - when ever a tuner has trouble with our meter all they need to do is call and we can flow and send them the transfer functions.

Also we offer the F-body guys the option to upgrade to the 85mm style meter found on the later model car - This also brings up a great point to oppose that of Benner - He claim the stock meter will support 500 - When GM wanted more power from the 2001 and up Vette as well as the Z06 their first change was to the 85mm style meter. They did this to let teh engine breather (or ingest) air better.

But with all the said - I fully understand what you are saying - I just think with a phone call we could have helped you