Pro-M all over GMS!

remberto · June 23, 2003

Some strong statements from Pro M. Does anyone have any further info on this "9% lean condition" noted below?

from http://www.pro-flow.com/General%20Motors/Warning.htm :

· Best Products, Inc./Pro M Racing is no longer associated with Granatelli Motorsports, (GMS).

· Legal action is pending.

· In the November 2002 time frame GMS started manufacturing its own LS1 mass flow meters. The GMS LS1 meter as tested on the Pro M flow bench indicated a 9% lean condition across the flow range. Please see attached flow data. This meter is not recommend because of this condition.

· Pro M does not want its individually calibrated units confused with the GMS uncalibrated units. Pro M will not honor any warranty claim as a result of using the GMS unit.

· Pro M stopped shipping all product to GMS March, 2003

· As a consequence, we believe GMS has started selling machined billet housings with stock LT1 electronics. Putting billet housings with stock electronics results in a 10% lean condition across the flow range. Whenever stock housing/electronics are modified by reducing restriction, electronic recalibration is necessary to meet OEM factory specifications and prevent this lean condition. OEMs and Pro M calibrate meters to assure proper functionality. We do not believe GMS has the capability to calibrate meter electronics, and if they do not, GMS meters cannot consistently perform nor will they meet California Emissions.

· Ask GMS for proof they are 50 State Legal, because we believe they are not. The only 50 state legal meter that we know GMS sold that were 50 State legal were the units manufactured for GMS by Pro M.

· CALIBRATED, DYNOMOMETER TESTED PROVEN UNITS ARE STILL AVAILABLE DIRECTLY FROM PRO-M AT FAR MORE COMPETITIVE PRICES AND HAVE THE SAME 90 DAY GUARANTEE AND LIFETIME WARRANTY AS THE REST OF THE PRO M FAMILY OF PRODUCTS.

bigtruck21 · June 24, 2003

Thanks for the tip, I was thinking about getting a cold air intake from granetelli because it seemed like they knew their sh!t, but i think i'll pass on them for now.

greyghost03 · June 24, 2003

I actually thought of buying a Granatelli MAS off ebay a while back. Looks like it's a good thing I didn't. The stocker works just fine- even with the screen (that's put there for a reason) IMO.

Thanks for the info.

remberto · June 24, 2003

ok, so here's the real interesting part - hehe. here's a link from Pro-M that charts the 9% lean condition and error: Pro-M - MAF comparison

now here's one from GMS: GMS - MAF comparison

isn't this funny! these boys are really going at each other. so anyways a closer comparison of the 2 graphs leads me to believe that the original belonged to Pro-M. Reason: 1) the deviation arrow on the right seem like they actually point to the error in question (which is the whole point of the graph). 2) the Pro-M caption seems to be a technical explanation backed with some data they found - the GMS caption sounds like a marketting schpeel.

anyways, it's just my $0.02... you decide.. it's kinda funny actually..

greyghost03 · June 24, 2003

isn't this funny! these boys are really going at each other. so anyways a closer comparison of the 2 graphs leads me to believe that the original belonged to Pro-M. Reason: 1) the deviation arrow on the right seem like they actually point to the error in question (which is the whole point of the graph). 2) the Pro-M caption seems to be a technical explanation backed with some data they found - the GMS caption sounds like a marketting schpeel.

Yup! "wanna-bees" , "dead rich feeling" Man the gloves are off now!

Kinda sounds like Gran. is slinging the mud.

cowboy02 · June 24, 2003

Proof that anyone can make a graph........

However I would have to take the word of actual people that have used the product over the graphs..........

bdog2002 · July 8, 2003

look at the comments I have made in the product review

Y2K Silverado · July 8, 2003

Well I have a GMS-c maf (cold air version) and it works like a champ. I also have an HPP, I use the GMS maf and no HPP tuning (just shifts points, etc) and the truck runs better in the configuration than it did with the HPP 93 tuning and the stock maf. I've tried using the HPP tuning and the GMS maf, but the truck isn't as quick as with no HPP tuning and just the GMS maf. My feeling is that it works.

Jim

Tucson_02Silverado · July 8, 2003

With either graph, it would indicate that the stock MAF would also be causing nothing but trouble. Yet it doesn't, so I'll conclude that both of them must be full of it.