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View Poll Results: Granatelli (Pro-M) or Vortech (C&L) Mass Air Flow Sensor?
Granatelli (Pro-M)... 6 75.00%
Vortech (C&L)... 2 25.00%
Voters: 8. You may not vote on this poll

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Old 03-25-2004, 04:37   #1 (permalink)
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MAF opinions...?

Hello Ford fans,

I know this topic has been around for ages, but I am close to purchasing a mew MAF sensor and I cannot for the life of me decide between these two.

The Granatelli motor sport (Pro-M) item GRN-75955024-00, or,
The Vortech (C&L) item 8A301-023 (with 24# sample tube).

The GMS sensor do have electronics specifically designed for the injectors used, which is good for engine load and less hit and miss with calibration, but they donít look as stock as the Vortech ones and they cost half as much again.

The Vortech sensors donít have their own electronics and there calibration depends on the size of the sample tube, and have a tendency to run rich, but they do look stock like the EBGT/Sprint MAFs.

I will be fitting an Explorer intake, and I am going to fit the old H.O. engine cover over it for the stock look.
I will also be using a Kirban adjustable fuel pressure regulator and will get it tuned on a dyno.
I will be using some Bosch injectors (out of a magna) that are about 23.9lbs, which may offset the inherent rich condition the Vortech sensors have, but may throw the GMS calibration out a little.

What do you guys think? Is the GMS product worth the extra bucks?
Iíve been in two minds for ages and have to decide soon.
I might start a poll to make things easier.
Cheers to all who read this and respond.
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Old 03-25-2004, 04:49   #2 (permalink)
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Re: MAF opinions...?

I went through this a while ago and decided on the GMS unit and am very happy with it. The main problem with the Vortech/C&L MAF's is that they seem to be really hit and miss with their tuning. Some idle alright and some are a handfull without EEC modifications to compensate. The GMS ones are all calibrated and work out of the box like they should, but you do pay for it. Also, don't worry about throwing off the calibration of the GMS MAF with the Magna injectors because you will be able to fine tune it with the regulator anyway.

Also, I think the GMS ones look quite stock, except for being black. Here is a pic of mine installed http://www.fordgallery.com/showphoto...cat/500/page/1
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Old 03-25-2004, 05:01   #3 (permalink)
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Thumbs up Re: MAF opinions...?

Thanks EDXR8,
I always take your advice as gospel!
I will be ordering a few goodies from Summit soon so the price wonít be nearly as bad as the prices Iíve encountered in Australia.
I have seen your pics before and I have already purchased the alloy venturi because I thought your set-up looked so sweet!
Cheers!
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Old 03-28-2004, 05:59   #4 (permalink)
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Re: MAF opinions...?

im playing around with a GMS one for my ute, so far for what ive seen, it is very impressive, and a good rwhp gain...tho im still experimenting
better off to spend the extra$$ on the GMS, you will be happy!!
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Old 03-29-2004, 22:41   #5 (permalink)
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Re: MAF opinions...?

Well this isn't going to help your decision, as i went with the Vortech unit (for 19lb injectors however) and i have had good success with that. I have a reasonable idle, but have a different cam which might affect that somewhat.

I don't have a chip or adjustable regulator or anything, and the calibration seems fine (however i have never had dyno'ed to check properly). It gave a good gain in performance too.
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Old 03-29-2004, 22:58   #6 (permalink)
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Re: MAF opinions...?

I too put on a Vortec and noticed low and mid range torque increase.
Never had any problems with it.
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Old 03-29-2004, 23:44   #7 (permalink)
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Re: MAF opinions...?

Thanks for the replies people.... (Did you vote in the poll?)

This is getting back to what my original dilemma was all about in the first place.
I've heard some bad things about Vortech MAFs, but no one seems to have had a problem with theres here.

Is the GMS item worth half as much again as the Vortech item?
If the GMS MAF out performs the Vortech MAF by say 3hp or more and/or gives a better torque curve then I would purchase that.
If the engine can be dyno tuned to perform just as well with the Vortech as it can with the GMS, I will go with that.

Iím having trouble justifying the price difference compared to the performance difference.
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Old 03-29-2004, 23:53   #8 (permalink)
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Re: MAF opinions...?

I bought mine second hand from a guy on ebay in the US for a grand total of about $250 landed here.
If you go to stangnet.com you can find reviews from customers that have bought various items and you will find both good and bad comments about both.
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Old 03-30-2004, 02:43   #9 (permalink)
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Re: MAF opinions...?

I had a bit of a look at stangnet.com and came accross these links...

http://reviews.stangnet.com/review.cgi?ID=340

http://reviews.stangnet.com/review.cgi?ID=255

The worst comment for the GMS MAF was
"Pro M 75mm Bullet runs to rich at 5000 ft above sea level."

The worst comment for the Vortech MAF was
"I had it dyno tested at Steeda it actually lost 3H.P. compared to the stock maf.It and severly leaned the the mixture and had a lot of pinging.
They made 5 dyno runs trying to get it to perform.They recommended to remove it.

Guess its better to run rich than run lean!

I am leaning towards the GMS MAF just for piece of mind, as I'm only going to buy one once.

More comments are welcome!
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Old 03-30-2004, 06:36   #10 (permalink)
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Re: MAF opinions...?

One advantage with Vortech or C&l brand/type is the sample tube can be changed and NO reason to send it back for recal...As in GMS...
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