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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 07-24-2011, 06:06 PM   #1
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Weak MAF

This was from Vararams web site.

The Air Meter


During our testing we discovered a disparity between identical Camaros in terms of there reaction to changes in airflow and weather conditions.

We noticed that one car would be finicky at cold start and the MAF would scale "weak" while others would be strong and clean.

What we discovered was that the 'WEAK" meters were reading 1560-1670HZ at idle with the A/C off (OEM is 1800MHZ+)
During on road, light throttle input the MHZ would be slow and weak to respond to throttle changes (hesitation)
Wide open throttle showed 120-170MHZ lower than OEM stock (OEM is about 8600MHZ) on the same car.

Weak Meter Fuel trims-
The fuel trims would go to -15% using a VR -3% for a panel filter and -5-8% for other intakes. MHZ would drop as would the idle. When the MAF scaled in at WOT each would richen up accordingly.

Test 2 we pulled the filter from the VR completely, this resulted in fuel trims dropping down from -15% to -24%, MHZ dropped another 70-90MHZ. The car would drive fine but WOT operation was basically weak/flat and timing was low etc...
Now with one simple meter swap which takes about 1min the car immediately corrected, went back to 0% fuel trim MHZ jumped back to 1800+ all within 30 seconds! The car drove like a Rocket!

We began final confirmation by swapping air meters in cars and doing volt meter testing in static conditions. 30 meters, 3 cars = the same exact result every time. We confirmed this with VR customers tuners around the US.

The Result is that these 'weak" meters are not showing the same resistance levels as the majority of OEM meters.

This lead us to contact the GM rep and the actual manufacturer of the meters (its not Dephi) They confirmed the factory which allow us to identify each meter.

These numbers and letters are located on the back of the meter as shown.

(WHAT TO LOOK FOR) The factory code.




The suspect meters have all consistantly had a single letter located in this area VS a number with a letter.

Here is the catch 22

If the airflow is not changed by a substantial amount (our flow testing verifies that most of the aftermarket boxes do not) over OEM then the meter will be within OEM Tolerance but will always be "weak"
you cannot tune this out, its a fundamental issue with the resistance of the meter. It needs to be replaced. This is why some cars are finiky and some are not.

We have made arrangements through our GM parts dealer to stock meters just for this purpose.
We will be selling them at our cost (no markup at all)

You may not need the meter, estimated 90% will not.

"This meter is also used in the Corvette as well and some of those as of 2010's are starting show up"

Thank You Vararam, For constantly bettering the camaro Experience.
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Old 07-24-2011, 06:12 PM   #2
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Good stuff.... but the Vararam write-up has already been kicked around in a few other threads recently... All of their hard work really paid off..
http://www.camaro5.com/forums/showthread.php?t=160124

http://www.camaro5.com/forums/showthread.php?t=155915
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Old 07-24-2011, 06:16 PM   #3
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Good stuff.... but the Vararam write-up has already been kicked around in a few other threads recently...
And with all that attention, I think he is just trying to give credit where credit is due. I too thank you Vararam.
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Old 07-24-2011, 06:18 PM   #4
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And with all that attention, I think he is just trying to give credit where credit is due. I too thank you Vararam.
yep... you quoted me before I added the last sentance... Those guys support our club here big time and are awesome...
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Old 07-24-2011, 06:19 PM   #5
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yep... you quoted me before I added the last sentance... Those guys support our club here big time and are awesome...
Oh, I didn't know they did that. Well, I can't say I'm surprised.
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Old 07-24-2011, 06:23 PM   #6
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Oh, I didn't know they did that. Well, I can't say I'm surprised.
Yes I probably should have listed them in the article on the Home page... They were a huge part of our $7,000 donation to Kids Harbor and were right with us both last year and this year handing out sponsored trophys and donating CAI's to our raffle.

We could not do things like this without companies like Vararam...
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Old 07-24-2011, 06:40 PM   #7
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I think we need to add this info as a sticky
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Old 07-24-2011, 06:43 PM   #8
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I think we need to add this info as a sticky
Ofer, that is a great idea!
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Old 07-24-2011, 09:14 PM   #9
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I think we need to add this info as a sticky
There are already nine other pointless stickies that take up half a page of space.
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Old 07-25-2011, 02:10 AM   #10
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I think we need to add this info as a sticky
Not that I don't think this is good info but if we can't get the Jannetty CAI shootout thread made into a sticky, I don't know what qualifies as one. Hell that MIGHT cut down on the number of "what CAI is the best" threads. I say might cause if these guys refuse to use the search button, I doubt they pay much attention to the stickys.
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Old 07-25-2011, 11:30 AM   #11
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I checked today and was good to go. This web site is better than having a shop manual for my Camaro!
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Old 08-06-2011, 09:58 PM   #12
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Went to help a member today install some mods and we looked at the MAF and its one of the single letter only MAF, time for a new one.
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Old 08-06-2011, 10:30 PM   #13
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Went to help a member today install some mods and we looked at the MAF and its one of the single letter only MAF, time for a new one.
It makes a difference for sure, I found that out first hand.
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Old 08-10-2011, 06:23 PM   #14
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where exactly is the this air flow thing, MAF, or whatever it is? How do I check mine? I am having the same issue.
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Old 08-10-2011, 06:29 PM   #15
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where exactly is the this air flow thing, MAF, or whatever it is? How do I check mine? I am having the same issue.
The MAF (mass air flow) sensor is on your intake tube. The picture below of the stock intake shows the position of the wiring harness connected to the sensor. The sensor is removed with a couple of screws. To understand more about the various sensors on the car and what they do, take a look at this blog post.
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Old 08-11-2011, 05:50 AM   #16
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Thanks, I'll check it this weekend. I'm scheduled to get a Blackhawk CAI soon. This will replace that, right?
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Old 08-11-2011, 08:02 PM   #17
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Mine says K18...So I'm good to go right? Or is it a 'weak' one?
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Old 08-11-2011, 08:09 PM   #18
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K18 is a good one, I do believe.

Cheers
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Old 08-12-2011, 01:20 AM   #19
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I have a weak one. Where do I purchase the strong one, and use the weak one as a paper weight?
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Old 08-12-2011, 05:11 AM   #20
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Ok I want to make sure on this. I got a new one since my old one only had 1 letter. My new one which is already in my car had a letter and a number. That should be a good one right? Somebody keeps saying they have to have 3 characters.
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Old 08-12-2011, 05:17 AM   #21
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Quote:
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Mine says K18...So I'm good to go right? Or is it a 'weak' one?
Your MAF is good to go. A letter followed by a number is "strong".

Quote:
Originally Posted by 310Driver View Post
I have a weak one. Where do I purchase the strong one, and use the weak one as a paper weight?
Give us a call.

Quote:
Originally Posted by Scott@Bjorn3D View Post
Ok I want to make sure on this. I got a new one since my old one only had 1 letter. My new one which is already in my car had a letter and a number. That should be a good one right? Somebody keeps saying they have to have 3 characters.
I don't think I have seen a letter followed by a single number before. What is the code?
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Old 08-12-2011, 06:09 AM   #22
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I installed a CAI inc system yesterday and my MAF has a single letter "W" on it. Do i need a new MAF? I have an LS3. Will it make a difference?
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Old 08-12-2011, 03:25 PM   #23
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I installed a CAI inc system yesterday and my MAF has a single letter "W" on it. Do i need a new MAF? I have an LS3. Will it make a difference?
That is a "weak" MAF. If you are not having any issues then you don't "need" one. If you take any additional steps to improve air flow you probably will though.
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Old 08-12-2011, 03:44 PM   #24
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That is a "weak" MAF. If you are not having any issues then you don't "need" one. If you take any additional steps to improve air flow you probably will though.

Thanks, just spoke with Paul and ordered one from you guys. I will probably end up needing it based on what i have planned
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Old 08-12-2011, 04:46 PM   #25
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Thanks, just spoke with Paul and ordered one from you guys. I will probably end up needing it based on what i have planned
Awesome. Thanks for your order.
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