MAF Signal Drop-Out ??
Thread Starter
Drifting
Joined: Dec 2006
Posts: 1,279
Likes: 14
From: Houston Texas
MAF Signal Drop-Out ??
The sales pitch for the LPE 100 mm MAF says it..."solves the mass air flow signal drop out problem found on 2005-2006 C6 Corvettes that occurs under high air flow conditions."
anybody dealt with this "maf signal drop-out" and have some details / insights ??
i reposted this in scan and tune..thinking that would be more appropriate... please excuse the redundancy.
anybody dealt with this "maf signal drop-out" and have some details / insights ??
i reposted this in scan and tune..thinking that would be more appropriate... please excuse the redundancy.
Last edited by C5ZEE06; Dec 8, 2007 at 02:31 PM.
Instructor
Joined: Jun 2000
Posts: 121
Likes: 0
From: Decatur Indiana
MAF Issues
Just an FYI, on E40 pcm equipped 05 Corvettes and other vehicles, there is a math processing error as the MAF approaches / exceeds 11400hz. This has been seen to result in incorrect fueling at high loads associated with maxing out the MAF. The LPE 100mm MAF allowed the airflow frequency numbers to be lowered, for the same mass flow, such that this problem did not occur. This product was utilized prior to the tuning software patch being developed by EFI Live and HPTuners. So yes it did fix a problem, now however, there are other ways to resolve the calculation issues with the E40 based controllers. It does flow more air too.
Graham
Graham
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
In HPtuners, the patch raises the fail frequency from 13,500 to 15000 and allows some use with dry nitrous applications. I couldnt get mine to richen up until I did the patch. Anyone with a 2005 that I tuned has the patch done.The LS7 MAF has some better options for pre-2008 cars (not including Z06's). The Halltech assembly accepts the LS7 maf element and costs 70 bucks. Users of the Vararam can use the LS3/LS7 version and buy that element for use with 2005-2007 cars. The tune then gets the base Z06 MAF tables to be tuned. The MAF table must be used for the MAF to work. Both options get you an air cleaner and bigger 100MM+ maf for 500 bucks. On high power motors is worth double digit gains.
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Just an FYI, on E40 pcm equipped 05 Corvettes and other vehicles, there is a math processing error as the MAF approaches / exceeds 11400hz. This has been seen to result in incorrect fueling at high loads associated with maxing out the MAF. The LPE 100mm MAF allowed the airflow frequency numbers to be lowered, for the same mass flow, such that this problem did not occur. This product was utilized prior to the tuning software patch being developed by EFI Live and HPTuners. So yes it did fix a problem, now however, there are other ways to resolve the calculation issues with the E40 based controllers. It does flow more air too.
Graham
Graham
I am I on the right wave because I think that is what C5ZEE06 is asking.
Instructor
Joined: Jun 2000
Posts: 121
Likes: 0
From: Decatur Indiana
Good info, but I have to admit that I don't have a clue what you are saying because I am a "sales" guy that hires engineers. but I guess the question is does the average person need to buy this? If you have CAI, exhaust and a tune, it sound like the tune fixes it without requiring the part.
I am I on the right wave because I think that is what C5ZEE06 is asking.
I am I on the right wave because I think that is what C5ZEE06 is asking.
But it does flow more air and is used as part of the CAI system as the Halltech product and other options mentioned in previous thread.
Hope this helps to clarify.
Graham
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
I guess my use of the english language must be lacking, because I thought I had answered that. In that yes it worked to fix the issue on the E40 equipped vehicles, now there were ways to do it in the tune.
But it does flow more air and is used as part of the CAI system as the Halltech product and other options mentioned in previous thread.
Hope this helps to clarify.
Graham
But it does flow more air and is used as part of the CAI system as the Halltech product and other options mentioned in previous thread.
Hope this helps to clarify.
Graham
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Tech Contributor
Joined: Mar 2003
Posts: 12,094
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
It requires 2 pushes of keyboard buttons and you type in 15500 in another field when you get a tune done. Anyone with a tune in the last year should have it already. As far as airflow it wont show on a dyno until 450rwhp. A friend of mine got the Lingenfelter piece on his stroker and he went from 510rwhp to 531 with no other changes.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
A brief description:
http://www.hptuners.com/products/vcmsuite_enhance.php
Last edited by SpinMonster; Dec 9, 2007 at 10:24 PM.
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
runutzzz is 2 bar with the MAF enabled. MAF patch done. It likes to intermittently throw a MAF code under heavy accel. Pretty early in the rpm range. It def is not maxing the MAF, or no where near it. Happens around 9000 hertz. Very intermittent. I thought we had it cured months ago, and Rob just told me a couple weeks ago it happened again.
Doesnt do it in SD, obviously.
Doesnt do it in SD, obviously.
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
Here's what I did, Charlie Williams of RPM motors, did a Speed Density tune on my 427 motor. It really smoothed out the idle, and picked up some more torque. By doing this I no longer need the Maf, except for the IAT sensor. I fixed that problem by getting one form a early model C5 and mounting it into my air bridge, and splicing the wire to the two brown wires in the harness. It looks factory and it works. No MAF issures ever again. The added perk is the connecting tube from the air bridge to the TB is a full 4 inches. The inside dia of the maf is under 3 inches and then add the cross bar, and you can see what a restriction you've got. Anyway it worked for me.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
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From: Haymarket Virginia
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
Since it's a SD tune meaning there's no hot wire to cool which regulates fuel delivery in the maf, Charlie didn't say that I needed to retune it. As near as can figure, the only air that a SD tune is concerned about is the air density in the manifold itself. Not the rate at which it enters the manifold. If I had changed any of the motors parts heads, cam, manifold etc, then yes a retune would be in order. Which BTW is exactly what I'm planning on doing when the FAST 90 for the L92 heads becomes available. I hope it flows what they say it does. As for wheather changes, the position of the IAT is very close to it's stock location, within a few centimeters. There are no issues concerning temp. I asked Charlie and he said anywhere in the air bridge is fine. I located it at the end of the air bridge just before the start of the connecting tube to the TB.