When do I need a bigger MAF?
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,146
Likes: 10
From: Boise Idaho
St. Jude Donor '07
When do I need a bigger MAF?
I've just been reading a thread about weather I should descreen my MAF or not, and the benefits vs the possible problems. It looks like everyone is referring to a stock car, and they say that the stock unit is good up to a certain point.
So here's my question. I'm running a 383ci LS1 in my '99 heads, puts down about 450rwhp and 450rwtq. I'm also planning on running nitrous by next year. SO- do I need a new MAF? What should I get if I do, how do those 1000cfm MAF housings work? I see that Ecklers has the 1000cfm housings, but they also have a modified ACDelco sensor that is 1000cfm, and it says its been recalibrated.
Thoughts?
So here's my question. I'm running a 383ci LS1 in my '99 heads, puts down about 450rwhp and 450rwtq. I'm also planning on running nitrous by next year. SO- do I need a new MAF? What should I get if I do, how do those 1000cfm MAF housings work? I see that Ecklers has the 1000cfm housings, but they also have a modified ACDelco sensor that is 1000cfm, and it says its been recalibrated.
Thoughts?
Burning Brakes
Joined: Nov 2004
Posts: 988
Likes: 4
From: Livermore CA
99Lingenfelter,
I have an 02 Z with a Darton sleeved 440, with a medium cam 232/240 117. I was putting down around 525 with the stock 85 MAF and a Fast 90 LS2 90. The motor would start to flatten out around 6100 rpm. I had my EFI live virtual dashboard going and I could see that it was starting to build vacuum at that point indicating a restriction. I installed the Lingenfelter 100mm MAF and downloaded their cal files from their website. Started the car and it ran smoother throughout the light and medium throttle settings. WOT runs the engine would not quit pulling at all and slam into the rev limiter at 6500. Seat of the pants felt like an extra 30 or 40hp, it really pulls now and you run out of road really fast. I haven't had it back on a dyno. Sorry for the long answer to your question, but you will have to monitor your manifold vacuum at high rpm with the throttle wide open to know if you need a bigger MAF.
I have an 02 Z with a Darton sleeved 440, with a medium cam 232/240 117. I was putting down around 525 with the stock 85 MAF and a Fast 90 LS2 90. The motor would start to flatten out around 6100 rpm. I had my EFI live virtual dashboard going and I could see that it was starting to build vacuum at that point indicating a restriction. I installed the Lingenfelter 100mm MAF and downloaded their cal files from their website. Started the car and it ran smoother throughout the light and medium throttle settings. WOT runs the engine would not quit pulling at all and slam into the rev limiter at 6500. Seat of the pants felt like an extra 30 or 40hp, it really pulls now and you run out of road really fast. I haven't had it back on a dyno. Sorry for the long answer to your question, but you will have to monitor your manifold vacuum at high rpm with the throttle wide open to know if you need a bigger MAF.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,146
Likes: 10
From: Boise Idaho
St. Jude Donor '07
Sounds like I might need to get one of these EFI live virtual dashboard things. Looks like I might be needing a larger MAF also. Thanks for the post! Anyone else want to share?
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,146
Likes: 10
From: Boise Idaho
St. Jude Donor '07
Doesn't getting a bigger housing cause issues if the MAF isn't re-calibrated? Just seems like if you went from the stock housing with 640CFM to an aftermarket one with 1000CFM, the MAF would know how much air it would really be getting.
I've though about getting one of the 1000CFM housings from Ecklers. It would flow more, but I thought it might confuse the MAF.
Can anyone shine some light on this? Thx.
I've though about getting one of the 1000CFM housings from Ecklers. It would flow more, but I thought it might confuse the MAF.
Can anyone shine some light on this? Thx.
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
Doesn't getting a bigger housing cause issues if the MAF isn't re-calibrated? Just seems like if you went from the stock housing with 640CFM to an aftermarket one with 1000CFM, the MAF would know how much air it would really be getting.
I've though about getting one of the 1000CFM housings from Ecklers. It would flow more, but I thought it might confuse the MAF.
Can anyone shine some light on this? Thx.
I've though about getting one of the 1000CFM housings from Ecklers. It would flow more, but I thought it might confuse the MAF.
Can anyone shine some light on this? Thx.
Drifting
Joined: Sep 2004
Posts: 1,464
Likes: 7
If you change to the LPE 100mm unit they provide you with the programming for remapping your PE tables. The LPE is the only unit on the market I would consider, or the ZO6 85mm(for 1999-2000 models only, the 2001 came stock with this unit along with LS6 intake, and the 1997-1998 models PCM cannot be recalibrated correctly to work with either of these units) unit if you still had the stock LS1 unit.
OK so if you have a 97 or 98 what do we need to do?
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
The tables in the 97-98 pcm do not read the higher volume cfm that the LS6 MAF or LPE unit can meter. I do not know of a practical fix, only a pcm change, if that is even possible. Plenty people on here smarter than me, maybe someone else will chime in. Good Luck & Happy Independence Day 
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Le Mans Master
Joined: Apr 2001
Posts: 5,941
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From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
The stock Z06 MAF can support 600 rwhp NA. After that it becomes a problem. If you are using nitrous though you can make more than that as the nitrous makes up for air.
Drifting
Joined: Sep 2004
Posts: 1,464
Likes: 7
The tables in the 97-98 pcm do not read the higher volume cfm that the LS6 MAF or LPE unit can meter. I do not know of a practical fix, only a pcm change, if that is even possible. Plenty people on here smarter than me, maybe someone else will chime in. Good Luck & Happy Independence Day
