Little airflow experiment
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Little airflow experiment
I recently blew out the wires on my MAF due to a nitrous backfire.
Got a new MAF, everything else is fine.
Before I recall seeing 245 gm/sec on a Datamaster run. THis was with both screens and heat sink removed.
With new unit with screens and heat sink still intact, I got a reading of 195 gm/sec.
Using calculations from fellow forum member Mo Bandy, I see that 245 gm/sec = 453.6 CFM and 195 gm/sec = 361 CFM.
That's a fairly large difference. I'm gonna remove the screens and heat sink on my new one and log some more runs to see what the new MAF will yield for gm/sec @ WOT and compare to what it reads now.
I have...
383 @ 9.3 - 9.5:1
K&N filter with cut lid
Stock MAF (screens and heat sink intact for the moment)
58 mm tb
Super ram
Ported aluminum D port # 113 heads
Comp Cams 222/226 0.464/0.464 (I know very weak cam)
Hooker # 2149 through 2.5" dual exhaust, no cats to 40 series Flowmasters
What kind of gm/sec should I be seeing and what numbers are others getting?
Got a new MAF, everything else is fine.
Before I recall seeing 245 gm/sec on a Datamaster run. THis was with both screens and heat sink removed.
With new unit with screens and heat sink still intact, I got a reading of 195 gm/sec.
Using calculations from fellow forum member Mo Bandy, I see that 245 gm/sec = 453.6 CFM and 195 gm/sec = 361 CFM.
That's a fairly large difference. I'm gonna remove the screens and heat sink on my new one and log some more runs to see what the new MAF will yield for gm/sec @ WOT and compare to what it reads now.
I have...
383 @ 9.3 - 9.5:1
K&N filter with cut lid
Stock MAF (screens and heat sink intact for the moment)
58 mm tb
Super ram
Ported aluminum D port # 113 heads
Comp Cams 222/226 0.464/0.464 (I know very weak cam)
Hooker # 2149 through 2.5" dual exhaust, no cats to 40 series Flowmasters
What kind of gm/sec should I be seeing and what numbers are others getting?
Burning Brakes
Joined: Dec 2002
Posts: 1,088
Likes: 0
From: Lakeland fl
I think the difference is not the actual flow, but what the new MAF is reporting to the computer. Supplying the ECM with lower flow rates for an equivalent RPM/load will result in a less fuel given.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
What your seeing is you have messed with the calibration of the MAF by removing the screens. Or in your case, putting them back in.
Its tough to put a value on how far off you are. As I am sure its not a constant correction value across the boards. Probably scewed more at the higher flow values. And maybe 1-2 off down low.
Its tough to put a value on how far off you are. As I am sure its not a constant correction value across the boards. Probably scewed more at the higher flow values. And maybe 1-2 off down low.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
Based on threadsI have read here in the past, I, thought that gutting a MAF could improve airflow by 20%
Your numbers look about that difference. So I was not surprised by them. Are both the old and new MAF the same part number from the same manufacturer?
Your numbers look about that difference. So I was not surprised by them. Are both the old and new MAF the same part number from the same manufacturer?
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Originally Posted by ski_dwn_it
What your seeing is you have messed with the calibration of the MAF by removing the screens. Or in your case, putting them back in.
Its tough to put a value on how far off you are. As I am sure its not a constant correction value across the boards. Probably scewed more at the higher flow values. And maybe 1-2 off down low.
Its tough to put a value on how far off you are. As I am sure its not a constant correction value across the boards. Probably scewed more at the higher flow values. And maybe 1-2 off down low.
I have a question for you, so you say that if someone removes or puts back the screens on the MAF the computer will get false readings?
I had to buy a new MAF a few weeks ago, but I ran the car with the screens one for a little wile then ended up removing them.
Should I disconnect the battery for a few minutes and reconnect it to let the computer re-adjust itself the to new CFM values coming through the MAF? and should Black corvette do the same with his car?
Melting Slicks
Joined: Nov 2003
Posts: 3,375
Likes: 1
From: Northern CA
Originally Posted by SBNova
I think the difference is not the actual flow, but what the new MAF is reporting to the computer. Supplying the ECM with lower flow rates for an equivalent RPM/load will result in a less fuel given.
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