 GM MAF Flow rates? |
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 Oct 20 2005, 08:44 AM
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#1
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DSMCentral Godfather  Group: Admin Posts: 3,823 Joined: 10-January 01 From: Washburn Member No.: 26  |
I recently had a discussion with Natedogg concerning the GM MAF. From what we had heard the 3" MAF is only good for up to 800CFM. Some of the turbo upgrades going on around here will pump more than this figure. So the 3.5" MAF has been employed.
In a recent discussion with Dejon though, he said that the 3" MAF is good for far more CFM in a 'Blow Through' set-up. I currently have a 3.5" GM MAF with 2.5" blow through piping and 3" couplings. I can either get a 3" MAF or the couplings flared for my 3.5" MAF. Does anyone have definitive numbers on the GM MAF's flow numbers, draw-through and blow through? -------------------- In Loving memory of David T Crebo
Greatness comes from the most unexpected places!  |
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Oct 20 2005, 09:05 AM
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#2
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
Stock 94-up LT1 MAF Sensor w/o screen -- 719.0 cfm
http://dtcc.cz28.com/flow/ It only has that one so I'll have to keep looking for the LS1 sensor. -------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Oct 20 2005, 10:03 AM
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#3
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Person of Wisdom Group: Members Posts: 111 Joined: 9-December 02 From: Peoria, IL Member No.: 52 |
The MAF will flow considerably more in a blow-through setup. You might want to surf some LT1/LS1 Camaro boards and see what kind of power numbers they are putting down running blow-through turbo setups with stock MAF's.
Ideally you want the piping to be close in diameter to the MAF to avoid cross-sectional area changes that will introduce turbulence at the sensor, which is bad for sensor accuracy. The 2.5" piping should become a flow restriction before the 3" sensor does, so I think the important thing is how high can the 3" MAF read before it maxes out? Marty |
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Oct 20 2005, 10:07 AM
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#4
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 Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
QUOTE (RacerX11 @ Oct 20 2005, 10:03 AM) so I think the important thing is how high can the 3" MAF read before it maxes out? Marty That is exactly what I was referring to with the 800 cfm per minute number. I believe I got that number from fullthrottletech.com. The guys who created and support the GM MAF translator. But now I can't seem to find it. It might be on the older yahoo groups translator list. |
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Oct 20 2005, 10:49 AM
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#5
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DSMCentral Godfather Group: Admin Posts: 3,823 Joined: 10-January 01 From: Washburn Member No.: 26 |
Hmmm...Ok. Good info so far. I apparently asked the wrong question.
Can we get some definative numbers on what each GM MAF sensor will read as Nate and Marty mentioned then. -------------------- In Loving memory of David T Crebo
Greatness comes from the most unexpected places! |
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Oct 21 2005, 11:52 AM
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#6
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Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
Did some searching around on LS1tech.com. Came up with this:
QUOTE Also stock 75 mm MAF supports up to 750 CFM and most engines only require a max of 650 CFM so engine does not need any more air, it does need more fuel in most cases. 75mm maf = 3" maf 85mm maf = 3.5" maf From last post in this thread. http://www.ls1tech.com/forums/showthread.p...ghlight=maf+cfm |
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Oct 21 2005, 02:16 PM
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#7
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Person of Wisdom Group: Members Posts: 111 Joined: 9-December 02 From: Peoria, IL Member No.: 52 |
But is the 750cfm limit a flow limit or a sensor range limit? I have a couple contacts at GM...I will see if I can get some insider info on this.
Marty |
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Oct 21 2005, 03:05 PM
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#8
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Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
I'm not sure. This is all I could find that gave any kind of clear definition for cfm through the maf. Hopefully your contacts can clear this up.
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Oct 21 2005, 03:07 PM
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#9
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
The statistic I posted was for overall maximum air flow, not sensor maximum.
-------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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