Any power to be gained 85mm MAF vs. stock MAF?
12-07-2001, 11:53 AM
#21
TECH Senior Member
Re: Any power to be gained 85mm MAF vs. stock MAF? Remember, when changing MAF sensors you are NOT just changing the air flow potential of the MAF sensor. You are usually changing the fuel/air mixture and timing advance. IMO, this is where most of the gains come from.
What is in question in this thread is not if there are gains to be had from an 85mm sensor but rather if those gains are in any way due to the increase in flow potential (since we can tune any MAF to the same mixture and timing advance with a MAFT.)
Also, in my example we went from a PORTED standard GMS (that's much bigger than a stock MAF sensor) to an 85mm GMS. If I had started with a stock MAF sensor I think there would have been gains.
What is in question in this thread is not if there are gains to be had from an 85mm sensor but rather if those gains are in any way due to the increase in flow potential (since we can tune any MAF to the same mixture and timing advance with a MAFT.)
Also, in my example we went from a PORTED standard GMS (that's much bigger than a stock MAF sensor) to an 85mm GMS. If I had started with a stock MAF sensor I think there would have been gains.
12-07-2001, 01:35 PM
#22
Re: Any power to be gained 85mm MAF vs. stock MAF? I agree Colonel. When you calculate the area of the stock MAF with the divider still in place, it winds up being equivalent to a 65mm opening...sounds like a potential restriction to me. For what it's worth, I think a PORTED stock MAF flows plenty of air...something like 200 cfm more.
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2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
12-08-2001, 10:27 AM
#23
Re: Any power to be gained 85mm MAF vs. stock MAF? ttt
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
12-12-2001, 01:31 PM
#24
Re: Any power to be gained 85mm MAF vs. stock MAF? I just spoke with Jason at MTI and he said he was only seeing about 10 hp gain with a 85mm MAF versus a 75mm MAF on the 422 motors. He said he frequently saw less or nothing on a stock cube motor. He told me to stay stock (remove screen). He also added that lightly ported (just the center divider removed) or GMAF is all that should ever be needed on a stock cube motor.
12-12-2001, 02:46 PM
#26
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Re: Any power to be gained 85mm MAF vs. stock MAF? Let me throw out another variable. What about a stock MAF with Whisper ends? Whouldn't that suffice to increase air intake yet still allow adjustments with a MAFT?
