maf data logging question.....updated

Laughing Gnome · 08-22-2005, 04:49 PM

did some 3500 to redline logs to se if my maf was on its way out and the readings i got were a maximum of 132g/s at 4900rpm. Is this a sign that my maf is dying? replaced the maf and this this runs like new, man what a difference it made.

Ray Khan · 08-23-2005, 04:05 AM

so if your car is a stock 1.8T then that sounds ok.

AvantMnkyA4 · 08-23-2005, 01:28 PM

A400 · 08-24-2005, 03:40 PM

Ray Khan · 08-24-2005, 06:44 PM

a friend had it for when we tested her MAF and the numbers worked out right for a stock turbo car. I know if you convert turbo flow to g/s it should work out pretty closely.

Yippers® · 08-24-2005, 08:49 PM

http://forums.audiworld.com/vag/msgs/2800.phtml

A400 · 08-26-2005, 10:37 AM

Yippers® · 08-26-2005, 11:23 AM

For example, on the nDBW Stage III APR uses the OE MAF housing and MAS. They add a divider circuit to the chip and keep the OE 'map scaling'. So I see maximum MAF readings of around 230g/s on the 93 program. 230/.80=287

On the otherhand, PES/GIAC chose to work around the (~5v) OE MAF voltage limit by using a larger MAF housing with the OE MAS centered in the wider portion of the MAF housing barrel. Given they know the amount of flow that 'escapes detection' they scale the fuel delivery accordingly. As a result working around the voltage limit this way, the OE scale is in effect and PES cars will only read ~170g/s as the other ~50-60 g/s goes 'around' the MAS.

So, depending on exactly how Hans approaches the set up in your situation, the 'rule' may or may not hold for you.

Audi2ptzero · 08-29-2005, 01:05 PM

The maf readings only work if your running a stock maf sensor/housing combo. Once you change that the readings and scale rate will change.

Audi2ptzero · 08-29-2005, 01:09 PM

This gives me a standard 5-6g/s reading at idle and a reading of 230-250 g/s when producing 400+ whp. Only bad part is that the DBW maf doesn't work like the ndbw, there is no 0-5 volt signal for me to see what % it is running at.

08-23-2005, 04:05 AM	#2
Ray Khan AudiWorld Super User Garage is empty, add now Join Date: Apr 2000 Location: Melrose, MA Posts: 20,310	peak should be a number about 80% of your horsepower so if your car is a stock 1.8T then that sounds ok. __________________ Ray Khan 00 1.8T QM APR stage 3+ APR Exhaust APR Intake DUH FMIC Southbend OFE Stage 4 clutch SPEC 12 lb flywheel Greddy Profec B electronic boost controller Porshe Boxster calipers BIRA stage I brackets Hawk HPS brake pads A8 rotors, SS lines V&S Short Shifter Vogtland Coilovers Neuspeed 19mm rear sway 18x8 Flik Lex 235/40/18 Falken GRB 451 17x7.5 B5 S4 Avus 205/50/17 Dunlop Wintersport 3D Sony XM 7554 amp with 5.25" and 6.5" Infinity kappas MTX 801D amp with 2x10" kenwood sub enclosure Xenons Fog light relay mod VDO boost gauge in custom vent pod Clear corner mod S4 wheel well liner RS-4 grill AIM and MSN messenger:rakha77

08-23-2005, 01:28 PM	#3
AvantMnkyA4 Member Garage is empty, add now Join Date: Aug 2004 Posts: 2,759	seems kind of low. My TT 180 get 150 around that RPM __________________ 03' Black A4 Avant Quattro Tiptronic/Sport suspension/S4 Sway/18" OZ Superleggera B5S4 Brakes/Hawk HPS/Stoptech SS Lines Tint: 20% rear / 35% front

08-24-2005, 03:40 PM	#4
A400 AudiWorld Super User Garage is empty, add now Join Date: Sep 2003 Posts: 3,931	Please tell me where I can find that info Ray, always willing to learn. __________________ Whole lotta car

08-24-2005, 06:44 PM	#5
Ray Khan AudiWorld Super User Garage is empty, add now Join Date: Apr 2000 Location: Melrose, MA Posts: 20,310	from some Ross-Tech/VAG COM notes on MAF testing a friend had it for when we tested her MAF and the numbers worked out right for a stock turbo car. I know if you convert turbo flow to g/s it should work out pretty closely. __________________ Ray Khan 00 1.8T QM APR stage 3+ APR Exhaust APR Intake DUH FMIC Southbend OFE Stage 4 clutch SPEC 12 lb flywheel Greddy Profec B electronic boost controller Porshe Boxster calipers BIRA stage I brackets Hawk HPS brake pads A8 rotors, SS lines V&S Short Shifter Vogtland Coilovers Neuspeed 19mm rear sway 18x8 Flik Lex 235/40/18 Falken GRB 451 17x7.5 B5 S4 Avus 205/50/17 Dunlop Wintersport 3D Sony XM 7554 amp with 5.25" and 6.5" Infinity kappas MTX 801D amp with 2x10" kenwood sub enclosure Xenons Fog light relay mod VDO boost gauge in custom vent pod Clear corner mod S4 wheel well liner RS-4 grill AIM and MSN messenger:rakha77

08-24-2005, 08:49 PM	#6
Yippers® Member Garage is empty, add now Join Date: May 2001 Posts: 17,324	Here's a post from Uwe .. I've read this elsewhere as well. http://forums.audiworld.com/vag/msgs/2800.phtml __________________

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08-26-2005, 10:37 AM	#7
A400 AudiWorld Super User Garage is empty, add now Join Date: Sep 2003 Posts: 3,931	So mine should show 440? I will try this and see. I have dyno figs so that is what it should show. __________________ Whole lotta car

08-26-2005, 11:23 AM	#8
Yippers® Member Garage is empty, add now Join Date: May 2001 Posts: 17,324	For ~550 crank .. yes ~440g/s. This presumes there isn't a scaling work-around in the system. For example, on the nDBW Stage III APR uses the OE MAF housing and MAS. They add a divider circuit to the chip and keep the OE 'map scaling'. So I see maximum MAF readings of around 230g/s on the 93 program. 230/.80=287 On the otherhand, PES/GIAC chose to work around the (~5v) OE MAF voltage limit by using a larger MAF housing with the OE MAS centered in the wider portion of the MAF housing barrel. Given they know the amount of flow that 'escapes detection' they scale the fuel delivery accordingly. As a result working around the voltage limit this way, the OE scale is in effect and PES cars will only read ~170g/s as the other ~50-60 g/s goes 'around' the MAS. So, depending on exactly how Hans approaches the set up in your situation, the 'rule' may or may not hold for you. __________________

08-29-2005, 01:05 PM	#9
Audi2ptzero Elder Member Garage is empty, add now Join Date: Sep 2002 Posts: 14,369	I thought you would be running mafless? The maf readings only work if your running a stock maf sensor/housing combo. Once you change that the readings and scale rate will change.

08-29-2005, 01:09 PM	#10
Audi2ptzero Elder Member Garage is empty, add now Join Date: Sep 2002 Posts: 14,369	On my custom setup he also rescaled the maf readings to work with my 3.5" housing and stock sensor. This gives me a standard 5-6g/s reading at idle and a reading of 230-250 g/s when producing 400+ whp. Only bad part is that the DBW maf doesn't work like the ndbw, there is no 0-5 volt signal for me to see what % it is running at.

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08-29-2005, 01:09 PM
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