Question about the BAMM

X-Pwred225 · 02-14-2005, 07:51 PM

I was wondering is the BAMM a way to trick the MAF sensor to allow more air to flow through? Thanks for the help.

TTschwing · 02-14-2005, 08:00 PM

The objective is to allow the car to breath better by increasing the MAF housing size. Increasing the inner diameter by only .15 of an inch increases the surface area by more than 11%. Basic physics will tell you, that when you increase the diameter, the velocity of the air running through it is reduced (even though you're getting more air volume.)

Since the ECU takes it's signals for fueling partially from the MAF sensor, you end up with a lower signal being interpreted by the ECU. ECU sees a lower signal, assumes less air, and reduces fuel. The reduction in signal from the MAF is directly proportional to the increased surface area of the new diameter maf housing. This is where the problem arises. The ECU will also adapt to condidtions by taking downstream readings from the O2 sensors, but only in a very small range. Increasing the airflow by 11% and reducing the Fuel 11% can only be compensated for for so long, then a lean code is thrown (Multiplicative adaptation exceeds +20%.) This is where the 4 bar comes in...It squirts more fuel, the O2 sensors adapt to this new condition, and the Adaptation maps come into line somewhere around -4% (rich) which is about where you want them (0% being optimum). The greater fuel charge.
brings the adaption maps ito a range the ECU can compensate for. A/F ratios still go rich under heavy acceleration as that's controlled by different maps in the ECU (as they should). The need to balance the new MAF ID to the correct adaptation range is trial and error. 1/10th of an inch is the difference between it working or not working...

JohnLZ7W · 02-14-2005, 08:02 PM

the BAMM is the housing that the MAF sits in and has a larger inside diameter than the stock housing so it does let more air thru. So yes the MAF is fooled because it is calibrated for the stock housing (hence the need for the 4bar FPR to compensate) but the MAF isn't the restriction, it's the MAF housing.

X-Pwred225 · 02-14-2005, 08:13 PM

TTschwing · 02-14-2005, 08:16 PM

It just replaces the stock part. You'll need a TTDA or other 3"ID clamp on filter system to use it though (it WILL work with your P-flow). Won't work with a stock airbox..

X-Pwred225 · 02-14-2005, 08:26 PM

Does the BAMM come with a sensor or would I take the sensor out of the stock housing and place it in the BAMM?

TonyStarkz · 02-14-2005, 08:30 PM

TTschwing · 02-14-2005, 08:30 PM

$75 in stainless. $55 for a 4 bar FPR, $5 to ship. I'll be back in the BAMM business this week as I have a load of the sensor holders in UPS as we speak. The new style looks like:

X-Pwred225 · 02-14-2005, 08:36 PM

Do you have any pics or instructions of how to remove the sensor then install it in the BAMM? Thanks for all the help.

meem · 02-14-2005, 08:58 PM

02-14-2005, 07:51 PM	#1
X-Pwred225 Junior Member Account #: 52366 Join Date: Mar 2003 Posts: 901	Question about the BAMM I was wondering is the BAMM a way to trick the MAF sensor to allow more air to flow through? Thanks for the help. __________________ Denim '01 225 Quattro = Fun times.

02-14-2005, 08:00 PM	#2
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	BAMM Theory...> The objective is to allow the car to breath better by increasing the MAF housing size. Increasing the inner diameter by only .15 of an inch increases the surface area by more than 11%. Basic physics will tell you, that when you increase the diameter, the velocity of the air running through it is reduced (even though you're getting more air volume.) Since the ECU takes it's signals for fueling partially from the MAF sensor, you end up with a lower signal being interpreted by the ECU. ECU sees a lower signal, assumes less air, and reduces fuel. The reduction in signal from the MAF is directly proportional to the increased surface area of the new diameter maf housing. This is where the problem arises. The ECU will also adapt to condidtions by taking downstream readings from the O2 sensors, but only in a very small range. Increasing the airflow by 11% and reducing the Fuel 11% can only be compensated for for so long, then a lean code is thrown (Multiplicative adaptation exceeds +20%.) This is where the 4 bar comes in...It squirts more fuel, the O2 sensors adapt to this new condition, and the Adaptation maps come into line somewhere around -4% (rich) which is about where you want them (0% being optimum). The greater fuel charge. brings the adaption maps ito a range the ECU can compensate for. A/F ratios still go rich under heavy acceleration as that's controlled by different maps in the ECU (as they should). The need to balance the new MAF ID to the correct adaptation range is trial and error. 1/10th of an inch is the difference between it working or not working... __________________ no sig, Not here

02-14-2005, 08:02 PM	#3
JohnLZ7W AudiWorld Super User Account #: 5201 Join Date: May 2000 Posts: 21,133	The MAF just measures the air going past it... the BAMM is the housing that the MAF sits in and has a larger inside diameter than the stock housing so it does let more air thru. So yes the MAF is fooled because it is calibrated for the stock housing (hence the need for the 4bar FPR to compensate) but the MAF isn't the restriction, it's the MAF housing. __________________ John 225QC Aviator Grey/Ebony Cloth Road Trip 2007 blog and gallery. "I just want to drive. I don't want to stop doing this, at all, ever" - Richard Hammond "This is me breathing" - Martin Blank

02-14-2005, 08:13 PM	#4
X-Pwred225 Junior Member Account #: 52366 Join Date: Mar 2003 Posts: 901	How is the BAMM installed? __________________ Denim '01 225 Quattro = Fun times.

02-14-2005, 08:16 PM	#5
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	Same place the stock MAF housing goes....> It just replaces the stock part. You'll need a TTDA or other 3"ID clamp on filter system to use it though (it WILL work with your P-flow). Won't work with a stock airbox.. __________________ no sig, Not here

02-14-2005, 08:26 PM	#6
X-Pwred225 Junior Member Account #: 52366 Join Date: Mar 2003 Posts: 901	Sorry for the questions but... Does the BAMM come with a sensor or would I take the sensor out of the stock housing and place it in the BAMM? __________________ Denim '01 225 Quattro = Fun times.

02-14-2005, 08:30 PM	#7
TonyStarkz Junior Member Account #: 27805 Join Date: Nov 2001 Posts: 2,029	you take it out the stock housing.

02-14-2005, 08:30 PM	#8
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	You use your existing sensor....>> $75 in stainless. $55 for a 4 bar FPR, $5 to ship. I'll be back in the BAMM business this week as I have a load of the sensor holders in UPS as we speak. The new style looks like: __________________ no sig, Not here

02-14-2005, 08:36 PM	#9
X-Pwred225 Junior Member Account #: 52366 Join Date: Mar 2003 Posts: 901	Last question... Do you have any pics or instructions of how to remove the sensor then install it in the BAMM? Thanks for all the help. __________________ Denim '01 225 Quattro = Fun times.

02-14-2005, 08:58 PM	#10
meem Elder Member Account #: 1898 Join Date: Mar 2000 Posts: 17,150	hijack: which shift knob is that in your sig, john? __________________ -- meem \|\| amulet red 2001 tt quattro coupe :: imola red 2003.5 m3 coupe

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