Audi S4 Maf, Badger,Tuffty,Welly

[Andrew@A.L.D]

I see that wellys and Tufftys Mafs are maxing out with there set up

I see your looking at a S4 maf but which one will you be trying out?

N/A 4.2L or 2.7 BI Turbo one

 

[MUSH]

Cant you use the s3 maf but in the 4 inch tube and scale the sensor parameters to suit in the map?

 

[Andrew@A.L.D]

Not sure the s4 has a different sensor? Young the size of the tube is a option just looking into it before mapping

 

[Andrew@A.L.D]

done a bit of research and here is what i found on the net

S3 has a 2.80 bore

2.7 bi turbo is said to be 3.00 bore

4.2 N/A has a 3.5 outer bore not sure what ID it has but looks like it will be over 3.00

 

[Sam_]

I'm going to see the guy building that big turbo S3 in my thread at the weekend so I'll ask which he used on his GT2871R build. I think he may be going MAFless on the new build.

 

[beachbuggy]

RS4 mafs are good for 550g/s or 600bhp. So unless you pan on going over that you can use the RS4 Maf ok,

 

[badger5]

0280218038 maf i used to un on my ibiza (max'd it) measures 77mm ID 86mm OD
I cant for the life of me remember what model it came off.. anyone match the numbers to the donor? - S4 maybe?

 

[s3dave]

0280218038 maf i used to un on my ibiza (max'd it) measures 77mm ID 86mm OD
I cant for the life of me remember what model it came off.. anyone match the numbers to the donor? - S4 maybe?

Application List​

​

Vehicle​

Year​

CC​

Engine Code​

AUDI - A6 2.7 T Feb 1999 to Jan 2005 2671 AJK AUDI - A6 2.7 T Feb 1999 to Jan 2005 2671 AJK AUDI - A6 Avant 2.7 T Feb 1999 to Jan 2005 2671 AJK AUDI - A6 Avant 2.7 T Feb 1999 to Jan 2005 2671 AJK AUDI - A6 Avant 2.7 T quattro Jun 1999 to Aug 2001 2671 AJK AUDI - A6 Avant 2.7 T quattro Jun 1999 to Aug 2001 2671 AJK AUDI - A6 Avant 2.7 T quattro Jun 1999 to Aug 2001 2671 AZA AUDI - A6 Avant 2.7 T quattro Jun 1999 to Aug 2001 2671 AZA AUDI - A6 2.7 T quattro Jun 1999 to Aug 2001 2671 AJK AUDI - A6 2.7 T quattro Jun 1999 to Aug 2001 2671 AJK AUDI - A4 S4 quattro Sep 1997 to Nov 2000 2671 AGB AUDI - A4 S4 quattro Sep 1997 to Nov 2000 2671 AGB AUDI - A4 S4 quattro Sep 1997 to Nov 2000 2671 AZB AUDI - A4 S4 quattro Sep 1997 to Nov 2000 2671 AZB AUDI - A4 Avant S4 quattro Apr 1998 to Jul 2001 2671 AGB AUDI - A4 Avant S4 quattro Apr 1998 to Jul 2001 2671 AGB AUDI - A4 Avant S4 quattro Apr 1998 to Jul 2001 2671 AZB AUDI - A4 Avant S4 quattro Apr 1998 to Jul 2001 2671 AZB

 

[Welly]

Probably an RS4 MAF here - part number 077 133 471 K

Well, dependant on what the deal is with the scaling on mine...

 

[Andrew@A.L.D]

RS4 mafs are good for 550g/s or 600bhp. So unless you pan on going over that you can use the RS4 Maf ok,

2.7 or 4.2 RS4 MAF?

 

[badger5]

My S6 MAF's enormous..

BUT - remember the idle g/s from a small displacement engine on a supersize maf will be pretty low signal, and I wonder how stable it will be

 

[Andrew@A.L.D]

I think a RS4 2.7 one will be man enough for my 2.1 GTX3076r

 

[Andrew@A.L.D]

0280218038 maf i used to un on my ibiza (max'd it) measures 77mm ID 86mm OD
I cant for the life of me remember what model it came off.. anyone match the numbers to the donor? - S4 maybe?

Just got one of these now, just need the silicone hose but i can't find any hose that has a 86mm ID for the maf? is that OD correct bill, may wait till i get it

 

[badger5]

86mm OD - rechecked yes

I would confirm the sensor with your chosen mapper first... so he can map with it

 

[Andrew@A.L.D]

One last thing

Is it the sensor thats the restriction or the housing ?

 

[badger5]

http://badger-5.com/bin/published-bosch-sensor-data.pdf

read page 54/55 on maf's and how they work

sensor is a temperature device.. metal film resistor. it measures velocity, which is calculated into mass airflow by knowing the internal diameter of the tube it sits in.

same mass air flow thru larger tube, the velocity slows down.. so maf sensor would ouput a lower voltage.. aka ecu would think a lesser amount of mass airflow went in.. Hence ask your mapper before adding something they may not wish to accomodate

 

[BuuBBa]

So if I max out the S4 maf (337 g/s?) the tune would be based on map signal?
Would I benefit anything if I use RS4 maf over maxed out S4 maf?

 

[<tuffty/>]

So if I max out the S4 maf (337 g/s?) the tune would be based on map signal?
Would I benefit anything if I use RS4 maf over maxed out S4 maf?

MAP runs out at 1.5bar so don't rely on that.. benefit of using an RS4 MAF is that the ECU and VCDS will see true airflow... however its not as simple as just fitting and RS4 MAF...

Map will need rescaling and compensation maps fine tuned on a steady state dyno to tweak fuelling on part throttle loads for a start...

<tuffty/>

 

[Andrew@A.L.D]

Welly is still on a s3 maf and he's making 445 bhp

I did run a s4 maff but now run a rs4 maf due to my gtx 4 in intake and power level of my engine spec

 

[BENJAMIN]

I'm running a S4 2.7t maf housing with S3 sensor. It's reading around 280g/s and made 405.8bhp on Saturday. The idle is good!

 

[BuuBBa]

Ofcourse the car will be tuned for the custom setup..

Oh I did not know about the 2.5bar MAP...
Is there any 3bar MAP that would fit straight to original position? Or would it be easier to plug the hole and take pressure from manifold to external map?

 

[<tuffty/>]

Ofcourse the car will be tuned for the custom setup..

Oh I did not know about the 2.5bar MAP...
Is there any 3bar MAP that would fit straight to original position? Or would it be easier to plug the hole and take pressure from manifold to external map?

What the MAP sensor sees is irrelevant in context as it won't affect the engines ability to make power or run boost higher than 1.5bar... the 2550mb limit is hard coded to the maps binary and cannot be changed without decompiling the machine code...

Using an external MAP sensor serves no purpose...

<tuffty/>

 

[<tuffty/>]

I'm running a S4 2.7t maf housing with S3 sensor. It's reading around 280g/s and made 405.8bhp on Saturday. The idle is good!

Not scaled then lol... S4 MAF tube should be good for 337gs (420 odd hp)... earlier S4's had Bosch MAF's and later ones used Hitachi... the data in the maps are different scaling wise and there is also an offset value to watch out for..

AMK/BAM S3 maf tube runs out (in VCDS) at 292.58... APY max earlier...

<tuffty/>

 

[BuuBBa]

Okay, I thought its the sensor that has 2.5bar limit.

So professional tuner can make the ECU understand MAP boost pressure over 1.5bar?
Or how the ECU can be tuned if the MAF and MAP is maxed out?

 

[BENJAMIN]

Not scaled then lol... S4 MAF tube should be good for 337gs (420 odd hp)... earlier S4's had Bosch MAF's and later ones used Hitachi... the data in the maps are different scaling wise and there is also an offset value to watch out for..

AMK/BAM S3 maf tube runs out (in VCDS) at 292.58... APY max earlier...

<tuffty/>

Nope not scaled, was running an S3 maf and 550's. Now running an S4 maf and 630's, Afr looks good and drives really well. Could do with a custom mapping session but as far as an off the shelf file goes its really good.

 

[<tuffty/>]

Okay, I thought its the sensor that has 2.5bar limit.

So professional tuner can make the ECU understand MAP boost pressure over 1.5bar?
Or how the ECU can be tuned if the MAF and MAP is maxed out?

The ECU interpolates data based on what it can see... I don't confess to fully understanding everything about it but it shouldn't be an issue if your tuner knows what they are doing with ME7 ECU's...

Nope not scaled, was running an S3 maf and 550's. Now running an S4 maf and 630's, Afr looks good and drives really well. Could do with a custom mapping session but as far as an off the shelf file goes its really good.

All that matters

I really need to get mine finished lol...

<tuffty/>

 

[BuuBBa]

Thanks tuffty, once again!
I havent decided who tunes the car cause dont even have all the parts yet.. But at least one tuner (in Finland) has managed to get 600hp with stock ECU from 1.8t, so he might be the one..