S2/RS2 Maf

[Pete Reeve]

What is the difference between S2 & RS2 Maf if any please?

[valjo]

There are quite some topics regarding that case. I am sure that search option will find out all you need

[UrS4boy]

What is the difference between S2 & RS2 Maf if any please?

The staff here at STFA (Search the Forum Archives) is pleased to provide quattro corner, independent Audi parts supplier of the year, with an answer:

Electrically they are very similar if not the same. Physically they look different because of the grills involved (RR UrQ, S2, UrS4/S6 and 200 20VT on the left, RS2 on the right).

More detailed info: http://forums.quattroworld.com/s4s6/msgs/20442.phtml

[Pete Reeve]

Thank you I bow to your superior knowledge

[Pete Reeve]

So i take it they are interchangeable without any real noticeable effects

[macspring]

The staff here at STFA (Search the Forum Archives) is pleased to provide quattro corner, independent Audi parts supplier of the year, with an answer

Class.

[EspenW]

So i take it they are interchangeable without any real noticeable effects

They are indeed. My own RS Blau chariot being an example. Running a S2 Maf instead of the RS2, after ripping the hotwire out of the latter, due to too much airflow

[UrS4boy]

So i take it they are interchangeable without any real noticeable effects

When I "RS2'd" my 93 UrS4 in 2004, the "recipe" included the RS2 MAF because, well, that is what the RS2 ran so that's what you need. As time evolved and more info came in, it was determined (as shown in my MAF info post) that the electronics of the normal S2/AAN MAF and the RS2 MAF are the same (ish) and I could maybe have saved the $500 I paid for the new in a box RS2 MAF.

All that said, there are various discussions about the restrictions in the air flow for the S2/AAN MAF vs the unrestricted RS2 MAF. The issue is related to the need to have a screen to straighten out the airflow ahead of the MAF hot-wire and not having that screen restrict the airflow at higher engine speeds. Presumably the Porsche engineers who were looking at the ABY in the 93 S2 avant RS2 test mules thought through this a bit and decided on using the Bosch MAF that they were using in the 968 as the solution.

Today, there is an aluminum honey comb material that is said to be very good at straightening the flow while NOT restricting the flow. This could perhaps be installed in an S2/AAN MAF to duplicate the flow, etc. of the RS2 MAF.

http://www.saxonpc.com/100mm-cells-for-100.html

[simon20vq]

Is that maf cover also good for honey?

[Error404]

Nice idea. That ally honeycomb is pretty cheap and used in all kinds of composite panels. I think larger cells would be better, but in reality I suspect the performance loss / gain is probably pretty intangible as these MAFs are well out of range before they become restrictive to flow

[Pete Reeve]

What is the difference between S2 & RS2 Maf if any please?

The reason for the question is they are now both obsolete,i can get the RS2 Maf but it really is expensive, but at least you can use the S2 item

[ManiacuV6]

Try to search the forum. I think I read about using a Volvo MAF instead of Audi one.

[aRtiS]

Rs2 MAF is avaiable. S1 MAF too

[Rocco]

Is that maf cover also good for honey?

Yes yes

[Thuppu]

The reason for the question is they are now both obsolete,i can get the RS2 Maf but it really is expensive, but at least you can use the S2 item

Maybe you could get Dmitri(prj) to do a MAF conversion? http://www.s2forum.com/forum/showthread.php?t=49825