rs2 maf vs s2 maf

[valjo]

HI!
i will have to change mine maf so i am planing to buy new one from bosch. I saw thet rs2 and s2 have different version of maf, but the price is the same.
So mine questation is what is the differences, what is advantages using rs2 maf instead s2 maf?
Is there any disadvantiges using rs2 maf on s2 aby?
thanks and have a nice day!

[UrS4boy]

As far as I know (from information from Mihnea at MRC), the internals of the S2 (and UrS4) Mass Air Flow (MAF) sensor and the RS2 MAF are the same. The main difference is the RS2 MAF will flow more air than the S2 MAF for the same pressure drop. The issue is the metal screening on the S2 (UrS4) MAF versus the wide open plastic grid on the RS2 MAF. The metal screen causes more pressure drop than the RS2 plastic grid. An S2 (UrS4) MAF can be made to flow more air by removing the screens. However, there are those that contend the screens are there not only to protect the MAF hot wire but to also straighen and smooth the air flow into the hot wire. (Presumably the RS2 MAF plastic grid does some smoothing as well). Removing the front metal screen on and S2 (UrS4) MAF would negate this function (I cannot see an issue with the rear screen). There is an article out there in cyberspace regarding "Negative Boost" that goes through this.

I would say it depends on your budget and where you are going with your upgrades. If you aren't going for more than 280 hp (i.e.just a chip), then I would stay with the S2 MAF but find a good used one. If you were going to go RS2 or someother EM, turbo, injector, etc. upgrade to take you into the 315 hp plus range, I would spring for the RS2 MAF.

Dave F.

[Jamo]

RS2 maf for the price

[valjo]

thanks for those great post dave!! so using rs2 maf on stock but chiped s2 is ok ?

@jamo according to mine akte prices for both is 210eu..... i am sitll waiting for prices from local bosch dealer

[Jamo]

https://sslrelay.com/s74326199.oneandoneshop.co.uk/sess/utn;jsessionid=1546a48e023b00a/shopdata/0010_Audi/0080_S2+=2B+RS2/0080_RS2+parts/product_details.shopscript?article=0035_RS2%2BMAF%2B%3D28034133471N%3D29

[mcandmar]

Is that true it wont fit an ABY airbox?

Mark.

[porkkis]

Umh. Yes and no. Not because of size but attachment bolts are a bit closer to each other in RS2 so when swapping rs2 air box to s2, the s2 maf has to be filed a bit. Dunno about the other way round.

[mcandmar]

Thats what i really wanted to know, thanks!

Mark.

[HPmuirt]

Umh. Yes and no. Not because of size but attachment bolts are a bit closer to each other in RS2 so when swapping rs2 air box to s2, the s2 maf has to be filed a bit. Dunno about the other way round.

Sorry, that is wrong.

I have run an RS2 airbox for over 18 months, but only fitted my RS2 MAF about 4 months ago. Before that, I ran an RS2 airbox with my S2 MAF and it bolted up with no issues what so ever.

Cheers n

Si

[porkkis]

Umh. Strange. My statement is based on experience.

[A80Avant]

i had an AAN MAF on my RS2 airbox once...!

[Jamo]

Sorry, that is wrong.

I have run an RS2 airbox for over 18 months, but only fitted my RS2 MAF about 4 months ago. Before that, I ran an RS2 airbox with my S2 MAF and it bolted up with no issues what so ever.

Cheers n

Si

Ditto had an RS2 box for 2 years always been ran with an S2 MAF.

I've got the RS2 MAF now to try after it goes in a MAF bath.

[A80Avant]

also i had noticed that the S2 maf towards the RS2 maf with a KN filter,always felt a bit laggyer up to 3000rpm(the S2maf).And i used the s2 maf without the screens.As now i do with the RS2 maf

[Briggsy]

whats the verdict on using a RS2 maf in a aby airbox, is it a staright swap??

jose.

[Briggsy]

someone must know?