You can change the style the forum displays by selecting your preferred style at the bottom left of the site.
We have made an enhancement so that old threads should now link from search results to the correct thread. This is not yet in place for single post links
well i managed to answer my own question.....i bought a RS2 maf myself and i can say there is no difference between a S2 one and i didnt even have to modify my aby airbox to fit! the diameter is the same so how does the RS2 maf flow more?
Alan at vagparts done me a great offer, £141 delivered to my door!
1995 B4 Audi 80 S2 avant 267bhp and 326lbft *sold*
well i managed to answer my own question.....i bought a RS2 maf myself and i can say there is no difference between a S2 one and i didnt even have to modify my aby airbox to fit! the diameter is the same so how does the RS2 maf flow more?
Alan at vagparts done me a great offer, £141 delivered to my door!
Look at the shields on the RS2 compared to the stock. The RS2 shield is less of a restriction and therefore allows quicker air flow.
So is the flow the only difference between stock and RS2 MAF? I have now used the RS2 MAF for a week and seems to be some difference in behavior and AFR(lambda values).
The car feels more responsive and efficient. On idle the lambda value is now 1.12-1.20. With the stock MAF it was 1.00-1.01.
On light revs the mix stays quite lean and only on high boost it riches out. On full throttle and boost the lambda is 0.88-0.89. Before it was 0.86 and the mix was whole time on the rich side on light throttle and boost.
Does these kind MAF's wane bit by bit or does they only die inctancly?
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
So is the flow the only difference between stock and RS2 MAF? I have now used the RS2 MAF for a week and seems to be some difference in behavior and AFR(lambda values).
The car feels more responsive and efficient. On idle the lambda value is now 1.12-1.20. With the stock MAF it was 1.00-1.01.
On light revs the mix stays quite lean and only on high boost it riches out. On full throttle and boost the lambda is 0.88-0.89. Before it was 0.86 and the mix was whole time on the rich side on light throttle and boost.
Does these kind MAF's wane bit by bit or does they only die inctancly?
change the MAF and re install your original one
i did something similar around 3 months ago testing 2 diferent 3B Mafs and with the not original one my AFR values were leaner,just as you says
i have heard that all or some ECU setups needs to be desinged for the diiferents Mafs ...
RED Mitsubishi Lancer Evolution VI TME nº 16 of 250 BLACK Mitsubishi Lancer Evolution VI TME nº 189 of 250
LWB Audi Sport Quattro project
Internally the RS2 MAF and AAN/S2 MAFs are the same. Looking from the inlet end, you can see the difference in restriction to air flow (AAN/S2 on the left, RS2 on the right). On that basis, I have no doubt that the better response that you *think* you are experiencing is real.
More MAF info HERE (note link to Paul N's MAF info in there)
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
well i managed to answer my own question.....i bought a RS2 maf myself and i can say there is no difference between a S2 one and i didnt even have to modify my aby airbox to fit! the diameter is the same so how does the RS2 maf flow more?
Alan at vagparts done me a great offer, £141 delivered to my door!
Below is how the RS2 MAF fits to the airbox, both S2 & RS2. You must rotate the MAF as seen in the photo and then mount your bolts. It's still a very tight fit.
Internally the RS2 MAF and AAN/S2 MAFs are the same. Looking from the inlet end, you can see the difference in restriction to air flow (AAN/S2 on the left, RS2 on the right). On that basis, I have no doubt that the better response that you *think* you are experiencing is real.
Yes, I'm known about the visible differences, but the difference in the mixture before and after is quite big especially on idle, so I wonder if there are also some other differenceses between theese MAF's..? The reason the efficient is better is propably because the mixture is leaner.
Originally posted by Thuppu
Does these kind MAF's wane bit by bit or does they only die inctancly?
Do you have any opinion about this question? I was thinking if my old AAN MAF was worned a bit when we made the remap... I soon get another AAN MAF for testing, then we see how it works.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
So is the flow the only difference between stock and RS2 MAF? I have now used the RS2 MAF for a week and seems to be some difference in behavior and AFR(lambda values).
The car feels more responsive and efficient. On idle the lambda value is now 1.12-1.20. With the stock MAF it was 1.00-1.01.
That means one of the MAF's is off calibration/broken.
I have personally swapped two working MAF's on my car and logged AFR, it's exactly the same.
On light revs the mix stays quite lean and only on high boost it riches out. On full throttle and boost the lambda is 0.88-0.89. Before it was 0.86 and the mix was whole time on the rich side on light throttle and boost.
Does these kind MAF's wane bit by bit or does they only die inctancly?
They do slowly get less sensitive.
Is the RS2 MAF new? Or is it used?
Either way, when fitting two different new/lightly used MAF's I had no change in AFR. And I wasn't looking only on the display of the controller. I actually logged the exact same pull on the exact same piece of road from exact the same RPM's.
No difference.
It's used. If you Dmitri remap a car, can you tell without comparsion if the MAF has seen better days?
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
We process personal data about users of our site, through the use of cookies and other technologies, to deliver our services, personalize advertising, and to analyze site activity. We may share certain information about our users with our advertising and analytics partners. For additional details, refer to our Privacy Policy.
By clicking "I AGREE" below, you agree to our Privacy Policy and our personal data processing and cookie practices as described therein. You also acknowledge that this forum may be hosted outside your country and you consent to the collection, storage, and processing of your data in the country where this forum is hosted.
@ the Carbon MAF.
Comment