Rs2 kit, what afr/lambda?

[MrVain]

I have a friend with a rs2 kited S4 avant. It has a RS2 ecu and maf, 444cc inj snd all.
We se 13.0 afr at full boost. Anyone using wideband lambda and have some numbers to compare to?

[aronmatic2]

I have a friend with a rs2 kited S4 avant. It has a RS2 ecu and maf, 444cc inj snd all.
We se 13.0 afr at full boost. Anyone using wideband lambda and have some numbers to compare to?

12,5 afr can be better. hit the fuel pressure regulator

[Ross]

I don't know what they are stock, but isn't AFR of 12 about as lean as you want to go on boost? My map gives about 11.4:1 on boost.

[Jamo]

Your old 3071 was about 12.5 iirc but that was because your injectors were diddy!

13 afr on boost isn't good imo

[MrVain]

As i thought then... its running to lean

[prj]

RS2 ECU is not made for 444cc injectors. It will run like crap unless the ECU is remapped. You will just run 10AFR all the time.

If your ECU was remapped, ask the tuner that remapped it what he mapped it to.
You can map a car to 13.0 under boost, no real reason to, as these usually make best power around 11.4-12.

If it is just a normal RS2 ecu with chips, and you have 444cc injectors, and you are running 3.8-4 bar fuel pressure, I would be quite worried. It would likely mean that your fuel pressure is dropping very hard. What fuel pump do you have on that car?

[MrVain]

Its rs2 injectors. thought they were 444cc.
Dont know what fuelpump he is running... i have sugested he bye a 044

[Jamo]

Try doing the direct wiring feed to the fuel pump and changing the fuel filter 1st

[prj]

Btw, RS2's are mapped to 13.0 stock and with some chipsets I know.
So it's possible it is normal.

Check your fuel pressure and also try a different MAF.
When MAF's let go they start running too lean up top.

[Jamo]

Really? Most uk audis dyno richer that that so that is a surprise