Moxeys93RX7

are the S4 T2 and S4 n/a afm's the same? im having problems and i think they are casued by the afm. only other one i can get my hands on is an n/a? will it work for troubleshooting?

Rotorific

iTrader: (1)

yes and no...no they are not the same but yes you can use the other afm for troubleshooting....also you might just need to check out your afm's solder points and make sure the afm when installed is seated properly....

NZConvertible

They're externally identical but have quite different calibration. If you have to use the wrong one, don't do any hard driving, because you're mixtures will be messed up.

TonyTurboII

Ive read the TII AFM can read a bit more air, so take that into consideration when you press the gas.

Roy James

Oh ****, im in big trouble. LoL, i have a TII AFM on my 86 base and it was running 14.6s all day long at the track. So, i guess, im seriously fucked. Also, when under "hard driving" doesnt the ECU go into set fuel maps and pays no attention to the AFM or the O2? That is the impression i was under

NZConvertible

I never implied the mixtures would be "seriously fucked", but they will be different if you swap AFM's, because they're calibrated differently and will send the ECU different signals at the same airflow. In open-loop the O2 sensor is ignored, but the AFM is always the ECU's primary load sensor. Without it it doesn't have a clue what's going on. I said no hard driving because if an AFM swap caused leaner mixtures the chances of detonation is much greater under high load.

A 14.6sec NA is obviously pretty highly modded, so obviously the T2 AFM worked well for your car. I just don't like making random changes that I know will affect mixtures, but I don't know by how much.