Quote:
Originally Posted by BeemerBob
I'm not willing to go all in on a Power Commander and the associated dyno runs and custom tuning, so I wanted to see if there was any current feedback on the use of a temp spoofer and if it helps with fueling and throttle response. I also don't want a significant drop in milage.
I know there is a lot of info on the list, but much of it is dated. The players seem to be Booster Plug (reasonable at $150), and then AF-XIED and FRK at $379 and $293 respectively. Seems like a crazy amount for some resistors in molded plastic for the latter two? I have no idea if the AF-XIED is any different from a regular spoofer?
Any current input from anyone that has added one of these and the effect that it had?
I just have an Akro slip-on and the cat is still there. No header replacement.
Thanks!
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Although the air temp spoofers are just NTC resistors potted in plastic, the AF-XIED is a microprocessor based unit that measures the O2 sensor output voltage, does some computations on the signal and then outputs a new voltage/signal profile with different levels and phase-shifted relative to the input signal.
The air temp spoofers all work on the theory that by making the intake air look cooler the ECU will add fuel. While true at first, both the Motronic and BMSK ECUs have powerful software that negates the "error" that they detect from the "wrong temperature" being supplied. It is easy to measure and show that this happens:
2004 R1150RT Wideband O2 Sensor Project (and AF-XIED for BMW) | Page 40 | Adventure Rider.
The AF-XIED works by knowing that the ECUs use the O2 sensor as the fueling standard for all final corrections and compensations. Since whatever the O2 sensor indicates IS the ECU's reference, the ECU will never try to correct it. In fact the ECU adjusts fueling and creates fueling trims that add an amount of fuel, to all fueling situations, equal to the shift dialed in on the XIED.
So for example, if you set the AF-XIED to shift fueling by 6%, the ECU will after a short time, add 6% fuel to all Open and Closed Loop fueling.
One way to keep the air temp shift from being negated is to disconnect your O2 sensor(s). That however disables the ECU's most powerful feature, long term adaptation.