edit... did a look around for more info on the net. Seems like varied opinion on the VAFC for modern ECUs. Is what this chap saying about the s2000 manifold Air Pressure Sensor the same for the CL9 (vs mass airflow sensor)? I don't know the difference between these sensors. If Nick's dyno figure stays the same after a few weeks then there is the answer..Originally Posted by aaronng
http://www.s2ki.com/forums/index.php?showtopic=390966
"Depending on who you talk to, VAFC's are useless. We have a manifold Air Pressure Sensor (not a Mass Airflow Sensor). So when the VAFC adjusts the air/fuel ratio, the ECU notices that the intake manifold pressure is higher, and corrects. The only way I think the VAFC will work is with an engine management unit (like AEM) that can be programmed to not correct for the pressure difference.
This is from what I have gathered. In order to gain any real gains, the ECU will need to be reset every so often, so the ECU will have to "learn" all over again about the MAP sensor readings.
Let me know what you find out....I have been looking into this as well (because the earlier AP1's run REALLY rich up top).
John "
and
"There was a thread on here, I will see if I can find it, that had a dyno sheet RIGHT after install (amazing gains). Then there was one 2 weeks later, after the ECU adapted.......and there was barely any gain anywhere (a little at the top, but not much)."
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