VTECnology thanks for the info. I have some home work to do and find a dyno somewhere in north west Ohio. I checked out autocarparts.com. They carry both AEM and Injen CAIs. I've been looking for an Injen CAI.

 

Thanks for that info! That makes me feel better about the ECU not adjusting for the V-AFC.

I am looking into getting one now.

 

You might be interested in this too, if your interested in getting a vafc.

http://www.s2000online.com/forums/showthre...ht=vafc+harness

 

Damn people, read the factory service manual before making blanket statements like this. If you alter the mixture at part throttle, the ECU will adjust for it. The reason the VAFC works is that you can adjust it to change the mixture only at WOT where the ECU ignores O2 sensor input. The reason airflow mods work is because the ECU is adding more fuel to compensate for more air, hence more power. Try to lean the mixture at part throttle and the ECU will adjust fuel trim levels.

This isn't speculation folks, its fact.

UL

 

Ok, now I understand an earlier thread. our ECU does adjust as do almost all ECUs I know of. that is pretty much the point of O2 and other sensors. If ECUs didn't adjust settings there would be no point to a sensor. Our ECUs adjust to alot of things. Temp. Octane level, Airflow and density, etc. etc. It follows certain perameters in it's adjustment though. The V-AFC can change the perameters in which the ECU works. Telling it to operate with a more lean air fuel ratio. Obviously your ECU is going to run the car leaner in warmer weather than in cold and its going to squirt more fuel with airflow mods to compensate for more air. With a V-AFC it still does this. You can just adjust air/fuel ratios to run so much fatter or leaner than your factory settings would normaly run. Lets just say for instance that your air/fuel ratio could be measured on a scale of 1 to 10 and your ECU normally adjusted between 6 and 9, a V-AFC can "tell" the ECU to operate between 5 and 8 instead. I know that this is way over-simplifying but I'm really racking my brain trying to figure out how to explain it. I stay with my original post in that our ECU is not "intelligent". It does not "learn" the V-AFC settings over time and compensate back to stock settings. It does however affect partial throttle settings. It has the ability to adjust both partial and wide open throttle independently of each other. this can be felt in daily driving by the increase in torque and seen in the fact that with no other changes I went from about 27 mpg highway to 31. I know this is lengthy but I'm tryin to explain it the best I can. Also, just to see if I can start another arguement, our ECUs are burned. They are not programmable.