I had a chance to buy one of these a while back for a really good price but the guy backed out for the moment. Hopefully he'll read this and remember me and that I still want it It is strange how the S-AFC gets more attention than the HKS unit. I think its all in the display. The S-AFC looks better. And that's what REALLY counts right? hehe
Well what I'm using to guage my mixture are two Cyberdyne A/F guages. One for each 02 sensor. With the AFR set to 0 which is pretty much letting the 550 injectors run on their own via the ECU, it reads very rich, in fact the guages are pegged to rich.
So my only needs from the AFR is to lean out the mixture a bit.
With the AFR I have been able to lean out the mixture to a point that reads one LED past the Stoich LED.
Now I'm not saying this is an accurate way of tuning, heck it wasn't even on a dyno. But I was able to lean the mixture that far with relatively small adjustments on the HKS AFR. You can set each rpm point 50% +/-. And I only had to set it to -30% to -35% in the rpm point to get it to a mixture that felt right.
I can conclude that setting even further would have leaned my mixture to dangerous levels which I obviously do not need, but the point is that level of fuel adjustment can be achieved with the HKS AFR and 550cc injectors.
I'm in no way saying this is better than a VPC or ARC-II, but I dispute that that this isn't a decent entry level fuel controller for a setup consisting of 550cc injectors.
Again this is for the HKS AFR, I don't know about the Apex'i AFC.
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