I haven't experienced anything like that. If lowering VTEC would cause the knock sensor to give a false alert, it would have negative effects well into the RPM range. I lowered VTEC to 5500 RPMs with very good results using my "piggy back".

 

[QUOTE=double11,Nov 1 2004, 09:01 PM] Possibly, most of my experience is with stand alone (aem) and not piggybacks.

 

most of the work I have done on S2k's has been mechanical & manitnance. I have not tuned an s2k on an ems.

I'm trying to source the plugs and pins to make a harness, because the AEM case won't fit in the stock ecu location.


does the vafc allow you to trim the voltage vs. knock ..

an AEM example on Ski
https://www.s2ki.com/forums/index.ph...pic=182861&hl=



To stay on topic, those are decent numbers from that set-up, I would expect more on a stand alone, and all of the dyno pictures that I posted were stock vs. ems; no other mods, as far as I know.

 

You can get a pre-made a extension harness from http://www.vtecfrog.com/. That's what I used.

 

I had similar results too gernby.
However I lost power if I lower vtec any further. It will be interesting to see how low a standalone computer can lower the vtec engagement point.

 

The V-AFC I does not have any features pertaining to a knock sensor. However, the V-AFC II does have an input from the knock sensor(s). I doubt it has any trim or calibration features. I haven't even seen a V-AFC II, so I'm just going by the feature list on their web site.

 

No dyno sheets of the car yet?

 

can you explain this better?

Lets say for example that w/ the VAFC I add more fuel at idle so it becomes richer than 14.4 at idle. (this is for argument sake only). What will this do to my WOT fuel map settings?

 

V-AFCs can only remove fuel by reducing the MAP voltage by some percentage. You can't really "add" fuel, since that would require increasing the MAP voltage which will look like boost. If the ECU sees a positive pressure in the manifold, it will freak out.

The other issue is that the V-AFC needs to be "invisible" to the ECU when it is in closed loop. Otherwise, the ECU will tune the V-AFC out.

 

When you connect the VAFC you connect it so the ECU doesnt see positive pressure. I got that and naturally thats how i connected mine, so when you are adding fuel this is increasing map voltage so the ECU freaks out? I am adding fuel from 5,000RPM's onwards. How is this affecting the ECU though in open loop?

In closed loop the ECU will take over any adjustments done via the VAFC, understand that, but if I changed any settings at idle for argument sake, will this still affect my WOT settings? im still not clear...