kstokell

I have seen various information regarding this subject, but can anyone made a wiring diagram?

Thanks
Kevin

AusS2000

It's the same as normal VAFC wiring except that you need to wire in the voltage clamp either upstream or downstream of the VAFC. Just buy a harness.

That said, a V-AFC is no way to tune a supercharged S2000. The main thing you want to do with a Vortech SC is make sure you aren't running too lean. The VAFC adds fuel by upping the MAP signal, but the MAP signal is already too high for the ECU. That's why you clamp it.

I would seriously recommend an E-manage instead. With just the injector harness and software you can add fuel properly by increasing injector cycle.

kstokell

Hi Aus,

I agree the VAFC is not the best tool for the job, but in my case tha AF is not too lean, in fact I may be able to pull a little fuel at high RPM's which may give a little more power.
The main aim is to get a flatish AF and reduce the VTEC engagement point a little, without going E-manage.

Kevin

AusS2000

If you remove fuel with the V-AFC it will advance timing.

kstokell

Is that the case with the Vortech? I thought you it was possible to vary the MAP voltage between 2.5, the clamped value, and 2.9 to give some variation on fuel mix.

AusS2000

The Vortech/Split Second voltage clamp is set lower (2.7V I believe) but it's still kind of kludgey to rely on MAP change and FPR boosting to tune a high tech car.

But the point I was making is that the ECU has a correlation between the MAP value and the igntion timing. In general it's the higher the MAP, the later the spark. So if you reduce the MAP you advance the spark.

I really don't think I'd be hunting for an extra 5hp (when you're up around 300hp) if it means running and A/R with less safety margin.

kstokell

Maybe you're right, I probably won't do to much trying to tune the AF, I'll probably use the VAFC promarily for changing the VTEC engagement piont.

honda9krpm

most of us use the vafc to lower vtec and add fuel with the vortech system, works fine for me and most pple

AusS2000

And how's that engine going?

JohnChan

I lowered the VAFCII vtec point to 5500rpm and it will give me a vtec code if i stay at vtec range for more than 15 sec (i mean 5300 to 5800 rpm and it keep going on and off). The main reason is i track the car and i am only get vtec code at warm up lap. Under normal driving on street and dyno is fine because vtec will not go on and off too many times. After i disable the vtec point on the vafc (let the computer itself to find the vtech point), everything is fine. I think the vtec point rely on the fuel map and the ignition map and they will mismatch in some case like what i did. You can try my setting. 5500rpm L to H and 5300 H to L.
and you will see!
Let me know what you guys find out!