i m going to install my vafc 2 soon to my stock 03 s2k, just wonder what is the best "new vtec point" for a stock s2000?? I m thinking sth around 5200- 5500..........any idea and suggestion?? thx

 

A stock S2000 will loose power if you engage VTEC before 5600-5700, and you have to get the fuel corrections "just so".

 

i have only the t1r exhaust and i set my vafc at 5500

 

as stated by gernby you lose power that low and wil probly make for a rough vtec engagement and the vafc settign will have to be very good to ge t the proper fuel, if i were you i woud lower it 100-300rpms lower or so

 

I left my vtec xover the same and just leaned out my hi-throttle vtec fuel. I would rather not mess with the fuel correcting at this point and don't see a whole lot of need for it, if vtec is 100 rpm before, is that really going to make a big difference, because once your in vtec it stays engaged unless you drop below 5400, which if you drop below 5400 anyway you shouldn't be worrying about your vtec point but rather your own driving and shifting. IMO

 

A stock S2000 will definitely drop out of VTEC higher than 5400. Before I lowered my VTEC using a V-AFC, I would drop out of VTEC at around 5800. It was difficult to stay in VTEC during a 1-2 shift.

 

You can set the VAFC to keep the stock VTEC XOVER but it once engaged, it won't drop out til under 5400 and your still keeping the same XOVER. I even think the stock computer is setup like this, just because it engages at 5800 doesn't mean it drops out at 5799 when WOT.

 

You can certainly set the V-AFC to do this, but the stock setup will drop out much higher. In most atmospheric conditions, it will engage at 5900, and disengage at about 5800.

 

Well I was mostly trying to get across that lowering the VTEC Xover 100 rpm isn't much use for the most part when you can lower the disengagement for when you shift.

 

FWIW, if you aren't going to use the V-AFC to change the VTEC engagement / disengagement point, then you really shouldn't even connect the VTEC wires at all. There are tradeoffs in letting the V-AFC control VTEC, so if you aren't going to reap the benefits, why reap the losses? For example, the V-AFC doesn't look at the oil pressure, coolant temp, MAP voltage, TPS, IAT, or anything to determine whether VTEC should be engaged. It just turns it on or off at the RPMs that you set. There are definitely times where it isn't good for the engine to be in VTEC, especially when the ECU thinks it isn't in VTEC.