Vtec is set at and kicking in at 5500 regardless of throttle position, engine load, vacuum pressure,etc.

Is there an adjustment on this unit to mimic the stock ecu as far as vtec engaging at certain engine load? Tia

 

There should be a low to high and a high to low settings. Low to high 5k for. Mor smiles, high to low for good response at 4300.

 

Nope, unfortunately this is one of the short cuts the unit takes on our car. vtec is only rpm adjustable. You have to find a happy medium between a lower engagement setting you like for more midrange power, and not low enough that your hitting that rpm wile cruising on the freeway or your normal shifting rpm. Your not going to hurt anything, but your fuel efficiency will go out the window.

 

All this setting accomplishes is vtec engagement rpm during acceleration, and then disengagement rpm under decel. Has nothing to do with pressure or throttle position engagement. Still rpm dependant.

 

The Apexi AFC Neo is the first (of the VAFC line) to introduce VTEC engagement based on throttle position. Hi>Lo, Lo>Hi settings are the same, but now there is a throttle percentage value set as well such that VTEC will only engage if you are over that certain throttle percentage at the changeover point.

If you are consistently having issues with cruising in VTEC based on your driving habits, it may be worthwhile to upgrade to the Neo.

 

I wasn’t aware of that, I got out of the vafc game before the NEO was introduced. Id say this feature alone is well worth the upgrade if the VAFC is to be used at all. Id say to any new owners, to get the NEO or don’t bother now that this feature is present.

To the OP, you still run into the issue of not being able to add fuel though (only subtract it) so the VAFC line up still has a major compromise. You can use a adjustable rate fpr to increase fuel pressure to get around that though, then fine tune the fuel curve by subtracting the areas not wanted with the vafc. I think the NEO has an even higher fuel point resolution over the vafc2 for more fine tuning.

You will run lean in the fuel map between the stock vtec rpm (5900) and the new lowered rpm because the ecu thinks you are still running in primary cam, so you will want more fuel in that range at min.

 

Correct. I agree; if anyone is going to use a VAFC product, it should be a Neo at the least.

 

Thanks for the replies.

Noticed there is an adjustment for manifold pressure (kpa). Was hoping you guys would reply, usual suspects

I am monitoring with a wideband. L>h is 5500, h>l is 5400. Engagement Feels smooth. Haven't touched fuel.

 

Did you run into any lean spots between the lowered vtec engagement point and the factory engagement point using the wideband?

I'm looking to lower vtec to 5600rpm with all fuel settings at zero (unchanged).

 

Have you found a good area to set vtec at with the sc? ...and maybe with a tp?

What should tge target afr be ?