I'm thinking bout getting a VAFC II, I'm wondering if lowering VTEC engagement from 6800 to like 5500 will make a decent diff. Decent being at least .2 secs on quarter. I'm not really looking to improve drag speed but rather get lil more oomf from the motor.

 

I would try it out. No harm in testing. Try the original setup then lower it.

 

there have been some people on this board who have lovered to 5800 and had positive results try a search under vafc and see what u come up with.

 

vtec engagement is around 6000rpm....but it also depends on airflow/throttle position/atlitute....... lowering the vtec is basically to even out the power curve.... so instead of having a slight dip in power while it transitions from low cam to high cam.... the transition is smoothed out.... people have gained around 5 to 10rwhp with the vafc tuned...

 

ohh by the way.. i have a brand new one for sale if you're interested....

 

You have the black VAFCII?? How much? Do you have any info ie sites on proper tuning for S2k?

 

yeah i have the black one.. it's brand new. never used, never opened, still in original package.... and umm on tuning... there's no baseline.. you can either take it to a dyno and get it tuned... or you can test and tune it yourself....

ps.. sent you a pm on the price....

 

Send me that pm too.

THX

 

Also in response to the original question, lowering the VTEC engagement point shouldn't gain anything for your 1/4 mile time, because if you are actually trying for a fast 1/4 mile time, you should never be below 6000 RPM anyway. If you gain any time in the 1/4 by using the VAFC, it will be from leaning out the fuel mixture which will give you a bit more power (most noticeable above 8300 RPMs on the pre-04 models).

However, for non-1/4 mile driving, I think you can gain some power between ~5400-6000 RPMs by lowering the VTEC engagement point to 5400. I've found this helpful at autocrosses and track events, because I don't feel the need to downshift if I drop down to the 5500 RPM range in a corner.

Here's an example of the improvements made by tuning the VAFC on my car:

 

nicely done. and nice dyno graph mxt77