I can tell you this, even trying "not" to accelerate on the upshift, it was hard not to a little, especially on the 1>2 shift.

On your final point, I tend to agree. The car is accelerating hard and by the time the clutch fully hooks up you'll be very close to VTEC if not still in VTEC when things get going.

I've noticed on my car, when doing a max effort acceleration, that I sometimes get a hard surge on the upshift in the first three gears. I've always though it was because I wasn't letting off the throttle as much as I should be. Is this a symptom of the clutch slipping from that "delay" valve everyone keeps talking about?

As for your last two questions. In the 2+ years I've been loitering around this forum, they've been asked a number of times, especially the part about disengaging at a lower rpm than it engages at. No one, to my knowledge, has been able to confirm or deny either question to date. Honda certainly seems to be keeping mum about it.

Drive Safe,
Steve R.

 

Hmmmmmm.

I've not seen a definitive answer on these boards yet either (hence my questions ).

However, I do seem to remember a mod that Modifry came up with to use a blinker indicator on the display panel to indicate whether VTEC is engaged or not. I also remember a variation in which you can at and LED somewhere in the car as a VTEC indicator instead.

The ECU is determining when the car is in VTEC, and thus there is a signal coming from the ECU to engage VTEC. Modifry tapped into that signal, which would then light the indicator when the ECU is sending a signal to engage VTEC. From this mod, we shouldn't necessarily be able to figure out ALL of the logic behind engaging or disengaging VTEC (unless it is as simply as above/below 6000 RPM), but we sure would know when we are in VTEC and not in VTEC. This would go further to prove (or disprove) that while theoretically the 04 should drop below 6000 on the first two upshifts, that realistic shifts during quick acceleration would not cause a drop out of VTEC.

I've been thinking about doing this mod to my Civic (but there are plenty of other jobs I NEED to do before adding fun stuff). I will most likely add it when I get my S (planning on an 05 early in the year).

If you want to know more about this mod, I just found the link.

http://www.baustnet.com/honda/mods/vtec/vtec.htm

Chris

 

If you look at the VTEC transition point there is some potential to pick up some HP if you lowered the engagement point down to 5500 RPM. The only draw back is you won't get the sudden rush at the 6000 RPM changeover point since you'd be smoothing out the curve.

I think this is why you don't "feel" the VTEC transition point in other Honda engines that have i-VTEC like the RSX.

I think if somebody came up with a simple mod to drop the VTEC point down 500 RPM it would be work checking out.

 

this is incorrect, simply changing the VTEC point won't help, you need to modify your timing and fuel curves as well.

 

I do not have numbers about the power, but I have driven the cars back to back, and the 2004 is quicker. The 0-60 issue is an anomaly of the gearing changes, IMO. The tests I have seen where they tracked the cars show 2004 was about a second quicker around the circuit, which is a lot. That is the bottom line of the all the dynoing and chatter on this topic for me.

 

yes your butt dyno

bottom line is faster 1/4 time time #s would prove it! But Nope they are all the same. Sorry bro.