My tuner has mine set to enable at 5200 rpm, and disable at 5000 rpm. Where do you guy's stand on this?

 

Mine goes in at 5200. I am not sure when it kicks out.

 

https://honda-tech.com/zerothread?id=521785

 

From what I have heard the best spot for vtec to come in at is 5500 RPM but that could all change do to your setup. Best advice would to get the car on the dyno and play with it alittle not like it's a hard thing to change.

 

i think it all depends on the cams.

 

Wherever the dyno graph dips, you just keep adding it up higher and higher, until its a nice smooth line.




that is a good example of why vtec needs to be turned up, it may sound cooler at a lower rpm, but you have a better transition from vtec to boost when its higher. I personally have mine set at 5800

(no thats not my graph either, lol)

Jeff

 

good point man

 

If you look at a datalog of a what happens when vtec engages you will see that timing is pulled back on a stock computer. Honda does this to avoid detonation with the sudden intake. The dip you see is caused by the cams but more to the timing being pulled back. If you have stand alone you shouldnt have that dip in there.

art

 

6000 rpm on my ITR cams, which are being pulled dout for GSR's because of the overlap. I don't have cam gears to simplify a little, so don't go off on how ITR are better, GSR's are weak, blah blah blah. We tried to tune out the dip at VTEC on my Z-Dyne, but no amount of timing, fuel etc, made it work any better, so this was the compromise we had to come to.

Anyway, I still had a dip from overlap , even when engaging at 6000!



[edit]I know, I know, weak, and VERY sloppy dyno chart. The smoothing factors were turned off, and my plug gap was blowing out the spark above 7500. SORRY! [/edit]

 

I guess I missed that thread earlier in the week.
We'll I guess I should leave it at 5200 rpm. On all my dyno graphs, I have no dip what so ever. At 5200 rpm it just keeps climbing!