personally i never found it necessary to lower vtec crossover. when i dragged my EH9 i used to launch at about 5800 rpm, then after each shift the revs would only drop back down to 6k, which is still well above standard vtec crossoverWatch where you set the engagement for you VTEC. For a B16 that is too high. When we tuning my B, we actually lowered it to 4400 RPM and it picked up alot more.
I have a chipped P28 that I tuned with a wideband. It was tuned, but the air at 3300 feet is much less dense then at sea level. According to a chart I was looking at, that altitude difference should make a .7 second difference.WIthout a fuel management system on that, I bet you were runnin a bit lean too? Mountain air really sucks when you're trying to get power out of a motor...
personally i never found it necessary to lower vtec crossover. when i dragged my EH9 i used to launch at about 5800 rpm, then after each shift the revs would only drop back down to 6k, which is still well above standard vtec crossover
now unless you're autox-ing, then maybe it might be justified....
curves are more fun anywaysI auto-X quite a bit so that made a difference. I don't drag hardly at all anymore. But I do know that on built N/A it does help to lower the VTEC engagement slightly.
You need some back preasure
my best guess was 60' in the 2.3 - 2.4 range...Yea well I think 6000 is a little late for vtec engagment. 5 something will probably be better. The lane that he was racing in the 60 foot sensor wasnt working so we didnt get to see his 60 foot. His time slip went as follows..... (BTW this is launching at about 3000 to 3500 rpm)
T1 : ----
T2 : 6.574
T3: 9.917
MPH (T3) : 72.968
T4 : 12.794
ET : 15.255
MPH : 89.758
This is for a 92 dx hatch with a b16A3 with short ram intake, 4-1 header with cat and resinator and stock piping. And all interior.