For those of you with boost that changed the vtec crossover, what did you set it to and why?

 

6300... just made more power there

 

4000 rpm. I might go a little lower. It adds mid-range torque.

 

4400 rpm but may move it back to 4500 rpm or so to help alleviate the pre-vtec dip.

 

My "tuner" set mine at 4900, but I'm going to redo it when I up the boost. There is a nasty drop in power at crossover, and timing doesn't fix it.

 

Hmmm... the general consensus seems to be 5000rpm? I'll be using an equal length.

 

I only had to back mine down by about 100 rpm from stock; I think it's around 5700 now. We did this to smooth the transition from low cam to high. The low cam seemed to level out or run out of power at 5800 rpm just before the switch to high cam when it was left at stock.

 

I think that I have mine set at 3600 at the suggestion of the tuner.

He 'says' that you go lower w/ superchargers and higher w/ turbos.

There are a number of things that restrict it from engaging. Something lke +70% throttle position, sufficient oil pressure, sufficient water temp.

so I can be at 5600 but not in Vtec, because i'm not stomping on the throttle.

I hope that you aren't as confused as me.. LOL

I Run an AEM.

 

bump...

 

6100 rpms. If you look at my dyno sheets in my 'retuned w/ bigger fmic' thread that was about a month ago, you'll see my base dyno has a HUGE dip in it from where Inline Pro set it to 5500 that lasts for a good 500-800 rpms and then continues going back up in power close to 6500 rpms. Mase raised it and the car made more power there in addition to more peak hp/tq and also felt smoother.