Originally posted by Epoch
Though... this raises a question that I wondered about... does the VTEC system _only_ allow an increase in the cam lift and duration, or can it offer a decrease? Kinda curious if you can set up the VTEC cams in a turbo'd system to reduce the overlap when in the upper RPMs, allowing the turbo system to effectively pressurize the cylinders better with less blowby? Yet, in the lower RPMs, allow the right amount of overlap to purge the exhaust gas and (maybe?) speed up the spooling or the turbo? *fantasy*
You can have it do anything you want. It's a whole new cam lobe.
Originally posted by 99DCtwo
there will balways be a power drop when you engage vtec, take a look at your dynos always see a slight power drop and then it raises no matter when you turn on the pay check, your car doesn't say right at 4000 rpms exactly like the the very microsecond that the 1st cyl. hits v tec starts its lags the entire drive train down a bit to start moving the secondaries!!!!!!!!!
I see no drop in power....
That dip is due to poor timing of VTEC engagement combined with cams that are too aggressive for the RPM range they are being used in. Proper tuning will eliminate it.