Why does the vtec go on so late in the rpms, instead of midrange rpm my redline start at 7000, and goes on at about 5700. D16y8. also is it bad to run your car that high in the rpms semi-often. Thanks for any help

 

vtec switches cam profiles at the optimum point of crossover for the cam's profiles. i.e. the lower rpm's run on one profile of the cam & when that profile is about to stop making good power vtec switches to the high rpm profile to continue the build of power. by lowering vtec engagement on a stock cam you will probably run a little slower. you shouldn't worry about it unless you get an aftermarket cam. hth

 

my vtec kicks in around 6000RPM or higher. I am thinking because my ECU or something is messed up maybe my Coolent Temp Sensor but never the less it helps me save gas

 

sounds like your vtec is engaging just a little late. If an engine is meant to be redlined, I would have to say hi rpm is alright, as long as your aren't bouncing off the rev limiter. Reason why it could be bad cuz your valves can float and pistons can essentially slap those valves and break stuff.

 

I don't know but I know my car is running good my DYNO can back it UP

 

A SOHC can have 2 different profiles?? and what would be a safe number to run my tach??