- Sun Jul 01, 2007 2:24 am
#12779
Adjusting the VTEC (or VTEC-E for that matter) crossover point using the stock cam and cam gear results in only one thing: a loss in power.
VTEC-E is a completely different system than VTEC and you will not want to use a VTEC ECU on a VTEC-E motor.
VTEC-E runs on 8 valves until about 2500 RPM and then it switches to 16 valves. This results in better low end power than on your standard 16 valve motor.
VTEC motors run all 16 valves all the time. They have the low cam lobes optimized for low end power. This would normally result in a huge power drop off in the mid-high (4500+) RPM. This is the point at which VTEC activates and the valves switch over to a higher lobe with different timing and duration optimized for top end power. Essentially VTEC is like having two intake cams in one (and two exhaust cams on DOHC VTEC motors). A low end cam and a high end cam.
At low RPMs you want a small air passage so that the air flows quickly. At high RPMs you want a large air passage to allow a higher volume of air and you can rely on the motor to pull in air at a good speed.
Referring to VTEC "popping" or even caring about the VTEC sound over the actual power output is rice, pure and simple.
VTEC-E is a completely different system than VTEC and you will not want to use a VTEC ECU on a VTEC-E motor.
VTEC-E runs on 8 valves until about 2500 RPM and then it switches to 16 valves. This results in better low end power than on your standard 16 valve motor.
VTEC motors run all 16 valves all the time. They have the low cam lobes optimized for low end power. This would normally result in a huge power drop off in the mid-high (4500+) RPM. This is the point at which VTEC activates and the valves switch over to a higher lobe with different timing and duration optimized for top end power. Essentially VTEC is like having two intake cams in one (and two exhaust cams on DOHC VTEC motors). A low end cam and a high end cam.
At low RPMs you want a small air passage so that the air flows quickly. At high RPMs you want a large air passage to allow a higher volume of air and you can rely on the motor to pull in air at a good speed.
Referring to VTEC "popping" or even caring about the VTEC sound over the actual power output is rice, pure and simple.