That's a nonissue in the TL, since any coarseness is overshadowed by magnificent intake music, especially as the valvetrain switches over to the high -
lift cam profiles at the fun end of the tach.
At 237bhp it's 20 per cent more powerful than before, and there's a noticeable torque hike when the high -
lift cam profiles kick in at 5600rpm.
The low valve
lift cam profile is used at low to mid engine speeds to maintain idling quality and reduce emissions, while the high
lift cam profile is used when the engine is spinning at mid to high engine speeds improve peak horsepower and torque.
Not exact matches
It might be useful for you to share the
profiles for both stock and aftermarket
cams (
lift, duration).
You basically have an economy - focused
cam profile when driving slow, and a high -
lift performance
profile when going fast.
3 - Stage VTEC is a version that employs three different
cam profiles to control intake valve timing and
lift.
Integration of the jerk curve produces a smooth acceleration curve while the third integral gives an essentially ideal
lift curve (
cam profile).
If we change the phase between these two
cam profiles, we simultaneously alter the valve
lift and duration.
FlexValve uses a rocker system to sum the
lifts from the two
cam profiles.
The engine employs an all - new rocker arm that switches between low - and high -
lift intake
cam profiles to achieve the variable -
lift function.
The
cam lobe
profile selected for engine speeds below 3000 rpm has a duration of 214 degrees and
lifts the valves 5.5 mm.
As engine rpm builds past 4800 rpm, the VTEC system transitions to a high -
lift, long - duration intake
cam profile for superior high - rpm engine power.
As engine rpm builds, VTEC transitions to a high -
lift, long - duration
cam profile for improved high - rpm engine output.
One
cam profile provides low valve
lift, while the other
cam profile has a high valve
lift.
Above 5,800 rpm, the intake and exhaust valves are operated by high -
lift, long - duration
cam profiles, for maximum high rpm horsepower.
As engine rpm builds past 5,350 rpm, the i - VTEC system transitions to a high -
lift, long - duration intake
cam profile for superior high - rpm engine power.
As the engine load changes, electromagnetic actuators allow a movable shaft containing different
cam lobes to shift imperceptibly between high -
lift and low -
lift profiles.
As engine speed builds past 5,000 rpm, the VTEC system transitions to a high -
lift, long - duration intake
cam profile for superior high - rpm engine power.