http://www.mazda6tech.com/index.php?option=content&task=view&id=14&Itemid=33
that's a link that describes all of the induction technologies employed on the 2.3 liter mazda engine in the mazda 6
as far as I know.. I have VVT (variable valve timing), VTCS(variable tumble control system), and VLIM/VIS (variable length intake manifold/Variable Intake System (as mazda calls it)). I do not have VAD (variable intake duct) which basically is a switched, loud second intake that clicks on at a certain RPM.... it seems like those are only on the mazda 6... instead, I have an intake muffler in the wheel well combined with the VLIM that lots of people like to take off in favor of a Cold air intake.
but yea, as far as I can tell, I have a power/time line
as I rev:
at 3750, VTCS (variable tumble control system) clicks off, meaning that the small butterfly valve right before the intake chamber stops restricting airflow to make the air more turbulent and mix with fuel better. Mazda says this is for emissions and not torque.
at 4500 RPM, the VLIM (variable length intake manifold) adjusts a valve to maintain hemholts resonance, and the VVT (variable valve timing) adjusts the positioning of a cog turning the intake camshaft so that the timing and intake manifold length are now optimized for the higher RPM.
My impression: this is a system that involves more parts, but not as effective as honda's VTEC... which instead of using a VVT actuator on the intake cam to increase or decrease the timing... just has a camshaft that can be shifted left or right by a servo to change the cam profile (thus, actually adjusting the valve lifts and timing, not just timing). Toyota's VVT-i also uses a special camshaft but I don't know as much about how it works.
Mazda opted to use the more sane VVT actuator in combination with VTCS to have the same effect that the variable valve lift of VTEC gives.. but the torque band is really only shifted and not as broadened as they are in VTEC engines.
but yea, finally found something describing mazda's systems, squee!
How does the 3 differ from the 6? As far as I can tell... it seems that the 3 doesn't have a VAD, and they somehow combined an intake muffler with the hemholtz resonator in some sort of box in the wheel well.
that's a link that describes all of the induction technologies employed on the 2.3 liter mazda engine in the mazda 6
as far as I know.. I have VVT (variable valve timing), VTCS(variable tumble control system), and VLIM/VIS (variable length intake manifold/Variable Intake System (as mazda calls it)). I do not have VAD (variable intake duct) which basically is a switched, loud second intake that clicks on at a certain RPM.... it seems like those are only on the mazda 6... instead, I have an intake muffler in the wheel well combined with the VLIM that lots of people like to take off in favor of a Cold air intake.
but yea, as far as I can tell, I have a power/time line
as I rev:
at 3750, VTCS (variable tumble control system) clicks off, meaning that the small butterfly valve right before the intake chamber stops restricting airflow to make the air more turbulent and mix with fuel better. Mazda says this is for emissions and not torque.
at 4500 RPM, the VLIM (variable length intake manifold) adjusts a valve to maintain hemholts resonance, and the VVT (variable valve timing) adjusts the positioning of a cog turning the intake camshaft so that the timing and intake manifold length are now optimized for the higher RPM.
My impression: this is a system that involves more parts, but not as effective as honda's VTEC... which instead of using a VVT actuator on the intake cam to increase or decrease the timing... just has a camshaft that can be shifted left or right by a servo to change the cam profile (thus, actually adjusting the valve lifts and timing, not just timing). Toyota's VVT-i also uses a special camshaft but I don't know as much about how it works.
Mazda opted to use the more sane VVT actuator in combination with VTCS to have the same effect that the variable valve lift of VTEC gives.. but the torque band is really only shifted and not as broadened as they are in VTEC engines.
but yea, finally found something describing mazda's systems, squee!
How does the 3 differ from the 6? As far as I can tell... it seems that the 3 doesn't have a VAD, and they somehow combined an intake muffler with the hemholtz resonator in some sort of box in the wheel well.