PeteyBoy3K
Member
- :
- '04 Mazda3 5d, Titanium Gray
http://www.mazda6tech.com/index.php?option=content&task=view&id=14&Itemid=33
That's a link posted here earlier that describes all of the induction technologies employed on the 2.3 liter mazda engine in the mazda 6
It seems that in my 3s wagon 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)). It seems the 3 doesn't have a VAD (variable intake duct) which basically is a switched, loud, second intake that clicks on at a certain RPM.... 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 inside the manifold to maintain hemholtz resonance, and the VVT (variable valve timing) adjusts adjusts oil pressure in the intake camshaft cog... advancing the timing. Thus the timing and intake manifold length are now optimized for the higher RPM.
Thus, my general gleaning... is that this is a system that involves more parts, but not as effective (or expensive) 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 in addition to timing timing). Toyota's VVT-i also uses seems 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 system, squee!
Is this pretty accurate? one of the things I'm not sure about are the differences between the 6 and the 3. It seems like in the 3, there is some "box" in the wheel well that acts as the VLIM and an intake muffler (which most people talk about removing for more horsepower). It also seems like the 3 doesn't have the VAD on the airbox.
That's a link posted here earlier that describes all of the induction technologies employed on the 2.3 liter mazda engine in the mazda 6
It seems that in my 3s wagon 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)). It seems the 3 doesn't have a VAD (variable intake duct) which basically is a switched, loud, second intake that clicks on at a certain RPM.... 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 inside the manifold to maintain hemholtz resonance, and the VVT (variable valve timing) adjusts adjusts oil pressure in the intake camshaft cog... advancing the timing. Thus the timing and intake manifold length are now optimized for the higher RPM.
Thus, my general gleaning... is that this is a system that involves more parts, but not as effective (or expensive) 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 in addition to timing timing). Toyota's VVT-i also uses seems 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 system, squee!
Is this pretty accurate? one of the things I'm not sure about are the differences between the 6 and the 3. It seems like in the 3, there is some "box" in the wheel well that acts as the VLIM and an intake muffler (which most people talk about removing for more horsepower). It also seems like the 3 doesn't have the VAD on the airbox.
outlet was like 58-60mm but inlet was like 7-8mm!!! The resonator is designed to quiet the engine down....many choose to beleve otherwise but what does the term "Resonator" mean? when you have that down pat...then we will move on. Removing the resonator will not give you mad HP...just free up your air flow a lil bit and give you a sound rewayd when you drop the vtcs. Other than that its the same "MZR" 2.3 VVT(S-VT) engine platform. VTCS is nice. People beleve that you loose a assload of torque when you remove the resonator or install a cai...you don't loose it....you move it farther up the rpm. With VTCS you don't move it too much since it is a intended restriction of airflow. the most you do is let a tad bit more air in so it's not as much of a restriction. and the air is spinning at an even faster rate helping you with the original intent of the valve. With a cai you can tell when it disengages from the tone of the intake. Its like (grrrrrrrrrrRRRRR'B'AAAAAAAAAAHHHHHHHHHHH) 'B'=Vilm and vtcs change forms causing a 7psi spike into the combustion chamber....refered to as the "Supercharger Effect". if you don't beleve me those who havn't reved that far try it...just floor it to like 5500 if you don't wanna go all the way up to 6500...either way wou will feel the car slightly jerk(Not Violent but more of a WOW) forward once it hits close to 4000. you guys can also use that site for how-to for the 3s 6i aplications that involve engine mods. not shure how the atx tranny lines are so the cooler is still in the unknown till someone in the 3s does it.
