Quote:
Originally Posted by Coheed
Why not? Don't split the port and run them like ITBs. you can modify the servo opening rates in the ECM to generate your own tumble at low rpms. Problem solved. Or run dual servos on each side, one as the main "throttle" plate and the other as a TGV.
Or don't use the TGVs as ITBs, but rather use ITBs to generate tumble like the TGVs do in the first place. That's all I'm saying. There are a lot of different ways to tumble the air, or change intake velocity.
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ITBs don't generate tumble. You block off half the intake port so that all the air is going through the valve on one side, generating tumble flow in the cylinder. You need the wall thingy splitting the port because you can't place a valve right over the port. A throttle body upstream doesn't do the same thing. If you try to get rid of the TGV low end combustion quality will be complete crap. If you put a second valve over the TGV assembly to block the whole intake port, sure you can throttle it like that, but adding that would be even more expensive than a separate ITB setup.