EGR deleted, now to disable the intake Butterfly’s

[kow1]

After my previous post, I’m disabling the 1KZTE EGR system. Disabling the exhaust valve is easy enough but previous posts say the intake constrictors (butterfly’s) also need to be disabled. Failure to do this they say can cause smoke and increased mpg. I can only guess that this is caused by the increased manifold vacuum as now there is now no flow in to the intake manifold from the exhaust?

The Denso V3 pump book says the butterfly has 3 positions:
Butterfly fully open - When cold, de-accelerating and high speed operation. Both actuator chambers at atmospheric pressure. VSV’s off.
Butterfly half open – Normal driving when warmed up. Inner actuator chamber VSV on, Outer actuator VSV off.
Butterfly fully closed – Stopping the engine. Both actuator chamber VSV’s on.

So most of the time the butterfly is half open – possibly to increase the manifold vacuum to help suck is those EGR exhaust gasses into the intake manifold.
Also the butterfly needs to be closed during shutdown to turn it off smoothly.

With the EGR gone it seems then that the valve should be open all the time except at shutdown. To achieve this, the vacuum lead from the inner actuator could be removed, leaving just the outer for the shutdown. It could be though that it needs the grunt of both actuator’s to fully close the butterfly. If this is the case then both actuators could be tee’d off the 2nd VSV?
Of course I may have this all completely wrong. Has anyone tried something similar or have any comments?

[kbushnz]

Nope not tried that, I just removed it completely..
Not to say it wont work...

And yes shut down a little rough but not an issue....
In fact now I have no throttle body at all

[tweake]

quickly reading through i think you have it about right. shutdown often requires both vsv to operate and go to just one actuator.

however i suspect the main butterfly does the bulk of the restriction and that is operated by the throttle cable.