toss the throttle body completely?

[rob hod]

    the basic flaw with this is that the air plate/distributor assembly is a
beautifully engineered assembly designed to very accurately meter air-mass
flow and deliver a very accurately matched fuel supply to the injectors. It
succeeds in most conditions. What you do by manually moving the airplate is
discard all that design work and make yourself the crappiest simulation of a
slide-throttle carb you ever saw. Also the warm up regulator, which works by
lowering the control pressure and allowing greater plate deflection on a
cold engine is completely defeated. What a strange experiment!



rob
----- Original Message ----- --__--__--

Message: 13
Date: Tue, 30 Jan 2001 09:16:01 -0700
To: quattro at audifans.com
From: DeWitt Harrison <de at aztek-eng.com>
Subject: toss the throttle body completely?

A fellow posted (Turbobricks) the results of a little experiment he
performed on his Bosch CIS equipped ovloV turbo motor. I thought
it was a clever thing to try though probably fraught with difficulties,
such as passing emissions testing. What says the list? What is
the basic conceptual flaw in redefining the air sensor plate to be the
throttle?

DeWitt Harrison
Boulder, CO
88 5kcstq

 > I tried this today. I wired the throttle wide open. Drilled a hole in the
 > top of the 90 degree  hose fitting at the fuel distributor ( directly
above
 > the center of the sensor plate). A  rod (phillips screwdriver) was slid
 > through the hole until it just touched the sensor plate. Started car.
Sensor
 > plate became the only throttle.I had to hold the screwdriver down at
idle.
 > Allowing it  to rise increased engine speed. There was quite a bit of
force
 > pushing up on the screwdriver. It took some practice but  I had it acting
 > like a throttle. The response seemed much better. I can't  think of a
reason
 > why  the drivers foot could not be directly tied to sensor plate. If the
 > original setup could be compared to a constant velocity carburator then
this
 > ,perhaps, could be likened to a Holley with accelerator pump. An actuator
 > (cable??) could be rigged tha allows the sensor plate to rise (open) as
 > apposed to forcing it open. This would keep the mixture correct or
perhaps a
 > little on the rich side during acceleration.
 > What am I overlooking ? Will this work?


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