toss the throttle body completely?

[isham-research.freeserve.co.uk at pop.pol.net.uk]

> This is actually a great idea, and how the early A1 quattro race
> cars were set up.  If you notice in early pictures of those cars, they
> are still CIS, but the airflow meter is located above the drivers side
> pedal assembly...why?

All of the early cars I've seen and worked on have used Pierburg fuel
injection.

This system has no airflow meter - the metering head is operated by a
Bowden cable from the throttle body.  Instead of the plunger going up
and down it rotates - the 'slits' are triangular apertures.  The whole
metering head moves fore-and-aft against a cam that also rotates - there
are more adjusting screws than you can shake a stick at.

The system was reprogrammed event by event (and even stage by stage) by
replacing the cam with one of a different profile.  I've never seen
such a mechanically complex system.  It is related to the type of fuel
injection system often used in power boats, where the system is
required by law to provide minimum power no matter what breaks.  The
obvious reason in rallying is so that the car can be driven to service,
even if one or all of the Bowden cables snaps.

--
 Phil Payne
 http://www.isham-research.freeserve.co.uk/quattro
 Phone +44 7785 302803   Fax: +44 7785 309674