MAC01 and MAC02

[quk@sievers.com (Phil Payne)]

In message <1996Sep26.100856.1251.461135@spoke.ball.com> dlawson@ball.com (Dave Lawson) writes:

> I was going over an 82 euro ur-quattro the other day and got another
> data point on US/euro car differences.

Go over any two 1982 euro urqs and you'll find differences.  We ain't jokin' 
when we say there are no two the same.

> An obvious difference is the fuel system dampers are missing on the euro 
> cars.

Watcha mean?  The little noise suppressors?  They appeared unannounced in 1986.

> And checking the 82 car confirmed this and I also notice that the O2 freq 
> valve is absent. Checking the exhaust manifold, there is no O2 sensor, not 
> even a boss for it. So, the early euro cars run open loop on the fuel
> system. This 82 has no cat. I also think the fuel distributors are 
> different, but didn't write down any part numbers.

Yup.  We're cat-free until the 1990 20V.  My 1988 MB engine is still open loop, 
in your terms.

> More checking on the exhaust manifold revealed a metal pipe which
> was tapped in forward of the turbo, which went rearward and was
> used to actuate the wastegate. On the US ur-quattros, the wastegate
> is actuated by boost pressure before the throttle body, not pressure
> inside the exhaust manifold.

All unmodified WRs use exhaust pressure to control the wastegate.  The inlet 
manifold casting, even on the earliest cars, has the pre-throttle bleed channel 
cast into it and blanked off.

> Another difference I had never noticed before, was for the rear seat belts.
> The euro car had no bolt attachments in the C pillars for the rear outward
> seat belts. The back seat was filled with parts so I couldn't check for the
> lap belts.

Odd.  I've never thought about my rear anchorages.  I'll check tomorrow.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club