[urq] Many questions...

[Keith Lloyd]

As I understood it, on early WR (I can only speak for Euro cars) the 
wastegate was opened by a feed of pressure from the exhast manifold (small 
tapping near the turbo flange) but later WR's (like mine - 1987) the WG is 
opned from a pressure feed from the inlet manifold and the tapping on the 
manifold is plugged - the plug used is identical to that used to retain 
fluid in OEM brake calipers when delivered prior to fitting (like a large 
allen-head grub screw)
My guess is that it was more reliable to use the cooler air from the 
I-manifold to do the job as this would be kinder to the diaphragm. Am I 
right? I don't know for sure but seems logical.

Regards

Keith

'87 WR



----- Original Message ----- 
From: <craigcook at rogers.com>
To: "Louis-Alain Richard" <laraa at sympatico.ca>; "Martin Pajak" 
<martin at quattro.ca>
Cc: <urq at audifans.com>; <quattro at audifans.com>; <info at dynodoc.ca>
Sent: Thursday, September 17, 2009 1:34 PM
Subject: Re: [urq] Many questions...


I'm pretty sure it's intake pressure acting on the lower wastegate chamber
that opens the wastegate.

Cheers,

Craig.

--- On Thu, 9/17/09, Martin Pajak <martin at quattro.ca> wrote:

From: Martin Pajak <martin at quattro.ca>
Subject: Re: [urq] Many questions...
To: "Louis-Alain Richard" <laraa at sympatico.ca>
Cc: urq at audifans.com, quattro at audifans.com, info at dynodoc.ca
Received: Thursday, September 17, 2009, 5:00 AM

L-A,

> What is the difference between an 80 and a 90 (type 89) model ?

Trim and equipment level, engine choices (usually 4 cyl for 80 and 5-cyl
for the 90). Actual chassis and most of the running gear is the same
example. 90 quattro 10v and 80 quattro have the same drivetrain.

> When exactly does the Audi Quattro was rechristened Audi quattro ?

I think this was when Audi decided to start producing other models with
that drivetrain. circa 1983-84. Probably a slow gradual change, not an
exact moment in time.

> Was there ever a red color from 1981 that was called Venus Red (I just
> read
> that in the new book about the Quattro that I received today, more
> questions
> and facts when I'll have read it a bit).

1980, 81 - Europe - VIN 85A 900001 ->85B 902400
Alpine White, L90E, P1
Diamond Silver Metallic, L97A, Z4
Helios Blue Metallic, LA5Y, W5
Saturn Metallic (Violet), LY4V, Y3
Venus Red, LY3B, G3

No mention of Venus red after 1981

> What is the most interesting old Audi that one would present at vintage or
> historic road Racing, in the same vein as a Porsche or an MGB ?

Of course my '83 80 quattro 2-door ;)
http://www.quattro.ca/1983_80_quattro/80q.htm


> In a type 43 turbo, is it true that it's the exhaust pressure that opens
> the
> wastegate, instead of boost pressure ?

Yes, this is also true for WR cars. My '85 had that system.

Hope this helps

Cheers
-- 
Martin Pajak

http://www.quattro.ca

1982 Audi Ur-quattro, SQ project
1983 Audi 80 quattro, Euro 2-Tür
1986 Audi 4000cs quattro, 2,5 TDI mit 6 gang
1987 Audi 4000s quattro, wintervagen mit 7A und 5 bolt :)




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