Re: 4KTQ Conversion Questions

[Scott Mockry <scottmo@teleport.com>]

Scott Mockry writes:
>> The early (1/85-7/85) '86 model year 5000TQ with the MC engine used a fuel
>> distributor with banjo type injector lines and according to the Bosch parts
>> catalog, the replacement (rebuilt) fuel distributor "FD70X" for this early
>> MC engine is also shown as the replacement part for the US 83-85 ur-quattro
>> with the 2.144cc WX Turbo engine.
>> This would seem to indicate the ur-quattro fuel distributor would work on
>> the MC engine.

Phil writes:
>Simplistic, from my point of view.  The fuel metering head you refer
>to is the -147 (Bosch numbering) unit - my ur-quattro already has the
>-153 (Bosch again) fitted to the MC-2 engine.

Yes, the comparison was simplistic, but it appears to be correct, "if"  the
info I just looked up in the Bosch data base is correct. Let me know if I
am mistaken here.

Actually the fuel distributor I referred to above should be the 0 438
100-123. This number is shown for the MC engine, and I believe it is the
one that uses the banjo type fuel injector lines. The data base also shows
the -147 fuel metering head for the MC engine. This is what is fitted to
the later 1986  1/2 to 88 5000TQ with the flared fuel injection lines (not
the banjo type). My 87 5000TQ uses the -147

The Bosch data base shows the WX (1983-85 US ur-quattro?) to use the 0 438
100 -123 fuel distributor as well. Can anyone with the US version
ur-quattro verify this?

Scott said:
>> The Bosch parts book does list a different air flow metering assembly for
>> these two vehicles, as well as different warm up regulators.

Phil said:
>That's essentially just a different piece of plastic because of the
>different air filter.

I was referring  to the cast aluminum air flow metering plate assembly,
counter-weight etc. and not to the plastic air filter housing. I assume the
plastic air filter housing is a separate part number than the Bosch
supplied air flow metering assembly. Is that correct?

According to the Bosch data base: 
The WX is shown to use the 0 438 120 146 (1983 ur-quattro), (-193 for the
1984-85 ur-quattro) air flow metering assembly,  and the early 1986 MC
shows the use of the 0 438 121-040 air flow metering assembly. The 1986 1/2
to 1988 MC uses the 0 438 121-053 air flow metering assembly. 

I "believe" the early 89 200TQ with the single knock sensor MC also uses
the 0 438 121-053. The later dual knock sensor MC engines in the 1989-90
200TQ use the 0 438 121-064 air flow metering assembly as does the euro 1B
engines according to the Bosch data base. 

Phil, Does your 100 Avant have the 1B engine?

Scott Said:
>> The later dual knock sensor MC engine (89-90 200TQ) uses the same fuel
>> distributor as the earlier 86-88 5000TQ MC engine, but uses an externally
>> mounted system fuel pressure regulator instead of the one inside the fuel
>> distributor. The dual knock MC also uses a different air flow meter
>> assembly part number.

Phil asked:
>Sure?  The ur-quattro changes from -147 to -153.

No, actually I am not sure, as I just looked at my 87 5000TQ, and it indeed
does have the -147 fuel distributor metering head with internal pressure
regulator and my 1989 200TQ dual knock MC has the -153 with the external
pressure regulator. 

 I originally thought the single knock MC and the later dual knock MC had
the same fuel distributor, as I ran across a fuel distributor/air flow
metering assembly out of an early 1989 200TQ with the single knock MC
engine, that had the  -153 fuel distributor and it had the internal
pressure regulator installed. It also had the early 0 438 121 053 air flow
metering assembly. Possibly the Monkey lads worked on that car!

These numbers are giving me a headache!
HTH
Scott