Re: Newbee questions....

[raf40@oes.amdahl.com (Richard Funnell)]

Joseph,

>>>I'm new to the list and had a couple of questions.
>>>1)  Want to add gauges to my 83 QTC, and wondered if that is in the FAQ.
>>> Specifically a temperature gauge, can I just tap off the existing temp
>>>sensor?
>>
>>That's how the water temp gauge was added to my car.  After putting up for
>>years with requiring a bypass to avoid a 4000 rpm cutoff, I discovered that
>>the temp sender tap was the problem.  I disconnected the gauge from the
>>sender, and it pulls better with no 4000 rpm problem.
>
>So are you saying I can go to the junk yard, pull a set of gauges off a
>regular 4000, and connect them to existing sensors on my 83 QTC?  That would
>be wonderful!

I was trying to say the opposite.  You can, however, use the factory oil
temp gauge from a 4000, mounted in the diff lock panel, with a factory oil
temp sender in place of the oil pump plug.  I also just heard that some
Audis have a water temp sender in the fitting connecting the engine to the
rad input hose.

>
>I too had the 4000 RPM problem.  I was reading the service supplement, and I
>only saw a reference to the airtemp sensor (in intake) and the idle switch
>(on throttle body).  As I recall,  if the switch is shorted, or the airtemp
>info is bad, it limits the RPM to 4000.  They call this mode the boost test,
>or such.

I think it's sort of a limp-home mode to protect the engine if something
isn't up to spec.

I went through everything in the supplement, which actually includes at
least 4 things that can cause the 4000 rpm cutoff.  I even buzzed every
wire going to the ecu, and measured every source for resistance.  I have
never seen the condition I found identified as a possible cause.

>>I plan to use a tee (I know, I know - don't use tees with temp senders) on
>>the back of the engine where you will find 2 other water temp senders.  One
>>is a thermotime switch; the other is the dual low temp/high temp switch.
>
>Are these temp senders, or thermal switches?

Switches, I suppose.

>
>>If you can, use the abt panel which will accept 3 additional gauges.  If
>>not, there are several ways to add gauges to the diff lock switch panel.
>
>Any info on where I could get the abt panel and gauges?   ---JCG

None whatever.

Richard Funnell,
San Jose, California
'83 urQ
'87 560 SL