Tach Signal for 20v engine in type 85 IT WORKS!!!!!!!!

[Mihnea Cotet]

Oh yeah, just did it 20 minutes ago, the procedure is very easy. Just hook
up a wire between the coil's 1 terminal and the B1 terminal at the fusebox
and that's it! It works perfectly from 500 to 7400 RPM, just tried that
:-)))) So Alan, here's your solution. BTW, finding the B1 terminal is much
easier if you have a spare fuesebox laying around for orientation purposes :-))

Just my 0.02,


Mihnea


At 16:52 17/09/2002 -0600, Bruce Bell wrote:
>For the 3B you should be able to take the signal from the coil. If you want
>to use the ecu, required with the AAN, then you must send the tach out for
>Conversion to Motronic 5 Cyl signal
>
>here are quotes from someone with a BTDT with an AAN into his urq.
>
>"Well, the tach modification appears to have worked. FWIW, the movement
>appears to be more damped than previous, but not excessive damping.
>In fact, it looks pretty good."
>
>He sent his to:
>
>North Hollywood Speedometer
>6111 Lankershim Blvd.
>North Hollywood, CA  91606
>
>(818)761-5136
>Fax (818)761-4857
>
>For the AAN you will also need a signal to pin 50 for the vehicle speed
>sensor. Try using the speed sender on the back of your speedometer, the one
>that drives the cruise control. One side to ground, the other to ecu.
>
>"So there I was...rolling down the expressway...and "blink"
>goes the check engine light....read the code and 1231....
>Vehicle Speed Sensor."
>
>Bruce
>
>
>-----Original Message-----
>From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
>Behalf Of Mihnea Cotet
>Sent: Tuesday, September 17, 2002 12:34 PM
>To: Alan Kramer; quattro at audifans.com
>Subject: Re: Tach Signal for 20v engine in type 85
>
>
>Alan,
>
>
>I can't answer your question for the moment because my 3B coupe quattro
>doesn't have the tach hooked up yet, but I'd like to hook the Motronic
>signal to the normal entry point if I could find it... could you tell me
>where you hooked it up? Or did you use the existent ignition coil wiring
>harness?
>
>Thanks,
>
>
>Mihnea
>
>
>'85 Coupe quattro 20vt
>
>
>At 10:01 17/09/2002 -0400, Alan Kramer wrote:
> >For those of you out there using a 20v motronic ecu with a type 85 tach,
>are
> >you using the tach signal from the ecu to drive the tach or tapping into
> >terminal 1 of the coil and driving the tach similar to the way it was in
> >stock type 85 form?
> >
> >Thanks,
> >Alan
> >
> >'83 CGT 20vt
> >'90 v8q
> >'86 4kcsq
> >
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