Tech signal on '87 Porsche 930 Turbo

Installation notes, Data Inputs, Tach Hook up and Software Tips
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Tech signal on '87 Porsche 930 Turbo

Postby psygieda » Thu Sep 11, 2008 1:56 pm

I have TraqSync cable with rpm wire, I ran a cable from the negative side of the coil to the TraqSync wire and connected both. I also made sure the little switch inside the TraqSync cable was moved to the analog side.
Traqmate will still not show any rpm reading.

Am I connecting something wrong?

Please help

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Postby Track Systems » Fri Sep 12, 2008 9:40 am

Do you have a capacitive discharge (CD) ignition? If so, negative side of the coil will not work.
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Postby psygieda » Fri Sep 12, 2008 11:36 am

YES, it is CD ignition type.

Where else can I hook up the wire then?

Thanks

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Postby DieselAddict » Fri Sep 12, 2008 1:55 pm

Is the in-dash tach still working? If so you should trace its signal back and see if that works with the traqmate.

Did the 930 come with a CDI from the factory?

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Postby psygieda » Fri Sep 12, 2008 2:07 pm

OK, I will try the in-dash tech.

I have not changed anything on the car as far as electronics.
So, CDI is stock from factory.

Thanks for your reply.

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Postby DieselAddict » Fri Sep 12, 2008 10:13 pm

I was able to find a wiring diagram for a 1987 911 but not a 930.

I checked the wiring diagram and it is indeed a CDI with the HOT going directly to the coil.

What it shows is the tach leads are black and black/violet.

Check your car and see if you have a black/violet on pin 21 of the DME and a black on pin 11. Those should be the tach signal.

Do you have a service manual for your car and can double check this info?

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Postby psygieda » Sun Sep 14, 2008 7:14 pm

I swill try to verify with my mechanic.

But it makes perfect sense. I'll try to locate the wire and will report back.

Thanks for the suggestions.

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Postby psygieda » Tue Oct 07, 2008 4:02 pm

Finaly connected the blue wire from TraqSync cable directly to indash Techometer this past weekend. Went to the track and got various results. At first the rpm would show as very erratic in TraqMate jumping to 12,000 rpm's at times. Then I started to experiment with various # of cylinders and again same results but more within the limits. I finaly set it to the original value which is 6 cylinders and it seems to work but once the boost hits the needle again goes nuts, I think there is some sort of noise being picked up, but not sure where.
Maybe I should wire directly to the negative side of the coil, but I heard it may not work on my car.
If anyone has any suggestions please let me know.

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Postby DieselAddict » Tue Oct 07, 2008 4:47 pm

Can you make it go nuts by just sweeping the engine across the RPM range or does the boost have to be up?

The thing to do next is to put a scope on it and check the signal for noise. If its noisy there are ways to reduce the problem by building a very simple filter.

Chris

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Postby psygieda » Tue Oct 07, 2008 5:03 pm

All I have to do is blimp the throtle and it will go crazy.

So, how do I get my hands on that filter?

:D


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