333pg333

Any progress on this or similar setups? I'm about to enter this realm pretty soon. Car is being caged now.
I'm not electrically inclined so a lot of this is a bit daunting. I will be running a full standalone which will be supplied with it's own harness. I'm assuming that can run mostly separate from a fairly simplified setup such as the Painless product that will run the ancillaries?

pyropete125

Hi I am wiring up my 87 924S 2.5NA right now. I just want to make sure I am not missing anything. This is a gutted track only car. Master kill switch, start button, and ignition toggle and 5 more toggle switches.

Battery 12+ to kill switch 'A' Side and directly to alternator
Battery 12- ground to body and engine block

kill switch 'B' side to switch panel and starter and Alternator field wire

momentary switch to starter solenoid

DME Pin

1 coil green wire <--- neg side of coil - positive is direct from ingition switch
2 TPS idle
3 TPS WOT
4 start signal <---- not needed - only for fuel pump priming with relays
5 ground shielding
6 air flow sen
7 air flow sen
8 speed sen
9 air flow sen
10 performance data <---- what is this?
11 conn point 4 pin term <----- what is this?
12 test socket
13 NTC II
14 ti signal inj 3+4
15 ti signal inj 1+2
16 ground
17 ground
18 power supply relay <---- 12v+ power in
19 ground
20 ground activation relay <---- fuel pump frounding in conjunction with pin 4
21 conn point 4 pin term 2 <--- tach output?
22 air flow sen
23 shielding o2
24 o2
25 ref mark sen
26 ref mark sen
27 speed sen
28 ground
29 a/c comp
30 altitude correction
31 trig sig for KR <--- what is this? knock sensor?
32 TD input KR <----what is this?
33 idle positioner 3
34 idle positioner 5
35 power supply relay <---- 12v+ in

Master kill switch will power 12v+ to injectors and DME, but which DME terminal is 12v+ in?

ignition toggle - 12v+ to coil, DME pins 18,35, o2 sensor

fuel pump toggle - to fuel pump
fan toggle - control electric fans
aux1 - brake lights
aux2 - tach, voltmeter, any other interior
aux3 -

Anthony Green

Mikelly

Digging this one up from the ashes. I created a PDF and powerpoint of what I did using information from this thread, Tim Pruitt's documentation on the 944Spec FB page, and my own wiring design. I'll be happy to share it with anyone else interested. Just PM me or go to the 944Spec FB page and download it there!

SeaCay

I did this 2 decades ago, so my memory is bit sketchy, but I do recall that the alternator needs a ground for it to operate. Look at the schematic and find the wire from the alternator that goes to the dash. That wire should be grounded with a idiot light in series. When the car is started, the idiot light will glow for a second or so, then go out. This confirms alternator "start up".

Mikelly

Yup. OEM also burried a 65ohm resister as a backup. I’m actually using that resistor and a lightbulb parallel so each backs the other up.

audi2.5tdi

Hi, thanks for your offer. I do already have the 'Current flow diagrams' for 1984 which I think are the same, but I would like to get hold of the schematics if you have access to them.
Thanks from the UK in anticipation.
Ralph

catskill_t

Did you get any answers to these "what is questions"? I am in the process of wiring up an engine that I just installed into a track car that had all of it's wiring removed. The engine has a complete wiring harness which is good. I like to know the which wire can run the stock tach and confirm the 12 volt input pins at the 14 pin connector from the engine harness.

catskill_t

I found this and hope it can help new 944er owners who might use modify their cars for track use. I think this will answer my earlier questions about 12 volt input pins for the DME.

Mikelly

Responded to your PM. Email me and I will send you what I have.