How to wire the ECU/Ignition on a 944 race car
#31
Rennlist Member
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?
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?
#32
Instructor
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 -
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 -
Last edited by pyropete125; 04-04-2014 at 12:24 AM.
#33
What we did with our '83 ChumpCar and with forum member schwank's '87 race car was to cut off the keyed ignition and wire the kill switch and push button start off those wires. That would be the easier way to go, I'd think (though I'm not sure how you're doing it currently)...but would mean keeping the existing wiring in there/building a new harness for that piece.
I am trying to wire my 83 944 with a kill switch and push button start, could you exsplain what wires go where?
#34
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!
#35
Thefu
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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".
#36
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.
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".
#37
1983 944 wiring diagrams.
Thanks from the UK in anticipation.
Ralph
#38
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 -
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 -
#39
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!
Last edited by catskill_t; 10-05-2022 at 11:17 AM. Reason: update
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931guru (10-05-2022)
#40