Discussion and questions related to the course Motorsport Wiring Fundamentals
I'm planing to build my own LS3 harness for LS3 engine for motec M84
and I'm want to know how to connect my sensors and coil packs and I have come douts about it
crank position sensor (ref ) I connect it to ( 0V ,signal, 5V ) is the source 5V or 12 V ?
cam positon sensor (sync) (0V ,signal , 5v) is the source 5V or 12V ?
about bank 1 and 2 coil pack and connector have 7 wires (A,B,C,D,E,F,G,H) , ( A )gose to GND , D not used, H gose to 12V power supply how I connect the rest of wires regarding the fire order ?
My LS3 harnesses have used 5V for both Crank and Cam. There are two different sensors that have the wiring slightly swapped. I believe the current crate engines are coming with the gray 58 tooth crank sensors, wiring is A=Signal, B=Ground, C=Power. Same order for the Cam connector.
The coil packs are:
A - Power Ground, B - Ign Cyl 7, C - Ign Cyl 5, D - N/C , E - Signal Ground, F - Ign Cyl 3, G - Ign Cyl 1, H - Ignition Power
A - Power Ground, B - Ign Cyl 2, C - Ign Cyl 4, D - N/C , E - Signal Ground, F - Ign Cyl 6, G - Ign Cyl 8, H - Ignition Power
With the M84, you have to wire the ignition outputs in firing order. The LS3 firing order is 1-8-7-2-6-5-4-3.
You would be advised to get a factory service manual for the engine so you have a wiring diagram of the stock harness.
thanks for your information
the wiring loom from motec connect sync sensor and ref sensor with 8V do I have to change it to 5v or I keep it the same ?
I'm sure it will work with 8V, that is a stable reference voltage.