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Discussion and questions related to the course Practical Motorsport Wiring - Club Level
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I'm creating a CANBus network in a 1990 Mazda Miata using an MS3Pro PNP ECU and a few devices. I'm looking for feedback on routing and terminating the network.
I am putting four total connections on this network:
1) ECU, which has an internal termination resistor
2) AEM X-Series wideband controller (Connection near ECU in passenger footwell)
3) Banks iDash (Connection near steering column)
4) Expansion access point (Engine bay)
I have two ideas as to how lay this out based on my understanding of CAN networks. Layout 1 puts the ECU at one end with the termination resistor. Layout 2 essentially has a ~1m stub which is much longer than I've seen recommended. Layout 1 seems to be the more "proper" way to terminate the bus, but layout 2 would make for less physical wires as I won't need two separate runs into and out of the engine bay. Is there a way I can make layout 2 work with different termination?
Thanks in advance!
Attached Files
Layout-1.png
- Layout-2.png
It depends on how fast you're looking to operate the bus. I've had to help folks with stub layouts similar that would punt errors at 1Mbps - but hum along at 500k - others didn't. When in doubt though I'd daisy chain as per the spec.
