Wiring tidy up
Discussion
With winter now here, it’s time to look at winter jobs. First on my list is tidying up the wiring in the foot well. It all works fine, but it’s a bit of a mess due to hacking into the old loom for my megasquirt installation, plus there’s a lot of totally unnecessary wiring in the footwell and engine bay. Here’s the current mess!
My megasquirt installation started as a fuel only PnP unit from V8 developments, which uses the existing Lucas loom and ECU plug. I then upgraded to wasted spark which uses a separate loom for the coilpacks, crank sensor and tacho drive. Plan is to remove all the unnecessary wiring, replace the old wiring to the engine bay for the injectors and sensors and build a relay and Power distribution board to tidy up what’s left. This is how its wired up at the moment (or at least my best gues).
I think all the orange stuff and associated wiring to the ECU can be removed which would leave it looking like this, which looks a lot easier to deal with. Just need to check inside the ECU to make sure I'm not planning to ditch anything important.
I have put together a wiring diagram for the new relay board and power ditribution, but then came across this Which might be a neater solution and can replace up to 4 relays. Anyone have any experience with these or SSRs in general?
https://www.holley.com/products/electrical/wiring_...
I have also considered replacing the whole lot with a new ECU (possibly Ms3) and loom, but I think the current plan is probably the best cost effective compromise.
My megasquirt installation started as a fuel only PnP unit from V8 developments, which uses the existing Lucas loom and ECU plug. I then upgraded to wasted spark which uses a separate loom for the coilpacks, crank sensor and tacho drive. Plan is to remove all the unnecessary wiring, replace the old wiring to the engine bay for the injectors and sensors and build a relay and Power distribution board to tidy up what’s left. This is how its wired up at the moment (or at least my best gues).
I think all the orange stuff and associated wiring to the ECU can be removed which would leave it looking like this, which looks a lot easier to deal with. Just need to check inside the ECU to make sure I'm not planning to ditch anything important.
I have put together a wiring diagram for the new relay board and power ditribution, but then came across this Which might be a neater solution and can replace up to 4 relays. Anyone have any experience with these or SSRs in general?
https://www.holley.com/products/electrical/wiring_...
I have also considered replacing the whole lot with a new ECU (possibly Ms3) and loom, but I think the current plan is probably the best cost effective compromise.
Plan is to fit a new loom to replace the old wiring to the engine bay and fuel pump etc. I've managed to find a source for new 14cux plugs so this shouldn't be a problem. No point in replacing the ignition wiring as this is all new and wired to a separate plug on the ecu.
Hopefully with all the redundant stuff removed and the rest of the loose wiring tied back to a new relay board I should be able to tidy up the foot well wiring and get easier access to the ecu etc. The smaller agm battery should help with space.
The MSD solid state relay block looks like a tidy solution for replacing the relays, does the job of 4 normal relays so could be a neat solution. Not cheap though!
Hopefully with all the redundant stuff removed and the rest of the loose wiring tied back to a new relay board I should be able to tidy up the foot well wiring and get easier access to the ecu etc. The smaller agm battery should help with space.
The MSD solid state relay block looks like a tidy solution for replacing the relays, does the job of 4 normal relays so could be a neat solution. Not cheap though!
Edited by angus337 on Monday 18th November 23:06
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