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need some advice on mx5. I hava a 1.6 good chassis and a scrap 1.8 turbo car with good engine so I want to fit the 1.8 turbo engine in the 1600 chassis the 1.8 has ms ecu will that plug into the 1600 loom as read to swop na engines you use 1600 electronic bits and all other of the mechanical 1800 parts but I need to run the ms ecu of the 1.8 an don't really want to spend a day changing loom
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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turbo mx5 experts?Nathan
@bgtmidget7476
Club Retro Rides Member 1
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We have just done the very same thing with 2 NA mk1 Mx5's. We came across issues with the 1.6 loom and 1.8 engine including the TPS which is totally different on the 2 cars, as you have the MS you can get over this by getting a vTPS from a BMW.
To be honest it will be just as quick to remove the Loom and wire it in to the 1.6 car, we found lots of "Gotchas" by trying the quick route.
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Wouldn't the MS wiring be mostly separate from the cars loom, and just spliced in in a couple of places for feeds to switched live, fuel pump and rev counter ect?
On my omex there was only about 4 wires going from the omex loom to the car, everything else just plugged into the engine ancillaries and ecu. I'd imagine the easiest way would be to swap over the MS loom with the 1.8 engine and ancillaries and splice the few wires into where they need to go on your 1.6
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Last Edit: Feb 8, 2016 13:02:03 GMT by roccoguy
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Wouldn't the MS wiring be mostly separate from the cars loom, and just spliced in in a couple of places for feeds to switched live, fuel pump and rev counter ect? On my omex there was only about 4 wires going from the omex loom to the car, everything else just plugged into the engine ancillaries and ecu. I'd imagine the easiest way would be to swap over the MS loom with the 1.8 engine and ancillaries and splice the few wires into where they need to go on your 1.6 no mate on the mx5 they make the ms Ecu plug an play into the std car loom instead of fitting a new loom you can make/buy a new engine loom like with Omex but then I would still end up with the old mx5 loom in the engine bay inless I cut it out but then might as well just change looms over
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We have just done the very same thing with 2 NA mk1 Mx5's. We came across issues with the 1.6 loom and 1.8 engine including the TPS which is totally different on the 2 cars, as you have the MS you can get over this by getting a vTPS from a BMW. To be honest it will be just as quick to remove the Loom and wire it in to the 1.6 car, we found lots of "Gotchas" by trying the quick route. ye mate I heard to fit the 1.8 engine you can use the tps coil pack Ecu ect of the 1600 engine an they run fine but with me needing the Ecu looks like u say it's going to need a loom change
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Loom change would be the best way to do it. I'm not sure whether the plugs/pin outs the same between the 1.8 / 1.6 ECU's but that might give you some issues.
If you do a loom change it might be worth just changing the Engine loom and taping it all up so it can be easily removed in the future.
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Too many projects, not enough time.
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