MX5 – Dual Throttle Position Sensor

(First posted on MX5 nutz forum in May 2016)

I will only need it if/when I get as far as running injectors directly from the DET3 but I thought I’d see what I could do about providing a proper variable TPS for the DET3 while keeping the OEM 3 state TPS for the OEM ECU.

Had a look at the OEM TPS on the pre charger TB first then had another rummage through my various car spares and found a variable TPS off of a Rover K-series TB. Β Think it was from a 56mm TB I fitted to my Mini.

The Rover TPS has the same D shape hole which was a good start and can be wired to go low or high and it just squeezes between the OEM TPS and the rocker cover.

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Now on to trying to piggy back the Rover TPS on the Mazda one.

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Insides pulled out

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I machined an extended collar to replace the internals of the Mazda TPS and provide a shaft for the Rover TPS to fit on.

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A quick bracket to hold the Rover TPS and allow some adjustment.

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Parts ready to try on the car.

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Finished and wired in to the DET3. Β Not too pretty but it works.

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MAF to MAP conversion and MAF delete next.Β  :D

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