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Old 07-13-2017, 07:31 AM   #1
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Join Date: Aug 2009
Location: Colorado Springs, CO
Posts: 2,837
e30 TPS to e36 Variable TPS Wiring + Adapter + Sensor Kits

I found when turbocharging my car that the standalong Megasquirt unit I had bought needed the throttle position sensor from an m5x motor. As it turns out, the original e30 TPS is a switched style sensor with an idle, cruise, and wide open throttle switch. The solution is a variable TPS from an e36 or m50 engine. This potentiometer style sensor gives the voltage signal megasquirt is looking for based on throttle percentage open. Here is an image showing the two sensors.

It is true that the e32/e34 automatics had a TPS with both the potentiometer and the switched style sensor build in one. As it turns out this sensor costs $300 these days and the connector does not connect to the e30 style engine harness so some custom wiring must be done. Here is a photo of that sensor.

To make the e36 unit work with the e30 wiring harness a couple things must be done:

1. Source e36 TPS sensor
2. Build or purchase custom bracket to mount vTPS to e30 throttle body
3. Modify wiring harness by switching 2 wires so megasquirt sees correct TPS signal.

I am working on solving all 3 problems in one easy to install kit and/or individual components. The kit would include:

1. A brand new variable TPS sensor
2. An M50 Throttle Position Sensor to a M20 Throttle Body Adapter
3. An M50 TPS to M20 Engine Harness Wiring Adapter using original style connectors

The benefits to this kit include it being totally reversible. You can remove it and revert back to stock TPS and motronic. There is no wiring, no hassle, and no headaches. This is a direct plug and play solution with all the headache taken out of it. The bosch style connectors fit right into the e30 engine harness and the TPS sensor. The wiring adapter will swap the necessary wires and the bracket will bolt right up to both the throttle body and the sensor and come with all necessary mounting components.

I have ordered and received parts and am about to assemble these units but would like to set up a feeler and group buy. Please let me know if you are interested and if you would want the full kit, the kit without the sensor, or just the wiring adapter or tps adapter bracket and hardware. I am trying to price the adapter kit without the sensor at $89 and with the sensor about $135 shipped. The wiring adapter only would be cheaper, somewhere around $45 shipped.


*** I am looking into a few other adapters including GM IAT Sensor to Bosch style AFM Connector, maybe a DB37 connector, and a Bosch 35 pin to 55 pin adapter so motronic 1.0/1.1 guys can run megasquirt. ***
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Old 07-15-2017, 08:36 PM   #2
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Join Date: Aug 2009
Location: Colorado Springs, CO
Posts: 2,837
I build my first prototype tps adapter and it worked. Here area couple of pictures. I didn't use heat shrink or the rubber dust boots on this one in case I had a problem. Here are a few pictures as well as once I installed it on my car and tested it. Note I am using a homemade adapter bracket not the one that will come in this kit.

I did a datalog, but ignore the AFR readings as i am running the engine on basically stock Motronic 1.3 with a narrowband oxygen sensor.
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Old 07-16-2017, 09:44 AM   #3
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Join Date: Jun 2013
Location: CO
Posts: 275
Good to hear it works. This would be nice to have had before I did my swap. Still one I'd probably get for one of my other M30 cars.
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