Electromotive TEC-3 Installation and Setup

Electromotive TEC-3 Installation and Setup

Introduction

I realized shortly after I purchased my Electromotive TEC-3 engine management system that the installation and setup was going to be pretty involved and require some fabrication to make everything work and look like a professional installation. So, I decided at the very beginning of the process to document as much of the fabrication, installation, and setup process as I could. Hopefully, this will simplify engine management installations for others down the road.

Throttle Position Switch

You'll discover several challenges with the "D" shaft Throttle Position Switch (TPS) provided by Electromotive (shown below). First off, it operates in the opposite direction from the 944 throttle body linkage. To correct this, you need to be able to flip the TPS over so that it will actuate in the same direction as the throttle body. However, when you flip the TPS over, the back appears to be solid. The light gray center section of the TPS is just a back cover that can be drilled through to expose the back side of the TPS "D" cam.

Use a center punch to provide a small starter hole for your drill bit. You must drill through the backing plate carefully so that you do not damage the TPS throttle cam. This really isn't too difficult because there is a gap between the backing plate and the cam. Just make sure you work slowly and you won't have a problem. Personally, I used a Black and Decker Bullet drill bit. They make a hole with a relatively flat bottom which allows for easier depth control when drilling through the back cover. Also, make sure that you drill the hole large enough so that the "D" shaft of the throttle body doesn't rub on the sides of the back cover when the TPS is installed.

The next thing you'll discover is that you're going to need an adapter plate to mount the Electromotive TPS to the 944 throttle body. I fabricated mine out of 1/4" aluminum plate. I used 4 mm x 10 mm Allen head bolts to mount the adapter plate to the throttle body. I then slid the Electromotive TPS onto the shaft of the throttle body, marked the location of the TPS mounting holes on my bracket, and drilled and tapped 4 mm holes in the mounting plate for the TPS. I used 4 mm x 20 mm Allen head bolts to mount the TPS to the bracket.

The following picture show the throttle body with the stock TPS removed. Note the "D" shaft coming out of the throttle body and the mounting holes for the stock TPS.

The following picture shows the mounting bracket I fabricated for the TPS and the back side of the TPS with the back cover drilled to expose the "D" cam.

You're probably wondering about the odd shape of the mounting bracket. Well, Electromotive provides a very nice quick disconnect electrical plug with the TPS. However, to provide clearance for the plug (now that the switch is reversed), the mounting bracket must be cut so that it does not interfere with the plug with it is slid onto the switch. I decided to cut both sides of the bracket the same to keep them symmetrical and provide a somewhat "factory" look to the installation of the TPS. The pictures below show why the bracket must be fabricated in this shape and what the TPS looks like when it is completely installed on the throttle body.

Coolant Temperature Sensor

DFU Mounting

MAP Sensor

Inlet Air Temperature

Metric Wrench Set
Metric Socket Set
Jack Stands
Floor Jack

Removal

Installation