1993-1998 Toyota Supra High-Resolution Trigger Wheel
The Toyota High-Resolution Trigger Wheel is intended for the following applications:
- 1993-1998 Toyota Supra Turbo
- 1993-1998 Toyota Supra Non-Turbo
All applications using the following engines:
- 2JZ-GTE (3.0 turbo)
- 2JZ-GE(3.0 NA)
- 1JZ-GTE (2.5 turbo)
Congratulations on your purchase of the Toyota High-Resolution Trigger Wheel! This trigger wheel provides a high-resolution trigger input to the Electromotive computer on your Toyota-powered vehicle. This kit utilizes the stock Toyota crank position sensor (magnetic sensor) to determine engine speed and position from the trigger wheel.
Please note that this kit requires welding and machining of your stock trigger wheel.
- Remove the timing belt drive gear from the crankshaft. To accomplish this, consult a manual for your vehicle to determine removal order for the various accessories and covers on the engine. Care must be taken to keep the engine from altering its cam timing! An easy way to avoid cam timing changes is to mark the timing belt, the drive gear on the crankshaft, and the cam gears with white paint before removal of the drive gear.
- Using a lathe (or having someone else use a lathe for you), machine the stock trigger wheel off the drive gear. The stock wheel is pressed on, so only a little machining is required for this. However, it is imperative that the gear be concentric on the lathe. If it is not, the trigger wheel will have too much radial eccentricity. To obtain concentricity, a mandrel may need to be fabricated to hold the gear from the inner machined surface. This is the most accurate way to perform the machining.
- Cut the gear so as to leave a flange in place of the stock trigger wheel. The flange should be 1.945" in diameter. Flange width should be about 0.100"
- Orient the trigger wheel as shown in Figure 1. The tab on the inner diameter of the trigger wheel should be centered in the recess.
- Weld the trigger wheel on to the gear in at least four spots around the inner diameter.
- Put the gear and trigger wheel assembly back in the lathe, once again ensuring that the center machined surface of the gear is concentric with the lathe rotation (if you didn't make a mandrel in step 2, you might want to make one now!). Machine the trigger wheel outer diameter as needed so that it is perfectly concentric with the gear inner diameter. This will ensure that the magnetic sensor is sending an accurate signal to the Electromotive computer.
- Remove any burrs on the trigger wheel from the machining process in step 6.
- Install the gear/trigger assembly back on to the engine, just as you would install your stock gear.
- Run the black wire on the Toyota magnetic sensor to the crank sensor ground terminal on your TEC unit (for TEC-2 units, this is input pin 6). Run the other wire to the magnetic sensor pickup terminal (for TEC-2 units, this is pin 7). There is a third bare wire on the sensor that is connected to the engine block. If noise is present on the magnetic sensor circuit, run a shielded wire from the TEC unit to the sensor. Connect the shield wire to the third wire on the sensor on one end, and to the shield pin on the other end (for TEC-2 units, this is pin 8). A noisy signal will manifest itself as an erratic rpm signal on the engine monitor screen, so be sure to shield your wires if noise is present to prevent engine damage.
If you are unable to perform the machine work necessary to install this piece, most machine shops can easily accomplish perform the work for a nominal fee. Alternatively, Electromotive can perform the machining and welding for a fee. Please call us if this is the case.
Following successful installation of the Toyota Trigger Wheel, you will have an ultra-high resolution crank sensor signal going into the Electromotive computer on your vehicle. Should you need any technical support in your installation, please feel free to contact us.