Piggyback Heaven – Installing a SAFC in a MKIV Supra TT

I’ve died and gone to piggyback heaven in the early stages of 2012, as a good friend recently picked up a MINT 1997 Anniversary Edition Toyota Supra Turbo. I have always loved these cars and the insane amount of over-engineering that went into the legendary 2JZGTE.

Since this car is probably one of the ONLY stock Supras left on the face of planet Earth, my friend decides to go slow and just start at BPU for now. Basic Performance Upgrades for the Supra can routinely and reliably push the car into the mid 400 wheel horsepower range.

Here we install an older Apexi Super AFC piggyback fuel controller onto the Supra, just one part of the BPU process.

Things you will need
– S-AFC or AFC NEO – Depending on your preference. My buddy happens to be an ex-employee of Apexi, and he prefers the older AFCII. That’s what we’ll be installing in this writeup.
– 10mm socket
– Wire strippers
– soldering iron and solder
– flux if applicable

First disconnect the negative battery terminal, and open the passenger door to reveal the kickfloor and ECU panel.

Undo the three 10mm nuts and pull back on the ECU cover to reveal the ECU.

Next, take a look at the Supra ECU diagram, you will be splicing into most of the wires, and cutting just one.

Next locate the 40 pin plug, located closest to you if you are looking towards the front of the car. You are splicing the RED wire into pin 31 for switched power to the AFC unit, if you own the AFC NEO it will be the RED wire with WHITE stripe.

Next we locate the primary ECU plug that is part of the plastic shroud, again you want the plug closest to you or E10 for those who have a service manual. You will be splicing the green wire into the RPM signal pin 58

Here is a shot of the green wire spliced into pin 58.

Next we will ground the SAFC, make sure to locate your brown and black wires and FOLLOW the detailed instructions in your AFC manual. You must splice the black and brown wires apart on the ground pin, located on E11 pin 69.

Pin 69 must be spliced and soldered by placing the brown wire (ground 1) closest to the ECU, and the black wire (ground 2 ) an inch downstream of the ECU harness. Here is what you power and ground wires should look like installed.

Next keep the E11 plug in your hand and locate pin 43, which is the throttle position pin. Splice the gray wire into pin 43 for the throttle input to your AFC. Now, locate pin 66 and cut it leaving yourself plenty of room on either end of the wire.

Now take the yellow AFC wire and solder it into the wire you just cut, TOWARDS the ECU. After that take the white AFC wire and solder it into the wire, AWAY from the ECU

I used the Apexi supplied quick connectors on this Supra, as the plans are to move to a VPC or standalone later down the road. Soldering here is optional and not recommended should u have more plans for your 2JZ down the road.

Lastly, you can elect to wire the blue AFC wire to pin 48 on the E11 connector for narrowband 02 readings on the fly.

Now snap the ECU connectors back into the ECU and double check your wires for positive connection. Reconnect your battery cable and turn the ignition to the “on” position.

Once your AFC boots up, you can now make the proper adjustments before starting your Supra.

Select from the MAIN menu, go to SETTING, then to TH-POINT and set your LO value to 94, and then your HI value to 95% throttle.

Select from the MAIN menu, go to SENSOR TYPE and select HOT-WIRE with input values of 1 in and 1 out.

Select from the MAIN menu, go to CAR SELECT and select cylinder 6 with the throttle position in the upward position.

Now, use the NE-POINT menu in ETC to set your NE = 7000 RPM.

Since we are not installing injectors this time around, we will not be modifying the Supra’s low throttle fuel trims at this time.

Next up, installing the downpipe, exhaust and boost controller in the dash to 400 whp.