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Case Studies : Apexi Super AFC Wiring Diagram : How to install a AFC.

While the age of the piggyback computer is slowly coming to an end, many enthusiasts would be remiss to overlook the benefits of adding a piggyback such as the Super AFC to their vehicle for tuning flexibility.

So people have been asking for diagrams and sending questions regarding the APEXi SAFC unit. I have included a scanned image displaying the wiring diagram and how to install steps below :

And here are a few links to previous Case Studies where we install the AFC and tune it.

Installing SAFC into a MKIV Supra

Installing SAFC into a Dodge SRT-4

Tuning SAFC – How to tune your car for dummies

Happy tuning!

 

Case Studies – Project Supra hits the Dyno!

When we last left our 1997 Anniversary Edition Supra, it was just getting used to calling to it’s new owner and had been modded for the first time in its life.

Because the car is so new, my friend is adamant about going slow and keeping it BPU for a while. He even goes so far as to utter the sentence I have heard about a zillion times from customers over the years.

“No, I’m more than happy with this power level, I don’t need to mod the car any further”

When people usually say this to me, I snort in derision and just sit back as the mod bug proceeds to take a huge bite of their wallet.

My friend has been a employee of Apexi for over 7 years, and even he cannot deny the temptress that is the 2JZ.

Within a few days of installing the old school Super AFC, he went out and purchased an upgraded turbo, manifold, Greddy 4 row intercooler, a full set of Greddy gauges, and 660cc RC injectors.

The turbo installed is a T4 62-1 with a 4 inch inlet .70 a/r compressor, with a stage V 1.01 A/R exhaust side.

For a rough idea of how much of an upgrade this small turbo is, take a look at this side by side comparison of a T4 62-1 and a CT26.

He’s elected to go with a SSAutochrome style Ebay log style manifold coupled with a 44mm Tial wastegate dumping back into a 3inch downpipe and full exhaust with a high flow cat.

With just a few mods and a turbo / manifold swap, we head down to our friends at DSR, check them out here : http://www.dynospotracing.com/

Using the DatScan datalogger, we tap into the Supra’s ECM to get a firm readout on the engine’s vitals. More importantly we determine the tip-in point for boost as we dial in the fuel trims accordingly.

We are aiming for a 12.5 AFR at the transition and a rock solid 11:1 at WOT until redline. The Supra is running 22 psi of boost through a full catback and 3inch Vibrant High Flow Catalytic Converter.

After just an hour, the car put down a SAE corrected power level of 521 with 433 ft lbs of torque.

The Supra put down a very healthy number with an excellent fuel curve, all for just a handful of mods. Next up for the car is a bigger turbo, more boost and Crower cams!

Congratulations Eric!

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.