So after so long running on the stock ECU I have finally decided to go with a standalone. This is partially based on my last few track runs where I was losing fuel at the top of the RPM band. I’m still not sure what was happening but I think I was either putting too much fuel pressure on the injectors and locking them or possibly that I was maxing out the MAF signal to the stock ECU resulting in fuel cut. Regardless, some changes are about to happen.
I have purchased an Adaptronic e420c along with an Innovative wideband and some 440cc 7mgte injectors. I also bought a flying lead harness with the ECU “header” connector attached as to make my own PnP harness.
Bought the ECU from here, US dealer - http://www.clublexus.com/forums/5383096-post208.html
The harness came from here - http://www.autosportwiring.com/Products.htm
The injectors and wideband came from eBay.
For anyone not familiar with my car here is a link to my modifications, not 100% updated but close - http://www.clublexus.com/forums/5383096-post208.html
Attached is a wiring diagram and a picture of my mostly completed harness. A few notes:
All of the grounds for the Adaptronic are using the factory ground points through the factory wiring despite what’s shown on the diagram.
The Suprastick (transmission controller) will be wired completely separate from the patch harness despite the diagram.
It turns out that the factory ABS wheel speed sensors CANNOT be used for vehicle speed inputs into the e420c as they are, they need a modified circuit to convert the signals from them into a digital signal. I will likely do this since it is cheap and reasonably easy to make this circuit and I would like to use the traction and launch control features of the ECU. I will use at least 1 rear wheel sensor for an MVSS input and at least 1 front wheel speed sensor for an SVSS input into the Adaptronic. If for some reason this doesn’t work out I will fall back onto the vehicle speed senor installed on the auto transmission which does send out a digital signal. This should allow me to at least use launch control.
The AC circuit. I’m not 100% sure how this works factory. This is how I think it works: Power comes from the heater fuse, travels through the AC relay to the ACMG terminal of the ECU, then out the AC terminal on the ECU to the AC control assembly. I am pretty sure that the AC control assembly controls the ground on the circuit and that it goes through the ECU only so that it knows when the AC is on for idle up. I think that on either the ACMG or AC terminals there would be 12volts with the AC off. Then when the AC is turned on and the AC control assembly closes the ground on the circuit there would be 0 volts on either of the terminals. I plan to try and verify this before hooking it up as shown in the diagram.
I have been using 315cc 7mge injectors with a Bell Engineering FMU. I think that the 315’s are too small which is why I got the FMU. With the 440’s I will be ditching the FMU and running stock fuel pressure.
I will be using the factory EGR wiring to connect the MAP sensor to the ECU. Also going to use the IDL2 wiring (normally for the sub-throttle position sensor) to connect to a solid state relay for my water meth injection. The SS relay will allow me to use PWM to control the water meth pump. Also using the MAF wiring to control a relay for my cooling fans. Will be using the stock control wire for the fuel pump ECU to connect a relay to turn the fuel pump on and off. Using the seat heater switches to enable / disable traction and launch control since I don’t have seat heaters anymore.
I have acquired a few base maps to use for fuel and timing. I do plan to use the Adaptronic’s learning features to aid in tuning.
Well enough for now, even though I know there is a ton more. Let me know what you all think.
And thanks to Cobber for all the help so far…
KC
I have purchased an Adaptronic e420c along with an Innovative wideband and some 440cc 7mgte injectors. I also bought a flying lead harness with the ECU “header” connector attached as to make my own PnP harness.
Bought the ECU from here, US dealer - http://www.clublexus.com/forums/5383096-post208.html
The harness came from here - http://www.autosportwiring.com/Products.htm
The injectors and wideband came from eBay.
For anyone not familiar with my car here is a link to my modifications, not 100% updated but close - http://www.clublexus.com/forums/5383096-post208.html
Attached is a wiring diagram and a picture of my mostly completed harness. A few notes:
All of the grounds for the Adaptronic are using the factory ground points through the factory wiring despite what’s shown on the diagram.
The Suprastick (transmission controller) will be wired completely separate from the patch harness despite the diagram.
It turns out that the factory ABS wheel speed sensors CANNOT be used for vehicle speed inputs into the e420c as they are, they need a modified circuit to convert the signals from them into a digital signal. I will likely do this since it is cheap and reasonably easy to make this circuit and I would like to use the traction and launch control features of the ECU. I will use at least 1 rear wheel sensor for an MVSS input and at least 1 front wheel speed sensor for an SVSS input into the Adaptronic. If for some reason this doesn’t work out I will fall back onto the vehicle speed senor installed on the auto transmission which does send out a digital signal. This should allow me to at least use launch control.
The AC circuit. I’m not 100% sure how this works factory. This is how I think it works: Power comes from the heater fuse, travels through the AC relay to the ACMG terminal of the ECU, then out the AC terminal on the ECU to the AC control assembly. I am pretty sure that the AC control assembly controls the ground on the circuit and that it goes through the ECU only so that it knows when the AC is on for idle up. I think that on either the ACMG or AC terminals there would be 12volts with the AC off. Then when the AC is turned on and the AC control assembly closes the ground on the circuit there would be 0 volts on either of the terminals. I plan to try and verify this before hooking it up as shown in the diagram.
I have been using 315cc 7mge injectors with a Bell Engineering FMU. I think that the 315’s are too small which is why I got the FMU. With the 440’s I will be ditching the FMU and running stock fuel pressure.
I will be using the factory EGR wiring to connect the MAP sensor to the ECU. Also going to use the IDL2 wiring (normally for the sub-throttle position sensor) to connect to a solid state relay for my water meth injection. The SS relay will allow me to use PWM to control the water meth pump. Also using the MAF wiring to control a relay for my cooling fans. Will be using the stock control wire for the fuel pump ECU to connect a relay to turn the fuel pump on and off. Using the seat heater switches to enable / disable traction and launch control since I don’t have seat heaters anymore.
I have acquired a few base maps to use for fuel and timing. I do plan to use the Adaptronic’s learning features to aid in tuning.
Well enough for now, even though I know there is a ton more. Let me know what you all think.
And thanks to Cobber for all the help so far…
KC