If you are keeping the 4G93T engine, 4G93T ecu and 4G93T engine harness, it should work as there will be no reason for it not to. But if going to a 4G63 engine and ecu later, whilst still keeping the 4G93T engine loom, you will need to extend and relocate alternator wires to suit the 4G63 engine position, plus good possibility the thermo fans wont work. It was hit and miss with the thermos during some of the conversions I did. Also the pinout for the radiator water temp sensor [bottom of radiator] might not align up in the right spot with the evo ecu as the evo grabbed water temp from near the thermostat.
If you get your hands on an evo interior loom it'll plug straight into the GSR harness behind the glove box.
BUT, you have to be mindful of the evo accessories that require sensors and wires and fusible links in the engine bay.
e.g.
EVO climate control doesn't need an outside temp sensor if you're not going to have aircon setup. The outside sensor runs via a wire and resistor along the passenger side of the engine bay and bolts to the radiator support frame (under the bonnet latch) at the front of the car.
EVO climate control needs all the additional electric motors that control the opening/closing of the vents.
EVO climate control also has a sensor in the aircon box under the dashboard, and also up under the dash near the demister/windscreen
EVO climate control will obviously need the climate control head unit and evo interior wiring loom to work.
EVO aircon switch in the climate control ... totally different setup. You will need to check the pinouts from the evo loom ecu and cross reference them with the gsr ecu.
EVO fold in mirrors use the controller to the right of the steering wheel. You will need the evo interior loom to get the correct plug and wiring/ relay/ power feed to operate them.
EVO interior loom has a 5-wire plug that connects to EVO 5-wire door loom for the fold in mirrors. As mentioned, GSR only has 3 wires. You can make an extra little harness for the extra 2 wires, but you will need to cut off the evo fold away mirrors plug and use your own 5-wire plug or connectors.
EVO has an intercooler sprayer switch in the centre console. It goes to a second motor In the wiper/windscreen washer bottle reservoir which then pumps water to the sprayers in the front of evo front bars. you will need to get a twin pump reservoir and also make up your own wiring to the reservoir then out to the front of the car.
EVO III has a special 2-switch button above the right hand drivers vent for front and rear fog lights. It uses a special Y-connector in the EVO III only dashboard which plugs into the switch to make both buttons work. As a result, you will need to do some wiring behind the switch for front foglights and again in the rear harness for the tail light foglights.
EVO also uses a buzzer and light surround around the ignition barrel. Make sure if you get an evo loom that you also get the timer / beeper box (which bolts up on the vertical support behind the stereo, and also the plastic circular light that fits around the ignition barrel.
EVO has a slightly different location for the handbrake light in the gauges cluster than the GSR does from memory so you may need to swap out the side sections of the EVO cluster for GSR items (if you are going to use an EVO cluster).
umm... probably more but at this point in time not coming to me.
Even if you do all the above you might find yourself spending countless amount of hours doing it and probably chasing up gremlins, checking pin outs and testing wires for power and signal.
It really does save a hell of a lot of hassle and time if you could actually locate all the bits you need first for an easy conversion before getting stuck into it.
Edited by EVO-00X, 05 August 2013 - 02:43 PM.
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