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Old 07-29-2006, 08:49 PM   #1
DeusExMachina
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Default AEM EMS: '00 RS, v3 STi

Hey all. My car is a 2000 RS coupe. I purchased a JDM STi v3 (1997) front clip.

I'm keeping my car LHD, and dreading the wiring. So, at the suggestion of my tuner, I'm going to run a standalone.

We like the EMS, having had some very fast cars that run great on the AEM, so I decided for a number of reasons why to use a standalone:

- Simplified wiring. As far as I can figure, the only wiring I'll need to do is to make a new wiring harness that controls the engine. Everything else will remain stock, with the stock ECU disconnected. I will need to tap things like starter, power, ignition, RPM, VSS, etc. What other things will I need from the stock harness? Since my car will be LHD, I would have had to extend the harness to reach the opposite side of the car in many places. This would have ended in headache and a mess.

- Maximize power. The AEM will be completely tuned to the set up and intended for 93 octane. 93 is very readily availiable, and even 100 octane, so the car will be tuned for that. Not 100 RON like in Japan. Since it will have a few goodies at time of start up, wiring in the JDM ECU is probably a big waste of time.

- Cost. Yes, the AEM EMS is expensive, but I can recoup a lot of that by selling the wiring, ECU and RHD set up of the car. I'll probably get out of this spending a few hundred overall.


Current project plan:
1. Use a Honda AEM box. The Civic box is intended for a 4cyl car, and besides that is the exact same as most AEM boxes. All sensor calibrations are blank when you receive the box, so things like crank angle, cam angle, oil pressure, etc, will be given the Subaru parameters.
- Because its the Honda box, its cheap, and a plug-in wiring harness is easily and cheaply availiable.
2. Intake Air Temp, MAP sensor, what other sensors do I need from AEM?
3. AEM UEGO, Serial gauge and an EGT gauge.

Besides the questions posed above, I had a few others:

Should I convert to coil-on-plug? Is it an option to swap valve covers, and use the WRX's coil/plugs?
Can everything function normally with the ECU disconnected, and a few key things referenced from the stock harness?

Thanks for advice, comments, and information.
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Old 07-31-2006, 12:58 PM   #2
Jaxx
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honestly after thinking the same thing and two years of trying to make it a smooth its a pretty (really) bad idea

you will be doing as much wiring with the aem(probbaly more) as with the stock ecu and you will actually be able to drive the car when your done

figuring out the sensor paramiters/fireing order/cam and crank is not a trivial task

you might be able to sell the ecu but your not going to be getting much for the 2000 RS wireing (you will need the engine harness from the v.3)

.. FWIW the crank and cam signals from the v3 are differnt than the usdm WRX
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Old 07-31-2006, 01:14 PM   #3
DeusExMachina
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Just looked it up..there's an Autronic plug and play box for the '97 STis.

So I might wire it in..for stand-alone..anyway.

I can just run the STi harness straight from the ECU connectors to the engine, and tap the few additional things I need. Still trying to compile a list..what do I need from the stock harness?
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Old 08-01-2006, 10:45 AM   #4
Jaxx
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Quote:
I can just run the STi harness straight from the ECU connectors to the engine, and tap the few additional things I need.
right thats the method
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Old 08-01-2006, 07:04 PM   #5
DeusExMachina
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Honestly, I don't know what is involved with wiring a swap. Got any links to guides, Jaxx? I can assume a couple things but I hear about people taking apart the entire interior I just don't understand.
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Old 08-15-2006, 10:04 PM   #6
johnkaldar
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I just got done with most of my v4, same as the v3, and there was about 16 wires that I pulled from the rs harness. Most were ecu +, grounds, etc. all other wires came from the engine sensors and if you have the harness already then you don't have to run any wires. Autronics sells a plug and play unit. I took out the vent box against the inside firewall and did all my splices there. No need to tear out the whole dash this way. I am running a gauge for my water temp instead of the gauge on the cluster so none of this should be a problem.
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Old 08-20-2006, 10:29 AM   #7
DeusExMachina
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Which vent box?
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Old 08-20-2006, 10:29 AM   #8
DeusExMachina
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Oh, and I've also decided on using the Autronic box.
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Old 08-23-2006, 11:11 PM   #9
johnkaldar
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the vent box for your a/c heater unit.
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