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Old 06-26-2012, 10:10 AM   #1
GGSimpreza
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Default Late EJ20G throttle body pics needed

Hey guys I need pics of a late EJ20G throttle body. The motor I just bought has an EJ20G engine code on the timing cover, but doesn't look like it. I need to know how to wire this thing for my swap, and the throttle body looks like a K to me. Help?

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Old 06-26-2012, 10:20 AM   #2
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"Late" EG20Gs are wired like Ks.

The coil on the manifold marks yours as a "Late" (3-plug ECU). Early ones had the COPs.

If you need the early throttlebody (4 plug ECU) then there have been a few folks to flip an early TB and add a small spacer to mount it on the late (K-style) intake manifold.
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Old 06-26-2012, 10:22 AM   #3
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I got this from Tiger JDM with an Z5 ecu, which is a 4 pin G ecu. I should get them to ship me a different ecu then?
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Old 06-26-2012, 10:35 AM   #4
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I'd rather have the 280 HP EJ20k ecu (the 6S I think?) if I can.
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Old 06-26-2012, 11:59 AM   #5
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I, personally, like the early stuff because Rob has an off the shelf, tested, and trusted tune for them.

IIRC, the 280HP ECUs have a hard time with our gas.

Do you have a harness also? If so, is it for a 3 or 4 plug ECU? You might need a 4 plug/COP motor instead?
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Old 06-26-2012, 01:57 PM   #6
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I have a Z5 ECU but I'm gonna get them to send me a 6S or 75 cause the k wiring can't run off of a Z5, correct?

Also, I have access to 93 octane all over, not sure if that makes a diference.
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Old 06-26-2012, 04:02 PM   #7
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You need a 3-plug ECU to run that engine. If it has a TD04 turbo, grey top injectors and a purple label MAF you need either a 2S (WRX Wagon M/T) or 4W (Forester Turbo M/T). If it has a VF-series turbo, yellow top injectors and an orange label MAF you need either a 1S (WRX) or 6S (WRX STI) ECU. The STI ECU runs a bit more midrange boost but power levels are the same (280 PS @ 6500 rpm).
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Old 06-26-2012, 04:03 PM   #8
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I now see the engine has a flex plate so it's definately got a TD04 and grey top injectors (at least that is how it left the factory).
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Old 06-26-2012, 04:11 PM   #9
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Quote:
Originally Posted by Marnix View Post
You need a 3-plug ECU to run that engine. If it has a TD04 turbo, grey top injectors and a purple label MAF you need either a 2S (WRX Wagon M/T) or 4W (Forester Turbo M/T). If it has a VF-series turbo, yellow top injectors and an orange label MAF you need either a 1S (WRX) or 6S (WRX STI) ECU. The STI ECU runs a bit more midrange boost but power levels are the same (280 PS @ 6500 rpm).
I was under the impression that I could run any 3 plug ecu. I understand the 6S would run best with yellow top injectors, but I thought it can run on any car with a 3 plug ecu. Am I correct?
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Old 06-27-2012, 04:03 AM   #10
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No, the EJ20K ECUs run bigger injectors and a bigger MAF. When mixing these up driveabilty will be quite poor indeed.
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Old 06-27-2012, 09:42 AM   #11
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I can find these injectors a lot of places, but where would I find this MAF?

I'm sure the 6S is a more aggressive tune, can I plug it up just so I can drive the car, and pick up the injectors and MAF in the meantime?
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Old 06-27-2012, 12:57 PM   #12
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In general you need to match the ECU to the injector size and MAF version it expects. Otherwise you are asking for trouble.

Besides that, your motor has a CR of 9:1. If you try to run an ECU meant for high octane AND 8:1 engine, it certainly will not last long.

-Rob
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Old 06-27-2012, 06:25 PM   #13
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Thanks Rob, I'm getting a 2S for it. Problem solved!
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Old 06-28-2012, 02:35 AM   #14
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So what's the power output of the forester 20G?
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Old 06-28-2012, 09:51 AM   #15
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Quote:
Originally Posted by i_c_the_light View Post
So what's the power output of the forester 20G?
Depends on what version you're talking about. Look up what ECU matches the motor you're asking about, and then Google Rob's EJ20G ECU list. It includes power and boost levels and stuff.
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Old 06-28-2012, 05:47 PM   #16
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Quote:
Originally Posted by GGSimpreza

Depends on what version you're talking about. Look up what ECU matches the motor you're asking about, and then Google Rob's EJ20G ECU list. It includes power and boost levels and stuff.
I'm on my phone, it'll make me rage if I attempt that. Let's say 4W ECU.
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Old 06-28-2012, 08:24 PM   #17
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Old 06-29-2012, 06:32 AM   #18
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Late EJ20G in Forester and Impreza WRX Wagon made 250 PS. Both are high compression engines (9.0:1).

I have a 4W ECU available should you be interested.
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Old 06-29-2012, 07:31 PM   #19
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Quote:
Originally Posted by Marnix
Late EJ20G in Forester and Impreza WRX Wagon made 250 PS. Both are high compression engines (9.0:1).

I have a 4W ECU available should you be interested.
Awesome thanks.

I live in New Zealand so most of the JDM stuff is accessible to me.
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