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Old 07-24-2006, 06:30 AM   #1
Crashsector
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Join Date: Oct 2005
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Default An EJ22T, USDM WRX intake, and my 2005 RS... a technical discussion

Let me start by saying I've spent the past two days reading up on the EJ22T swap subject. I've come across a lot of great information, and that is much to NASIOC's credit. There are still a few holes I wouldn't mind some help with.

I'm planning on making my car bulletproof - this will be an exercise in engineering and precision, not all out power mongering. I was shuffling my swap options around in my head and the idea of a hybrid EJ22T came up.

Seeing as EJ22T's can be had for quite a song, and the cost of cleaning and rebuilding them with forged internals still comes to about as much as it would cost for a JDM WRX longblock (my next choice), it starts to make a lot of sense. Especially for my bullet-proof concept.

So here's my question. If I use an EJ22T block, with USDM 2.0L WRX heads, and most likely the entire WRX intake manifold, what am I going to have to do ECU wise? Will it run with the WRX ECU (properly swapped into the car)?

Logic tells me that wiring-wise I can just treat it as a WRX swap, but I'll need some kind of tuning to take advantage of the extra displacement. Is this true?

I need to stay emissions-legal as this car will be used in Rally Cross and eventually ClubRally.

Thanks for any input, and let the fun begin!

--Andy
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Old 07-25-2006, 05:28 AM   #2
Crashsector
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Default

So I guess the ultimate question is this:

Is there any way to use an EJ22T and make it OBD-II compatible?
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Old 07-25-2006, 09:40 AM   #3
kheff46
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if your heads/intake are from a WRX. then a WRX ECU is the logical choice for a more direct PNP swap. an ECU from a WRX is probably able to compensate for the extra displacement from the 2.2. it would be similar if you just plugged a 2.2 block into a completely stock WRX car. it thinks(ECU) its a stock 2.0 still. still OBD-II compatible. there may even be a chance to get your 2.5 ECU to run things with some additional wiring. but go WRX ECU for ease of install.

you could use your RS heads(which flow more iirc) and not get another ECU. save $$, and just figure out the other small stuff needed. this would be my option really. but the 2.2 heads may allow for more RPM's and headroom for boost. i've heard of old 2.2's spinngin like 10K+ and little to no wear on the bottom end! probably valve spring bind hindering more rev at that point than the engine being incapable. but theres lots of options before you. pick quality, then ease of swapping, then $$ factor if you want the best. pick $$ factor, then ease, then quality if you just want to run. but remember to have fun or else it's not worth it.

--keith
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Old 07-25-2006, 04:40 PM   #4
Crashsector
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Thanks for the reply.

Quote:
Originally Posted by kheff46
if your heads/intake are from a WRX. then a WRX ECU is the logical choice for a more direct PNP swap. an ECU from a WRX is probably able to compensate for the extra displacement from the 2.2.
Is there anyone that could corroborate this? Thinking logically it makes sense; nothing different than if someone with an STI gets an overbore and changes displacement slightly. The stock ECU still runs the car but it is tuned with an Access Port or UTEC for the added power.

Quote:
Originally Posted by kheff46
you could use your RS heads(which flow more iirc) and not get another ECU
I'm worried about the fact that my ECU has no maps dealing with boost, and it probably won't deal with it very well. Yes, it will run, but it doesn't go along with my bullet-proof concept.

Anyone ever done this or seen something like this done before? I'm just looking for some evidence that it can work before I start throwing down cash.

Thanks!
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