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Old 01-29-2009, 09:41 AM   #1
Imakuni
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Default Turboing a EJ20?

I've searched and found a lot of interesting information, but mostly about the U.S 2.5L RS.

I'm from the U.K and might be in the position to have a Impreza 2.0L GX Sport AWD (Either Bugeye or Blobeye) as my first car.

Obviously i'd get used to driving the stock car first and increase my driving skill, but seeing as i'd likely keep the car for 4-6 years i'm wondering whether it would be good to turbo it to increase performance instead of selling the car and buying a quicker one.

Would it be the same story as turboing the 2.5? Or is the 2.0 a better base to begin work on?

I appreciate you guys in the U.S don't get the 2.0L non-turbo Impreza, but I thought i'd ask due to the large knowledge base here

TIA!
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Old 01-29-2009, 11:09 AM   #2
Matt Monson
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'73 914 and 2012 BRZ

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If you are handy and have a garage space it would probably be more cost effective to buy an Ej205 turbo longblock and wiring harness and ECU from another bugeye and do a true WRX swap. At least here in the states, the parts would cost about the same. But since your car is already a bugeye/blobeye, you will be able to just remove your wiring harness and replace it with the WRX one with no cutting or splicing. Here in the states, with the GC chassis cars we can't do that. We didn't get a WRX option until the GD chassis and more and more guys who own bugeye 2.5RS's are just doing swaps.
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Old 01-29-2009, 11:09 AM   #3
Matt Monson
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ps. What's the compression ratio on the NA Ej20 they are currently making for your market.
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Old 01-29-2009, 11:24 AM   #4
Imakuni
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Quote:
Originally Posted by Matt Monson View Post
ps. What's the compression ratio on the NA Ej20 they are currently making for your market.
Thanks for the helpful reply, CR I believe is 10.00:1 for the Bugeye and Blobeye, not sure about the Hawkeye or GR.

Just to be a pain, say if I didn't want to do a swap. Would it be as much of a hassle as turboing the 2.5?
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Old 01-29-2009, 11:57 AM   #5
Matt Monson
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It depends on which approach you take with it (trying to use factory parts or using aftermarket stuff), but the obstacles will be the same. I suspect your heads are really similar to Ej205 heads and likely have allowances for coolant and oil for the turbo that just need tapping, much like out DOHC Ej25d NA heads do. But in short, you'd basically do the same thing we do when we turbo an NA car.
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Old 01-29-2009, 01:03 PM   #6
Imakuni
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Quote:
Originally Posted by Matt Monson View Post
It depends on which approach you take with it (trying to use factory parts or using aftermarket stuff), but the obstacles will be the same. I suspect your heads are really similar to Ej205 heads and likely have allowances for coolant and oil for the turbo that just need tapping, much like out DOHC Ej25d NA heads do. But in short, you'd basically do the same thing we do when we turbo an NA car.
My ethos is similar to Litchfield Imports, trying to keep everything as factory-looking as possible really.

Ideally i'd get a full STi swap with all the bells and whistles, if not that i'd get a full WRX swap, my last approach would be turboing the stock EJ20 N/A.

In the U.K it wll be cheaper for me to literally build my own STi/WRX than to buy one (especially when you factor in insurance), so to speak.

Why-oh-why can't WRX/STi parts be a straight swap between blocks?

EDIT:

I'd be looking/hoping to use mostly Subaru factory parts rather than aftermarket if I decided to turbo the EJ20 N/A.
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