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Old 04-19-2009, 09:33 PM   #1
subasurf
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Default Installing Turbo Kit on a N/A EJ20

Hey fellas. Very n00bie question here.
What are the implications involved in installing a turbo kit on a normally aspirated EJ20 in a 2001 Forester? I'm assuming if you were to do this without replacing the engine internals then you'd have to be very carefull about what level of boost you run at, but what other things need to be considered?

I understand it would be far more practicle to just dump a new engine in the vehicle but I'd still like to know

EDIT: This got moved from the n00b section so sorry for the extreme n00biness.
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Last edited by subasurf; 04-19-2009 at 09:41 PM.
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Old 04-20-2009, 05:30 PM   #2
Matt Monson
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Your initial assumptions are sound. What's the compression ratio on that engine? Is it DOHC or SOHC? Single or dual port exhaust ports? We don't get that particular engine here and I am trying to figure out exactly what you have?

That said, you'll want to run low boost, even if you run a td04 takeoff turbo from a WRX model. If you want to use stock WRX exhaust plumbing you will need a turbo crossmember as well. Depending on the heads, it may be really easy to use a bunch of stock stuff. Can you provide pictures of your engine bay? I'd be happy to help you think this through if I had a better idea of what you've got there.
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Old 04-20-2009, 09:01 PM   #3
subasurf
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Cheers mate I'll try and get some pics up tonight.
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Old 04-20-2009, 09:50 PM   #4
Matt Monson
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Good morning. It's 8pm here. I'll look for them in my morning...
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Old 04-21-2009, 05:51 AM   #5
subasurf
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Engine is SOHC and the compression ratio is 10.0:1
The air intake silencer bulky piece of crap is missing from the photo as I pulled it out the other day while I was servicing the engine. It'll be going back in...maybe

The engine bay is filthy as **** because it spends almost all of it's time off road at the moment.


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Old 04-21-2009, 09:34 AM   #6
Matt Monson
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Ok,
That gives me a lot to work with. The one question I still have is whether your exhaust ports are single port or dual port. If they are dual port you can use WRX headers and uppipe if you are willing to replace your engine crossmember with a WRX one.

If they are single port you will need to get a custom uppipe and downpipe made. It would run from the joining of the "Y" up to the turbo and then a DP back down.

Because of the design of those heads (which I suspect are identical to our USDM Ej22 heads) you will need to tap into the heater core coolant feed and returns for coolant for the turbo.

You can get oil for the turbo off the top of the block by putting in an adapter under the oil pressure sender up behind the power steering pump. You will probably want to weld a return bung on to your oil pan.

That's kind of it in a nutshell. It's not really super easy to do, but is reasonable. Just search around for people here on NASIOC doing something similar with a late Ej22. By late I mean '99 or newer.
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Old 04-21-2009, 10:09 AM   #7
subasurf
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Sweet as bro. You've been a champ
As for the exhaust ports, well, I don't know if they are single or double on my block, to be honest I'll have a look into it.
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Old 04-21-2009, 12:42 PM   #8
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interesing thread. Being as its a 2 liter, you could prolly pick up wrx internals for cheap if they arent the same. I wanted to try this on my 2.2, but decided to go with version 4 sti heads, 22t pistons, 22t crank, and sti rods. Im not sure that it matters, but how much boost do you plan on running on that high comp 2.0? The only reason why Im asking is doe to the fact that most turbo motors are 8-8.5 roughly for compression. Id like to see a high comp down with boost, I got no helpful answers as to how reliable it would be. Maybe Matt can chime in as Ive read many posts and threads by him.
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Old 04-21-2009, 06:48 PM   #9
Matt Monson
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High compression motors with any sort of real boost are the realm of racecars and high end tuner cars. Doing it right requires spot on tuning and cams that are designed for forced induction, as well as bulletproof internals.

Low boost engines don't have to be timebombs though. You've got to give them enough fuel and not let the red mist blind you into turning it up to high. At 10:1 I personally wouldn't go much past .5bar on something small like a tdo4. It will be good for 50 or 60whp and make the car more fun. However it will also accelerate wear on the engine. That's just the nature of the beast. I call this sort of build "dark-ages boosting". We've come a long way since the late 90's and early 2000's when people started fabbing up turbo "kits" for the 2.5RS and LGT. But that doesn't mean you can't do it anymore. Just be careful and conservative. And have some money in the bank. The boost bug tends to bite hard and if you don't need to spend money because you blew it up, you are just as likely to need money to buy an Ej205 shortblock to mate to those heads to drop the compression and up the boost. Just look at Reddevil's threads. It could be never ending...
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Old 04-21-2009, 10:34 PM   #10
subasurf
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Quote:
Originally Posted by Matt Monson View Post
Low boost engines don't have to be timebombs though. You've got to give them enough fuel and not let the red mist blind you into turning it up to high. At 10:1 I personally wouldn't go much past .5bar on something small like a tdo4. It will be good for 50 or 60whp and make the car more fun. However it will also accelerate wear on the engine. That's just the nature of the beast. I call this sort of build "dark-ages boosting". We've come a long way since the late 90's and early 2000's when people started fabbing up turbo "kits" for the 2.5RS and LGT. But that doesn't mean you can't do it anymore. Just be careful and conservative. And have some money in the bank. The boost bug tends to bite hard and if you don't need to spend money because you blew it up, you are just as likely to need money to buy an Ej205 shortblock to mate to those heads to drop the compression and up the boost. Just look at Reddevil's threads. It could be never ending...
This is exactly what I wanted to hear
I'm really not looking to have a high performance vehicle at the end of all this. I don't even speed. I'm just looking at having something a bit more fun to drive and having a project that will teach me a lot. Having said that, understandably it can be an expensive lesson , so I will probably be waiting until I get my Land Rover as a backup car in case I blow my daily driver

Looks like I've got a lot of reading to do in the mean time. Any must read recommendations?
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