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Old 02-04-2005, 01:14 PM   #1
Elwood
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96 Impreza L 2.2t
05 LGT Unlimited Wagon

Question Old vs new NA 2.2 engines

Hi all

The short version of my question is: what are the differences between the early (90-94) and the later (95-up) 2.2 NA motors? Are the internals of either a better choice for handling moderate boost? Are the long blocks interchangeable (could I put a 94 engine in a 96 car, and vice versa, without any major issues)?


The longer version (for those killing time at work)Ö I have a 96 impreza L(2.2 L) that runs great. I want to turbo the car sometime in the near future. Also, I just acquired a 94 legacy wagon (2.2L) with a bad rod bearing. The goal is to turbo the impreza and fix the leggy wagon and keep it NA as a daily driver. If there are no major compatibility issues between the longblocks, Iíll pull the running 2.2 out of the impreza and stick it right in the wagon. Then Iíll build the broken 2.2 from the wagon, or get another motor all together to put in the impreza with a turbo kit. But, if swapping the motors between the 94 and 96 is a bad idea, Iíll have to come up with another plan..

Iím no noob, this just isnít an easy topic to search forÖ

Thanks for your help, and sorry for the long post,

Jim
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Old 02-04-2005, 03:19 PM   #2
subachad
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Hi Jim, if you are keeping the Leggy stock and boosting the L this is what I would do.

Put the good 2.2L block in the Legacy, it will bolt up fine. Get your gaskets from www.1stsubaruparts.com. Keep it stock and put some cash into the L.

With the L decide first if a WRX swap will be better. It probably will be. If you decide to keep the L with a non WRX engine, get some 2.2L turbo pistons and rings and install them into the otherwise stock block. This should allow you to run about 14psi which will probably get you around 280hp or so. 10psi will be safe for many thousands of miles and will probably give you most of the performance you are looking for. You can also get an upgraded clutch disk, but keep the clutch otherwise stock so as not to blow the tranny.

Figure out your AFI setup including engine management. I use E-Manage as do a few other board members and we have great luck with it.

At this point you will want upgraded brakes. I have some 98 RS brakes and they seem to work pretty good. The upgrade set me back only $60. You will also want a good suspension. Springs, struts, sway bars and polyurethane bushings.

It's possible to spend big money on this or you can keep it a little simple. Either way, it makes a good car a great car and you'll have fun educating "sports" cars.

Chad
www.uniquemotorsports.com
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Old 02-04-2005, 03:59 PM   #3
Elwood
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hey, thanks for the input.

I'm on the path already with the L... I put WRX brakes on all 4 corners, installed a wrx RSB, and RS FSB and suspension. It already outhandles my wrx, but I miss the turbo powa!

I've got almost everything for a WRX turbo kit, including x-member, manifolds, turbo-back exhaust, TMIC... really just missing fuel system and management, and the Emanage is one of the options I'm leaning toward... Of course I'd dump it all for a good deal on an EJ20T swap, but I haven't seen any steals lately.

So can you recommend a good source for 22T pistons?

Thanks again,
Jim
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Old 02-04-2005, 04:54 PM   #4
Matt Monson
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Head over to the NA forum and read a thread called "high compression Frankenstein". It should be on the first few pages of the board. We cover all the differences pretty in detail, and also may give you some ideas on where to go with your engines...

ps. I've got a good deal on a set of EJ20G heads that flow way better than the EJ22 heads, and that will drop the CR of an na EJ22 to the low to mid 8's. Good option if you want to boost an NA block...
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Old 02-05-2005, 11:17 AM   #5
subachad
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Matt to run those heads, won't he also need a RS intake manifold?

For pistons, check 1stsubaruparts.com. Jake (unsung boxer) works there and he has 2.2T pistons in his Impreza L with 370cc injectors and an E-Manage. He is using a custom set of pipes with a TD04L turbo.

The FSB, would that be a strut brace or sway bar? I thought all 93-01 imprezas had the same size front sway bar?

Chad
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Old 02-05-2005, 07:01 PM   #6
Elwood
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Quote:
Originally Posted by subachad
Matt to run those heads, won't he also need a RS intake manifold?

For pistons, check 1stsubaruparts.com. Jake (unsung boxer) works there and he has 2.2T pistons in his Impreza L with 370cc injectors and an E-Manage. He is using a custom set of pipes with a TD04L turbo.

The FSB, would that be a strut brace or sway bar? I thought all 93-01 imprezas had the same size front sway bar?

Chad
yeah RS front sway bar... I measured and I'm pretty sure it was bigger (only 1 mm or so) than the one that came on the L. not sure how much it helped, but it was free.

Got to lookin under the 94 leggy today. The first snag with the easy swap of the 96 motor into it is that the 94 has dual exhaust port heads. The 96 motor has single ports, and the rest of the exhasut appears to be completely different (and not interchangeable) between the cars too. Not sure how to overcome that unless I can source a cheap takeoff legacy exhaust from someone with the newer single port heads...

I really hate the thought of swapping the heads between the two motors because A, the 96 motor runs perfect and I'd hate to mess with a good thing, and B, I'd rather keep the dual port heads available for the impreza since there's a decent chance I'll be bolting a wrx manifold to it.

Any thoughts?

Anything else I should look for when contemplating putting the 96 motor into the 94?

And since you mentioned Emanage, how does it work with boosted MAF cars? Are you clamping the MAF and tuning with the Emanage pressure sensor?

thanks again
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Old 02-06-2005, 08:48 PM   #7
Elwood
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05 LGT Unlimited Wagon

Default update

well, the bad motor is out of the leggy, and I'm formulating a plan.

I think I just scored a set of SOHC EJ25 heads for a reasonable price. I can dedicate those to the turbo motor. And now it doesn't seem like such a big deal to swap the heads from the dead 94 motor onto the 96 motor, which would eliminate the exhaust problem.

When I get to the turbo build up... Can anyone tell me what kind of compression ratio I'd get with the 2.5 heads on an NA 2.2 short block? Is it still worth using 22T pistons? what kind of diference can I make with head gaskets?

Edit - Added:

If anyone is following along or asking the same questions,
I just stumbled onto a nice bit of info:
http://wac.addr.com/auto/obs/turbo/ejcalcs.html

It still doesn't ell me eaxactly where I'll be with 99 2.5 SOHC heads on a NA 2.2, but does seem to indicate I'll lose a 1 to 2 on CR. Subtract that from 9.7:1 stock = proabaly somewhere in the 8 to 9:1 range. That sounds pretty reasonable for a low buck, moderate boost setup like I'm shooting for.

Can anyone confirm that?

Jim

Last edited by Elwood; 02-06-2005 at 09:19 PM. Reason: added some things
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