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Old 07-08-2008, 12:30 PM   #1
civic this
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Default Can somebody please sum this up.

I have been all over this forum, and read many different opinions about the same topic. I have a 99 impreza with a 2.2L N/A. I want to swap a 2.5L RS engine in. Is there many mods, sounds like a direct bolt it. If so, what do I need? Also I read I can install my 2.2L heads on the 2.5 block for a 11:2:1 comp ratio.

Can somebody please confirm this, would be greatly appreciated.

Thanks,
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Old 07-08-2008, 04:43 PM   #2
PSolbergfan
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I believe mechanically it is a direct bolt in. I think the 2.2 litre engine has a cable clutch and the 2.5 RS comes with a hydraulic clutch. You might need to upgrade the clutch to handle the increased torque. It also depends what RS engine you want to put in. Phase 1, phase 2, DOHC or SOHC? The older RS models have a MAF sensor that is prone to failure due to vibration. The newer models have a MAP sensor. I've had no problems with my 01 RS engine. NONE! This is a "phase 2" block. You have to watch the head gaskets in the 2.5 litre motors though. Those go out.

As far as swapping the heads from a 2.2 onto 2.5, it can be done. I believe you'll be raising the compression ratio so you'll need to use a thicker head gasket. You might need a stand alone or ECU re-tune. Hope this helps. Check out rs25.com. If you have any other questions send me a private message.
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Old 07-08-2008, 07:28 PM   #3
Storm
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In a nutshell, your 99 EJ22 heads on a phase II EJ25 block, will yeild a compression ratio just over 11.2:1. Also, in using your current heads, you can keep the current intake/exhaust manifolds, wiring harness, ECU, etc....for a bolt in experience. I would suggest a better flowing exhaust manifold, but the Borla is the only aftermarket piece offered. They quit making them too (probably because they were prone to holding together, but mostly just cracked or broke). Custom EL headers are not too hard to make, as proven by the few home built jobbies shown in various threads.

Going this route, you should be able to pop a 99 2.5RS ECU into your car with no other changes to get more from the new setup. NASIOC member "Whitney" has a thread outlining this very type of buildup, except he added reground cams from Delta, for his OBS. He logged a drop of 2+ sec in 0-60 times, as well as a ton more fun while rallycrossing the car. He made his own header as well..... Look here for more info: http://forums.nasioc.com/forums/show...rallycross+car

Jay Storm

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Originally Posted by civic this View Post
I have been all over this forum, and read many different opinions about the same topic. I have a 99 impreza with a 2.2L N/A. I want to swap a 2.5L RS engine in. Is there many mods, sounds like a direct bolt it. If so, what do I need? Also I read I can install my 2.2L heads on the 2.5 block for a 11:2:1 comp ratio.

Can somebody please confirm this, would be greatly appreciated.

Thanks,
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Old 07-08-2008, 07:33 PM   #4
Storm
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I'll add that the hybrid build will result in more fun than a straight EJ25 swap. You don't have to do anything with your clutch actuation (hydraulic/cable) just install an OEM or upgraded clutch for an EJ25. All will be well with the world. Your wiring will be minimal should you go for a straight swap, since the intake manifolds will interchange with your year (if you go with a SOHC EJ25). It'll literally be plug and play. An EJ25 exhaust header will be required since your OBS has single exhaust ports per head.

Jay
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Old 07-09-2008, 03:55 AM   #5
civic this
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Thanks alot guys, this makes alot more sense. It's hard to find good answers sometimes, and you've both nailed it well. Now that I know the facts, I will be on the lookout for a 2.5RS DOHC. I'm building a rally/autocross car by the way. It is stripped and will be getting a cage by the spring.

I'll send you a private message if I need anyhting Psolbergfan, Storm, good info, you have me convinced to do this specfic swap.

Thank alot guys!
Marco,
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Old 07-09-2008, 12:08 PM   #6
civic this
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Hey Storm, thanks for that link, I spend at least an hour reading all of it. Nice car by the way, really pulls hard out of the corners. Good job. You really know you stuff, as I dig deeper into my project, I'll keep you up to date. Thanks for everything.

Marco,
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Old 07-09-2008, 06:22 PM   #7
Storm
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I can only take credit for the block in that OBS. I sold it to him! My Brighton started with the EJ18, went to a phase I EJ25D with 96 heads (hla's), then a phase II/DOHC hybrid, and currently a phase I EJ22. My phase II EJ22 is just about ready to be reassembled for another 20-25hp with the LinkECU standalone ECU .....gotta love it!!!!

Jay
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Old 07-10-2008, 04:19 AM   #8
civic this
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Nice, ya, those stand alone unleash all the power. You've done your fair share of swaps. I have rod know in my ej22, so that's why I'm swaping for a 2.5 rs. Pretty sure my ej22 is a sohc, which means I would have to get just a phase 1 2.5 rs cause it's also a sohc, correct? (sorry for all the questions, I can tell you almost anything about a honda). Is there an ej251 (sohc) and phase ll ej25d (sohc). The specs are pretty much the same. Seems phase ii started in 99' I can't seem to find too much of an advantage for the dohc, hp and tq are close.

By the way, how far away are you from Sandusky Ohio? I went to Cedar Point just last week. 7 Hour drive for me.
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Old 07-10-2008, 07:58 AM   #9
Storm
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I'm about 1.5hrs from Cedar Point...depending on how fast I drive. On my way to Toledo this past weekend, I found out that my ZeroSports replica grill has a speed limit of somewhere close to 120mph (I was late-late-late).

For you, it would be easier to go with a phase II EJ25 (SOHC) since the wiring will go together much easier. It should be a complete plug and play starting with a 99. The differences between the DOHC and SOHC are slim, but the SOHC seems to put down more Tq. while the DOHC loves to breathe up top. I think that really it just comes down to which setup would be more convenient.....and SOHC would be more convenient for you. As an added benefit, Delta cams are cheaper when you only need to buy 2...

Jay
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Old 07-10-2008, 12:28 PM   #10
civic this
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Hey Jay,

120 mph, really cooking. I've done the same thing, it was fun at the time.

So the phase II it is. By looking at the engine, where can I identify if it is a phase II or I. The sohc is more for what I'm looking for, the torque. Would you happen to have any extra parts laying around you are insterested in selling? I'm looking for the engine, tranny, ecu and a rear disc brake conversion. Pretty sure I just need the control arms and hub assembly and should bolt right up if I'm not mistaken.

Thanks again Storm, your the man!
Marco,
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Old 07-10-2008, 01:27 PM   #11
Storm
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I have a phase II block and a fairly complete intake manifold left over from previous projects. The block was slated to be overbored and built up, but it probably won't happen now that the EJ22 seems to be a winning combination. Feel free to PM me if you're interested. I can supply some thinner Cometic headgaskets to bump the compression a little more, as well.

Jay
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Old 07-11-2008, 01:13 AM   #12
PhilSine
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You have a PM...

Something about headers.
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Old 07-11-2008, 11:32 AM   #13
civic this
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Storm,

That block is a 2.5 phase II right? I have an intake manifold from my ej22 with everything in tact. What exactly do you mean "slatted". Also, do you have the crank, rod and pistons? And about the head gasket, you guys have all the good stuff in the states, over here in Canada, it's really hard to find parts like that just anywhere. Usually I would have to buy all my parts from the states and get them shipped over. I guess you don't have a 2.5rs ecu? I've called the wreckers here, and finding parts is pretty tough. I am interested in the block. Does it have all accessories on it, water pump, oil pump and so on. If so, would be willing to go for a drive sometime to pick it up. Let me know Jay.

Marco,
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