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Old 03-20-2002, 07:50 AM   #1
makeewak
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Question what to do with my 2.5rs

i own a 2.5rs and im thinking about either doing an engine swap for a ej20 or turbo/supercharging my current motor. what is the best route for me to taki?
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Old 03-20-2002, 10:33 AM   #2
Julian
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Buy a WRX.

What do you want? Outright power, low-down torque, ease of install, legallity...

How much money do you have to spend?
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Old 03-20-2002, 02:11 PM   #3
Darwin
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An EJ20 turbo swap is legal, and enough people have done it that it's well established. I guess the main factor is how much you can get an EJ20t with all the plumbing and harness for.
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Old 03-20-2002, 03:28 PM   #4
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A USDM EJ20T from a USDM WRX is a legal swap, provided you meet ULEV emissions when you're done (you have to meet emissions for the newer of the body/motor you install into your car). That does not clear the way for legal installations of non-USDM EJ20Ts, however.
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Old 03-20-2002, 06:47 PM   #5
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It's actually illegal to put an engine that is older than the body into a car. So the best option would be a USDM EJ20, as it will meet emissions and is newer that your car. Unfortunately, it has less power than a J-Spec WRX motor, and the J-Spec can probably be had for less money. Turbo/supercharging is probably going to give you the best of both worlds, as long as you do it right. You'll keep the low-end power of the 2.5L, and have the top-end power of the WRX.
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Old 03-20-2002, 07:57 PM   #6
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If you put in an EJ20t you will miss the torque and displacement of the EJ25, I guarantee it. I recommend a turbo kit like Shiv's, coupled with his TEC II kit, and run something like 6 or 7 pounds of boost. If you want more boost than that (you'll already be running as fast, if not faster than a WRX, with the low end torque) you'd have to think about the tranny and internals, but that's my advice.

You could also stay NA and get cams.
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Old 03-20-2002, 10:31 PM   #7
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I think a super/turbo would be a better choice. It should be a bit cheaper than a 02 WRX engine swap and it'll still have the 2.5 low end.

Mike
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Old 03-21-2002, 02:41 AM   #8
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USDM EJ20 with Tranny and rear Diff and everything inbetween IMO.

EJ25's dont like to be Turbo'ed, might find yourself spending even more to get another engine in the long run.
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Old 03-21-2002, 10:24 AM   #9
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You CAN transplant an older engine into a newer car (at least in Cali), you just have to meet the smog requirements of the newer of the two components.

But strangely enough, the cat isn't considered part of the engine, it is part of the chassis. So, my EFI engine swap in my Datsun 510 doesn't require a cat. Funny how that works.
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Old 03-21-2002, 12:10 PM   #10
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Turbocharge your current engine. There still is no replacement for displacement.
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Old 03-21-2002, 02:52 PM   #11
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Quote:
Originally posted by Julian
You CAN transplant an older engine into a newer car (at least in Cali), you just have to meet the smog requirements of the newer of the two components.
Are you sure about that? I've heard numerous times the same thing that HondaH8er said- That the engine must be newer than the body of the car. It also has to be USDM, IIRC.

Mike
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Old 03-22-2002, 08:00 AM   #12
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My initial thought (because I have been debating saving money and buying a RS over a WRX; budgeting reasons) would be Turbo the 2.5. But I have heard a few people mention (like above) that the 2.5 does not like the Turbo. WHY? I am looking for specifics. Will I have to replace Rods and Pistons?

Thanks

Jason
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Old 03-22-2002, 07:31 PM   #13
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Quote:
Originally posted by Julian
You CAN transplant an older engine into a newer car (at least in Cali), you just have to meet the smog requirements of the newer of the two components.

But strangely enough, the cat isn't considered part of the engine, it is part of the chassis. So, my EFI engine swap in my Datsun 510 doesn't require a cat. Funny how that works.
You might want to double check on that, especially there in California, considering what those emission laws are like. And I believe it's a federal law, and all the states have to follow it, about the engine not being allowed to be older than the chassis. The engine only has to pass the emmisions for the year of the body, though, so dropping an LT1 into a 57 Chevy, and pulling off all the emissions stuff should be OK, since the 57 doens't even have to pass emissions. Did I say the word emissions enough yet?
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Old 03-23-2002, 01:44 AM   #14
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Quote:
Originally posted by JMotorsprt
But I have heard a few people mention (like above) that the 2.5 does not like the Turbo. WHY?
Go do some searches in the aftermarket induction forum for "blown engine" and stuff about turboing a 2.5... Lots of people have blown their engines running too high of PSI. The 2.5 just isnt designed as well for acompaning a turbo... (Ive heard everything from the block doesnt have as strong of piston walls, to stuff about the block not being designed well in the first place)
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Old 03-23-2002, 02:21 AM   #15
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Yeah if the EJ25 is turbocharged w/too high of a boost, it's blown up Reason was what Kostamojen said, and also the cyclinder walls are too thin, as size is same as EJ20 and displacement is larger. Also, the open deck design is another reason preventing high boost setup. Tranny is another main concern, b/c the US Spec tranny just doesn't cut it for high boost turbo application. Being said all that, I am going to turbo mine soon (but at 5psi only, w/no further increase of boost).

Good luck modding!

-Benson (Another MY98 Owner)
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Old 03-23-2002, 06:52 AM   #16
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Thank you for the input. Guess I go back to the WRX vs. Spec V debate.

Thank you

Jason
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Old 03-24-2002, 04:38 AM   #17
makeewak
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Quote:
Originally posted by bensonwrx
Yeah if the EJ25 is turbocharged w/too high of a boost, it's blown up Reason was what Kostamojen said, and also the cyclinder walls are too thin, as size is same as EJ20 and displacement is larger. Also, the open deck design is another reason preventing high boost setup. Tranny is another main concern, b/c the US Spec tranny just doesn't cut it for high boost turbo application. Being said all that, I am going to turbo mine soon (but at 5psi only, w/no further increase of boost).

Good luck modding!

-Benson (Another MY98 Owner)
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Old 03-24-2002, 04:40 AM   #18
makeewak
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thats funny cause although all the warning about having the engine wall to thin, im still putting a s/c in my car.

hehe,
Rod
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