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Old 02-06-2005, 11:41 PM   #1
Jiggs
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Default 2.5 rs turbo

I have a 2000 Impreza 2.5RS, with an AT. It doesn't hae a turbo on it, but i want onw like none other. Is it possuble to put a turbo on this car? If so, where would a get a compatible turbo?
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Old 02-06-2005, 11:47 PM   #2
gpatmac
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Yes it is, but you would require a new exhaust system (exhaust manifold, downpipe, uppipe, etc...)

You could find someone with a WRX who has upgraded their turbo and buy theirs.

I'd recommend that you do something to lower your compression ratio, though.

It's very easy and relatively inexpensive to swap in a WRX 2.0 engine.
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Old 02-06-2005, 11:49 PM   #3
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sorry, im kind of a noob at car stuff. if i were to get the parts, could i have the suby dealer install it for me? and what is a compression ratio?
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Old 02-07-2005, 12:02 AM   #4
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You're asking some questions that require quite a bit of detail (and I'm certain that there would be more to follow); so I'd recommend that you take your questions to the technical forums. Also, if you search around there, you WILL find your answers.

Yes, the Subaru dealer should do it for you, but the labor cost would be pretty expensive and some dealerships aren't as friendly or helpful about it as others.

Your compression ratio is something I couldn't give you a textbook answer on, but it is derived from the size (volume) of your combustion chamber. Generally, factory turbocharged engines are lower compression and factory 'naturally aspirated' (non-turbo) engines that bill themselves as performance cars are higher compression. Higher compression means higher power compared to lower compression, but when you install a turbo to that engine, lower compression is desired for safety/durability.
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Old 02-07-2005, 12:04 AM   #5
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thanks for the info
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Old 02-07-2005, 12:29 AM   #6
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No sweat.
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Old 02-07-2005, 03:19 AM   #7
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With the exhaust side sorted and a td04 and intercooler, you should get away with 6 psi reliably.
Compression ratio is the ratio of the volume at Bottom dead centre (full) to the volume at top dead centre (compressed). You divide to calculate it.
Turbos normally run 8.5:1 or thereabouts, lower than n/a cars due to the mixture already being compressed.
A thicker head gasket will lower it enough for 10 psi max, i wouldnt run anymore than this on stock n/a pistons.
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Old 02-07-2005, 07:38 AM   #8
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Well, If you feel like investing in some back issues of Sport Compact Car, they did a turbo on there project 2.5rs. Might be worth looking at.
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Old 02-07-2005, 07:51 AM   #9
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Here is all the info you need...

http://www.rs25.com/forums/showthrea...888#post427888
http://www.rs25.com/forums/showthread.php?t=3541

but it recommended that you DO NOT turbocharge your engine... do a swap. It only costs $1 or $2k more and is 100% safer and more reliable. Besides the fact that you can just use WRX/STi parts from then on instead of custom making stuff. and there's more power possibilities!!

The EJ25's compression ratio is way too high for a safe turbocharge and if you were to do this... DO NOT skimp on enginemanagement. A standalone would be best, but it is just a matter of time of not if but WHEN your engine will die. A turbo will seriously decrease the lifespan of the EJ25. YES there are people who have been going 50-60k miles on just the stock block, but they really know the ins and outs of their cars. You would have to do MANY hours of research to know what to do and what to get.
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Old 02-07-2005, 08:57 AM   #10
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its ur car. have fun.
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Old 02-07-2005, 05:47 PM   #11
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wow, after reading your responses, i think i'll do without a turbo.
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Old 02-07-2005, 05:48 PM   #12
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It can be done..but yea, I'd recommend the swap. It'll save you the headaches. I went the aftermarket turbo route. It was fun for me. It was a great learning experience... yet expensive . I finally went the swap route and I'm much happier since this is my daily driver.

Otherwise... If you're looking for a turbo kit...I have a great starter for you: Uppipe, downpipe, turbo, oil lines (feed and return) and wastegate. Just need intercooler, exhaust and engine management(very very important).

Some more info: 00 and 01 RS's have 10:1 compression ratio. Most people start out with 5psi and with good engine management (standalone, injectors, etc) you should be able to get away with 8 psi. An RS w/ 5 psi can beat a stock wrx no problem.

Check out the aftermarket forced induction forum. It's getting quiet in there because of the popularity of engine swaps.
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Old 02-07-2005, 06:08 PM   #13
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Quote:
Originally Posted by Jiggs
wow, after reading your responses, i think i'll do without a turbo.
It really isn't as involved as it may seem. It has actually turned into a passion for me, not so much because of the great gain in power as it is because of the puzzle.

Sourcing the block, turbo, and exhaust is pretty straightforward and not too expensive, depending on how well you can shop; but finding an ECU and a crossmember seem to be a bit more involved.

Mind you, I haven't swapped a WRX motor/turbo into an RS...yet, but I have swapped a US STi engine and a Japanese STi transmission into my WRX wagon, along with a larger turbo and the complete turbo-back exhaust.

I did something wrong, but I believe I know what it was, but due to that I blew a piston, so my engine is on my workbench just awaiting new pistons and rings. Honestly, as daunting as that sounds, it really is easy. I've had my engine out twice now and prior to doing it, I was a complete and utter n00b. If I could do it, anyone can do it.
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