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Old 06-03-2002, 07:47 PM   #1
More Power
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Member#: 5767
Join Date: Apr 2001
Default Flat 6 Swap and Turbo

Has anyone swapped the new flat six from the Outback into a 2.5 RS? If you could turbocharge it you could get some major power. You could even go N/A with high compression pistons and make good power. Anyone have info on this engine?
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Old 06-03-2002, 09:22 PM   #2
Scooby Newbie
Member#: 4992
Join Date: Mar 2001
Location: Revelstoke BC, CANADA
2000 Impreza 2.5 RS
Blue Ridge Pearl



Why bother? The money involved in transplanting such an engine into an RS would be better spent on an EJ25-T. The EJ25 is ighter, probably stronger, has better weight distribution and is already in the car.

If you were going to go to that extent, just throw it in the trunk of a Legacy GT and have a rear-engine'd AWD H6. That, or buy a porsche.

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Old 06-03-2002, 09:43 PM   #3
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Chapter/Region: NWIC
Location: Burlington, WA


I thought the H6 and the EJ25 were actually really close to each other in size and weight?
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Old 06-03-2002, 10:58 PM   #4
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1995 Impreza w/EJ255
Brilliant Red

Default Size and weight

This has been discussed. The weight though marginal at 100lbs when put at the front would be quite bad. Also there was a questoin about it fitting under the hood interms of height. Also it was said you should go with the SVX engine for it's larger displacement. Not only that but the fact that there is no aftermarket for the engine will also make things more difficult. Do a search for more info.
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Old 06-04-2002, 06:00 AM   #5
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Member#: 1903
Join Date: Jul 2000
Location: Bay Area, I-Speed Tech
2000 2.5 RS-T coupe
T3/04 Link'd 2 10 PSI


I heard that the exhaust runners on the H6 were not designed that well either. Thats for NA i wonder how it would be when it comes to a forced induction application. But hey never know till you try, personally i think that would be badass. Twin turbo that **** supra killa
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Old 06-04-2002, 08:58 AM   #6
Z1 Performance
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The newer flat 6 is actually a loaded POS...IF you must do it (and I am not sure why you wold bother), the older H-6 from the SVX is a MUCH better option

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Old 06-04-2002, 09:16 AM   #7
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Member#: 64
Join Date: Jul 1999
Location: Lansing, MI
1999 Impreza 2.5RS
Rally Blue Pearl


No offense, but why do you say that? I don't mean to imply the new H6 is great, but I don't understand why it's so bad. Also, the H6 in the SVX is gigantic. It's sized like an EJ20 with two extra cylinders on the front (both in weight and dimensions), which it basically is. The new H6 is significantly smaller, only about an inch longer than an EJ25. Still heavier, of course, but less so than the SVX's H6.

I still wouldn't recommend either option unless you're really in the mood for headaches and want something pretty unique. A turbo EJ25 (especially a nicely built one) can make plenty of horsepower for any of us mortals.
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Old 06-04-2002, 10:01 AM   #8
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Chapter/Region: MAIC
Location: Manassas
2009 Acura MDX Sport


I know of a guy here in the mid-A who once had a XT, he swapped in a SVX motor, and made it twin turbo, paralel turbo's I believe.... then, his ex-wife totaled the car He has always told me, "if someone tells you it cannot be done, do it just to prove them wrong if nothing else, and if they ask why you want to do something, ask them, why not do it???

I had raised the topic of a ej30TT powered RS a while back.... search for threads, there are PLENTY of them....

In the future I want to build a ej25TT, with paralel turbo's, dual throttle bodies.... not like FAT's kit...
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Old 06-04-2002, 10:18 AM   #9
More Power
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Join Date: Apr 2001

Thanks for the info guys. I will do a search. I kind of figured it would be pointless, but thought I would see if anyone has done it.
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Old 06-04-2002, 11:41 AM   #10
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04 STi


RHdude, the current 6cyl motor is the EZ30, and shares nothing with the EJ. The SVX motor is based off of the early EJ series.
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Old 06-04-2002, 03:35 PM   #11
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Location: Wnnipeg, MB, Canada
1999 RS, Silverthorn


FAT has done a twin turbo SVX powerd Impreza.
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