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Old 07-26-2007, 06:13 PM   #1
Spades
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Default Engine Swap Sti + SVX

one of my good friends has a Subaru SVX. not sure what year. and he wants to buy a STI Engine for the SVX. Is it possible?? Has anybody ever done it before?? please let me know. Thx
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Old 07-26-2007, 08:49 PM   #2
Jonathan
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While its fairly common to swap the 4EAT automatic transmission on an SVX for a more reliable WRX 5-speed, I have never heard of doing an STi motor swap. Given enough time and money I suppose it is possible... But why ???

The big six in the SVX has a decent kick to it, especially after ditching the 4EAT.
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Old 07-26-2007, 09:40 PM   #3
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I've thought about this swap for awhile...

I personally think its a great idea.

Will it fit? 100% yes. The way the SVX engine/transmission mounts is the same as EJ drivetrains. You will actually have MORE room to work with. Plus, It will actually weigh less than the stock SVX drivetrain, leave lots of room for a nice front mount intercooler and thick radiator with nice fans (due to engine length), move the weight distribution of the vehicle closer to the center (IE more weight off the front of the car), and give you more horsepower of course WITH better aerodynamics than an Impreza...

Yes, it may take some custom work to get a few things to work properly, but not as much as you think. And as for keeping the SVX 6-cylinder engine... Well, its a good engine and all, but VERY prone to leaking and is kind of a pain. This swap would be much more interesting than being just another SVX with a manual transmission swap...
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Old 07-26-2007, 09:48 PM   #4
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Quote:
The big six in the SVX has a decent kick to it, especially after ditching the 4EAT.
It does indeed!

The only thing you would have to do is the wiring but other then that everything should line up and bolt in (including engine mounts). The tranny mounts will not line up and you will have to make custom braces for it to fit... and the rear dif has a LSD so if you want to utilize that there is some more modification to do...if not the rear end and drive shafts should bolt in nicely. You will also have to extend the shifter linkage 3 inches in order to have the shifter fit... you will have allot more room in the SVX engine compartment with that EG33 out of there....but why get rid of that motor? you can easily pump it up to 250 NA horses... Turbo charge it well... I dunno know... but why would you want to ditch the EG33????
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Old 07-26-2007, 10:02 PM   #5
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Quote:
Originally Posted by Kostamojen View Post
Yes, it may take some custom work to get a few things to work properly, but not as much as you think. And as for keeping the SVX 6-cylinder engine... Well, its a good engine and all, but VERY prone to leaking and is kind of a pain. This swap would be much more interesting than being just another SVX with a manual transmission swap...
True When I had the EG33 in my SVX the damn thing leaked coolant like a fiend. The problem lied in hoses and the radiator. Since the swap the motor has stayed dry and happy. My rear wheel bearings went 3 times in that car as well....not cheap to fix I tell you what.

Honestly the only thing the SVX has for it, is it's stance. It's wide and long. Other then that my SVX was a maintenance nightmare... If your looking for a good platform for a performance Subaru I'd recommend looking at something more reliable then the SVX.
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Old 07-27-2007, 11:42 AM   #6
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i too had thought about this a 92-95 svx +a ej20k+5mt would be a blast

possible issues:
front cross member
adaquite cooling
custom IC
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Old 07-27-2007, 03:34 PM   #7
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just do a whole 05+ newer swap, 5x114.3 hubs and 6 speed. = the shnitz
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Old 07-27-2007, 03:53 PM   #8
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doing all that work for an extra ~70hp doesn't seem worthwile to me. granted, the STi engine is a lot more tuneable than the SVX, but part of the SVX's allure is that it gets all that weight moving quickly, thanks to all the low-end grunt provided by that 3.3 liter motor. slap in a turbo motor complete with turbo lag and the car loses its "get up and go from any speed" charm..

the 3.3 is bulletproof, i'd tell your buddy to swap the transmission out for a stickshift (5-speed.. an NA 6-cylinder won't benefit from the close ratios of a 6-speed in the way that a peaky turbo motor will) and save the rest of his money..
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Old 07-27-2007, 04:07 PM   #9
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Quote:
Originally Posted by alacrity024 View Post
the 3.3 is bulletproof
Uh... no.

And its easier to get 400hp (and TORQUE too!) out of that STI engine than it would be to get 300hp out of the EG33...
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Old 07-28-2007, 11:31 AM   #10
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dude take allot of photos of the process and post them I've been having the same idea for awhile I like the way the SVX looks and thinking of picking one up myself I am currently getting ready to do a 06 WRX swap into my00 RS but once I complete that project I think I will pick me up a SVX and build a sick motor for it a 4banger of course.
good luck with your project!
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Old 07-28-2007, 06:59 PM   #11
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In a way the EG33 is bulletproof. Sure it is more of a chore to get the car to the same power level as a tuned EJ. But the car was an engineer's dream. The car itself was ahead of its time. A few of the FHI based engineers I've met have also praised the SVX and own one. Unfortunately it was sold at the wrong time in Subaru's slow era.

I wouldn't say they were leaky engines. In fact on our own SVX (MY92 145K miles) the only leaks there were just seeps. And I've done everything myself on the car, and it's not harder than working on my EJ207, maybe a little, but not like an EZ30.

The most problematic part the vehicle was the transmission, which was swapped out at 90K, and has had an external ATF cooler then.

I believe I never seen anyone swap an EJ engine into a SVX before. And I would love to see the results of anyone who wishes to attempt it.

-paK +2
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Old 04-04-2011, 11:15 AM   #12
gregjoburg
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Default gregjoburg

I am busy marinizing a EG33 could anybody direct me to a maintenance
manual as the svx was not released in South Africa and I am working
blind
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Old 04-12-2011, 09:24 AM   #13
nimrod8560
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As far as I know the SVX never had a manual trans, only autos.
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Old 04-13-2011, 12:58 PM   #14
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what? ej instead of eg????
try to turbo it, or rebuild NA high CR.
Hydra has ready solutions.
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Old 04-16-2011, 03:21 AM   #15
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Quote:
Originally Posted by Kostamojen View Post
Uh... no.

And its easier to get 400hp (and TORQUE too!) out of that STI engine than it would be to get 300hp out of the EG33...

Proof?? (I mean the EG33 reliability part.)


You can get 300+whp NA from that motor. There are turbo SVXs around making lots of power on a stock engine.


True you can get alot of power from a sti engine but north of 400hp reliability goes down. Even built the stress from the power reduces engine life considerably as power goes up. The 3.3 will have alot lower BMCP for the same power output as a 2.5 would. That is physics you cant get around.

The 3.3 is built using very similar components to the NA EJ22. IIRC the pistons are different but the rods can be made to work if you get different pistons. If you want to make big power on a 2.5 you have to build it anyway so why not build the EG33 for boost.


My opinion keep the 3.3 swap the tranny. If you want to make alot of power yank the cams throw on a exhaust and get a tune. Power will easily be north of 300hp. If you remove the special chassis weight subaru installed it will weight ALOT less. IIRC you can get close to the 3200lbs mark.
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Old 05-22-2018, 09:58 PM   #16
Kris92svxOlsen
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Default Eg33

Quote:
Originally Posted by scby rex View Post
just do a whole 05+ newer swap, 5x114.3 hubs and 6 speed. = the shnitz
I'm doing this exact swap (05 sti set-up in my 92 SVX) and have a few questions about my rear end. Anyone with actual knowledge about this swap willing to answer some questions please email me! 🙏
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Old 09-02-2018, 07:57 AM   #17
92 SVX
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Quote:
Originally Posted by Kris92svxOlsen View Post
I'm doing this exact swap (05 sti set-up in my 92 SVX) and have a few questions about my rear end. Anyone with actual knowledge about this swap willing to answer some questions please email me! 🙏
The SVX rear diff is a VLSD R160, the limited slip is some what stronger then the VLSD of the 02+ wrx. the svx gear ratio is 3.54 The rear bearings are the exact same bearings the 05+ STi uses, the lug pattern is 5x114.3 the sti brembo rear brakes will fit on the svx However the hub backing plate from the sti has to be swapped to the svx rear hubs.


All that being said this is only my opinion and you can judge from my name my bias.... Turbo the EG33, even as little as 12 psi on a GT35 or larger turbo will get you 500hp to the wheels if you want. Put the sti 6 speed and R180 rear diff in( the sti rear axles will slide right in the hubs) and have a torquey fun reasonable high hp setup. I don't know what the longevity of 500 awhp will be on a completely stock engine but I know it will go 50k or more as at least one guy I met online has had his going that long.

And if longer longevity and reliability is what your looking for tear down the EG and put some STi forged rods in, though come to think about it pauter http://pauter.com/shop/rods/subaru/s...-3l-eg33-rods/ and some custom forged pistons, either in stock compression ratio or lower compression for higher boosted.
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