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Old 09-08-2001, 08:01 PM   #1
Fubaru
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Default H6 3.0 turbo?

Just curious, how many Mr. Ed's could you pull out of the Subaru H6? Will Subaru ever sell an H6 turbo anywhere?
The Porsche 911 H6 has about 300 horses and I think the turbo 911 has over 400 horses, but I'm not sure about displacement.

Practically speaking I guess there are very few MY02 Outback owners out there considering to turbocharge their car.
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Old 09-08-2001, 08:48 PM   #2
JaMa
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Default Drop into an Impreza Body

Sure would be interesting to drop that puppy into a WRX or RS and turbocharge it. Probably take a lot of modification though - I doubt the Impreza engine bay is deep enough to handle that large of a motor- would need a lot of surgery.

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Old 09-08-2001, 08:56 PM   #3
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Among other things, you'd probably have to get other pistons or lower the compression in some other way. I believe the stock compression on the H6 is 10.7:1, making it less than optimal for turbocharging. Unfortunately, the pistons for the H6 are a different bore than the WRX pistons (you might think that the H6-3.0 is an H4-2.0 with 2 extra pistons, but alas, it doesn't work that way). Also, the block is sort of compressed, as it's only a bit longer than the EJ25 block; I don't know how much structure has been sacrificed for the sake of compactness there. Finally, I've never seen one of these engines in a car, and I don't know how much room there is to plumb the piping and other turbo necessities. Those are a few of the issues you'd have to resolve in such a project. But if you pull it off, save all your notes and secrets, 'cuz I want one.

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Old 09-08-2001, 09:58 PM   #4
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Lessee here, it has 212 hp stock, I think with lower compression pistons and about 8 lbs of boost, you could easily do 300. A few EJ25's are pulling 300 or so, and EJ20's, too. No reason a turbo H6 couldn't end up being the powerplant in, say, a new SVX.
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Old 09-08-2001, 11:13 PM   #5
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Anybody remember what the number people got from Twin Turboing their SVXs with 3.3 litre H6?

If I remember right it was somewhere in the neighborhood of 350 400 hp.

Some of us in the Legacy crowd have been petitioning SOA to give a B4 like Legacy. One that has a power plant worth buying.

My dream would be that they ressurect the 3.3 H6 and develope a stock forced induction setup and fit it to an STI 6-speed. We'll see what we get. We figure the worst thing that could happen is they would put an NA H6 with a 5speed or use the same EJ20 turbo thats in the WRX.

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Old 09-09-2001, 12:52 AM   #6
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Quote:
Sure would be interesting to drop that puppy into a WRX or RS and turbocharge it. Probably take a lot of modification though - I doubt the Impreza engine bay is deep enough to handle that large of a motor- would need a lot of surgery.
Actually, the six is only about an inch or so longer than the four, so it should have no problem fitting any of the existing engine bays.
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Old 09-10-2001, 12:10 AM   #7
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Quote:
Originally posted by MY99 2.5GT
We figure the worst thing that could happen is they would put an NA H6 with a 5speed or use the same EJ20 turbo thats in the WRX.
The worst that could happen is that they'd keep selling the same 2.5GT and raise the price.

Don't get me wrong, I drove a GT for four years and loved it -- my fiancée drives it now, and loves it -- but the WRX is a whole new world.

Dan
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Old 09-10-2001, 10:24 AM   #8
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The H6 is heavier too, the car will understeer real bad.
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Old 09-10-2001, 10:48 AM   #9
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H6 may only be an inch longer but does anyone know about width and height fitment?

Brad
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Old 09-10-2001, 12:21 PM   #10
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Run with two small (ish) turbos and only 7-9 psi and you will make more then 300 on the factory setup.

Get two t25's from a 95-99 DSM, build your custom manifolds to position the turbos down a little low, then run the compressor outlets strait up to the end tanks of an IC (split on the intake inside) and into the Throttle body.

You will need a faily large external wastegate (TiAL 45mm minimum) before the turbos to keep boost that low.

After the turbos, run two 3" exhaust back. Get an "X" pipe or balance pipe and you will increase scavaging in the back and actually pull the exhaust out (in theory. Hasn't been tested on a tt 6 cyl dual ex turbo car).

You may need a check valve on the map sensor in which case you'll want a rising rate regulator and a larger fuel pump.

The transmission on the other hand is no problem/big problem. Kinda hard to be both, but some how Subaru manages it. The h6 will bolt to a regular Subaru 5 speed. And it will fit great. Only problem is keeping 2nd gear. You could go with a different final drive ratio to get you out of gears faster or you might want to try some other things I can't divulge at the moment. Due time...

All in all, it can be done. I have definately looked into it for a parts runner car. The torque would be amazing!!!!
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Old 09-10-2001, 06:59 PM   #11
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Quote:
Anybody remember what the number people got from Twin Turboing their SVXs with 3.3 litre H6?
I have never seen anybody twin turbo an SVX, but there is a shop in California that builds twin turbo 3.3 H6 Subaru motors for Racing Buggys.

No, it won't fit in the engine bay of the SVX anymore because of all the extra plumbing. And from what I hear, they produce between 550 and 600hp.

These are pure racing motors built on the 3.3 block. Just an idea of what you can do when you take your motor to the limit I guess.



-Danny
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Old 09-11-2001, 12:58 AM   #12
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the 3.0L H6 engine is only half an inch longer than a 2.5L engine. or so they say in subaru school for salesman. as for heavier, i don't think it's that much heavier than the 2.5L but i could be wrong.
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Old 01-03-2020, 10:18 AM   #13
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I know, old thread, but I just ran in to this looking for something else.

If anyone running across this doesn't know yet, I've boosted an EZ30D in a 2001 Outback VDC with a centrifugal supercharger, 650cc injectors, WRX 3 bar MAP, adjustable/progressive fuel pressure regulator, WTA intercooler and tuning the stock ECM with all stock internals. It went 48k miles before a detonation event caused by a failing injector. I run up to 12 psi and have calculated approximately 450 HP at the crank; About 302-305 at the wheels with the automatic transmission. The VDC system still works and I can run gas or E85. It loves E85.

https://www.subaruoutback.org/thread...6/#post-455755
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Old 01-14-2020, 01:10 AM   #14
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Quote:
Originally Posted by cardocm View Post
I know, old thread, but I just ran in to this looking for something else.

If anyone running across this doesn't know yet, I've boosted an EZ30D in a 2001 Outback VDC with a centrifugal supercharger, 650cc injectors, WRX 3 bar MAP, adjustable/progressive fuel pressure regulator, WTA intercooler and tuning the stock ECM with all stock internals. It went 48k miles before a detonation event caused by a failing injector. I run up to 12 psi and have calculated approximately 450 HP at the crank; About 302-305 at the wheels with the automatic transmission. The VDC system still works and I can run gas or E85. It loves E85.

https://www.subaruoutback.org/thread...6/#post-455755

Holy bump. Love the thread and it sparked my interest to eventually boost an H6 unopened block one day. Nothing beats the sound but it still makes more sense to make those power levels with a boosted EJ though!

Any updates on the new motor and injectors?
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