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Old 01-28-2011, 11:30 AM   #1
slackaforlife
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Default Porsche flat six swapped into a Subaru. Has anyone tried this?

Has anyone ever tried finding a flat six Porsche motor that will fit into any 2002 and up impreza? I know this is not a cheap swap but my curiousity got the best of me when I began to think and what better place to ask than here. I'm sure there's numerous problems you would run into because of the increased torque but realistically what do you guys think? I don't post in the forum too often but I've been a long time thread browser. Please post any comments that you feel relate to the topic. Thanks in advance for the knowledge. ( yes I already searched to see if there was another thread on this and came up with very little information.)
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Old 01-28-2011, 02:28 PM   #2
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torque isn't an issue at all aside from the usual driveline...see any built subaru.

The motors are wider and thus chassis becomes an issue. The canbus system and wiring would suck too.

If you want a 'big' flat 6, pick up and EG33 and I can take it out to 3.8L fairly easily.
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Old 01-28-2011, 02:46 PM   #3
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Quote:
Originally Posted by slackaforlife View Post
Has anyone ever tried finding a flat six Porsche motor that will fit into any 2002 and up impreza? I know this is not a cheap swap but my curiousity got the best of me when I began to think and what better place to ask than here. I'm sure there's numerous problems you would run into because of the increased torque but realistically what do you guys think? I don't post in the forum too often but I've been a long time thread browser. Please post any comments that you feel relate to the topic. Thanks in advance for the knowledge. ( yes I already searched to see if there was another thread on this and came up with very little information.)
it is quite easy to get a LOT of torque outa an h4 subaru......way more than what would make a porsche swap worthwile

the driveline then becomes the issue
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Old 01-28-2011, 03:37 PM   #4
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I do agree with Scotty however that fact that a reflash with upgraded but still catted exhaust nets 520'ish lb-ft and 480 whp or so is nothing to laugh about...oh and it's pump gas.
Of course that's also like $9k on top of a $25k engine...so an entire STi
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Old 01-28-2011, 03:57 PM   #5
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it is quite easy to get a LOT of torque outa an h4 subaru......way more than what would make a porsche swap worthwile

the driveline then becomes the issue
The benefit of the swap would be the driveability. Many prefer the linear nature, and throttle response of an N/A powerplant.

I'd be willing to bet many would enjoy a 350 HP 3.8l N/A Suby to, say, a 400 turbo 2.5l in the same chassis.
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Old 01-28-2011, 05:37 PM   #6
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Thanks for all the responses guys. Let's be honest, a car pushing that much hp is much more likely to be more reliable if it's all motor, as opposed to a 2.5l 4 cyl that's running a bigger turbo and higher boost. Even the flat six with a small turbo would be leaps ahead. If only money wasn't the only thing holding me back. I'd love to see someone who has that kinda cash to throw around try something like this. I've looked into the h6 motor(s) and thought that, hell porsches run flat sixes and Ive seen suby motors swapped into boxsters. Just imagine how much power could be made with say a 99 2.5rs if you ran a flat six with a big turbo. I guess this is the result of me being stuck in the hospital for 4 days. Please keep the comments coming, all input is good input.
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Old 01-28-2011, 09:41 PM   #7
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It's easier to fit in one of the Suby H6's and there is plenty of support already if you look around. I personally preffer H6+Turbo. :ContinuesTwidelingThumbsAsIWaitToFinishMine:
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Old 01-28-2011, 11:36 PM   #8
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How can you prefer something that you haven't tried? Yeah it'd most definitely be easier to do an h6 swap because it's coming out of a Subaru, but a flat six out of a Porsche is so much more badass. And because it's a more powerful platform to build off of that will almost definitely have more aftermarket parts for it to make the motor that much more powerful. And how many Porsche swapped subarus has anyone heard of?
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Old 01-28-2011, 11:55 PM   #9
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I'd love to see someone who has that kinda cash to throw around try something like this.
Somebody with that kind of cash would be smart to just buy a Porsche.
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Old 01-29-2011, 07:18 AM   #10
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Aparantly there was one guy that did that up in the north island.
I did get shown poor quaitly pics of it Plus a bad quaitly cell phone vid.
It would light up all four wheels easly.
The flat 6 it had in it didnt look like a EG or a EZ from what I could tell.
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Old 01-29-2011, 05:56 PM   #11
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Somebody with that kind of cash would be smart to just buy a Porsche.
Which would defeat the purpose of having a front mounted flat six. Because aren't panamaras, 944, and maybe another two models the only front mounted porsches? And that'd be a cheap Porsche. You can find a decent shell of a suby for less than 3 grand. Figure 15000 to be safe with motor and trans and electrical. I see what your saying and where your coming from but it wouldn't unique. People see porsches all the time. But what about a suby thats Porsche powered? I was going more for originality, as opposed to being realistic.
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Old 01-29-2011, 08:46 PM   #12
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This project would cost at least as much as a 10 year old 911 all said and done (can be had for mid to low 20's). Yeah you'd have a unique car and probably get some compliments on it being so. However, park a 10-15 year old Impreza with a 911 engine next to a 10 year old 911 and what do you think most people work rather have. Sprechen sie Deutsch?
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Old 01-29-2011, 09:00 PM   #13
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I'd rather be underestimated anyway.
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Old 02-01-2011, 09:58 PM   #14
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Quote:
Originally Posted by slackaforlife View Post
How can you prefer something that you haven't tried? Yeah it'd most definitely be easier to do an h6 swap because it's coming out of a Subaru, but a flat six out of a Porsche is so much more badass. And because it's a more powerful platform to build off of that will almost definitely have more aftermarket parts for it to make the motor that much more powerful. And how many Porsche swapped subarus has anyone heard of?
The motor it's self will be the only thing with support. After that you're gonna have to do custom work. Not saying don't do it just asking why. The other problem is the Porsche larger displacement H6's are gonna be heavier as well as more powerful in theory. Just measure everything and map it out before you go putting money down.
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Old 02-01-2011, 11:21 PM   #15
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Going out on a educated guess here, but I would guess that if you spent the money in the right places (custom bearings, precision machine work, etc.) dollar for dollar, HP for HP a Subaru H6 based motor will be more reliable than the Porsche based motor. Especially if the cost of Porsche entry is really $15K-$24K.
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Old 02-02-2011, 01:21 AM   #16
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Okay, I've been watching this thread waiting for it to die it's own miserable death, but for some reason, people continue to drag it along.... sigh...

First off. You say Porsche flat 6, but you fail to mention which specific flat 6 you think you would want to use. For water cooled, your choices are...

M96/97 (which came in the Boxster, Cayman, 996/997) These come in various forms from 2.5 liters, all the way up to 3.8 liters. ALL of them are full of design and manufacturing flaws that make the Subaru engines look like engineering marvels. On top of that, they are HEAVY, and as far as power output goes... unless you are talking about the large displacement X51 version, they are unimpressive IMO.

Then there's the "GT1" based engines which are basically early 964 based air cooled engines with water cooled cylinders and heads. These were used ONLY in the GT3 variants, and twin turbo versions of the 996/997 lineup. These engines are the ones that are worth a damn. These are the engines you will find in Porsche's race cars and they are proven to be relatively reliable, and capable of making some impressive HP numbers. These are also the engines that are VERY expensive to buy, maintain, and service. Also, they are not lightweight and not compact. Because these engines are based off of the air cooled bottom end, they use the same 4 bolt tranny pattern that you will find in VW/Porsche applications.

Then there's the newest Porsche flat 6 called the 9A1. These were introduced in 2009 so unless you are a Porsche certified technician, there aren't many people who know a whole lot about these. From what I've heard, Porsche is going back to the idea of one common engine in all of their flat 6 based cars... and it's about time too. I mean how stupid do you have to be to go through the trouble of producing two radically different flat 6 engines and then make one far inferior to the other. Anyway, there will be a lot of different displacements of this engine and this will likely be THE engine that Porsche starts using in their factory based race cars... assuming they don't have any serious issues with them while testing. From what little I do know about them, it sounds like Porsche was able to fix some of the problems they had in the M96/97 based engines... specifically, they eliminated the entire intermediate shaft system (which Subaru has NEVER used).

So even if you can decide which engine you think you want to use, what on earth are you going to use for a transaxle and why hasn't anybody else asked this most basic and simple of questions?

Last edited by kcpaz; 02-02-2011 at 02:16 AM.
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Old 02-02-2011, 12:01 PM   #17
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well a tranny adapter isn't that hard to do but you know that

The most basic problem and question was how on earth would he fit the Porsche motor in? chop the chassis up

If someone wants to put a flat 6 into a subie, make life easy and just use a subaru engine. It's been done and both the EG33 and EZ30(R and D) have been boosted. The EG33 is the 'big block' of the two. The EZ line up is a much more compact engine and hasn't been developed and tested as much as the EG.

You want a 3.8L flat six, source an EG33 and shoot me an email.
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Old 02-02-2011, 02:23 PM   #18
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Thank you. I'd love to know more on the Prsche end but the EZ30R is the closest to a Porsche as will happen as Porsche had a hand in turning the EZ30D into the R variant. Only major tech advantage of some of the Porsche motors is dirrect port fuel injection but still as you said the 3.0R is the best bet for reliable nubmers like a Porsche. EG33 is also on my list. I own both these motors and can't wait to get a job again and tear into both.
Quote:
Originally Posted by kcpaz View Post
Okay, I've been watching this thread waiting for it to die it's own miserable death, but for some reason, people continue to drag it along.... sigh...

First off. You say Porsche flat 6, but you fail to mention which specific flat 6 you think you would want to use. For water cooled, your choices are...

M96/97 (which came in the Boxster, Cayman, 996/997) These come in various forms from 2.5 liters, all the way up to 3.8 liters. ALL of them are full of design and manufacturing flaws that make the Subaru engines look like engineering marvels. On top of that, they are HEAVY, and as far as power output goes... unless you are talking about the large displacement X51 version, they are unimpressive IMO.

Then there's the "GT1" based engines which are basically early 964 based air cooled engines with water cooled cylinders and heads. These were used ONLY in the GT3 variants, and twin turbo versions of the 996/997 lineup. These engines are the ones that are worth a damn. These are the engines you will find in Porsche's race cars and they are proven to be relatively reliable, and capable of making some impressive HP numbers. These are also the engines that are VERY expensive to buy, maintain, and service. Also, they are not lightweight and not compact. Because these engines are based off of the air cooled bottom end, they use the same 4 bolt tranny pattern that you will find in VW/Porsche applications.

Then there's the newest Porsche flat 6 called the 9A1. These were introduced in 2009 so unless you are a Porsche certified technician, there aren't many people who know a whole lot about these. From what I've heard, Porsche is going back to the idea of one common engine in all of their flat 6 based cars... and it's about time too. I mean how stupid do you have to be to go through the trouble of producing two radically different flat 6 engines and then make one far inferior to the other. Anyway, there will be a lot of different displacements of this engine and this will likely be THE engine that Porsche starts using in their factory based race cars... assuming they don't have any serious issues with them while testing. From what little I do know about them, it sounds like Porsche was able to fix some of the problems they had in the M96/97 based engines... specifically, they eliminated the entire intermediate shaft system (which Subaru has NEVER used).

So even if you can decide which engine you think you want to use, what on earth are you going to use for a transaxle and why hasn't anybody else asked this most basic and simple of questions?
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