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Old 09-03-2010, 11:12 PM   #51
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pure talent.
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Old 09-03-2010, 11:22 PM   #52
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I'm amazed at how perfect the EJ motor fits in the Porsche. It truly is one of the most awesome things I've seen in quite awhile. The exhaust set-up is also a thing of beauty, but I'm not really a big fan on the design to be honest. The wastegate dumps coming out behind the car aren't for me, but I know it's a Euro thing. Good luck finishing up your build, I can't wait to see the numbers this car makes and the lap times it puts down!

The one negative thing I'm going to say is the header is super long, way longer than on any Impreza due to the turbo location. Is there no other place to mount it? Even though this entire setup is a huge step up from the stock motor like you've said, having that much piping might make the car a bit laggy. I'm one of the people who don't mind lag (I have a T04S which is a non ball bearing GT35) but many people are afraid of buying a 20G due to lag lol. I myself am by no means even close to as good a fabricator as you, so please don't think that I'm one of the idiots on here that thinks they know everything lol. I assume the turbo is in the best location you possibly could fit it, I was just pointing out the issue and asking anyways.

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Old 09-04-2010, 11:22 AM   #53
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Originally Posted by domestic_abuser View Post
I'm amazed at how perfect the EJ motor fits in the Porsche. It truly is one of the most awesome things I've seen in quite awhile. The exhaust set-up is also a thing of beauty, but I'm not really a big fan on the design to be honest. The wastegate dumps coming out behind the car aren't for me, but I know it's a Euro thing. Good luck finishing up your build, I can't wait to see the numbers this car makes and the lap times it puts down!

The one negative thing I'm going to say is the header is super long, way longer than on any Impreza due to the turbo location. Is there no other place to mount it? Even though this entire setup is a huge step up from the stock motor like you've said, having that much piping might make the car a bit laggy. I'm one of the people who don't mind lag (I have a T04S which is a non ball bearing GT35) but many people are afraid of buying a 20G due to lag lol. I myself am by no means even close to as good a fabricator as you, so please don't think that I'm one of the idiots on here that thinks they know everything lol. I assume the turbo is in the best location you possibly could fit it, I was just pointing out the issue and asking anyways.

The wastegate dumps were done like that because I didn't want to just dump them straight down under the car in front of the rear bumper. I want all of the exhaust gasses to exit behind the car not under it. If I decide to go with a flat bottom and rear defuser, I don't want to have to go back and fix this later. As far is it being a Euro thing... I don't know about that because I'm not into Euro cars really. I just thought it would look cool, and so far, you are the first person who hasn't cared for the look. (which is fine)

As far as the headers being "long"... While it's true that they are longer than the aftermarket EL Subie headers, they aren't a whole lot longer in reality once you factor in the up-pipe. Also, I did a lot of test fitting, and analyzing before I settled on this turbo location, and truth is, there is really nowhere else in the chassis for it to go. You have to remember, in these pictures, there are a lot of suspension pieces and other parts missing that restrict turbo placement, especially with such a relatively large turbo.
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Old 09-04-2010, 11:37 AM   #54
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Just going to voice a things I noticed. Not meaning to step on toes.

1.) Is the turbo in the crumple zone?
2.) Where's the oil return on the turbo in comparison in level with the oil pan? planning to run a return pump?
3.) possible noise issues for tracks with noise limits...?
4.) long tube manifold and turbo weight that far back...just don't seem ideal but I'm not there to see if there's any other possible location...just thoughts.

Looks sexy though!
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Old 09-04-2010, 11:56 AM   #55
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Originally Posted by Homemade WRX View Post
Just going to voice a things I noticed. Not meaning to step on toes.

1.) Is the turbo in the crumple zone?
2.) Where's the oil return on the turbo in comparison in level with the oil pan? planning to run a return pump?
3.) possible noise issues for tracks with noise limits...?
4.) long tube manifold and turbo weight that far back...just don't seem ideal but I'm not there to see if there's any other possible location...just thoughts.

Looks sexy though!

1. There's nowhere else to put the turbo so whether or not it's vulnerable in an impact doesn't really matter. I mean in the Porsches the radiators are right up at the front corners so if it's not one thing, it's another.
2. The oil pan to turbo level are border line, so I will probably run a scavenge pump just to be safe.
3. noise issues will be addressed with a muffler system which the wastegate dumps will feed into. I will basically have to swap out the exhaust for those tracks, which is part of the reason I built everything with V-bands. The good thing... as of right now, there are no open tracks in AZ with noise restrictions.
4. Like I said, the turbo location is not "ideal" but there really is no ideal place for it. This was the best compromise given the space restrictions and the fact that I don't want the turbo sitting next to any plastic, rubber, or fluid lines.

Here's what Porsche did when they built a mid-engined turbo race car...

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Old 09-04-2010, 12:13 PM   #56
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Well, I don't do much of my car design based off of the 80's
...but I know all about making racecars and compromises. It is all a balancing act!
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Old 09-04-2010, 12:21 PM   #57
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Well, I don't do much of my car design based off of the 80's
...but I know all about making racecars and compromises. It is all a balancing act!
I can agree there. Aluminum chassis FTL!!! but it's an example of space restrictions when you are dealing with horizontally opposed, mid-engined turbo cars. If this were a V style engine, or even an inline, there would be a lot more choices available, but not so with this car.
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Old 09-04-2010, 12:55 PM   #58
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I will say that a rotrex blower should have no issue packaging on the frontside of the engine though...could be a sexy and potentially lighter package.

But now I'm just kicking out ideas.

Boxer engines do make for a pain in single turbo packaging.
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Old 09-04-2010, 09:00 PM   #59
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are you thinking about a blow through maf or speed density...

did cobb ever get speed density to work on the 32 bit ecus
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Old 09-04-2010, 09:31 PM   #60
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Nice job, quality work. What does a blown up boxster sell for? Do they blow up the stock engines often?
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Old 09-04-2010, 09:32 PM   #61
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That is a sick setup. Did you ever consider mounting twin turbos directly to the head? May be a bit more difficult with the 4 cylinder firing order though.


keep the pics coming!

Ben
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Old 09-06-2010, 12:35 AM   #62
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are you thinking about a blow through maf or speed density...

did cobb ever get speed density to work on the 32 bit ecus
Blow through would make things easier, but if not, I can always extend the MAF sensor wiring and just run it back to the turbo where the air filter will be. I'll be doing a ton or wiring anyway so what's another couple wires?
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Old 09-06-2010, 12:40 AM   #63
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Nice job, quality work. What does a blown up boxster sell for? Do they blow up the stock engines often?
YES, the stock engines are JUNK. Their common failure modes range from dropped cylinder sleeves, D-chunking cylinder walls, Intermediate Shaft Bearing failures, Oil starvation which leads to spun bearings, broken rods, hydro-locking due to failed AOS, and the list goes on. On top of that, they are extremely heavy weighing in at around 450lbs fully equipped. Oh, and they are ridiculously expensive to replace.

Used Boxsters with blown motors can be had for as cheap as $3000 depending on their condition, and whether they are a base model, or an "S". I paid $3500 for the car in this thread, and it's a 2000 "S"
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Old 09-06-2010, 12:55 AM   #64
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YES, the stock engines are JUNK. Their common failure modes range from dropped cylinder sleeves, D-chunking cylinder walls, Intermediate Shaft Bearing failures, Oil starvation which leads to spun bearings, broken rods, hydro-locking due to failed AOS, and the list goes on. On top of that, they are extremely heavy weighing in at around 450lbs fully equipped. Oh, and they are ridiculously expensive to replace.

Used Boxsters with blown motors can be had for as cheap as $3000 depending on their condition, and whether they are a base model, or an "S". I paid $3500 for the car in this thread, and it's a 2000 "S"
Awesome. I forsee a decent market for these cars then, being so cheap and subaru engines so readily available and cheap as well.

I don't have the metal fab skills to make the adpater plate or subframe, but the rest of the wiring and plumbing I could handle.

I'll follow this thread, I might be interested in trying my hand at building a few of these if you go to market with a kit.
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Old 09-06-2010, 01:15 AM   #65
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i don't see why people are making a big deal from the extended exhaust pipes. i've worked on a few boxters and the picture makes it look longer than it really is. The short downpipe/exhaust makes up for the longer header pipes.

there has been many sucessful installs using a rear mount turbo, ahem* http://www.ststurbo.com/

keep up the great work. i'll def be following this thread
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Old 09-06-2010, 01:26 AM   #66
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i don't see why people are making a big deal from the extended exhaust pipes. i've worked on a few boxters and the picture makes it look longer than it really is. The short downpipe/exhaust makes up for the longer header pipes.

there has been many sucessful installs using a rear mount turbo, ahem* http://www.ststurbo.com/

keep up the great work. i'll def be following this thread
You are right, the pictures make the exhaust look longer than it really is. If you saw it in person, you wouldn't think twice. Plus, the intercooler plumbing will be REALLY short. On this car, it will go up into the rear trunk, into the intercooler, and directly into the throttle body on the other side of the rear bulkhead.
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Old 09-06-2010, 01:27 AM   #67
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Awesome. I forsee a decent market for these cars then, being so cheap and subaru engines so readily available and cheap as well.

I don't have the metal fab skills to make the adpater plate or subframe, but the rest of the wiring and plumbing I could handle.

I'll follow this thread, I might be interested in trying my hand at building a few of these if you go to market with a kit.

That's the plan. I know there will be people who will want complete kits, and some who will want to try and figure out a lot of it themselves, but either way, I'll have the parts they need.
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Old 09-06-2010, 01:30 AM   #68
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*sprut*. Why the choice of a Subaru mill? Cost/aftermarket?
Because a reliable M96 rebuild and turbo setup would cost almost $40k.
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Old 09-06-2010, 01:33 AM   #69
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Because a reliable M96 rebuild and turbo setup would cost almost $40k.
This man knows what he's talking about. Plus, in the end, you would still be stuck with a heavy, bulky, and complicated M96 that was NEVER intended to be boosted.
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Old 09-06-2010, 01:33 AM   #70
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Nice job, quality work. What does a blown up boxster sell for? Do they blow up the stock engines often?
About 8k, and yes they blow up often. Not many Boxsters with more than 100k miles.

****ty pistons, rods, sleeves, IMS failures. It's like a factory build booby trap.
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Old 09-06-2010, 01:36 AM   #71
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This man knows what he's talking about. Plus, in the end, you would still be stuck with a heavy, bulky, and complicated M96 that was NEVER intended to be boosted.
Jake Raby can build you a reliable, fully forged, low compression, updated IMS, nickisil cylinder liner engine ready for boost for around 25k. TPS makes a turbo kit, but it's another 15k.

I agree that this is a great option, there are quite a few 914s with Suby power running around. You may be able to source some parts from Renegade. How much do you think you will end up spending with this set up? They only thing that makes a race prepped M96 attractive is being able to keep stock ECU.

There is even a Porcshe technician trying to put a LS3 in a Boxster.

Last edited by silver arrow; 09-06-2010 at 01:43 AM.
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Old 09-06-2010, 01:42 AM   #72
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How much do you think you will end up spending with this set up?
That is a loaded question. A lot of it depends on how the kit is built. I'll have more defined figures after I finish the first test car and the first street version of the kit
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Old 09-06-2010, 01:46 AM   #73
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There is even a Porcshe technician trying to put a LS3 in a Boxster.

Yeah I know Brad. Last time I talked to him, he said he was getting close but is trying to keep everythying a secret until it's done.

BTW, this isn't my first Subie Powered Porsche Conversion...


http://www.precisionchassisworks.com...nversions.html
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Old 09-06-2010, 01:56 AM   #74
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Yeah I know Brad. Last time I talked to him, he said he was getting close but is trying to keep everythying a secret until it's done.

BTW, this isn't my first Subie Powered Porsche Conversion...


http://www.precisionchassisworks.com...nversions.html
That's cool, I wasn't try to imply you didn't know what you were doing, just trying to be helpful.

The only thing I would miss about the Boxster engine would be the beautiful sound of the flat 6 at 7000 rpms. No suby can match it. My old 05 STi with a Prodrive muffler was close though.

Anyway, do you think the radiators will be able to cool this beast?

Good luck, I'm really looking forward to seeing how this build goes.
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Old 09-06-2010, 02:01 AM   #75
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That's cool, I wasn't try to imply you didn't know what you were doing, just trying to be helpful.

The only thing I would miss about the Boxster engine would be the beautiful sound of the flat 6 at 7000 rpms. No suby can match it. My old 05 STi with a Prodrive muffler was close though.

Anyway, do you think the radiators will be able to cool this beast?

Good luck, I'm really looking forward to seeing how this build goes.
I know you weren't. You just mentioned the 914's so I figured I would give an example.

As for the radiators, I think by the time you add the third radiator the the base model cars, there shouldn't be any problems. I mean look at the Subie radiators. They aren't exactly large, and add to that the extra cooling system capacity of the Boxsters, and I don't see there being a problem... especially for street cars. If I do run into any problems on this track car, I can always upgrade to the turbo radiators, but that won't be cheap
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