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> Subaru Engine w/Boxster transaxle, Perfect fix for 914???
charliew
post Aug 26 2010, 03:44 PM
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Twin scroll, will you be able to use a factory header? It also looks like the motor cradle will allow a fatter oil pan but with the stuff you are doing it will probably be a dry sump right?
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precisionchassis
post Aug 26 2010, 05:30 PM
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QUOTE(charliew @ Aug 26 2010, 02:44 PM) *

Twin scroll, will you be able to use a factory header? It also looks like the motor cradle will allow a fatter oil pan but with the stuff you are doing it will probably be a dry sump right?


I'm not going to be using the factory manifolds. The factory exhaust is designed to run along the right side of the motor which is where the Boxster has it's shifter cables and linkage. I will be making custom stainless steel headers that will dump into the turbo on the left side of the transaxle. I'll have some pictures up in a few days of the exhaust.

No dry sump on this car (too expensive to justify)
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precisionchassis
post Sep 2 2010, 02:33 AM
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Started on the wiring harness tonight. Here is the unmolested 2007 WRX harness ready to be "reduced" wire by wire...

(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283416430.1.jpg)
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precisionchassis
post Sep 3 2010, 07:59 PM
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I finally got the exhaust finished today. I'm pretty happy with the way it came out. I still need to add two double slip joints in between the cylinder banks, some wastegate dump supports, and a couple of O2 bungs, but other than that, it's done. This first system is only 304 SS but I made sure to carefully purge everything, and all of the welds are full penetration welds rather than the standard "automotive style" welds so it will have the best possible chance of surviving. Also, the turbo is supported by a 1/4" thick plate bracket so the actual exhaust tubing isn't holding any weight other than it's own. If the 304 doesn't survive, then I will do the second set in 321 and see how long that lasts.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565551.1.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565551.2.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.3.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.4.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.5.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.6.jpg)
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Rotary'14
post Sep 3 2010, 08:03 PM
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(IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/drooley.gif) (IMG:style_emoticons/default/drooley.gif)

That's a work of art. You do some awesome work. I love it and I don't even need it (yet).

-Robert
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charliew
post Sep 3 2010, 09:23 PM
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The welds look good. Do you think the long tubes will hurt spool? And I wonder if water from the wheel will hurt the turbo housing.
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Andyrew
post Sep 3 2010, 10:31 PM
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That is fuckin awesome...

Seriously.
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Mike Bellis
post Sep 3 2010, 11:12 PM
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QUOTE(Andyrew @ Sep 3 2010, 09:31 PM) *

That is fuckin awesome...

Seriously.


(IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/drooley.gif) (IMG:style_emoticons/default/wub.gif)
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Britain Smith
post Sep 3 2010, 11:23 PM
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That looks fantasic. Where did you get the flanges against the heads? I will be making my own custom header here soon.

-Britain
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precisionchassis
post Sep 4 2010, 09:37 AM
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QUOTE(charliew @ Sep 3 2010, 08:23 PM) *

The welds look good. Do you think the long tubes will hurt spool? And I wonder if water from the wheel will hurt the turbo housing.


I'm not worried about lag in relation to header length. THe system is a little longer than the aftermarket Subie equal length headers, but not a whole lot longer once you take into consideration the length of the up-pipe. There's really no other place for the turbo to go in the chassis anyway. Besides, it worked on the 917/30 didn't it? (IMG:style_emoticons/default/driving.gif)

(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283616097.1.jpg)

Water fron the wheel shouldn't be an issue since I will be retaining the rear wheel liners, and the fact that this car will be a track car.
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precisionchassis
post Sep 4 2010, 09:40 AM
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QUOTE(Britain Smith @ Sep 3 2010, 10:23 PM) *

That looks fantasic. Where did you get the flanges against the heads? I will be making my own custom header here soon.

-Britain



I had my water jet guy cut the flanges from some 1/2" thick 305 SS. I had him do a few sets so I have some extras if you want. Send me a PM if you are interested. When I was looking around for some for myself, I had a hard time finding any that were thick enough, or had the right 1.755" holes for the tubing to slide into.
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bryanc
post Sep 4 2010, 10:04 AM
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Sweet!!! Is that my old car? One of those tons of Boxsters with a bad motor?
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precisionchassis
post Sep 4 2010, 10:08 AM
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QUOTE(bryanc @ Sep 4 2010, 09:04 AM) *

Sweet!!! Is that my old car? One of those tons of Boxsters with a bad motor?



Hahaha, yes it is. I'm breathing new life into it. I was going to have Jim tell you about but I wasn't sure if you were a "Porsche Purist" who would be offended by seeing it with something other than a Porshce motor in it (IMG:style_emoticons/default/smile.gif)

You should update your "signature" on the status of the car (IMG:style_emoticons/default/lol-2.gif)
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bryanc
post Sep 4 2010, 10:13 AM
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QUOTE(precisionchassis @ Sep 4 2010, 09:08 AM) *

QUOTE(bryanc @ Sep 4 2010, 09:04 AM) *

Sweet!!! Is that my old car? One of those tons of Boxsters with a bad motor?



Hahaha, yes it is. I'm breathing new life into it. I was going to have Jim tell you about but I wasn't sure if you were a "Porsche Purist" who would be offended by seeing it with something other than a Porshce motor in it (IMG:style_emoticons/default/smile.gif)

You should update your "signature" on the status of the car (IMG:style_emoticons/default/lol-2.gif)


I'll update the signature. I'm certainly no purist. If my time and budget allowed, the car would have gotten something interesting done to it--I was thinking an Audi V8 though....
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Zaney
post Sep 4 2010, 09:15 PM
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QUOTE(precisionchassis @ Sep 3 2010, 06:59 PM) *

I finally got the exhaust finished today. I'm pretty happy with the way it came out. I still need to add two double slip joints in between the cylinder banks, some wastegate dump supports, and a couple of O2 bungs, but other than that, it's done. This first system is only 304 SS but I made sure to carefully purge everything, and all of the welds are full penetration welds rather than the standard "automotive style" welds so it will have the best possible chance of surviving. Also, the turbo is supported by a 1/4" thick plate bracket so the actual exhaust tubing isn't holding any weight other than it's own. If the 304 doesn't survive, then I will do the second set in 321 and see how long that lasts.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565551.1.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565551.2.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.3.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.4.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.5.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i180.photobucket.com-11979-1283565552.6.jpg)



Seeing that exhaust in front would blow a Porsche snobs mind!
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ottox914
post Sep 5 2010, 06:58 AM
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QUOTE(charliew @ Sep 3 2010, 07:23 PM) *

The welds look good. Do you think the long tubes will hurt spool? And I wonder if water from the wheel will hurt the turbo housing.



That exhaust system is just amazing. Between that and the trans adapter, hope you are making good notes because you could be making more adapters and exhaust systems...

With a properly sized turbo the tubes length should not be a problem. Check out the turbo location in my turbo project thread below. Water/turbo housing has been a non-issue as well.

Also google up STS turbo systems, they do rear mount turbos for many other cars, and while it may be a little unconventional, it can work well.
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Dr Evil
post Sep 5 2010, 08:44 AM
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I am awed by this build. One thing that I notice, though, is that your popes are really close to the gear box. Typically this can led to premature wear and failure. Is this something that you already considered and have provided for?
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roadster fan
post Sep 5 2010, 02:37 PM
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QUOTE(Dr Evil @ Sep 5 2010, 07:44 AM) *

One thing that I notice, though, is that your POPES are really close to the gear box. Typically this can led to premature wear and failure. Is this something that you already considered and have provided for?


Attached Image Attached Image

huh? I missed those guys in his pics (IMG:style_emoticons/default/smile.gif) is this like "where's waldo?" (IMG:style_emoticons/default/poke.gif)

Jim
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Dr Evil
post Sep 5 2010, 06:31 PM
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Send me your transmission!
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Blah blah, I was typing on my iPod. It is not easy (IMG:style_emoticons/default/finger.gif) (IMG:style_emoticons/default/tongue.gif)
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precisionchassis
post Sep 5 2010, 10:54 PM
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To answer your question, Yes, I do plan on heat wrapping the entire system, and adding strategic heat shields where they are needed. Also, this car will have a transmission oil cooler (as all track cars should) so I'm not really concerned.
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