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Old 02-06-2012, 05:22 PM   #476
RonW
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nicely done! sounds mean. surprised how quite it is since i dont recall you having a muffle on in it. what track? do they have a max db for noise? i always need a day or so to shake out the cobwebs and feel comfortable. great job.
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Old 02-06-2012, 05:36 PM   #477
kcpaz
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No muffler at all and the exhaust is only 24" long past the turbo. I think the video makes it seem quieter than it really is. For some reason, the turbo whine seems to get picked up a lot by the GoPro.

The track is called Chuckwalla Valley Raceway. It's a pretty cool track, but it's literally out in the middle of nowhere.
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Old 02-06-2012, 11:10 PM   #478
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Old 02-07-2012, 08:58 AM   #479
Gixhost
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This is such an amazing build.
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Old 02-13-2012, 12:54 AM   #480
billyr2.5
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you guys it turned out awesome! WAY better than i imagined!!! Great build thread
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Old 02-13-2012, 10:06 AM   #481
Jaxx
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any data on how effective the IC placement worked out
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Old 02-13-2012, 10:52 AM   #482
kcpaz
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Quote:
Originally Posted by Jaxx View Post
any data on how effective the IC placement worked out
Nothing scientific yet. We are going to add a temp sensor to the intercooler next time we have to pull it out of the car.

The unscientific answer however is that it works VERY well. We came in from a hot-lapping session and did the ol' hillbilly, one hand on one side of the intercooler and one hand on the other and the difference was amazing.
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Old 02-28-2012, 05:49 AM   #483
914er
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GREAT!! espacially this part! SO this is the enigne which should be in a 914ten


And for anyone who was wondering if the Boxster cooling system could handle the cooling needs of the Subaru turbo engine... this is what we had to do just to get the car to run at normal operating temps. This was with a restrictor plate in place of the functioning thermostat. We are going to have to go back to a thermostat. Without any tape on the front end, the water temps never got above 125 degrees while driving.
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Old 02-28-2012, 09:41 PM   #484
SteeltownEJ
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Porscharu! Good stuff!
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Old 03-05-2012, 06:41 PM   #485
kcpaz
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Old 03-17-2012, 07:50 PM   #486
SubaruWRXtreme
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Car approaches and judging by the the exhaust tone... oohh it's Subaru coming WOW WTF that's a Porsche LOL
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Old 03-29-2012, 05:20 PM   #487
7m-gtte
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Any more updates?
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Old 03-30-2012, 01:47 PM   #488
kcpaz
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Quote:
Originally Posted by 7m-gtte View Post
Any more updates?

Working on a street version next
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Old 04-01-2012, 11:36 AM   #489
spec.B - autox
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This is a ridiculous build!

So, since no one else has asked the question... IF I were to provide you with the motor, and the chassis, how much to build one of these?

Please PM me with the details, including turn around time
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Old 04-02-2012, 11:02 PM   #490
kcpaz
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Quote:
Originally Posted by spec.B - autox View Post
This is a ridiculous build!

So, since no one else has asked the question... IF I were to provide you with the motor, and the chassis, how much to build one of these?

Please PM me with the details, including turn around time
There's no short answer to that question. If you really want to know figures beyond simple entertainment, send me an email to precisionchassis@gmail.com
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Old 06-10-2012, 07:59 PM   #491
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Great thread, wish I had half your fabrication skills!

Chris
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Old 10-02-2012, 11:57 PM   #492
kcpaz
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Quick update...

Based on the over cooling we experienced during testing, we decided to try out a new intercooler set-up. Without adding any serious complexity, or reconfiguring the front of the car, we were able to add an air to water intercooler system and get rid of the roof scoop. We will be utilizing the center radiator from the engine cooling system as a heat exchanger rather than using it for engine cooling, then just replace the air to air intercooler with a new intercooler, plumb a few water lines and add an electric pump. Basically the same components we will be using in the street cars, but with a slightly larger intercooler core. We will be testing the new set-up this weekend, but already, the benefits are a reduction in weight (up high and out back), reduction in aerodynamic drag, lower center of gravity, and better rearward visibility. We just got back from some dyno tuning and the car made 430whp and 380ft/lbs. The car now weighs 2651lbs with a half tank of fuel and an empty cool shirt cooler. There's another 20lbs that will be coming out over the coming weeks. Leakdown numbers are still right around 10% (cold) which is what they've been since the first test day.


Last edited by kcpaz; 10-03-2012 at 12:02 AM.
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Old 10-03-2012, 09:44 AM   #493
rkjunior
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This thing is awesome
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Old 01-23-2014, 03:17 PM   #494
'08STIguy
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bump for updates
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Old 01-23-2014, 04:55 PM   #495
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One of the sweeetest builds ive ever seen!!!
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Old 01-27-2014, 04:22 PM   #496
kcpaz
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I raced the green race car for a little over a season. When we switched to the air/water intercooler set-up we also bumped the horsepower up a bit and added a huge heat exchanger to the front of the car. The result was 430whp and it survived this way for a while. Ultimately though, it started lifting the heads (completely stock engine and heat bolts) so the engine came out for something new.

Fast forward a few months. The engine ended up on an engine stand so I pulled heads, installed some ARP studs and new head gaskets and slapped everything back together. Installed an A/C compressor, mechanical power steering pump and bolted the whole thing into another Boxster rolling chassis that I had sitting around. At the same time, a build on a customer's street conversion that was already underway had caught up and the two are being finished at the same time... both being street cars. Here are some pictures of the build on both cars.

The white car is the customer's car, and the silver car is my car (shop car).

The silver car will be a little different in some of it's components, but the goal is the same as far as the car's intended purpose.



GT3 front bumper

New timing belt system, water pump, welded/ported TGV's, ID1000 injectors, and secondary air injection delete.

Modified OEM Subaru wiring harness ready to be installed

Engine mocked up in chassis


Air/water intercooler in rear trunk. No goofy roof scoop needed...

Turbo and stuff...
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Old 01-27-2014, 04:23 PM   #497
kcpaz
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Here is the silver car. It's a bit of a mix of spare parts that I have been collecting.

The hard top was from another project that got a fiberglass top.


Stripped the red paint off. The plan is to run the top with a brushed aluminum finish


The silver car had a horrible "pink" colored interior...


So we ripped that out...


And installed a black interior from a 2004 Boxster S. Now it has a glove-box

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Old 01-27-2014, 04:25 PM   #498
kcpaz
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Some pictures of the exhaust and intercooler system on the white car...



















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Old 01-27-2014, 04:26 PM   #499
kcpaz
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Oil accumulators for turbo oil return


Modified AC lines for engine side


Heat reduction on white car engine bay


Modified AC lines on chassis side


Some of the powder coated parts


Rebuilt and re-coated calipers for both cars


Finished engine install on silver car.






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Old 01-27-2014, 04:28 PM   #500
kcpaz
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Engine bay for the silver car. You'll notice the custom roll bar too.


Dyno graph from silver car. This same engine/turbo package was making 430whp in our race car on 110 leaded race fuel. This graph was on Arizona's crappy 91 octane fuel. 364whp is about all the 275mm Nitto NT05 street tires can handle.


Engine installed in white car. Major differences between this car and the silver car are smaller turbo GT2871 versus GT3076, single scroll versus twin scroll, and 5 speed versus 6 speed.


White car again


Trunk on the white car. The rear carpet section will install after the car is tuned. You can see the coolant expansion tank, intercooler, intercooler water pump and catch can.




Engine bay on white car



Trunk of the silver car
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