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Old 06-26-2012, 11:26 PM   #1
kcpaz
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Join Date: Nov 2008
Location: Gilbert Arizona
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1998 Legacy GT
Mexico Blue (not red)

Default Subaru conversion in a Radical SR3 (version 8 Spec C)

A local customer decided to ditch the problematic Hayabusa engine in his Radical SR3 for something with more power and cheaper maintiance costs. Based on the flawless performance and reliability of the EJ255 powered Boxster that we finished up a few months ago, the decision was made to go with a similar drivetrain. We are going to be using a Porsche Boxster 6 speed transaxle (G86/20) and a JDM version 8 Spec C engine.

This is what started it all...

The new engine. A JDM STI version 8 Spec-c engine.

Empty Radical "engine bay"

Naked Radical

Radical body... or maybe the most awesome race car bed ever...
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Old 06-26-2012, 11:28 PM   #2
kcpaz
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1998 Legacy GT
Mexico Blue (not red)

Default

Replaced the timing belt, tensioner, idlers, water pump, and a broken cam gear. Also installed a Cosworth engine oil pump.

Next came the Cosworth dry sump kit...



Then came engine/transaxle mounts in the chassis. Everything will still fit under the unmodified body work.




Next will be to add the structure back to the chassis in the form of removable braces and x-bracing that will clear the new engine configuration, then headers/exhaust.
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Old 06-27-2012, 02:52 AM   #3
scubynoob
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Will it still be turbocharged?
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Old 06-27-2012, 08:46 AM   #4
CatfaceType-R
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subscribed
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Old 06-27-2012, 12:37 PM   #5
kcpaz
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Mexico Blue (not red)

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Quote:
Originally Posted by scubynoob View Post
Will it still be turbocharged?
Yes, using the VF36
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Old 06-27-2012, 02:24 PM   #6
turboterror99
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WRB

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Cool project build. I'm in for more progress pics!
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Old 06-27-2012, 02:34 PM   #7
RallyColtTurbo
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Three Gen 1 Legacy Turbos

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Looks good so far. The cars gonna have a different feel for sure.

Edit: can't read.
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Old 06-27-2012, 03:07 PM   #8
wtyree
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Subscribed.
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Old 06-27-2012, 03:11 PM   #9
Kennan04
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that is nasty, howd you mate the porsche tranny?
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Old 06-27-2012, 05:13 PM   #10
kcpaz
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Quote:
Originally Posted by Kennan04 View Post
that is nasty, howd you mate the porsche tranny?
We make an adapter kit.
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Old 06-27-2012, 09:30 PM   #11
scubynoob
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Gonna be a quick one. Any videos of when it was 'busa powered?
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Old 06-28-2012, 12:55 AM   #12
RonW
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STi v8 Spec-C conversion

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looking great! can't wait to see more
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Old 06-28-2012, 11:17 AM   #13
amroof
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kent you are nutz! this thing is gonna be sick! awesome work so far
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Old 07-01-2012, 09:02 AM   #14
Jaxx
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what is the weight difference between the busa drive train and the 207/g86
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Old 07-08-2012, 10:23 PM   #15
sburck
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Quote:
Originally Posted by Jaxx View Post
what is the weight difference between the busa drive train and the 207/g86
+1

???
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Old 07-08-2012, 10:52 PM   #16
kcpaz
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Not sure. Never bothered to weigh the engine after we pulled it out, and to be honest, it doesn't really matter that much. I'm guessing maybe 100lbs but I won't know until everything is done and we can get a final weight on the entire car.
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Old 07-09-2012, 12:42 AM   #17
fan boy
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you're getting there! keep going---

also very intriguing rear suspension---does the solid strut add travel to the shock? is it to adjust spring tension? could you explain a little?
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Old 07-09-2012, 01:01 AM   #18
lukeskywrx
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2004 Spec-C Type RA
What MAF? -Speed Density!

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Great swap,

Check out the carberry SD rom for the 16bit ECU, it runs my spec-C motor amazingly well and gives you standalone ECU features without the cost.
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Old 07-09-2012, 01:29 AM   #19
kcpaz
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1998 Legacy GT
Mexico Blue (not red)

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Quote:
Originally Posted by fan boy View Post
you're getting there! keep going---

also very intriguing rear suspension---does the solid strut add travel to the shock? is it to adjust spring tension? could you explain a little?
There's a funky rear sway bar design integrated into the rocker arms that isn't shown in the pictures, but I think the main function of the rear suspension design is to make the spring rate progressive because of how much aerodynamic downforce the car makes.
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Old 07-24-2012, 03:38 AM   #20
kcpaz
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Some updates...









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Old 07-24-2012, 09:54 PM   #21
RSti_Spyder
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Very nice fab work! Should be a fine ride, now to make it street legal...
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Old 07-24-2012, 09:57 PM   #22
PHATsuby
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to stock is a project too

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Yea sweet work as usual, keep it up!

Ben
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Old 07-25-2012, 04:31 PM   #23
sense of nature
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Droool... sweet
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Old 07-25-2012, 05:30 PM   #24
BlueSTI4Me
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Nice, very nice.
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Old 08-15-2012, 12:13 AM   #25
kcpaz
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Intercooler and exhaust done. Just need to make a head shield around the exhaust exit (and cut the fiberglass back a little more) and make a mount for the exhaust off of the engine/ transaxle.






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