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

kcpaz · 06-26-2012, 11:26 PM

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...

* Registered users of the site do not see these ads.

kcpaz · 06-26-2012, 11:28 PM

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.

scubynoob · 06-27-2012, 02:52 AM

Will it still be turbocharged?

CatfaceType-R · 06-27-2012, 08:46 AM

subscribed

kcpaz · 06-27-2012, 12:37 PM

Quote:

Originally Posted by scubynoob

Will it still be turbocharged?

Yes, using the VF36

turboterror99 · 06-27-2012, 02:24 PM

Cool project build. I'm in for more progress pics!

RallyColtTurbo · 06-27-2012, 02:34 PM

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

Edit: can't read.

wtyree · 06-27-2012, 03:07 PM

Subscribed.

Kennan04 · 06-27-2012, 03:11 PM

that is nasty, howd you mate the porsche tranny?

kcpaz · 06-27-2012, 05:13 PM

Quote:

Originally Posted by Kennan04

that is nasty, howd you mate the porsche tranny?

We make an adapter kit.

scubynoob · 06-27-2012, 09:30 PM

Gonna be a quick one. Any videos of when it was 'busa powered?

RonW · 06-28-2012, 12:55 AM

looking great! can't wait to see more

amroof · 06-28-2012, 11:17 AM

kent you are nutz! this thing is gonna be sick! awesome work so far

Jaxx · 07-01-2012, 09:02 AM

what is the weight difference between the busa drive train and the 207/g86

sburck · 07-08-2012, 10:23 PM

Quote:

Originally Posted by Jaxx

what is the weight difference between the busa drive train and the 207/g86

+1

???

kcpaz · 07-08-2012, 10:52 PM

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.

fan boy · 07-09-2012, 12:42 AM

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?

lukeskywrx · 07-09-2012, 01:01 AM

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.

kcpaz · 07-09-2012, 01:29 AM

Quote:

Originally Posted by fan boy

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.

kcpaz · 07-24-2012, 03:38 AM

Some updates...

RSti_Spyder · 07-24-2012, 09:54 PM

Very nice fab work! Should be a fine ride, now to make it street legal...

PHATsuby · 07-24-2012, 09:57 PM

Yea sweet work as usual, keep it up!

Ben

sense of nature · 07-25-2012, 04:31 PM

Droool... sweet

BlueSTI4Me · 07-25-2012, 05:30 PM

Nice, very nice.

kcpaz · 08-15-2012, 12:13 AM

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.

06-26-2012, 11:26 PM	#1
kcpaz Scooby Newbie Member#: 194611 Join Date: Nov 2008 Location: Gilbert Arizona Vehicle: 1998 Legacy GT Mexico Blue (not red)	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... * Registered users of the site do not see these ads.

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06-26-2012, 11:28 PM	#2
kcpaz Scooby Newbie Member#: 194611 Join Date: Nov 2008 Location: Gilbert Arizona Vehicle: 1998 Legacy GT Mexico Blue (not red)	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.

06-27-2012, 02:52 AM	#3
scubynoob Scooby Newbie Member#: 276157 Join Date: Mar 2011 Chapter/Region: SCIC Location: North County Vehicle: 2006 WRX sedan Silver	Will it still be turbocharged?

06-27-2012, 08:46 AM	#4
CatfaceType-R NASIOC Supporter Member#: 81102 Join Date: Feb 2005 Chapter/Region: MWSOC Location: busy cat	subscribed

06-27-2012, 02:24 PM	#6
turboterror99 Scooby Newbie Member#: 270910 Join Date: Jan 2011 Chapter/Region: South East Location: Saraland, Al Vehicle: 2006 WRX Tr WRB	Cool project build. I'm in for more progress pics!

06-27-2012, 02:34 PM	#7
RallyColtTurbo Scooby Specialist Member#: 16819 Join Date: Mar 2002 Chapter/Region: SCIC Location: Lake Elsinore, CA Vehicle: 2002 MBP WRX, '98 OB Three Gen 1 Legacy Turbos	Looks good so far. The cars gonna have a different feel for sure. Edit: can't read.

06-27-2012, 03:07 PM	#8
wtyree Scooby Newbie Member#: 29879 Join Date: Nov 2002 Chapter/Region: TXIC Location: Friendswood, TX Vehicle: 2002 WRX Wagon Silver	Subscribed.

06-27-2012, 03:11 PM	#9
Kennan04 Scooby Newbie Member#: 268525 Join Date: Dec 2010 Location: Texas Vehicle: 1993 Chevy Cavalier Red w/ Yellow flames	that is nasty, howd you mate the porsche tranny?

06-27-2012, 09:30 PM	#11
scubynoob Scooby Newbie Member#: 276157 Join Date: Mar 2011 Chapter/Region: SCIC Location: North County Vehicle: 2006 WRX sedan Silver	Gonna be a quick one. Any videos of when it was 'busa powered?

06-28-2012, 12:55 AM	#12
RonW Scooby Newbie Member#: 103663 Join Date: Dec 2005 Location: S.F Bay Area Vehicle: 1968 Porsche 912 STi v8 Spec-C conversion	looking great! can't wait to see more

06-28-2012, 11:17 AM	#13
amroof Scooby Specialist Member#: 211224 Join Date: May 2009 Chapter/Region: RMIC Location: Aurora, CO Vehicle: 2005 Mystical UniCorn FXTi	kent you are nutz! this thing is gonna be sick! awesome work so far

07-01-2012, 09:02 AM	#14
Jaxx NASIOC Supporter Member#: 177 Join Date: Aug 1999 Chapter/Region: NWIC Location: Boise,Idaho,USA Vehicle: The 93 Imp W/EJ20K flat black	what is the weight difference between the busa drive train and the 207/g86

07-08-2012, 10:52 PM	#16
kcpaz Scooby Newbie Member#: 194611 Join Date: Nov 2008 Location: Gilbert Arizona Vehicle: 1998 Legacy GT Mexico Blue (not red)	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.

07-09-2012, 12:42 AM	#17
fan boy Scooby Newbie Member#: 241243 Join Date: Mar 2010 Chapter/Region: Tri-State Location: north jersey Vehicle: 1512 land chariot gold	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?

07-09-2012, 01:01 AM	#18
lukeskywrx Scooby Specialist Member#: 59837 Join Date: Apr 2004 Chapter/Region: SWIC Location: Arizona Vehicle: 2004 Spec-C Type RA What MAF? -Speed Density!	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.

07-24-2012, 03:38 AM	#20
kcpaz Scooby Newbie Member#: 194611 Join Date: Nov 2008 Location: Gilbert Arizona Vehicle: 1998 Legacy GT Mexico Blue (not red)	Some updates...

07-24-2012, 09:54 PM	#21
RSti_Spyder Scooby Newbie Member#: 120907 Join Date: Jul 2006 Chapter/Region: SWIC Location: One and a Half Miles up... Vehicle: 2012 Meyers Manx #85 1400 Lb 930 Trans 04 STi	Very nice fab work! Should be a fine ride, now to make it street legal...

07-24-2012, 09:57 PM	#22
PHATsuby Scooby Guru Member#: 13617 Join Date: Dec 2001 Chapter/Region: MWSOC Location: MN Vehicle: 2001 Legacy GT back to stock is a project too	Yea sweet work as usual, keep it up! Ben

07-25-2012, 04:31 PM	#23
sense of nature Scooby Guru Member#: 112759 Join Date: Apr 2006 Chapter/Region: MWSOC Location: In the V hole! Vehicle: 02 Srp STi... R ur Boltz to long????	Droool... sweet

07-25-2012, 05:30 PM	#24
BlueSTI4Me Scooby Specialist Member#: 34361 Join Date: Mar 2003 Chapter/Region: MWSOC Location: MI Vehicle: 04.7 STI Got2boostit2 "Q" Rack	Nice, very nice.

08-15-2012, 12:13 AM	#25
kcpaz Scooby Newbie Member#: 194611 Join Date: Nov 2008 Location: Gilbert Arizona Vehicle: 1998 Legacy GT Mexico Blue (not red)	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.