posted on March 23, 2011 03:25
A Quick Look at Stephan Verdier's 2011 Rallycross Subaru STi
By Mike Kojima
We spend a lot of time at Costa Gialamas's shop GTI Tech Innovations. Costa is Dai Yoshihara's Time Attack crew chief, Matt Powers Crew Chief and is also Stephan Verdier's Crew Chief. Costa is also one of the fabricators that MotoIQ uses on our various projects including some fab work on refitting the Dog II.
We have been around while Costa has been hard at work building Stephan Verdier's Rallycross Subaru STi over the past few months and we thought that it would be cool to share some of the build details with you. Look for a full feature on this car later.
Stephan has been known for his Formula D antics drifting this STi for the last two years. What people don't know about Stephan is that he is an accomplished road racer and rally driver as well. Stephan is sitting out this Formula D season to participate in the new to the USA sport of Rallycross. Rallycross is sort of like Supercross for cars. You might have seen this on the X Games, in fact you might have see Stephan do pretty well at the X Games.
Like Rhys Millen and Tanner Foust, Stephan is going to focus on Rallycross this year hoping it becomes the next big thing in Motorsports. We hope it does as well!
|Like a drift car, the world of Ralllycross is a rough and tumble motorsport with a lot of anticipated contact. Costa built this bash bar to protect the intercooler and heat exchangers from damage. Like a drift car it's designed to be easily removable and repairable in the event of a crash. The car should be able to shrug off some significant impacts. The tubular front subframe also gives more tire cornering clearance and is lighter than the stock stamped front frame rails, core support and fender aprons.
|The Crawford Performance EJ25 motor is probably bored, sleeved and stroked to 2.7 liters or so. Sorry I didn't get the specifics but the engine probably puts out around 550 whp. I think the turbocharger is going to be a Garrett GT35.
|A sturdy thick aluminum skidplate protects the engine's sump from Yumps. There are skidplates protecting most of the car's bottom. Most of the drivetrain including the axles are protected. The skidplates also protect from rocks thrown up from spinning tires which can cause significant damage to the car's bottom as well.
|Costa stripped the car down to a bare unibody, had the unibody acid dipped to remove paint and sound deadening, completed the major fabrication and finally had the entire unibody powdercoated white. It looks pretty amazing. Check out the gold kapton tape preventing heat transfer to the car's interior. Kapton is an aerospace heat reflecting material used primarily on spacecraft and race cars!
Wednesday, March 23, 2011 1:46 PM
What is the name for the Gold heat shield tape I see in a lot of builds here?
Is it expensive?
Wednesday, March 23, 2011 2:07 PM
DEI has it. http://www.designengineering.com/catalog/design-engineering-inc/heat-sound-barrier
Wednesday, March 23, 2011 3:49 PM
I'm a huge Tanner and Rhys fan but I hope Stephan brings a little grassroots to their high-dollar, unpurchasable hatches! This series looks to be pretty exciting for sure. We have to wait until 'The Revolution' aires April 17th for those of us who can't make it down to Irwindale this weekend :(
Wednesday, March 23, 2011 3:54 PM
i approve of more spectator-friendly motorsports.
i like that the cars race in the same circuit together.
Wednesday, March 23, 2011 3:59 PM
Typical for FIA style roll cages it doesn't have a moan hoop. If anyone noticed...
Wednesday, March 23, 2011 4:40 PM
The dash looks more like an AIM unit rather than a Motec ADL/SDL.
Wednesday, March 23, 2011 5:00 PM
I think you are right!
Wednesday, March 23, 2011 11:22 PM
Those Teins look like the type Group N
not cheap at over 11k a set
Wednesday, March 23, 2011 11:32 PM
as for the cage, I would like to think the main hoop is there, jsut that they have angled it backwards and then used the B-pillar bar to form a 'Y' to spread the load more evenly. this chassis is the most extreme i've seen them in, the GRB subaru uses a conventional hoop.
Custom Cages's website is like porn for me.
Wednesday, March 30, 2011 5:56 PM
I think this is the first car on MotoIQ to not feature KW v3 suspension. =)
How does Tein WRC compare with KW? I'm guessing high dollar suspension systems are all comparable, with just slight differences such as rebuildability and the ease of custom valving.
Thursday, March 31, 2011 11:23 AM
I don't know how the KW rally shocks work but KW stuff seems to always work well. The Teins looked to be working well at the event.
We featured cars with Motons, Penkse and Teins before.
There is a reason why KW is taking over the higher end of the market, lots of different applications and their stuff works really well.
Thursday, March 31, 2011 11:58 PM
"Rally cages seem to be more optimized for rollover and chassis stiffness than side impact. "
Actually, they're optimized for side impacts with trees rather than cars. Big, blunt, relatively soft cars spread their load across much more of the cage. Tree impacts are basically a point load. A road-race style door bar that sticks out into the door will buckle at that point load and fold in. A straight door bar, like a rally car's X-bar, will be loaded in tension, so it will fare better.
Seems like rallycross cars would actually do better with road race door bars, since there are no trees, but I guess the rally cages are the tradition...
Friday, April 01, 2011 7:57 AM
Love the car it looks great!
That roof vent looks to be the same used in a UPS style truck. I used to drive for Cintas, and those were in those big box trucks.
Tuesday, June 14, 2011 12:45 PM
Dave is spot on with the side impact design critique. However when you branch out to BTCC (where this main style of cage originated) and FIA sanctioned touring car classes, there was a decent spread of years where the cages started to look like this, modeled after the Audi A4 of the time. The 'Y' B-pillar bracing was done for load pathing but not for downward forces. It was used to transmit load to opposing A and C pillars to gain rigidity.
As for a year, it was 96 and I've found a pic.
You can see the triangulated upper corner (though gusseted) at the top of the A-pillar, the 'Y' B-pillar/main hoop, etc. They of course only braced for a roll over directly over the drivers head, as most racing regs (all that I can think of but Time Attack) in the US won't allow.
So to call this a rally cage because of it's load pathing or cage design, isn't really correct. It's more that it's design lends to being a good rally cage, and a knock off of the cage used by Prodrive for the GD chassis. Main differences are the lack of diff mounting and the harness bar section.
Tuesday, June 14, 2011 12:48 PM
I did however fail to mention the part about the FIA regs and more modern touring cars with straight bars for side impacts; they use honeycomb and/or foams for side impact obsorbtion and to increase surface area of the impact.
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