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Old 07-16-2012, 03:27 PM   #1
Jatterbu
 
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GRAND-AM Camaro GS.R Build Thread

As some of you may know, the Mitchum Motorsports #62 car was involved in a roll-over accident while qualifying at Watkins Glen a few short weeks ago. The team did an absolutely amazing job in rebuilding almost the entire car to get it ready to race the next day. They replaced the entire rear subframe with all arms, both front corners, steering rack, seat belts, port-o-power'd the roof and C-pillar back out and countless other hours of repair on the car. We were running in the 11th position with 25 minutes left when the front sway bar broke on the car and had to pit for repairs.

With that being said, the #62 chassis that was rolled over will live again to race another day, but needs lots of time in the body shop because of where the damage took place. The frame is still completely straight!! Shows how strong these cars really are. With the limited time the team had from the wreck until the race at Indy they have been building a brand new tub from the spare that was in the shop. This process started Wednesday of last week and I will continue to update with pictures of the build process.

Just after the roll-over:


Chassis being stripped:


Interior being stripped and wiring being removed:


Sitting as a completely bare chassis:


Brand new chassis beginning the build process:


Beginning to Gold Foil the Engine Bay:


Accessories Connected and Hard Lines installed:


Completing the Gold Foil:


New Interior wiring beginning:


Rear Subframe Installed:


Right Rear Corner:


Wiring Harness, ECU, ABS and Camera systems installed:


Steering Rack and pedal assembly installed:


I will update this thread as more goes into the car. We should be putting the front subframe with engine/trans and front corners in the car later today. Let me know how you guys like this brand new chassis! Feel free to ask any questions.


Joey
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Old 07-16-2012, 03:46 PM   #2
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Very... Very cool thread!
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Old 07-16-2012, 04:18 PM   #3
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One more quick update before we leave the shop for the day. This was all done in the last hour here on Monday afternoon.

Front Subframe with Clutch and corners:


Front Subframe with Trans bolted ready to go in chassis:


Front Subframe w/Engine & Trans installed:


Engine Bay bolted up, still have all accessories and wiring harness to complete:



Let me know if you guys have any questions.


Joey
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Old 07-16-2012, 04:38 PM   #4
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Is that a stock Camaro chassis? Sure looks like it...


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Old 07-16-2012, 05:26 PM   #5
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Originally Posted by ShnOmac View Post
Is that a stock Camaro chassis? Sure looks like it...
Yes they are a stock Camaro chassis. These cars compete in GRAND-AM's CTSCC class as GS cars. The Camaro's that race in Rolex such as Autohaus and Stevenson are Pratt & Miller tube frame cars with artificial Camaro bodies manufactured to fit on the chassis. Stevenson also runs a car in the GS class as well as CKS.
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Old 07-16-2012, 05:31 PM   #6
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Originally Posted by Jatterbu View Post
Yes they are a stock Camaro chassis. These cars compete in GRAND-AM's CTSCC class as GS cars. The Camaro's that race in Rolex such as Autohaus and Stevenson are Pratt & Miller tube frame cars with artificial Camaro bodies manufactured to fit on the chassis. Stevenson also runs a car in the GS class as well as CKS.
That is very cool. I had no idea that ya'll used stock chassis!
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Old 07-16-2012, 05:56 PM   #7
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That is awesome to see some behind the scenes pics. I love watching the Grand Am series races. Best of luck to you guys at Indy next weekend! If the C5Fest wasn't the following weekend, I would come up for your race on the 28th.
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Old 07-16-2012, 06:02 PM   #8
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Very cool thread guys. We really appreciate the inside scoop stuff you're showing us. With the gold foil heat shielding on the car, the build is a bit (dare I say) NASA like.

I was lucky to be with the Upstate guys at WGI a couple of weekends ago and thouroughly enjoyed the Mitchum Motorsports tour you gave us.

















Good luck at Indy!:party0038:
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Old 07-16-2012, 09:23 PM   #9
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Good luck at Indy!:party0038:
Great pic's!


I am seriously loving this thread.
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Old 07-16-2012, 09:32 PM   #10
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Quote:
Originally Posted by Jatterbu View Post

With that being said, the #62 chassis that was rolled over will live again to race another day, but needs lots of time in the body shop because of where the damage took place. The frame is still completely straight!! Shows how strong these cars really are.


Joey

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Old 07-16-2012, 10:07 PM   #11
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Look closely at the rear swaybar, front endlinks, suspension struts and shocks and also the use the best setup for a strut brace one that is linked to the firewall. Even their cradle bushings look different.
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Old 07-17-2012, 06:44 AM   #12
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Cool thread Joey. It was nice to meet you at the track. Glad to see Angelina will be new once again. Did you guys test her at Indy? I'll be down there this weekend and hopefully visit the shop on Monday. Tell Trevor I'll give him a call.
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Old 07-17-2012, 08:21 AM   #13
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Originally Posted by mclark10 View Post
Cool thread Joey. It was nice to meet you at the track. Glad to see Angelina will be new once again. Did you guys test her at Indy? I'll be down there this weekend and hopefully visit the shop on Monday. Tell Trevor I'll give him a call.

The Mitchum Motorsports team did test both the #6 and the #62 cars at Indy and both ran great. Sorry to disappoint you guys but I was picked up by Roush in between the Watkins Glen race and the Indy test so I'll be the Roush/Starstruck Entertainment BOSS 302R for the rest of the season. Don't worry too much though, I still work here at the Mitchum shop and will be bringing you guys all the updates and news with these Camaro's.

Also look forward to the next few months as here at Mitchum we are expanding and will be offering street car work, parts and even some custom made race parts for your street and track day cars!


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Old 07-17-2012, 08:35 AM   #14
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Thanks for the photos, I like racing series that work with factory issued products. I don't recognize the brand of coilover being used. Can you tell us who makes the coilover for the Mitchum Camaro. How much does the car weight?
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Old 07-17-2012, 09:10 AM   #15
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Originally Posted by Cuda7050 View Post
Thanks for the photos, I like racing series that work with factory issued products. I don't recognize the brand of coilover being used. Can you tell us who makes the coilover for the Mitchum Camaro. How much does the car weight?

In the GRAND-AM CTSCC series there are only 2 options for competitors to use for shocks, Koni and AST. All of the Mitchum cars run the AST shocks, however springs are unrestricted and can be changed to any height and/or rate. Through testing the two different branded shocks are almost identical in speed but driver tuning was preferred on the AST shocks.

The Camaro's that compete in the GS class have to weigh 3300lbs after the race, this means no fuel and no driver weight added. With a fuel capacity of over 18 gallons and a driver that weighs roughly 170lbs, the cars can easily reach 3600lbs when racing.


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Old 07-17-2012, 09:13 AM   #16
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Have some more updates as of this morning at 10am.

Interior Dash installed with Motec system:


Fuel Cell install has begun:
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Old 07-17-2012, 09:59 AM   #17
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The boys will be finishing up in some other area's of the car today and I will update one more time at the end of the day. The plan is to have the new #62 up and running tonight and strapped down on the dyno all day Thursday to shake her down and make sure she is running 100%.

Completed dash with steering wheel, Motec, Control Panel, Radio & Electronics:
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Old 07-17-2012, 10:12 AM   #18
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Thanks for all the cool pics and info. I'm always amazed at how accessible you guys are, at the track, and now here on this forum
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Old 07-17-2012, 03:44 PM   #19
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Some final pictures from today. They are adding water to the system right now and will have the fuel system done by the end of the day. The #62 should be alive again by tomorrow morning and will post a video of it starting up and running here in the shop for you guys.

Dry Sump Oil System tank mounted and hoses complete:


Interior Dry Dump, Fire Suppression System and Cool Shirt box:


Nearly completed Engine Bay with all lines/hoses installed and water being added:



Let me know if you guys have any questions!


Joey
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Old 07-17-2012, 07:07 PM   #20
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Thanks so much for sharing these with your racefans, Joey Atterbury!!!

Kick some a$$ at Indy!!!
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Old 07-17-2012, 11:37 PM   #21
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Kick some a$$ at Indy!!!
Hmmmm I'm torn by your statement now that he drives a Mustang....










I kid I kid... Good Luck Joey!
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Old 07-18-2012, 01:59 AM   #22
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Nice thread. I try to watch the Continental Tire series as much as I can. Other than the dry sump, is that a stock longblock LS3? Is the transmission a stock Tremec 6060? What kind of differential do you use?
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Old 07-18-2012, 06:42 AM   #23
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thanks so much for sharing the pics as it all comes together. Loving it!!! Cant wait to see it on the track here at Indy!
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Old 07-18-2012, 07:47 AM   #24
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Nice thread. I try to watch the Continental Tire series as much as I can. Other than the dry sump, is that a stock longblock LS3? Is the transmission a stock Tremec 6060? What kind of differential do you use?
IIRC, Grand Am allows the Camaro's to run forged pistons after a lot of failures in 2010 (we toasted an engine on the main straight in New Jersey). You can also have the engine blueprinted too. But for the most part, they are stock engines.
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Old 07-18-2012, 08:19 AM   #25
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Thanks for all the compliments! I will keep you guys updated as she starts up and the rest of the car is finished.

Quote:
Originally Posted by LimaCharlie View Post
Nice thread. I try to watch the Continental Tire series as much as I can. Other than the dry sump, is that a stock longblock LS3? Is the transmission a stock Tremec 6060? What kind of differential do you use?
For the most part yes it is a 'stock' LS3. We are allowed forged pistons in replacement of the OEM units but they must be stock compression. Really there is no HP benefit here, just a more durable piece. We are also allowed to replace some other internal parts that are meant to deal with the higher temps and stress of racing but provide no real HP gains. All of our GRAND-AM engines are built by CRD in Charlotte and that is where all the Camaro teams have their's built as well. We even still have to use a completely stock intake with box and stock exhaust manifolds. They still make the Camaro run a restrictor in the Throttle Body as well.

The Camaro has a choice of two different transmissions for 2012. We have been running the last 2 years on the stock Tremec box that has been pulled apart and gone through to maximize efficiency, still maintains all stock gearing. We also have the option of a GM prototype transmission that is simply a taller 1st, 2nd, and 3rd gear but keeps the same 4th, 5th, and 6th of the stock Tremec unit. We tend to use the new trans on tracks that require very slow speed corners and need a taller gear, 2nd, to prevent wheel-spin exiting the slow corners.


Joey
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