BlackRocket

Does anyone know the build on the C6 Corvettes that run ALMS; (looking for specifics)

- Are these original Corvette frames or totally custom tubular frames?
- Is the body a GM body or a custom fiberglass body for weight savings?
- What type of motor are they running?
- Is the transmission a racing version of the C6 ZO-6 transmission or a strictly racing transmission?
- What brand suspension are they running and are they using stock C6 A-arms?
- Any other information on their build/construction would be appreciated!


Thanks!

AU N EGL

the Race cars are built by Pratt & Miller http://prattmiller.com/

SOme basic info
GT2 HOMOLOGATION
The regulations require the Corvette C6.R race car to be based on a production vehicle. This designated vehicle then determines the specifications for homologation (acceptance and approval) of the racing version. The GT1 version of the Corvette C6.R was homologated on the production Corvette Z06. A crucial step in the design of the GT2 version of the Corvette C6.R was the selection of the Corvette ZR1 as the basis for its homologation.

Tech Specs: http://corvetteracing.com/cars/gt2-c...6r_specs.shtml

- Are these original Corvette frames or totally custom tubular frames? - Stock ZR1 frame rails

- Is the body a GM body or a custom fiberglass body for weight savings? Custom Carbon Fiber Pratt and Miller

- What type of motor are they running? LS5.5R - naturally aspirated powerplant is based on the Corvette Z06's 7.0-liter LS7 engine (which in turn was developed with the 7.0-liter race engine used in the C6.R GT1 cars), and is built with a production cast-aluminum cylinder block. destroked 5.5 liters. The reduction in displacement to meet this requirement was achieved by shortening the crankshaft stroke and reducing the cylinder bore diameter. In accordance with the regulations, the race engines have two 28.8mm diameter intake air restrictors. The LS5.5R engines are equipped with dry-sump oiling systems, CNC-ported aluminum cylinder heads with titanium intake and exhaust valves, and sequential electronic port fuel injection. The race engines use E85R ethanol racing fuel in the ALMS and E10 fuel in Le Mans.

470 hp @ 4800 rpm & 535lb ft @ 4500 rpm
http://corvetteracing.com/cars/gt2-c...6r_specs.shtml

- Is the transmission a racing version of the C6 ZO-6 transmission or a strictly racing transmission? Racing Sequential

- What brand suspension are they running and are they using stock C6 A-arms? Penske Triple adjustable Pratt & Miller Tuned suspension on custom P&M A-arms

- Any other information on their build/construction would be appreciated! ( that is TOP SECRET )

Not much of the C6R is from production ZR1

Look at the links posted above and

A few significant difference

Width (in):

ZR1 75.9"

C6R 78.6" 2.7" wider

Height (in):

ZR1 49"

C6R 45.9" 3.1 " lower

Weight (lb):

ZR1 3324

C6R 2745 579 lbs lighter


http://corvetteracing.com/

davidfarmer

here are some photos of LG's car. Everything except for part of the frame is custom. P&M cars would be similar, but with their own "special sauce"

MySR71

A few years ago, before they switched classes, Jason from Katech put some pictures from Pratt & Miller. Check them out here:

http://www.ls1tech.com/forums/multim...-r-photos.html

Keep in mind, these are of the older GT1 cars which had much different rules and were even more custom than today's cars.

davidfarmer

0Anthony @ LGMotorsports

Do a search under my name, and I did a complete build up on here of our car going back together after a crash if you want to see it in detail.

Our car started life as a brand new 2008 C6 right off the lot, actually two were purchased.

Stock frame rails were kept, windshield (per rules), tail light housings, suspension cradles, and steering column (per rules). Our car had a production block and cylinder head castings. Engine rules are not like other classes. They give you some guide lines but you can almost run anything you want. They give you a spec fuel, some parts that have to remain stock but they restrict the car based on engine size and car weight.

Our car had a full Emco transaxle and used a driveshaft. Nothing stock about it at all. I believe the Pratt cars use a transaxle as well but not sure who builds it. You can see some of that tech making it's way into the sequential that we have for sale as a drop in unit and what we use in the GrandAm car. The ALMS car was different as it has a PTO shaft on it to drive the A/C compressor.

Nothing stock about the suspension at all other than it has to be within 20mm of stock pickup points and we used a heavily modified cradle. Everything else was made.

Currently the only way to run a Corvette in ALMS would be to buy one from Pratt and Miller, or purchase our GT2 car. No other manufacturer can build a Corvette, and ours is the only non Pratt car that can run as it was already built before Pratt went to GT2......long story.

Timz06

here you go

http://www.roadandtrack.com/tests/co...e-zr1-vs.-c6.r

AU N EGL

zr1 $117,000 c6r $600,000

Painrace

To give you an idea about how costs have changed our GT-1 cars in the early 90's were about $250,000 for the rolling chassis less engine, transmission and wheels. All spares were extra.

Jim

AU N EGL

I think the GT1 C5Rs were in the $600-$700K range and the GT1 C6R were closer to Mil each

AU N EGL

How a Corvette C6.R comes to life: Autoblog tours Pratt & Miller shop

http://www.autoblog.com/2010/03/05/h...tt-and-miller/

BlackRocket

GREAT INPUT GUYS!!!

I asked for specifics and got waaay more than expected!

Thanks!