Rolex - GXP.R Info
06-24-2007, 12:28 PM
#1
Team Owner
Thread Starter
Rolex - GXP.R Info
I was watching Rolex today on Speed. One of the GXP.R's came in for a pit stop. I assumed they were FWD.
Car took off, spun the rear tires and scooted over a bit. I thought these were production modified?
Car took off, spun the rear tires and scooted over a bit. I thought these were production modified?
06-24-2007, 01:12 PM
#3
Team Owner
Thread Starter
Did not know that. Are they built to production car dimensions?
There are Mustangs, GTO's, Porsches, Nissan 350Z, all seem unique wheel bases.
There are Mustangs, GTO's, Porsches, Nissan 350Z, all seem unique wheel bases.
06-24-2007, 03:55 PM
#4
Le Mans Master
http://www.pontiac.com/divisional/ne...?pageSection=4
Built to the specifications of the Grand American GT class, the GXP.R features a rear-drive layout and a racing version of the LS2 V-8 engine that produces approximately 450 horsepower (335 kW). It is based on the same Gen IV V-8 engine design as found in the production Grand Prix GXP. The production G6 GXP is powered by a sophisticated, DOHC 3.6L V-6 with variable valve timing that produces approximately 252 horsepower (188 kW).
The GXP.R’s bodywork retains the silhouette of a production G6 GXP, but lightweight, carbon-fiber replica panels are used throughout to reduce overall mass. The stock window glass also is replaced with lighter, shatter-resistant polycarbonate pieces. The body panels are attached to a custom tube-frame chassis, with the front and rear fenders flared to cover the wide, 18-inch wheels and class-spec Hoosier racing tires. Also, a huge rear wing that provides stabilizing downforce is tied into the chassis. It’s not a production-model wing, but the G6 GXP street car has its own distinctive rear spoiler.
The GXP.R’s bodywork retains the silhouette of a production G6 GXP, but lightweight, carbon-fiber replica panels are used throughout to reduce overall mass. The stock window glass also is replaced with lighter, shatter-resistant polycarbonate pieces. The body panels are attached to a custom tube-frame chassis, with the front and rear fenders flared to cover the wide, 18-inch wheels and class-spec Hoosier racing tires. Also, a huge rear wing that provides stabilizing downforce is tied into the chassis. It’s not a production-model wing, but the G6 GXP street car has its own distinctive rear spoiler.
06-24-2007, 04:23 PM
#5
Le Mans Master
I seem to recall remarks to the effect that an early GXP.R was
built by repaneling a former GTO.R.
SPEED World Challenge Forum
LS1GTO Forum
.
built by repaneling a former GTO.R.
SPEED World Challenge Forum
Originally Posted by a4cosmo
Lawson Aschenbach is driving in the Rolex 24 in the Racer's Edge Pontiac
GXP-R. If you don't know, that is the PCM GTO-R built by and rebodied
by Pratt & Miller.
GXP-R. If you don't know, that is the PCM GTO-R built by and rebodied
by Pratt & Miller.
Originally Posted by Harpo
As far as I know, it may have been rebodied as a GXP.R and run by
The Racer's Edge team. No idea what happened to the Banner Racing GTO.R.
The Racer's Edge team. No idea what happened to the Banner Racing GTO.R.
06-24-2007, 06:39 PM
#6
Team Owner
Thread Starter
So all of the cars are custom builts with production bodies?
Reason I ask is there any rules governing how close to the original layout they need to be?
The Porsche running had a rear engine, front gas tank and looked to be a full bodied original car. Same with the RX8 running a rotary motor. The Mustang also seemed to be a full bodied car.
One of the comments was the RX8 was the lightest of the cars out there, if they were all tube frame custom builds wouldn't they be pretty close in weight.
Thanks for the info though, that Pontiac page was the thing I was looking for.
Reason I ask is there any rules governing how close to the original layout they need to be?
The Porsche running had a rear engine, front gas tank and looked to be a full bodied original car. Same with the RX8 running a rotary motor. The Mustang also seemed to be a full bodied car.
One of the comments was the RX8 was the lightest of the cars out there, if they were all tube frame custom builds wouldn't they be pretty close in weight.
Thanks for the info though, that Pontiac page was the thing I was looking for.
06-24-2007, 11:08 PM
#8
Melting Slicks
06-24-2007, 11:21 PM
#9
Melting Slicks
So all of the cars are custom builts with production bodies?
Reason I ask is there any rules governing how close to the original layout they need to be?
The Porsche running had a rear engine, front gas tank and looked to be a full bodied original car. Same with the RX8 running a rotary motor. The Mustang also seemed to be a full bodied car.
One of the comments was the RX8 was the lightest of the cars out there, if they were all tube frame custom builds wouldn't they be pretty close in weight.
Thanks for the info though, that Pontiac page was the thing I was looking for.
Reason I ask is there any rules governing how close to the original layout they need to be?
The Porsche running had a rear engine, front gas tank and looked to be a full bodied original car. Same with the RX8 running a rotary motor. The Mustang also seemed to be a full bodied car.
One of the comments was the RX8 was the lightest of the cars out there, if they were all tube frame custom builds wouldn't they be pretty close in weight.
Thanks for the info though, that Pontiac page was the thing I was looking for.
Rolex GT regulations allow for either production (prep 1) or tube frame (prep 2) chassis
"The GT class for 2007 will be comprised of two distinct preparation methods, all designed to have cars at a similar competition level for GT class racing.
Prep 1 Unibody GT - This category is reserved for production cars with little or no modifications. Grand American will define each car separately and specify modifications individually.
Prep 2 Semi-Tube GT – This category is for cars with modified production or tube-frame chassis. They may be front-wheel drive cars converted to rear-wheel drive or they may be cars that require physical modifications to be competitive in GT. Specified tube-frame construction is allowed. Alternative engines from the original manufacturer may be approved."
Minimum weights are asigned to each specific car type
Maxda RX8 - 2255 lbs
Porsche - 2525 lbs for a 996, 2700 lbs for a 997
Pontiac & Mustang - 2700 lbs
Rolex GT Rules
http://www.grand-am.com/CONTENT/Docs...07/GTRules.pdf
06-25-2007, 02:59 AM
#10
Melting Slicks
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http://theracesite.com/index.cfm?pag...m_article=9675
http://www.rileytech.com/
Crawford also builds tube-frame GT cars.
http://www.crawfordcomposites.com/
Blackforest Motorsports has a Prep 2 Mustang Cobra GT.
http://www.grand-am.com/News/Article.asp?ID=7291
http://www.blackforestmotorsports.com/
Grand-Am won't allow the Dodge Viper Competition Coupe or the new Mustang FR500GT to race.
Prototype Mustang tested: http://www.caranddriver.com/roadtest...g-fr500gt.html
06-25-2007, 11:45 AM
#13
Le Mans Master
From an arm-chair perspective, Mid-Ohio was entertaining to watch.
It has to be great for Pontiac to be seen mixing it up so well with the
Zuffenhausen gang. Are the organizers applying remedies aimed
at equalizing performance through the season?
I don't know what today's youth make of the Mustang, but as someone
who followed the original Trans-Am series with great interest in the
late '60's, the lone retro pony car sure had the T-A look nailed for me.
.
It has to be great for Pontiac to be seen mixing it up so well with the
Zuffenhausen gang. Are the organizers applying remedies aimed
at equalizing performance through the season?
I don't know what today's youth make of the Mustang, but as someone
who followed the original Trans-Am series with great interest in the
late '60's, the lone retro pony car sure had the T-A look nailed for me.
.
06-25-2007, 11:52 AM
#14
Le Mans Master
Curious.
The #57 & #97 Stevenson Motorsports Corvettes are identified as
'Corvette Z06' in the Make/Engine/Chassis column of Rolex car info.
The #43 Team Sahlen & #48 WTF Engineering cars are listed as
'Corvette'
.
The #57 & #97 Stevenson Motorsports Corvettes are identified as
'Corvette Z06' in the Make/Engine/Chassis column of Rolex car info.
The #43 Team Sahlen & #48 WTF Engineering cars are listed as
'Corvette'
.
06-25-2007, 12:43 PM
#15
Team Owner
Member Since: Sep 2003
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Curious.
The #57 & #97 Stevenson Motorsports Corvettes are identified as
'Corvette Z06' in the Make/Engine/Chassis column of Rolex car info.
The #43 Team Sahlen & #48 WTF Engineering cars are listed as
'Corvette'
.
The #57 & #97 Stevenson Motorsports Corvettes are identified as
'Corvette Z06' in the Make/Engine/Chassis column of Rolex car info.
The #43 Team Sahlen & #48 WTF Engineering cars are listed as
'Corvette'
.
The Sahlen corvette is a Georgian Bay chassie with a **** body.
The Stevenson Motorsprots cars are Tommy Riggen's Chassies ( jacksonville FL) with ACP - Corvette Racing Body body.
Both are tube frame cars.
GRAND AM rules will not allow the LS 7 so the engines are LS2s
06-25-2007, 01:15 PM
#16
Le Mans Master
Thanks for the clairification.
I missed how the incident developed where the Stevenson #57 (?)
Corvette wound up tight against the pit wall during one of it's stops.
It looked like the crew still managed to change at least one tire on the
driver's side.
Then there was their door problem after the stop. As the commentators
mentioned, the driver must have had a busy time trying to drive and
control the door after it wouldn't latch shut.
Do the Nonnamakers of Team Sahlen participate here on CF? I have
noted their columns in Grassroots Motor Racing and was interested to
see them add a Corvette for 2007.
.
I missed how the incident developed where the Stevenson #57 (?)
Corvette wound up tight against the pit wall during one of it's stops.
It looked like the crew still managed to change at least one tire on the
driver's side.
Then there was their door problem after the stop. As the commentators
mentioned, the driver must have had a busy time trying to drive and
control the door after it wouldn't latch shut.
Do the Nonnamakers of Team Sahlen participate here on CF? I have
noted their columns in Grassroots Motor Racing and was interested to
see them add a Corvette for 2007.
.
06-25-2007, 11:18 PM
#18
Le Mans Master
That is one might fine looking Cobra.