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C6 Grand Sport FAQ
Select from the following links to get answers to the most Frequently Asked Questions about the 2010+ C6 Grand Sport Corvettes. Visit the GSR Members Only section for detailed Tech Tips.
Do YOU have suggestions for a good FAQ to add to this page? If so, please email them to info@grandsportregistry.com. Your input will help make our FAQ more informative. Thanks!
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How many C6 Grand Sports (2010-2013) have been built?
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How can you identify a genuine C6 Grand Sport Corvette?
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I own a C6 Grand Sport Corvette. Where can I find my GS "number?"
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I need touch up paint for my C6 Grand Sport. Where can I find it?
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How can I get a copy of the original Window Sticker and Build Sheet?
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I'm looking for a reliable auto transport company to ship my pride and joy. Any recommendations?
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How do I calculate the effects on MPH and RPM if I should change my rear axle ratio or tire sizes?
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What is the NPP Dual Mode Exhaust Option and how does it work?
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How fast/quick/etc is my C6 Grand Sport compared to other Corvettes from 1996 to 2014?
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A warning light on my C6 GS has just come on. What is the first thing I should do?
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How do I isolate groaning or popping sounds coming from my C6 coupe's removable roof panel?
SEND US YOUR BEST C6 GS SPECIFIC FAQ'S TO BE ADDED.
1. Q: How many C6 Grand Sports (2010-2013) have been built?
A:
- 2010 - 3707 GS Coupes, 2335 GS Convertibles (6042 total GS)
- 2011 - 5212 GS Coupes, 2782 GS Convertibles (7994 total GS)
- 2012 - 5056 GS Coupes, 2268 GS Convertibles (7324 total GS)
- 2013 - 4908 GS Coupes, 1736 GS Convertibles (6042 total GS)
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Total C6 - 18,883 GS Coupes, 9121 GS Convertible (28,004 total C6 GS)
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2. Q: How can you identify a genuine C6 Grand Sport Corvette?
A: As most everyone here knows, identifying a genuine 1996 Grand Sport Corvette is fairly easy, thanks to its blue and white paint scheme and more importantly, a unique VIN sequence, distinct from regular production Corvettes of that year. The 12th digit of the VIN must be a "6" followed by the production number ranging from 00001 to 01000.
But how do you identify a genuine C6 Grand Sport? Sure, the car comes with unique body panels and trim items, but those can be installed on any C6 Corvette and unlike the 96, the C6 GS does not have a unique VIN sequence and can be had in multiple colors. But after some diligent research, the GSR has found that you CAN identify a genuine C6 GS by the 5th character in the VIN. Unlike the '96, there's a mess of possible variations. Here are the VIN 5th character variants current as of 2013:
- A - STANDARD 1LT (MANUAL)
- B - PREFERRED 2LT (MANUAL)
- C - PREMIUM 3LT (MANUAL)
- D - CUSTOM 4LT (MANUAL)
- E - STANDARD 1LT (AUTO)
- F - PREFERRED 2LT (AUTO)
- G - PREMIUM 3LT (AUTO)
- H - CUSTOM 4LT (AUTO)
- J - Z06 STANDARD 1LZ (MANUAL)
- K - Z06 PREMIUM 2LZ (MANUAL)
- L - Z06 CUSTOM 3LZ (MANUAL)
- M - ZR1 STANDARD 1ZR (MANUAL)
- N - ZR1 CUSTOM 3ZR (MANUAL)
- P - GRAND SPORT 1LT (MANUAL)
- R - GRAND SPORT 2LT (MANUAL)
- S - GRAND SPORT 3LT (MANUAL)
- T - GRAND SPORT 4LT (MANUAL)
- U - GRAND SPORT 1LT (AUTO)
- V - GRAND SPORT 2LT (AUTO)
- W - GRAND SPORT 3LT (AUTO)
- X - GRAND SPORT 4LT (AUTO)
- 3 - GRAND SPORT 2013 60TH ANNIV (MANUAL)
- 4 - GRAND SPORT 2013 60TH ANNIV (AUTO)
- 9 - EXPORT ONLY
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3. Q: I own a C6 Grand Sport Corvette. Where can I find my GS number?
A: 1996 Grand Sport Corvettes have a unique VIN sequence number, ranging from 00001 to 01000, for the 1,000 GS's built in that year, the only year of production. The GSR and most GS owners therefore commonly refer to these cars by its individual GS number, usually by just the last 3 digits. Unlike the C4 Grand Sport, the 2010-2013 C6 Grand Sports do not have a unique VIN sequence number because C6 Grand Sport VINs are mixed in with regular production C6 Corvettes. Not to be outdone, however, some owners identify their C6 Grand Sports by year and last 5 digits of their VIN, e.g., 10GS08624.
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4. Q: I need touch up paint for my C6 Grand Sport. Where can I find it?
A: Correctly matching touch-up paint for all factory GM colors may be ordered from our GSR approved vendor at:
Click HERE to order GS Touch-Up Paint
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5. Q: How can I get a copy of the original Window Sticker and Build Sheet?
Duplicate window stickers and build sheets may be ordered from the National Corvette Museum at www.corvettemuseum.com. NCM Members get a discount. You ARE a NCM member, right? ;-)
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6. Q: I'm looking for a reliable auto transport company to ship my pride and joy. Any recommendations?
Based on the experience of GSR Members, we can recommend the services of the following highly reliable and professional auto transport companies:
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7. Q: How do I calculate the effects on MPH and RPM if I should change my rear axle ratio or tire sizes?
Try using this handy online calculator at http://www.angelfire.com/fl/procrastination/rear.html.
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8. Q: What is the NPP Dual Mode Exhaust Option and how does it work??
NPP is the Regular Production Option (RPO) code for the Dual Mode Exhaust Option first offered to non-Z06 Corvettes in 2008 as an $1195 option. LS3 engines equipped with NPP get a bump in horsepower rating from 430 to 436. Modeled after the exhaust on the Z06, the exhaust uses a butterfly valve over one of the exhaust exit pipes (two total, one per muffler) to vary the exhaust output. It works similar to exhaust cut-outs popular on the street rods.
The exhaust control is operated by engine vacuum pressure. The system is tied to the pcm and monitors rpm and throttle position to measure "driver intent". Under normal circumstances the exhaust valve is closed and it routes the exhaust gas out of the other pipe after it passes through the baffle chamber of the exhaust. In this case it is quieter. If the driver accelerates hard the valves will open at 2,800 rpm as long as the driver is above 80% throttle. Between 30% and 80% throttle the exhaust will open during acceleration at 3,500 rpm.
The valves will be open for the first two seconds that the car is started. It requires time for the vacuum pressure to build to close the valves. After that The operation of the NPP is normally closed, open on demand. Have someone stand behind the car and bring up the RPM to 3,500 and you should see the valves open. The butterfly operation is tied to the throttle position sensor and the RPM. It uses the throttle position to determine driver intent.
Under normal operation the valves work as follows:
- Below 30% throttle and 3,500 rpm the valves are closed
- Above 30% throttle and 3,500 rpm the valves will open
- Between 30% throttle and 80% throttle and above 3,500 rpm the valves are open
- Above 80% throttle and above 2,800 rpm the valves are open
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9. Q: How fast/quick/etc is my C6 Grand Sport compared to other Corvettes from 1996 to 2014?
This question was aptly addressed in this online article published by Motor Trend in July 2013. Read the article here.
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10. Q: A warning light on my C6 GS has just come on. What is the first thing I should do?
If you are an OnStar subscriber, press the On Star button on your rear view mirror and ask them to run a diagnostic on your car. Chances are they will be able to give you the error code and share some insight into the problem.
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10. Q: How do I isolate groaning or popping sounds coming from my C6 coupe's removable roof panel?
GSR Member Jim Weber suggests the following:
- To eliminate the clicking or popping noises emanating from the C6 removable top:
- Torque all four locating pins on the removable top, 2 on the front and 2 on the rear, to 16 ft/lbs.
- Clean all weatherstrip areas with denatured alcohol and apply weatherstrip lubricant (GM P/N 3634770) to all weatherstrip areas on the removable roof panel and along the leading edge of the halo bar where it makes contact with the removable roof.
- Apply a skim coat of dielectric silicone grease (GM P/N 12345579) to the 4 front and rear locating pins and the 3 latches, 2 on the front and 1 in the rear.
Note: GSR Member James Shoop suggests a less expensive alternative to the GM grease is the small packets of silicone grease used for the installation of automotive light bulbs which you can usually find at any automotive store. Alternatively,the silicone grease used for swimming pool pump filter gaskets may also be substituted but use it sparingly... a little dab will do ya.
Click here for more information on Noises Coming from C6 Removable Roof Panel.
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