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Corvette Gets Power Increase for VIR

Corvette C7.Rs get power increase for VIR…

Photo: Rick Dole/IMSA

The pair of Corvette C7.Rs will head into next weekend’s Michelin GT Challenge at Virginia International Raceway with additional power, in the latest round of Balance of Performance adjustments.

IMSA confirmed on Wednesday that the GT Le Mans championship-leading Corvettes will have a 0.5mm larger air restrictor, along with an increased refueling restrictor.

Both the BMW M6 GTLM and Ford GT, meanwhile, have been handed decreases in refueling restrictor, with the Ford also getting a three-liter reduction in fuel capacity.

Fuel adjustments have also been made to the Acura NSX GT3 in GT Daytona, with a 3-liter reduction in capacity and reduced refueling restrictor also as a result.

The Audi R8 LMS will also have a reduced refueling restrictor, while the Ferrari 488 GT3 has been given a larger one.

The Michelin GT Challenge is set for Aug. 25-27.

John Dagys is the founder and Editor-in-Chief of Sportscar365 as well as the recently launched e-racing365 Web site for electric racing. Dagys spent eight years as a motorsports correspondent for Channel, and contributes to other publications worldwide. Contact John



  1. jason

    August 16, 2017 at 3:15 pm

    Still no breaks for the Mercedes! Does IMSA want the out of the series?

    • Lex

      August 16, 2017 at 4:29 pm

      Im lost myself that car is very down on power

    • Sol Shine

      August 20, 2017 at 11:10 am

      Oh come on, surely you know it’s GM’s turn to win? Anyone that thinks this is real racing is delusional. They use BOP to give everyone a couple of wins to keep them coming back. They use BOP to make sure GM gets more series championships than anyone else. Nascar/Imsa never met a GM car it didn’t like, and while they have to let someone else win now and then, they pretty much look after Generous Motors.

      Fake racing at its finest.

      • Huginn

        August 23, 2017 at 12:51 pm

        I bet you’re singing a different tune about BoP when it’s your rooting interest that’s winning. Then all is right in the world.

  2. JimBobJoe

    August 16, 2017 at 3:19 pm

    Aug 25-27**

  3. Amlv20

    August 16, 2017 at 3:44 pm

    Corvette to the pole and victory lane,thanks imsa

    • Joel

      August 16, 2017 at 4:08 pm

      ? Corvette has been obviously slow. They haven’t secured a pole all yr. Not sure what the issue is.

      • Kevin

        August 16, 2017 at 4:37 pm

        Corvettes have been slow the last few rounds. I think though they should left the fords and BMWs alone.

        • Bobby

          August 16, 2017 at 4:55 pm

          It was just a fueling restrictor for both and slightly less fuel capacity for the fords which was deserved after what they did a lime Rock. That’s barely going to affect them.

          • Sir Skidsalot

            August 17, 2017 at 1:27 pm

            Now that they are competitive speed wise that is true. Back when they were slow, stretching fuel was their only recourse to try and win.

        • Sol Shine

          August 20, 2017 at 11:13 am

          Chevalay is 1 point behind Ford in the Manufacturers championship, Imsa gotta fix that right fast!

      • bakkster

        August 16, 2017 at 7:10 pm

        Magnitude of the change is pretty big, though. Half a mm at one time is relatively rate. Doesn’t mean it won’t be the right change, though.

    • DEJ

      August 16, 2017 at 7:49 pm

      Yes very true !!!!

    • amlv20

      August 16, 2017 at 8:04 pm

      bop bmw,gets pole & wins twice.bop Porsche,gets pole & win.bop ford,gets pole & win.bop corvette…..

      • Sol Shine

        August 20, 2017 at 11:13 am

        Now you’re seeing it. Fake racing. Such a joke.

  4. bob

    August 16, 2017 at 3:59 pm

    well considering the blatant cheating that Mercedes got caught in Europe with the car’s rollout, perhaps IMSA is keeping them under their thumb, given they have virtually no recent history in IMSA.

  5. JEZ

    August 16, 2017 at 4:40 pm

    Where is Larry? I’m sure we need to know the displacement of the Corvette and Porsche with every GTLM BoP changes.

  6. Steven

    August 16, 2017 at 4:52 pm

    About time. Corvette looked like it was in the GTD class at Road America. They were that far off the pace from the BoP.

  7. Michael

    August 16, 2017 at 6:37 pm

    And no adjustment for the Benz… SMDH IMSA…

  8. JamieR

    August 17, 2017 at 6:07 am


    Cue the Ford Fanboys….

    • WBrowning

      August 17, 2017 at 1:31 pm

      Cue them/us how? The BoP changes make sense. The Fords got the power they’d been needing last race. That left the vettes as the only ones not able to keep up, hence a restrictor size increase.

  9. fourloko

    August 18, 2017 at 1:29 pm

    ferarri will probably be left in the dust. ill bet porsche or corvette to pole. anyone notice ford has gotten the derka award for best mpg last 3 races? 67 got it at RA despite finishing 3rd.

    • Sol Shine

      August 20, 2017 at 11:16 am

      That’s what happens when you design a totally new car from the ground up. Efficiency. Which Ford deserves a lot of credit for doing. Whereas GM just trots out the old 2 valve pushrod engine from 1957 in a RWD chassis, cheap and cheerful, and Nascar/Imsa looks after them. Racing is supposed to improve the breed, not just use same old same old stuff there Generous Motors.

      • JamieR

        August 21, 2017 at 10:28 am

        …well GTE racing is supposed to be for production cars not a prototype built from the ground up, with a tiny number of secretive, exclusive half-million road-going versions built a year later to compensate.

        If you want innovation watch Formula E.

        • Horrido

          August 23, 2017 at 11:21 am

          Formula E is exciting racing for the hard of hearing only.

      • Joel

        August 21, 2017 at 8:31 pm

        A small block v8 does have advantages over a dohc design. One being packaging. It makes good torque and power. The dohc engine has been around since 1903. The OHV engine about 1900. So they are both “old” designs. I believe Corvette won the Dekra green car award at COTA.

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