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IMSA Sets Sebring Test BoP

IMSA sets Sebring Test Balance of Performance…

Photo: IMSA

Photo: IMSA

IMSA has set the Balance of Performance for teams running next week’s official test at Sebring, which sees a number of cars move from a Daytona-specific BoP to its standard configuration for the remainder of the WeatherTech SportsCar Championship season.

In Prototype, the Corvette DP gets a 0.3 mm larger air restrictor and 10 kg weight break, with the DeltaWing having a 10 kg weight increase and a reduction in boost across all levels.

While no weight or restrictor changes have been made to the Ligier JS P2 Honda, the Rolex 24-winning car sees a reduction top-level boost.

The Mazda Prototype, which shined in the early stages at Daytona, gets a 10 kg weight break and no adjustment to boost.

The Oreca 05 Nissan, which makes its WeatherTech Championship debut in Sebring with DragonSpeed, has yet receive weight, restrictor, fuel capacity or refueling restrictor specifications.

All P2 cars return to the standard high-downforce aero configuration after using the Le Mans-spec low downforce kits at Daytona.

Changes, meanwhile, have been made nearly across the board in the GT ranks, with both the Corvette C7.R and Ford GT in GT Le Mans getting 10 kg of additional weight, while the Porsche 911 RSR sheds 10 kg.

Additionally, the Corvette gets a 0.4 smaller air restrictor, with boost changes made to Ford (decrease) as well as the BMW M6 GTLM (increase).

In GT Daytona, the Dodge Viper GT3-R gets a 15 kg weight increase, with both the Porsche 911 GT3 R and previous-generation Audi R8 LMS ultra increased by 10 kg. The Ferrari 458 Italia GT3, meanwhile, gets a 10 kg weight reduction.

The Viper, consequently, gets a 1.0 mm larger air restrictor, with the Aston Martin V12 Vantage GT3 facing a 0.5 mm air restrictor reduction.

The BMW M6 GT3 has adjusted boost ratios (increase), while only the boost ratios for the new turbocharged Ferrari 488 GT3 have been confirmed for its configuration.

Also yet to be determined is the configuration of the Lamborghini Huracan GT3, with IMSA still evaluating the engines it impounded following last month’s Rolex 24.

IMSA has stated the adjustments have been made based on manufacturer-submitted data and its own data analysis.

Further changes are to be expected following next week’s two-day test and prior to the Twelve Hours of Sebring in March.

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. Joel

    February 18, 2016 at 5:43 pm


  2. StueyB83

    February 18, 2016 at 6:13 pm

    How do you IMSA fans keep up with the many BOP changes? How does a team stay consistent when a good result brings out a generous serving of weight plates?

    And how does Mazda get a break when the Deltawing gets pegged back? both were pretty strong in Daytona.

    • Jack

      February 18, 2016 at 7:18 pm

      Because The delta wing ran the fastest lap of the entire event. The delta wing was a mile ahead of the mazda, and the dp’s.

      • racefan101

        February 18, 2016 at 10:00 pm

        The problem is, Daytona is an one of the kind race, using a different aero package. They should wait until after Sebring to make any BOP adjustments. Sebring is more in line with the rest of the race tracks than Daytona is.

        • Doug

          February 19, 2016 at 10:35 am

          The BoP is for the Sebring TEST. Not for the race proper.

          • Kirk

            February 19, 2016 at 11:21 am

            That’s right. It’ll be changed again before the race.

        • Milton

          February 21, 2016 at 9:36 pm

          Le Mans is also a one-off hence why they have separate BoP rules for them. Sebring is what they run all season in IMSA, and could have more to do with data from Petit than anything else.

          The boost and weight adjustments are probably based on what they saw at Daytona.


    February 18, 2016 at 6:38 pm

    Corvette nerfed again for being more successful than the rest of the field.
    Gg imsa..

    • GTurner38

      February 18, 2016 at 7:10 pm

      The Corvettes are also being given a boost in the Prototype class. I understand the need for a different BoP at Daytona compared to the rest of the schedule, but that should have been set before Daytona, not in response to the results of the 24.

      • Oook

        February 18, 2016 at 8:30 pm

        No one cares about the DP class. Lol

    • Jack

      February 18, 2016 at 7:19 pm

      They had the best bop, not the best car. When will you learn.

      • Baksterr

        February 18, 2016 at 8:31 pm

        Best car=Best BoP

        • Bakkster

          February 18, 2016 at 11:17 pm

          Aww, I’m touched to be impersonated.

          • JohnRamella

            February 19, 2016 at 9:13 am

            The TenTenths trolls keep on giving.

    • Bakkster

      February 18, 2016 at 11:19 pm

      Remember, people were complaining before Daytona that the Corvette had been nerfed to the point of being uncompetitive, and we saw how that turned out…

      • JC

        February 22, 2016 at 12:36 am

        That’s just because the BOP didn’t go far enough. They’re obviously trying to finish the job now…

        /s…maybe 😉

    • Howard young

      February 19, 2016 at 12:43 am

      Even though every car in that class lead the race at some point, the crybaby losers got imsa to crack down on corvette racing. Daytona race was the best race ever and evenly divided between all cars. Imsa just hates corvettes and corvette racing. GO CORVETTE, SHOW IMSA AND ALL THE FOREIGN RACERS HOW ITS DONE EVEN WHEN SHACKLED.

  4. Chris Turner

    February 18, 2016 at 7:04 pm

    The GTD BoP seems to be the one giving IMSA the most problems. While each make of car was fairly close in lap times regardless of the team running the car at Daytona (with a couple of exceptions), the differences between types of cars was significant and these changes certainly don’t appear like they will dramatically close those gaps.

  5. Vurtt

    February 18, 2016 at 7:20 pm

    IMSA doesn’t know what to do with the super fast lambos. Should be interesting

  6. Mike S.

    February 18, 2016 at 7:35 pm

    BoP giveth and taketh. A blessing and a curse. But what can you do with the vast array of machinery which we all love its necessary. Each car has its advantages and disadvantages. North America needs an open series. Have some basic standards then set safety rules/guidelines, set sized fuel tanks and basic pit rules and requirements. Then run what you brung. Have sprint races and endurance races so that not just the fastest cars will win but the most reliable. A reliable car with mileage might beat a huge V8 over a long distance race. Ah never mind I can dream I guess.

  7. speedy

    February 18, 2016 at 8:35 pm

    If corvette racing doesn’t have the best’s,cars then why are they these only team getting more bop, getting it faster,then these other team’s and car’s?

  8. Matt

    February 18, 2016 at 10:17 pm

    How is noone else intregued by “evaluating the engines they impounded”?

    The Lambo was running down prototype cars in certain situations, the only reason those cars didnt finish 1-2-3 was questionable driving and incidents.

    • CPT

      February 18, 2016 at 10:31 pm

      they made us take the engine out of the 21 car after it crashed out. clearly its way to fast

      • morningview66

        February 19, 2016 at 4:34 am

        It makes me wonder what SRO did about the Lambos last year. They certainly blew everyone away at the first Blancpain race at Monza, then disqualified, then reinstaed later.

        But after that they didn’t seem as competative for the rest of hte season.

  9. Joe

    February 18, 2016 at 11:16 pm

    They should wait to BoP the GTD/GTLM cars until after the test, let the teams show what they have got. Doesn’t IMSA get all the telemetry data following the event? Daytona and Sebring are two totally different tracks. At Daytona you take as much downforce off as you can for straight line speed, especially when the new GTD/GTLM cars have enough mechanical grip sans aero for the infield. Sebring is an entirely different animal, far more technical requiring much more downforce. IMSA needs to sit on their hands for once and let the test dictate the BoP for a change.

    • Bakkster

      February 18, 2016 at 11:20 pm

      Nah, run the test with the best guess for the race. It means closer data to what you expect to race with, and a smaller change to make after the test (meaning less chance to get it wrong).

      • juneracer

        February 19, 2016 at 9:48 am

        agree, IMSA ha to iterate. there wont be any Corvette GTLM data as they will no longer participate in IMSA tests that are not mandatory. the fuel capacities will have to change based on the extra laps the Corvettes were able to do in the closing stages of Daytona. the other problem IMSA has is the first 3 races are all anomalies. the first normal-ish track is Laguna. Daytona, Sebring and Long Beach are all unique and really not standard circuits. tough situation as all teams are really racing BoP now and not engineering or driver prowess.

        • Bakkster

          February 19, 2016 at 12:38 pm

          If OEMs weren’t engineering better cars, why do teams keep buying the latest GT3 model even when it costs half a millions dollars?

          Note, I said ‘better’, not ‘faster’. Engineer the car to be easier to drive at the limit, and make the car perform at its peak longer in a tire stint.

          • juneracer

            February 20, 2016 at 8:51 am

            i still think ‘better’ is a BoP thing. if the rules lean toward more areo being allowed, they go that direction. that would make it easier to drive. the tires control the main grip and those are spec’d. not totally familar with how the GT3 BoP is done. IMSA wouldn’t allow non-2016 GTLMs to run this year. not sure how the rules and eligability of GT3s work.

      • Kirk

        February 19, 2016 at 1:27 pm

        That’s a good idea assuming the teams go all-out during the test. Problem is, it’s well documented how teams will sandbag during testing so they don’t get BoP’d to death just prior to the race.

        • Bakkster

          February 19, 2016 at 5:27 pm

          Yes, and IMSA has the new data loggers on the GTs that let them catch everybody sandbagging 😉

          They have to release the non-Daytona BoP sometime, and the teams might as well test at it. I don’t see the issue.

        • Dill pickles

          February 19, 2016 at 5:35 pm

          But IMSA has new onboard telemetry. They can tell more accurately how hard someone is pushing.

          A few teams still took advantage a bit, but isnt it interesting that one of the best Daytona 24s just took place after this new data logging capability went live?

          • Bakkster

            February 19, 2016 at 9:21 pm

            Not ‘some’ teams, every team got caught sandbagging.

          • juneracer

            February 20, 2016 at 8:46 am

            lap time is tough as we’re talking maybe 1 sec top to bottom of GTLM. brake a little early go to power a little late. its not hard to sand bag a lap time in this window. speed and acceleration is different. that should be in the data. but then you run full fuel and leaner mixes when you have to. difficult game to police.

  10. Nick1

    February 19, 2016 at 1:18 am

    I love BoP.

    • Kirk

      February 19, 2016 at 2:16 pm

      It’s an acquired taste, sort of like diet soda. Our doctors/IMSA tell us we can’t drink the sugary stuff anymore, so we’re left to either enjoy the diet soda or go without. Having been a soda drinker/sports car racing fan for 35+ years, I’d rather deal with having to drink diet than having to give it up altogether.

  11. Jason

    February 19, 2016 at 12:35 pm

    Here is a simple thing IMSA should do. Reduce the fuel capacity of the LMPC cars significantly. We don’t want them winning overall at Lime Rock. That needs to be GTLM.

  12. Matty

    February 20, 2016 at 8:07 pm

    Biggest beefs with this set:

    Corvette DP getting breaks, the difference in the Rolex 24 at Daytona was not car or engine, it was Pipo Derani.

    Porsche North America was best of the rest in GTLM and did not need its weight cut.

    CHip Ganassi Racing was distant off pace at Daytona and really got jyped with their weight raise.

    Also the new Audi R8 and the Lambo Huracan not being tagged yet in GTD is also odd.

  13. Jenner

    February 21, 2016 at 5:04 pm

    Am I having a senior moment? I don’t remember ALMS having BoP adjustments after every race.

    • Bakkster

      February 22, 2016 at 6:33 pm

      Daytona was always a unique BoP, just like Le Mans is.

      ALMS had pretty frequent adjustments as well (around 6 per season), though they also had fewer classes subject to BoP. ALMS also once gave ESM a better BoP for their Ferrari than Risi and AF Corse got, even though they had identical cars.

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