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DPis Slowed in Post-Daytona BoP

IMSA slows DPi cars ahead of next week’s Sebring test…

Photo: Barry Cantrell/IMSA

Photo: Barry Cantrell/IMSA

All cars running under IMSA’s new DPi platform have been slowed in the latest round of Balance of Performance adjustments following last month’s season-opening Rolex 24 at Daytona.

The Cadillac DPi-V.R, which dominated the race, along with both the Mazda RT24-P and Nissan Onroak DPi, are facing power cuts ahead of next week’s IMSA-sanctioned test at Sebring International Raceway.

The V8-powered Cadillac has been given a hefty 1.5mm reduction in air restrictor, while both the Mazda and Nissans have lost turbo boost across all power ranges.

Cadillac has also faced a 7-liter reduction in fuel capacity, along with a smaller refueling restrictor, while changes have also been made to the refueling restrictors for the Nissan and most Gibson-powered LMP2 cars.

No changes have been made to the LMP2-spec cars, which remain as the performance baseline in the Prototype class.

P class cars, meanwhile, will debut new “Sprint” aero packages, compared to the Daytona-only aero utilized in the season-opener.

BoP changes have also been made in the production-based classes, with the BMW M6 GTLM getting a 10kg weight break but facing a reduction in turbo boost ratio.

Weight adjustments have been handed to the Acura NSX GT3 (-20kg), Ferrari 488 GT3 (+10kg) and Lexus RC F GT3 (+10 kg) in GT Daytona, along with air restrictor increases for the Lamborghini Huracan GT3 (+1.0mm) and Lexus (+2mm) and fuel capacity boosts for both models as well.

The GTD-spec Ferrari, meanwhile, will have a reduced boost ratio across all power levels, following its strong run at Daytona.

IMSA reserves to make additional BoP adjustments prior to next month’s Mobil 1 Twelve Hours of Sebring, based on data gathered at next week’s test, which is mandatory for all manufacturers and constructors.

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. jeff

    February 16, 2017 at 6:00 pm

    Are you F*#king kidding ME ,,,,,,,,,,,, just saying

  2. daedalus

    February 16, 2017 at 6:08 pm

    well at least they are trying to right their failures at daytona with respect to the caddys, hopefully the racing at the top will be closer.

    It’s a shame they have to BOP based on race performance and results instead of just testing as the BOP is now working like success ballast or success pit stop seconds used in other championships.

  3. Nicolas

    February 16, 2017 at 6:11 pm

    We all knew the Cadillac were going to dominate at Daytona, why not doing the BOP before instead of after??

    • Andres

      February 16, 2017 at 6:25 pm


    • Bakkster

      February 16, 2017 at 6:30 pm

      You could have made the Cadillacs 3s/lap slower at Daytona and they still would have won, because they were the only cars not to break.

      • Jose

        February 16, 2017 at 6:40 pm

        Riley Gibson finished 3rd so…..About that.

        • Bakkster

          February 16, 2017 at 6:44 pm

          And they were limping home to the finish about 6s per lap slower than the Cadillacs at the same point in the race (which put them a lap down).

          • Jon

            February 16, 2017 at 11:25 pm

            Still though, if the Cadillacs had been just 3/10ths slower per lap all race long, that’s almost 200 second, VisitFlorida at least makes it interesting. And for reference, the three Cadillac’s had fast laps in the 1:36s while Visit Florida was 1:39. So 3/10ths would have been nothing.

            But there was no way IMSA was going to let a global spec LMP2 win over a DPi in their first race. No way. They stacked the deck for Caddy.

          • Bakkster

            February 17, 2017 at 9:19 am

            Those 200 seconds would have been eaten by cautions, though.

            The reality is, the VFR Riley was struggling to make the finish. After running 1:41s all race, they didn’t set a time that fast in the last 30 laps. The final stint they mostly ran 1:44s and 45s, and their last two laps were in the 1:50s. WTR was still running times within a second of their best laps.

            Of course, the VFR car could have pushed harder if they were in the hunt, but again they were not expecting to last more than an hour. Had they pushed, they probably wouldn’t have made it to the finish. So as bad as the BoP may or may not have been, the Cadillacs still had the best prepared cars to finish a 24h race with, and that’s why they won.

          • Kirk

            February 17, 2017 at 1:26 pm

            That’s true, because IMSA can try to balance performance as much as possible, but they can’t balance preparation. The Caddy’s had already run a 24 hour test but the VFR car was essentially still being put together when practice started. I overheard one of the VFR drivers on Thursday say how they were treating the weekend like a long test session.

      • Olly

        February 16, 2017 at 6:42 pm

        Same with the No. 22, they were running well until they collided with Henzler in the TRG Porsche.

      • Andy Flinn

        February 16, 2017 at 8:06 pm

        Bakkster is exactly right.

        The Cadillacs dominated because they were the best prepared by far for Daytona.

        The other prototypes – with the exception of VFR/Spirit of Daytona – encountered problems that kept them from Winner’s Circle.

  4. Tired of this !

    February 16, 2017 at 6:19 pm

    IMSA B.S. !!!!!!!!!!!! Couldn’t just slow the France cars had to address the others. Watch, the margin will be the same. Last year EMS got 2 BoP before Sebring.

    • Andy Flinn

      February 16, 2017 at 8:20 pm

      I’m sick of this, too.

      If you don’t like IMSA, go watch the Oreca/Gibson LMP2 specfest in the WEC. But please spare the rest of us.

      From a technical standpoint, I bet WEC LMP2 is going to be riveting this year.

      But hey, no need for BoP there.

      • Steven

        February 16, 2017 at 8:55 pm

        ELMS is where its at now. They did it right and have an extremely healthy prototype grid.

      • GTurner38

        February 17, 2017 at 12:33 pm

        Have you considered the possibility that the manufacturers want BoP? Yes, the teams might like the idea of open development, but that adds a lot of costs. BoP ensures they can have close competition without a spending war.

  5. Bakkster

    February 16, 2017 at 6:24 pm

    Before everyone flips out, this is the test BoP. For the test. So they can test how the cars perform with non-Daytona aero and track characteristics.

    The whole point of a test BoP is to collect more data so they can get it right for the race.

    • Combing

      February 16, 2017 at 7:08 pm

      They didn’t exactly get it right for the Roar or the 24.

      Or the last 2+ years.

      But yeah. I’m SURE they will have a handle on it by the 12.

    • Evan

      February 16, 2017 at 7:32 pm

      Bakkster bro… EVERYONE knows you’re an old guard Grand-Am apologist! All you do is defend IMSACAR’s actions. Do you seriously have anything else to do (job) besides champion IMSA’s BoP motives at every turn?! How about questioning them… maybe once. Perhaps you try that, someday.

      • Andy Flinn

        February 16, 2017 at 8:15 pm

        Evan, I’m sorry your pet prototype didn’t win at Daytona.

        Tell us which one it is and I’ll tell you EXACTLY why it lost.

      • Bakkster

        February 16, 2017 at 8:39 pm

        LOL, 8/10 joke post. Needs a better username for the perfect 10.

      • GTurner38

        February 17, 2017 at 7:31 pm

        I hated Grand Am, but I have no problem with BoP in this circumstance. For starters, so long as there are cars running under two different sets of rules in the same class and one of those sets of rules forbids upgrades, BoP will be necessary. Secondly, I’m absolutely certain that the bean counters at the manufacturers like the fact that they don’t have to pay to upgrade the cars every two months to stay competitive or worry about being stuck miles off the pace if development is frozen for periods of the season. The racers might not like it, but they wouldn’t be able to pay for the development out of their pocket.

    • Larry

      February 16, 2017 at 7:57 pm

      Are you serious?

      They didn’t get it right for Daytona because the Caddies OBVIOUSLY sandbagged. It wasn’t even close.

      In the past it was all “if you sandbag at the Roar, we will ding you”, this year it was “we got a handle on it”.

      Yeah, okay, some handle.

      • Bakkster

        February 16, 2017 at 8:40 pm

        Everyone else was detuned for reliability. The Riley wasn’t even expecting to last more than an hour, they hadn’t done more than 13 laps in a row (Cadillac had done thousands of miles in testing).

    • Brian

      February 16, 2017 at 9:34 pm

      Yep, just the first round folks…more to come

  6. Steven

    February 16, 2017 at 6:41 pm

    Rolex 24 win should go down with an asterisk.

    It’s a shame that an organization doesn’t just tell the team to pack up and get out. They clearly sandbagged just like the Ford’s at Le Mans and got rewarded for it.

    How about put an independent driver to lap in each car so a proper BoP can be set and teams are not allowed to touch the cars.

    • Bakkster

      February 16, 2017 at 6:45 pm

      “How about put an independent driver to lap in each car so a proper BoP can be set and teams are not allowed to touch the cars.”

      That’s what they do for GTE (at Ladoux), but that didn’t stop Le Mans from happening.

  7. #1 fin hater. remove them

    February 16, 2017 at 6:49 pm

    way to go IMSACAR

  8. David Chaste

    February 16, 2017 at 7:26 pm

    Independent driver or not, the same team will still prep and set up the car. They could set up the car with a not so optimal gear ratio or wheel differential etc. All kinds of things are possible.

    In LMP2 gear ratios are set and cannot be changed but in IMSA Even P2 cars can work on gear ratios. That’s almost an infinite combination and a guest test driver might not have enough laps to figure out the optimal gearing.

  9. David Chaste

    February 16, 2017 at 7:33 pm

    They should only penalize the Cadillacs. There’s no reason to suggest any other car should be penalized.

    Least of all the Mazdas. They were omitted on the Sebring poster and now they’re tagged for a penalty for no obvious reason. Did John Doonan renege on an “offer he couldn’t refuse” from Don Panoz or the France family?

    • Jack

      February 16, 2017 at 8:18 pm

      The Mazda was one of the quickest cars if you actually look at data. But it was clear beyond a doubt they turned their engines way down for reliability.

  10. Sunset Bend

    February 16, 2017 at 8:27 pm

    I don’t care whose DPi is favored, but I fail to see how DPi is an evolution of DP. How is this going to be any different than Chevy DP vs. the same old stuff?

    • Jack

      February 16, 2017 at 9:17 pm

      They kept the name, because they wanted to name it after what they own.

  11. Ron Mills

    February 16, 2017 at 9:32 pm

    My god-mellow out-it’s the best sportscar entertainment we have here-let them do their best and remember,it’s only entertainment.Let’s sit back and enjoy…

  12. John Holmes

    February 16, 2017 at 9:37 pm

    Not my Cadillac!! I’m going to wear a mask and go protest. Some of you sound like whiners from over at IMSA has all the data, I’m sure the racing will be close. IMSA is were it’s at!!! WEC not so much. (FYI I’m a Corvette fan boy)

    • Bert Anernie

      February 19, 2017 at 8:59 am

      The biggest criers in the game are at Badboy Vettes….their car wins their contrived title last season and they’re still crying the #62 Ferrari stomped their a$$ at Petite, they just can’t come to terms IMSA gave the Vettes the better performance until all the other teams were mathematically eliminated from title contention….from Lime Rock onwards the #62 Ferrari was the best car…but they had a couple of bad luck losses. IMSA doesn’t want a foreign made car winning its title, mark my word…the Ford will win the IMSA title this season. The Vettes are old and obsolete, and will be until the rumored mid-engined Vette rolls out. Just hope the WEC gets a handle on Ford sandbagging for LeMans. With the new 911 out this year, they will most likely get the better BOP at LeMans. Hopefully AF will show better at this years LeMans so AF or Risi can somehow get the 488 onto that top step at LeMans…(I’m a Ferrari fan boy)…LOL!!…

  13. Alexander King

    February 16, 2017 at 10:07 pm

    WHY they don’t wait until the test next week before taking a decision? it looks these morons are kidding with everybody.

  14. Matt

    February 16, 2017 at 10:35 pm

    Cool now can they remove the tailfins?

  15. Joel

    February 16, 2017 at 10:42 pm

    Death, taxes, and BOP adjustments. Everyone’s a critic.

    By the way Brad Kettler sucks

  16. Mike D.

    February 17, 2017 at 12:32 am

    This is where the series / teams releasing info about how the teams were running would go a long way to calming the fans.

    A large part of the uproar here is associated with the fact that we don’t KNOW whether the other teams were running detuned as was rumored. I think it’s very fair to suspect they were — Mazda has a history with its engine, ESM just switched back to the Nissan plant and wouldn’t want to kill a pair of engines 1 race in, which again leaves Visit Florida, also running detuned in a new package to them in the Gibson, who had solid success. Rebellion was at least in the ballpark, but I’ve heard even they were running down a little bit for reliability, unfortunately issues caught up with them anyway and very early. The Rebellion running in the hunt for even 4-5 hours would have done a lot to quell the outcry about this race.

    It’s also worth noting that the other prototypes were not uncompetitive in conditions more like the rest of the season or with level playing fields – the infield and adverse weather.

    We’re long removed from 2014. IMSA had a stellar BoP season last year. I don’t doubt the Caddies found something, just as I don’t doubt IMSA could have recognized this and tried to account for it. The biggest issue is the lack of transparency here that the fans are demanding with greater increase. We’re not going to get it to a certain extent, and that’s unfortunate but understandable. The problem is the appearance for IMSA when the biggest race of the season is first and it fails the eye test to an extent. That’s really the only thing I can fault them for so far.

    • WBrowning

      February 17, 2017 at 9:52 am

      Yeah, they found where the hid the sandbags!

    • GTurner38

      February 17, 2017 at 7:40 pm

      Do you want to be in the marketing department at Mazda writing the press release that tells the world you didn’t think your engine could last 24 hours? You might get away with that if you are the new team in an established series, but it will look really bad when all of the cars are new.

      On last year’s BoP, if I’m honest, it favored LMP2 most of the time. If Mazda hadn’t constantly suffered reliability and pit issues, they would have dominated the races that weren’t won by a Ligier with an all pro driver roster. That was the nature of trying balance those two concepts on tires that couldn’t possibly be right for both of them at the same time. Thankfully, it shouldn’t be as much of an issue in the new era.

      • The Brad

        February 18, 2017 at 7:10 pm

        Four Dorito Motor, problem solved for Mazda. Marketing can call it “a return to our racing roots and heritage”.

  17. el_gordo

    February 17, 2017 at 1:20 am

    The Roar should include a full points paying 2 hour race, that way if you want to hide something you start the 24 already down a championship points, and IMSA gets to collect a tight set of data prior to the 24. I’m a Corvette/Caddy fan and yes I didn’t like the domination. (I know other were running detuned, but Caddy was holding back a little too, disliked this race as much as I disliked LeMans last year.)

    • kevlow

      February 17, 2017 at 6:02 am

      Your idea actually has some merit to think about. “The Sprint at the Roar” or I would think of it as “The Two Hour Tease”.
      It would definitely put something at stake and sandbagging would have it’s own penalty built in. If after the practice sessions, teams suddenly changed set up or motor map for the race then IMSA would have true data.

      I am sure there is some down side to this but I am liking the idea more and more.

      • GTurner38

        February 17, 2017 at 7:41 pm

        Ford sandbagged through two WEC races to ensure a favorable Le Mans, so I wouldn’t be surprised to see the same thing happen in a Daytona sprint race.

  18. John

    February 17, 2017 at 5:16 am

    So the second, parallel competition is in earnest full swing.

    Gentlemen, load your sandbags!

    In other news, following the lead of IMSA, the NFL Competition Committee has announced that next season, the Patriots will have to gain 15 yards for a first down, and only score five points per touchdown, and two per field goal.

    Following suit, MLB has decreed that when teams play the Cubs, batters will be allotted four strikes, and be awarded a walk after three balls.

    • Mike S.

      February 17, 2017 at 10:35 am

      Well minor league baseball is testing putting a runner at 2nd if and when a game goes to the 10th inning. Just saying. Um BoP.

      • Kirk

        February 17, 2017 at 1:49 pm

        That’s not really BoP. That’s to speed up the game. IMSA did something similar a few years back when everyone complained about the lengthy cautions so they came up with the idea of “full” and “quickie” cautions to keep yellow flag time to a minimum.

    • Kirk

      February 17, 2017 at 1:46 pm

      “when teams play the Cubs, batters will be allotted four strikes, and be awarded a walk after three balls.” We win once in 108 years and you’re going to penalize us? I guess it’ll be ok though once you apply BoP penalties to the Dodgers, Yankees, Cardinals, etc.

      • John

        February 17, 2017 at 5:26 pm

        Remember, the league reserves the right to make adjustments prior to each contest.

        If the Dodgers and Cardinals batters are jacking too many balls out during BP, the league can step in.

        Batters caught choking up on their bats too much, to mask their power, they will be dealt with accordingly.

        Relax, they have a handle on it.

    • GTurner38

      February 17, 2017 at 7:44 pm

      Keep in mind that there are three cars in the field that cannot be upgraded by rule, so if you don’t want BoP, then you have to get rid of the LMP2s because you are telling them that they won’t be able to keep up with the pace of the class. That leaves a seven car field because no one is selling DPis to customer teams.

  19. Luna

    February 17, 2017 at 6:11 am

    One mm more restrictor for Lamborghini. Really!?
    That to compensate the poor quality of the teams running the car and the management of all the program. It is not BOP.

    • WBrowning

      February 17, 2017 at 9:55 am

      They couldn’t keep those things on the track, over half of the yellow flags at the 24 had to be Lamborghini spins and crashes.

  20. JaymondoGB

    February 17, 2017 at 6:21 am

    Good news, but will it be enough?

  21. TurdFerguson

    February 17, 2017 at 7:20 am

    BMW actually got additional boost in GTLM, not less boost as stated in the article. They will most likely be stomping at Sebring. Daytona is not a good track for them due to their aero disadvantage.

  22. Tito

    February 17, 2017 at 7:50 am

    It is obvious that after Daytona, the Nissan, Mazda and some of the P2 car will improve. Why they decide about BoP before the next week test?

    • GTurner38

      February 17, 2017 at 7:46 pm

      So they can see it in action and adjust again before the race if necessary.

  23. Ben B

    February 17, 2017 at 10:28 am

    Why are they making the top class SLOWER?

    • Kirk

      February 17, 2017 at 1:51 pm

      Not the whole class, only those DPi’s obviously quicker than the WEC P2 cars. IMSA decreed a long time ago all BoP would be based on the WEC P2 so as to keep those cars competitive when they decide to come over and race here.

    • JM

      February 18, 2017 at 1:09 pm

      I think they are slowing down the DPi cars to encourage manufacturers to start joining the DPi ranks. Once they have a majority of manufacturers in the ranks they will open up the reigns and let them run. It will be LMP1 but not as expensive for manufacturers. I think in the future IMSA will be just DPi and GTD and WEC will be DPi and GTLM. LMP2 will become a support series for teams to establish themselves.

  24. CarbonRocks

    February 17, 2017 at 10:46 am

    ESM cars ran same lap times and speeds as last year with a larger engine with more boost and a car 4″ narrower. Nobody else should be punished because they couldn’t figure out their car or sandbagged hoping to win Sebring knowing they couldn’t compete at Daytona or didn’t expect to finish.

    Mazda has fastest top speed and then backed it off.

    Both boosted cars have BOP (boost) knobs in the cars that can be used to dial back power, skewing average top speed and lap time numbers, and go to full power only when they can sniff the lead at a time points are awarded. Sord of like what ESM did last year at every single Endurance points time limit.

    • Andres

      February 17, 2017 at 7:12 pm

      The Cadillac was the fastest car, it was running 202-205mph

  25. Parker

    February 17, 2017 at 11:53 am

    Whatever happened to the days where if you had a slow car the onus was on you to catch up to the field instead of being on the sanctioning body. The problem with racing today is the constant attempt to equalize outcomes whether it be spec racing or BOP.

    The reward for Cadillac/Dallara building a better car than the competition is restrictions on their performance by the sanctioning body. That isn’t right to me.

    • TJ

      February 17, 2017 at 6:13 pm

      All racing is spec racing now. Think about it. They spec the cars, the spec the outcomes, they even spec the drivers. It never seems to be fair either. I know I’ve seen Ferrari get all kinds of help. I’ve seen Ferraris after losing a race to Chevy at the next race after BOP somehow become better than the Chevys in acceleration, top end, and fuel mileage. They didn’t even seem to be slower to begin with. After three or four Ferrari total race dominations new BOPs may come out. Penalties seem to fall into the BOP column at times, too. (Just used Ferrari as an example) The Vettes usually win in the pits.

      • Andy Flinn

        February 18, 2017 at 5:48 pm

        TJ, spec racing means same chassis, same body, same engine.

    • GTurner38

      February 17, 2017 at 7:48 pm

      How is Visit Florida Racing supposed to catch up when they can’t upgrade their car until 2021?

  26. Tim

    February 17, 2017 at 1:09 pm

    It is obviously NOT a mandatory test for all team and manufacturers because the Ferrari GTD team is not on the entry list..! They’re quite confident they can still stomp everyone even with the hairline tweak in the boost numbers.

    Anyone else find it weird that the two slowest cars in a straight line have the same BOP and the fastest cars have even MORE power given to them..?

  27. Bob

    February 19, 2017 at 11:16 am

    When GM sinks this much $ into a program, you have to expect a reward for it. Come on guys, they got their win now let’s move on. Don’t you know if they didn’t get the win, all the hollering NASCAR would have to had listened to? Common sense here.

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