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DPis Slowed Again for Long Beach

All four DPi manufacturers slowed for opening sprint of season…

Photo: Rick Dole/IMSA

All four DPi manufacturers have been hit with Balance of Performance changes ahead of next weekend’s IMSA WeatherTech SportsCar Championship round at Long Beach.

There have been boost reductions across the board for the three teams running turbocharged prototypes.

The Acura ARX-05, Mazda RT24-P and Mobil 1 Twelve Hours of Sebring-winning Nissan Onroak DPi have all had their boost levels affected for the first sprint race of the year.

Cadillac’s DPi-V.R, meanwhile, will run with a 0.6 mm smaller air restrictor than it had at Sebring, while the Joest-run Mazda DPis have also been been hit with a 10 kg weight increase.

No aero changes have been made to the Prototype category, which has 14 cars listed for the third round of the season.

All four DPi manufacturers, however, will have reduced fuel capacities, with Acura and Nissan losing 3 liters, Cadillac 2 liters less and the Mazda getting handed a considerable 7-liter decrease.

The changes come amid a dominant run from DPis at Sebring, which saw the global-spec LMP2 cars, which are not subject to BoP adjustments by IMSA, struggle to match the pace in the 12-hour race.

BMWs Slowed After Sebring Breakout

In GT Le Mans, the pair of BMW M8 GTEs have had its turbo boost power levels cut between 5000 and 7500 rpm, in addition to a 4-liter fuel capacity reduction.

The German manufacturer has also been handed a BoP change in GT Daytona, which is set for the next round at Mid-Ohio.

The Turner Motorsport-run BMW M6 GT3 will have a 20 kg weight decrease and 2-liter fuel reduction for the May 4-6 race, which will see all three classes back in action together.

Daniel Lloyd is a UK-based reporter for Sportscar365 and e-racing365, with a focus on the FIA World Endurance Championship and various electric racing series.



  1. lol

    April 6, 2018 at 3:02 pm


  2. Gery

    April 6, 2018 at 3:53 pm

    Another stab to kill real racing. Stupid.

  3. Johannes275

    April 6, 2018 at 4:09 pm

    Jumping on all four DPis will not change a single thing, I’m sure of it.

    • Jack

      April 6, 2018 at 7:34 pm

      Fastest lap might go to a lmp2, but, it will u likely matter due to the fact that every lmp2 besides the 52 has an amateur driver. So a DPi will very likely win.

  4. Socialist

    April 6, 2018 at 4:38 pm

    I am glad that IMSA is continuing to address the speed inequality issue between the manufacturers.

    • communist

      April 6, 2018 at 6:01 pm

      BoP saved motorsport

    • EduardoGarcia

      April 7, 2018 at 10:10 am

      Penalice any technical superiority. Sounds like they are socialist democRats.

  5. Steven

    April 6, 2018 at 5:26 pm

    Personally, none of these BoP changes will do anything. IMSA is just putting a BoP together to try and make it like they are doing something, but the DPi’s will still be 1-2 seconds/lap faster than the baseline LMP2.

    • Jack

      April 6, 2018 at 7:35 pm

      Lmp2 might are fastest lap, but they all have an drivers and are unlikely to win without some serious luck with yellows.

  6. Mazda Greg

    April 6, 2018 at 8:13 pm

    Did I miss something, like Mazda winning Sebring. I must be very frustrating for teams to constantly doing this one step forward two steps back routine. This is not supposed to be NASCAR.

    • Bird

      April 6, 2018 at 8:28 pm

      What are you talking about?

  7. David Chaste

    April 6, 2018 at 9:40 pm

    The only true gentleman in the P2 Gibson cars is John Bennet. Everyone else in those cars was at some point in their careers an f1 or indy hopeful.

  8. Andrew Pyke

    April 7, 2018 at 2:13 am

    It a nice to know how far ahead DPi are from LMP2. Should be a great selling point for governing bodies and manufacters during 2020 regulation discussions. Perhaps knowing LMP1 is a close target for the current DPi.

  9. EduardoGarcia

    April 7, 2018 at 10:13 am

    Like whores, the better you are, the more you get screwed.

  10. EduardoGarcia

    April 7, 2018 at 10:15 am

    Penalice any technical superiority. Sounds like they are socialist democRats.

  11. Larry

    April 7, 2018 at 12:52 pm

    The P2 cars biggest disadvantage, as mentioned, is their driver lineups.

    Some of the P2 cars might have a good pro in them, but every one of the also has a Silver or Bronze driver in the lineup. Oh, they may have raced elsewhere at some point when they were younger, but they either didn’t have the talent to make it in F1, etc or they are older now with the skills diminished by time.

    They can BOP ’til they turn blue, but it ain’t gonna help the lack of driver talent.

    • daedalus

      April 12, 2018 at 11:42 pm

      The BOP is based on pace not results, it does not matter that there is an AM driver in the lineup. IMSA looks at the pro drivers times for the LMP2s and they were all about a second off the pace at sebring and half a second at daytona.

      Some people say that IMSA wanted DPIs to win at the big endurance events whilst letting the LMP2s have a shot in the other races. I don’t know if there is any truth to this or if Brian France has any say over the matter but the end result is that the LMP2 teams will jump ship to ELMS if they feel they are being treated as second class citizens.

  12. Bwangi Kilonzo

    April 10, 2018 at 4:05 pm

    Instead of slowing them down, Why do they not just make them faster? Its racing after all, is it not?

    • daedalus

      April 12, 2018 at 11:33 pm

      not possible, IMSA set the rules over 2 years ago saying LMP2 would be the baseline and DPI would be BOPed to it, normally you can’t change the rules mid season. The NA Gibson also has limited scope for power increases and was designed with a ACO mandated power target rather than the max possible power.

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