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LMP2s Get Weight Increase for Laguna Seca

LMP2 cars given 10kg weight increases in first-ever Balance of Performance adjustment…

Photo: Rick Dole/IMSA

LMP2 cars have been given an increase in minimum weight ahead of next weekend’s Continental Tire Monterey Grand Prix at WeatherTech Raceway Laguna Seca, in the first-ever Balance of Performance adjustment for the ACO global-spec prototypes.

It comes on the heels of three consecutive overall wins by LMP2 machinery in the IMSA WeatherTech SportsCar Championship and returning to the site of the platform’s maiden win last year.

Released on Thursday, the latest BoP table confirms that the Oreca 07 Gibson  will run with 10 kg of additional weight and a three-liter reduction in fuel capacity.

All other LMP2 cars will have the same adjustments, but none are entered for the penultimate race of the season.

It brings the weight of the LMP2s up to 940 kg, with the cars having been crash-test certified at 950 kg.

The FIA and ACO’s licensing agreement with IMSA states that BoP changes can be made to the cars, but only if made to all LMP2 machinery, which had been established as the Prototype category’s performance baseline.

DPis, meanwhile, have been handed 2 liters of additional fuel capacity, while the Mazda RT24-P has been given a further 10 kg weight break for the Laguna round.

“Based on what we saw coming out of Road America and the previous two races, we thought it was time to make an adjustment to that platform, as well as a small adjustment to the DPi platform,” said IMSA technical chief Geoff Carter.

“We’ve always said we’ve balanced to the best example of P2. Now we’re changing that reference.”

Carter said there are no contractual obligations that had prevented IMSA from making a LMP2-wide BoP adjustment in the past.

“The only stipulation is that we don’t BoP between cars,” Carter said. “We’ve had this latitude the whole time.

“There’s always been an understanding with the ACO, specifically Thierry [Bouvet, ACO technical delegate], that LMP2 was the reference performance level. But we feel we’ve gotten to the point where this is a more common sense approach in balancing two platforms.”

Carter said the changes are unrelated to anything that could be in the pipeline for 2019, amid the previously announced class separation of DPi and LMP2 cars. 

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. Mike D.

    August 30, 2018 at 2:49 pm

    > The FIA and ACO’s licensing agreement with IMSA states that BoP changes can be made but only done with all LMP2 cars, which had been established as the Prototype category’s performance baseline.

    How do you even “license” a regulation set? If I wanted to buy an LMP2 car and go pidgeonhole it into running Thunderhill, the FIA/ACO couldn’t stop me.

    This whole concept makes absolutely no sense and should be automatically void.

    • David Chaste

      August 30, 2018 at 5:14 pm

      Normally yes imsa does not need the aco and fia to regulate their (imsa’s) lmp2 guidelines. But because imsa gives automatic invites to lemans for the best amateur p2 driver, their understanding is that they dont someone racing a p2 in imsa that performs differently than in wec or elms. In exchange imsa gets input on future p2 regulations, or can suggest changes.

      But imsa could go entirely solo if they wanted. But gentlemen drivers like the auto invite.

  2. Ricky Joe Johnson

    August 30, 2018 at 3:05 pm

    Stick it to those french losers! #MakeAmericaSportscarAgain

    • Butthead

      August 30, 2018 at 5:25 pm

      You spelled it wrong.


    • Jenner

      August 31, 2018 at 5:41 am

      Speaking of French dudes, I think I saw the French dude that heads the ACO at the Monterey Motorsports Reunion last weekend. Atherton and a lot of IMSA guys were there also.

      Saw Doug Fehan, TK, McNish, Pirro, Pruitt, John Morton, Peter Brock, Jackie Stewart, Steve Millen, Roberto Guerrero, Davy Jones David Hobbs, Justin & Derek Bell too.

      It was the place to be last weekend.

  3. Steven

    August 30, 2018 at 3:11 pm

    I was expecting IMSA to make all LMP2 entries start one lap down to the DPi’s.

    • Andy Flinn

      August 30, 2018 at 9:13 pm

      Steven, IMSA should just disqualify all the DPis.

      • Steven

        August 31, 2018 at 5:38 pm

        Or IMSA can just not allow Colin Braun to be in the car for more than 30 minutes on a race weekend.

  4. N8

    August 30, 2018 at 3:56 pm

    I’d say this is the easy way out and they should have just given back what you’ve taken away from the DPi’s, BUT, one could argue that the Oreca/Gibson is actually the best overall package for the back half of the IMSA calendar. This thing has been unchecked since it left the rovals, airports and temporary street circuits behind.

    If the ACO really cares about providing cost certainty to ALL but one of the P2 constructors, BoP’ing between cars is the only future for the diversity of the category.

    • NASCAR/DPs Suck

      August 30, 2018 at 5:07 pm

      Agreed, maybe the standard Oreca is showing something in telemetry that makes them think this is the best move.

  5. Dave

    August 30, 2018 at 4:09 pm

    A glimpse of the future where DPis have a performance advantage and another set of cars to navigate around the track. I do think it’s a bit unfair to hamstring the P2s before they have their own class. If you are going to do anything, just bring the DPis back to where they were at the beginning of the season. Adjusting the P2s negatively and the DPis positively seems like a a Toyota-type nod to the manufacturers and not in the spirit of racing. There’s only two rounds left and just 5 months to Daytona.

    • Ryan

      August 30, 2018 at 8:11 pm

      Honest question – how is this hamstringing the P2s? If the true intent is to have equal cars (not drivers), wouldn’t this be a step in the right direction? If Jon Bennet weren’t in the Core car and instead it were one of the Taylor brothers, Dane Cameron, etc, with Colin Braun, that car would have led the last few races flag to flag. It very well may have been able to lap half the field. And that’s not too pick on Jon Bennet, I’m glad he races and it’s a true Pro-Am entry, but the fact they wax the all pro Mazdas, Acuras, and Cadillacs send to show the pendulum went too far the other direction.

      • Andy Flinn

        August 30, 2018 at 9:07 pm

        Ryan, you only think that because you are obviously paying attention, unlike many who comment here.

      • Dave

        August 30, 2018 at 11:31 pm

        because i don’t believe the true intent is to have equal cars any longer. 2L is significant at Laguna and the weight is too given the climb up to the corkscrew and the front straight

  6. Trust No One

    August 30, 2018 at 5:10 pm

    Interesting to discover that IMSA has always had this option in their back pocket, but has chosen not to use it.

    Certainly casts a new light on its “efforts” to bring about DPi/P2 “parity” and the outcomes of the competition.

    To be a sports car fan, it doesn’t hurt to have a certain level of skepticism, if not suspicion.

  7. lol

    August 30, 2018 at 6:31 pm

    cant have a p2 car have a shot at the championship

  8. AGT Class

    August 30, 2018 at 6:54 pm

    looking forward to watching 1 of the 50 cadillacs to win almost everything next year

    • Martin

      August 30, 2018 at 8:46 pm

      Perhaps you can write to Acura and Mazda and ask them to make their car available…

      • Mike S.

        August 31, 2018 at 12:01 am

        Would anyone want a venerable and proven winning Mazda anyway? Oh wait taking out any costs differences or package differences and support since Acura has returned this season hasn’t it already won more races than the Mazda in their last 5 years?? I like the company and all but Acura would be first choice if they were both available and other factors being equal.

        • Martin

          August 31, 2018 at 10:38 am

          Agreed, is personally want to race the Acura before the Mazda, but was really just trying to make the point that you can’t be mad at Cadillac for actually making their car available. I’d prefer greater diversity in dpi, but I’m not going to complain about more Cadillacs as I’d take that over just having more Oreca lpm2s. Hopefully the following year there are both Acuras and Mazdas in the have if privateers.

    • Andy Flinn

      August 30, 2018 at 9:11 pm

      AGT Class, you must “love” watching WEC LMP2 with Oreca.

      You don’t have to look forward to “enjoy” that.

  9. Mike S.

    August 31, 2018 at 12:06 am

    Yeah with class separation immenent for next year I also thought that DPi’s would get horsepower increase and help not punish and slow the P2s. The P2s were winning on fuel efficiency and some lick. Will the DPis next year have worse fuel economy to go with that speeding up of 8%-10% more horsepower?

    • Haskellb

      September 1, 2018 at 12:49 pm

      Before After
      P2 – 75L P2 – 72L
      Cadillac – 68L Cadillac – 70L
      Acura – 71L Acura – 73L
      Mazda – 78L Mazda – 80L
      Nissan – 80L Nissan – 82L

      Is it just me or does anyone else find it odd that a Chevy small-block is the most fuel efficient engine in the class?

      • Mike coter

        September 5, 2018 at 5:47 pm

        no, they give the caddy the smaller tank to limit the advantage of it has in horsepower, I want to see the American cars win but not be dominate the series

  10. Graphene

    September 2, 2018 at 11:56 am

    They need to BOP a GM engine into the Mazdurr.

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