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Toyota, Porsche Recover “Significant Part” of LMP1 Aero Deficit

LMP1 manufacturers already recover majority of aero reduction…

Photo: Vision Sport Agency

Photo: Vision Sport Agency

Both Porsche and Toyota have already recovered the majority of the FIA and ACO’s newly imposed aero reductions on LMP1 hybrids, aimed to reduce cornering speeds and improve overall safety in the top class of the World Endurance Championship.

The updated prototypes are noticeably different in appearance this year, with a 15mm taller front splitter, narrower rear diffuser and the elimination of vanes on the sidepods, which were determined in FIA studies to increase the likelihood of the cars becoming airborne in high-speed spins.

While ACO Sporting Director Vincent Beaumesnil admitted the changes were aimed to reduce downforce by up to 30 percent, both Toyota’s Vasselon and Porsche LMP1 team principal Andreas Seidl have revealed the numbers are not that significant, due to further off-season developments.

Vasselon explained that Toyota first implemented the changes on its 2016-spec TS050 Hybrid in testing last year, which equated to a 4.5-second per lap loss at Le Mans, and roughly 2 seconds on an average track.

“The aero performance was really down when we just implemented the rules,” Vasselon said. “Then the magic of aero development came and we have recovered a significant part of the downforce, but we’re at lower aero efficiency than last year.

“You will see that the cars look a bit different because it has opened a few things, which last year were not possible or less efficient.”

Beaumesnil said discussions on ways to reduce aero efficiency began nearly two years ago, when LMP1 cars initially saw a significant spike in performance.

Power cuts were rolled out last year, but led to increased cornering speeds, prompting further safety concerns.

“In 2015, there was a huge step in performance,” Beaumesnil told Sportscar365.

“Nobody expected such a step in performance. At that moment we said that we must slow down the cars because at some stage it could be an issue, so we started to work.”

While the biggest change for 2017 has been with the splitter and diffuser, the elimination of the vanes could help keep the cars better planted on the ground.

“It wasn’t interfering with the performance of the car,” Vasselon said. “But we realized after we’ve done a lot of CFD studies with the FIA, Porsche and Audi, these vanes were lifting [the car] quite a lot when spinning.”

Despite the restrictions in place, Porsche’s Seidl believes lap times should remain in the same ballpark to last year. 

“From what we’ve seen so far in testing, I think we will not be far from the 2016 lap times,” he said. “But this is the step we’ve made over all the developments that we did.”

Vasselon said they expect to fully recover the aero deficit on their TS050 Hybrid by net year.

“When a rule targets to control performance, we never target to really reduce performance,” he said. “We want to reduce the progress of performance.

“I think the cars are still progressing but not as quickly as they would have progressed without this kind of regulations change.”

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. Matt

    April 12, 2017 at 9:30 am

    “Nobody expected such a step in performance. At that moment we said that we must slow down the cars because at some stage it could be an issue, so we started to work.”
    Wow, the Europeans never learn do they?? Stop micromanaging the rulebooks. The cars being “faster than expected” is not an excuse to change the rules. The tracks are already rediculously safe and putting a limit on speed is embarrassing. The notion that fast cars is a bad thing is a terrible message to fans and needs to stop.

    • jack

      April 12, 2017 at 9:45 am

      dont forget the americans changed the rules which made to the cars 14 seconds slower for safety(2002-2003 grand am), also has a 200 mph at daytona. so dont blame europeans for slowing the cars down that were so fast they were almost to the point of lapping the gt field every 4 laps…. on an 8.5 mile track

      • jack

        April 12, 2017 at 9:45 am

        200 mph*

      • Anon

        April 12, 2017 at 1:36 pm

        Slowing down the cars at Daytona has more to do with tires.

        • jeff

          April 12, 2017 at 1:46 pm

          liability more so than tires

    • GR88

      April 12, 2017 at 3:54 pm

      A misinformed comment Matt. With open formulas development never stops, safety becomes a real issue.

      The cars aren’t slowed in any meaningful way, it’s about capping performance while still encouraging innovation. If the cars only raced on Grade one circuits, with only prototypes on track, they could let them go a little quicker. Add in multi-class racing and Le Mans, it becomes obvious performance needs to be capped at around the 3.20 level.

      In 10 years they’ll still be doing 3.20 (assuming Le Mans isn’t completely renovated), but they’ll be achieving those times with 25%+ less fuel, less rubber and less aero (size of wings).

    • gtgianlu

      April 12, 2017 at 4:55 pm

      Mind,they race with already much slower cars as Gts.Regs try to keep a reasonable performance gap among all classes

    • wcd

      April 13, 2017 at 1:38 am

      No changes ever = endless performance gains. There’s no end limit. Stop living in some video game world.

      > The tracks are already rediculously safe

      Except that one in the French countryside.

    • GTurner38

      April 13, 2017 at 7:04 pm

      Saying the tracks are ridiculously safe seems to ignore recent history at Le Mans. We’ve seen cars utterly destroyed at Le Mans in the WEC era. There’s a reason why the Indy 500 didn’t just keep letting the cars creep the speeds up, and it’s because at the rate things were going they’d have to make the track safe for 270 mph.

  2. #1 BIG UGLY FIN hater

    April 12, 2017 at 12:52 pm


    • TF110

      April 12, 2017 at 2:05 pm

      Go watch some other form of racing or GT class if you are offended by the prototype fins.

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