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PWC Makes Sweeping Overnight BoP Changes to GTS Class

SRO, WC Vision make sweeping overnight Balance of Performance adjustments to GTS class…

Photo: PWC

SRO Motorsports Group and WC Vision have made sweeping overnight Balance of Performance changes to the majority of the GTS field, with seven of the 11 cars receiving weight and/or ride-height changes ahead of today’s season-opening Sprint race.

Weight adjustments have been made to the Audi R8 LMS GT4 (-15 kg), BMW M4 GT4 (-25 kg), Mercedes-AMG GT4 (-15 kg), Porsche Cayman GT4 Clubsport MR (+10 kg), Maserati GT4 (-10 kg) and McLaren 570S GT4 (-10 kg).

Both the Mercedes and Maserati, meanwhile, have been given a -5 mm reduction in ride height, with the Porsche hit with a 5mm increase and the SIN R1 GT4 getting -2mm less ground clearance as well as a revised max throttle setting.

The changes were communicated to teams Friday evening following final practice, just one day after a series of initial adjustments were made prior prior to the start of on-track action.

“Both practices are complete, so we’re heading into qualifying with a weight we didn’t get to test,” said Flying Lizard Motorsports team manager Chris Barber.

Muehlner Motorsports team boss Bernhard Muehlner was outraged by the adjustments to the Porsche GT4 car, which set the pace on Friday in the hands of Gabriele Piana.

“We were told the Porsche, as the baseline car [for BoP] that it could not be adjusted,” Muehlner told Sportscar365.

“The other thing is that they balanced the car, not the driver. Look at where the other Cayman was. Balance of Performance is for the cars, not the drivers.”

It is not the first time PWC has made BoP changes during a race weekend, with last year’s GTS season-opener at St. Pete also having seen multiple revisions.

GTS qualifying is set for 9:40 a.m. ET, with Race 1 set for 5:05 p.m.

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. Rocket J Squirrel

    March 10, 2018 at 9:48 am

    Well I guess that’s one way to get the GTS grids down to a size where they can run combined with GT.

  2. Gaucherie

    March 10, 2018 at 9:52 am

    Yet more yakety-sax from PWC. Not content with expecting a 12 car field in their headline class to be worth watching, let’s piss off all the GTS teams as well and convince a bunch of them that this isn’t worth the hassle and that the CTSCC might be a better option.

    As amateur as ever.

  3. Kyle

    March 10, 2018 at 10:08 am

    Was there a justification given for this? Seems bizarre.

  4. Jaymo

    March 10, 2018 at 10:17 am

    PWC is such a shitshow. It’s incredible.

    Also what the hell is “max throttle” for the SIN?

  5. BobKnowsBest

    March 10, 2018 at 11:48 am

    Looks like PWC are blameless for this one – direction seems to have come from up-above (SRO Directive). Guess that’s what you get when you have a controlling interest in a race series:

  6. daedalus

    March 10, 2018 at 12:15 pm

    There are always BOP adjustments for the first meeting of the year, people should not freak out about this. It’s just better to do it now before first qualy or race than after races have run. The BOP in GT4 has always been stella by the SRO (they have been doing for 10 years now so they know their stuff) so I have no problem with them tinkering a little before the season starts proper.

  7. Randy Dauber

    March 10, 2018 at 1:12 pm

    Just another example of how poorly run sportscar racing is in America. IMSA with their major issues (Flying Lizard, Magnus, Job, Land, etc) issues, and PWC.

    Truly embarrassing. Does anyone really wonder why sportscar racing is so poorly watched and attended in the US with garbage like this?

  8. Georg

    March 11, 2018 at 4:06 am

    Porsche still got on pole and P2 in the race despite last minute weight AND ride height increases, so that should prove those decisions were called for.

    • Jack

      March 12, 2018 at 8:19 am

      Just goes to show you how strong the BoP for the Porsche is. But the Audi is the sleeper in the whole deal.

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