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Cadillac DPis Slowed in Pre-Rolex 24 BoP

IMSA makes pre-Rolex 24 Balance of Performance adjustments to multiple cars…

Photo: Jake Galstad/IMSA

The Cadillac DPi-V.Rs have been slowed following a series of Balance of Performance adjustments made ahead of next weekend’s Rolex 24 at Daytona.

Changes have been made to multiple cars in all three categories in the WeatherTech SportsCar Championship, with IMSA having issued the revised BoP tables on Thursday.

The Cadillac DPis, which dominated the pre-season test, have been hit with a 0.6mm smaller air restrictor, bringing it down to 31.6mm x2 in size.

Adjustments in fuel capacity (+1 liter) and refueling restrictor (+0.5mm) have been made to compensate for the Cadillac’s power loss, ahead of its first race with its revised 5.5-liter V8 powerplant.

While the Nissan Onroak DPis have been given a power increase at the mid-to-high range, Mazda’s RT24-P has been handed a slight reduction in turbo boost pressures, although now permitted to run a maximum of 8600 RPM.

Most importantly, though, the Mazda DPi can shed a further 15kg in weight, bringing the Multimatic-built car down to 915kg, as the lightest prototype in the class.

Additionally, aero adjustments have been made to the Acura ARX-05, Mazda and Nissan DPis, although with fuel capacity changes for the Acura and Nissan..

BMW M8 GTE Gets Break

The new BMW M8 GTE, which struggled at the Roar, meanwhile, has been given performance breaks for the race, in the form of a turbo boost increase and a 10kg minimum weight decrease.

It brings the new-for-2018 GTE contender down to 1240kg, the same base weight of the Corvette C7.R, which along with the Ford GT, have adjusted minimum rear wing angles. 

Fuel capacity changes have been made to GT Le Mans cars across the board, except for the Ferrari 488 GTE, which remains at 87 liters.

The GT Daytona class sees weight changes for the Acura NSX GT3 (+10kg) and Mercedes-AMG GT3 (-15kg) and power adjustments for the Audi R8 LMS and Lamborghini Huracan GT3 (-1.0mm) as well as a boost increase for the BMW M6 GT3.

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. Truth

    January 18, 2018 at 2:54 pm

    You show your speed you get fucking penalized!!!!! You sandbag you get fucking penalized!!!!!! This is fucking horse shit!!!!!!!!! FUCK BOP!!!!!!!!

    • Craig

      January 18, 2018 at 3:00 pm

      Wow man, get a grip of yourself. They only penalized one team for sandbagging and that was the core car. The Cadillac clearly showed that it was faster than the rest of the field.

      • TailsLeMans722

        January 18, 2018 at 3:04 pm

        I think a couple of GTD cars got pulled over for sandbagging as well…

      • Truth

        January 18, 2018 at 3:12 pm

        What is the point of going ten tenths in practice if the sanctioning body is going to penalize it for the biggest race of the season.

        • Max

          January 18, 2018 at 5:43 pm

          The point is if you’re not going 10/10ths they’ll penalize you at the end of the race. Cadillac is playing it right.

    • Parker

      January 18, 2018 at 3:01 pm

      It seems as if the performers were punished more than the sandbaggers (again). BOP must be eliminated.

      • el_gordo

        January 18, 2018 at 3:36 pm

        no, I’m a Cadillac fan and I want to see good racing, not Cadillac domination

    • Steven

      January 18, 2018 at 4:06 pm

      So if Caddy wants to play with the big boys with no BoP, they should build and race in LMP1. If they don’t want to, quit crying because IMSA wants to keep DPi/LMP2 together and they BoP to the cost-capped LMP2 class.

      the only way BoP ends is IMSA splits the classes into their own categories which they should’ve done in the first place.

    • prototypes are ugly

      January 18, 2018 at 4:34 pm

      i agree

    • Matt

      January 18, 2018 at 11:45 pm

      I love how this guy gets away with all this cursing but I say one thing Dagy’s doesn’t like and he gives me an IP ban. Incredible.

      • Truth

        January 19, 2018 at 8:51 am

        I apologize to all. I got carried away. But, I really cannot stand BOP.

  2. TailsLeMans722

    January 18, 2018 at 2:55 pm

    Very interesting. On the one hand these changes should, in theory, result in a closer race for the overall win than it would have been otherwise.

    However, if the rumours are true and the other DPi Manufacturers were sandbagging at the Roar, then IMSA could end up with egg on their faces if we suddenly end up with both Penske Acura’s 1-2 in qualifying by a huge margin.

    Time will tell of course, but rest assured there will be no excuses if IMSA messes up the Prototype BOP again.

    • Kirk

      January 18, 2018 at 3:02 pm

      I doubt anyone would go like gangbusters and risk reprisals just to qualify for a 24 hour race. If there’s one race all year where qualifying has zero importance, it’s Daytona.

    • Steven

      January 18, 2018 at 4:09 pm

      Every DPi manufacture was sandbagging at the roar. Problem is that IMSA does not have the balls to actually park a manufacture in practice for sandbagging.

  3. jason

    January 18, 2018 at 2:56 pm

    Good to see some weight shed from the Mercedes AMG.

  4. Truth

    January 18, 2018 at 2:56 pm

    I’m sorry, I thought this was racing not communism!!!!!!!

    • Mo

      January 18, 2018 at 3:18 pm

      Lol, you need to read up on communism.

    • Nick

      January 18, 2018 at 4:28 pm

      !!!!!!!!!!!!!!!!!ITS THE END OF THE WORLD!!!!!!!!!!!!!!!!!!!!!!

    • Ramshoek

      January 19, 2018 at 3:46 am

      Funny to see that the most successful racing series in the USA shows the most signs of communism > 60’s technology, all identical cars running around in circles…

  5. jason

    January 18, 2018 at 2:56 pm

    “Fuel capacity changes have been made to GT Le Mans cars across the board, except for the Ferrari 488 GTE, which remains at 87 liters.”

    Increase or Decrease?

  6. Carl

    January 18, 2018 at 3:02 pm

    BMW – more
    Corvette – more
    Ford – more
    Porsche – less

  7. Amlv20

    January 18, 2018 at 3:39 pm

    lol,I’m going to laugh my ass off come next Friday when the Penske Acura qualify 2 seconds faster then anyone else..buahahaha…….

    • TailsLeMans722

      January 18, 2018 at 3:50 pm

      I doubt Penske will suddenly find 2 seconds in just a few weeks, but they will definitely be closer to the Cadillacs than at the Roar.

      • Josh

        January 18, 2018 at 8:38 pm

        Don’t forget Derani. That Brazilian machine gunner wasn’t in the Nissan during the Roar. He keeps it on the track he’ll be on the Acura’s tails too.

  8. JoeDirt

    January 18, 2018 at 3:43 pm

    Would this be an option?

    Imsa (as in the organization) should have thier own drivers to test cars at random.

    • jm

      January 18, 2018 at 4:08 pm

      Yes. Get someone like soon to be retired Scott Pruett he has enough experience in everything. Then you would get a real baseline for bop. Plus the drivers talent would then become more important for speed than just machinery.

      • Matt

        January 18, 2018 at 4:42 pm

        This would be a great solution.

        • Noah

          January 18, 2018 at 5:02 pm

          An impartial driver would be great, but couldn’t the teams just setup the cars to perform poorly then? I’d love to see it but I can’t imagine how much time and resources it would take to have one driver test with every team in a class, optimize the setup, and go and put out some quality laps. You’d almost need an impartial engineer to make sure the team is doing what is needed to make it as quick as possible for said impartial driver. Agreed on Pruett though, he would be a great driver for something like that.

          • jm

            January 18, 2018 at 8:25 pm

            In prototype you would only have to run one from each make. Not each team. Assuming you don’t bop lmp2 that’s only 4 dpi. Plus I think that you could learn a lot of additional info without having to try and run a quality lap. You really just need data that shows what sandbagging hides. Acceleration, braking, ect. If the test driver finds more time then bop will be based off that data.

    • Pete

      January 18, 2018 at 4:50 pm

      I’ve considered this before. The only potential problem I can see with it is the fact that you would also need a team of mechanics/engineers that were both unbiased but also so knowledgeable about each chassis that they could optimize the performance of the car for that test driver.

      Obviously, this is a pretty unlikely thing to manage, so basically you’re left with a scenario where you could equalize the driver, but any team could hand you a car that was purposefully set up badly and you could basically never prove that they had done so.

    • Ramshoek

      January 19, 2018 at 3:53 am

      Sounds like the way BoP is done in GT3.
      But in GT3 despite this BoP system, there are in season BoP adjustments.

      • thomas

        January 19, 2018 at 4:59 am

        Pretty sure the in season BoP adjustments are because SRO has three or four different BoP settings depending on the circuit

  9. Doug P

    January 18, 2018 at 4:37 pm

    Can’t you just see the GTLM podium interview, going something like this;

    ” Welcome the BMW drivers to the podium, well done! At the Roar you seemed so far behind, struggling with pace, yet here you are!”

    ” Yes its true we were way off at the Roar, and we made sure to tell all the press about how our competitors, fearful of our pace, protested and put our new car program behind 6 months. So at the Roar we made sure they noticed that yes, we were seconds off the pace, barely able to beat GTD cars.”

    ” All the credit goes to the guys at the shop over the past 3 weeks. They worked so hard and found a number of things that magically made up the 6 months behind we told everybody that we were placed. And here we are! Ain’t IMSA great!

    • JBV

      January 18, 2018 at 6:48 pm

      Agreed! I wouldn’t be surprised to see the qualify within the top 3.

    • Barber

      January 18, 2018 at 6:53 pm

      I highly doubt the BMWs will last the 24.

    • Tim

      January 19, 2018 at 12:39 pm

      You honestly think that little increase in boost and weight break will be 1.5 seconds? And the gap is actually more like 1.75-2sec because you know for a fact the others brands will always have several tenths in the pocket. We’ve seen BMW given crap BOP for several years now at the 24H and its a shame it looks like it has happened again. Fingers crossed they have some cool fuel saving engine map to snooker everyone at the end somehow 🙂

    • fourloko

      January 19, 2018 at 3:29 pm

      pre roar bop, Post roar boost (bar)

      3500 2.18 2.22
      4000 2.18 2.23
      4500 2.17 2.24
      5000 2.03 2.11
      5250 1.95 2.035
      5500 1.87 1.96
      5750 1.80 1.895
      6000 1.73 1.83
      6500 1.67 1.77
      6750 1.54 1.65
      7000 1.4 1.51

      so they are getting a boost raise of .5-1.5 psi across the spectrum. although they have 14 less liters of fuel compared to the last car.

      • Tim

        January 20, 2018 at 6:05 pm

        Exactly my point. And never ever will an average of 1PSI going to close a 1.5-2 sec gap

  10. nealio

    January 18, 2018 at 4:40 pm

    What is the merit of artificial competition. Victory is meaningless and the sport is killed in a wave of show up and get a trophy nonsense. This is extremely patronizing toward the fans of the sport. It’s disgusting what IMSA and other weak sanctioning bodies are doing to what was a great sport!

    • pdxracefan

      January 18, 2018 at 4:51 pm

      OMG. Trying to ensure the racing is close. The end of the world.

      • JC

        January 18, 2018 at 5:23 pm

        Agree. History has shown time and time again that escalating costs and one-sided competition have been the death knell of racing series. Close competition never has. The manufacturers knew what they were going to be subject to when signing up. If you want to build no holds barred, go into LMP1. That simple.

        • Christian

          January 19, 2018 at 12:32 am

          Case in point, the old Can-Am series. The series would’ve been around for a lot longer if not for Mclaren destroying the competition.

          • TailsLeMans722

            January 19, 2018 at 2:35 am

            Lets not forget the Eagle Toyota’s dominance killing off GTP in the early 90s

          • Targa florio

            January 21, 2018 at 6:36 am

            Funny here in Europe we thought the panzer division destroyed the opposition in can am

  11. fernando

    January 18, 2018 at 5:14 pm

    A 0.6mm smaller air restrictor? So Penske was fighting for a win at Petit, nobody could see where the Nissan’s went at Petit (they had a clear advantage) and let’s not forget that when Extreme Speed won at Daytona and Sebring they had a very clear car advantage. They sandbagged at the Roar-again-just like they have done in the past. Does IMSA ever learn, or they just want to please a sponsor? The race has lost all interest to me and I bet anyone that the Acura’s and Nissan’s will run away with the race. I think I’ll cut my losses and watch from home…

    • thomas

      January 19, 2018 at 5:01 am

      The Daytona/Sebring Extreme Speed car was totally different. Not the same engine, not even the same model of car.

    • thomas

      January 20, 2018 at 7:58 pm

      Penske is running a different car/engine to Petit Le Mans too. The Acura engine is totally different to the Gibson V8

  12. Sir Skidsalot

    January 18, 2018 at 5:15 pm

    What if the Cadillacs were really even faster and were actually sandbagging hoping to get a little BoP just to make it “LOOK” like they were on the up and up. What will the Outraged “Mr. Truth” say if they sweep the front row and the race?

    • Truth

      January 19, 2018 at 8:58 am

      I don’t like the concept of BOP. Success is punished and mediocrity is rewarded. Engineers, drivers, constructors and engine manufacturers should be responsible for pace – not the sanctioning body.

      • Jos

        January 19, 2018 at 11:35 am

        Look bop is here to stay no matter how much you whine. As far back as ive been following imsa there has always been some form of slowing the dominant cars.

  13. Leo

    January 18, 2018 at 5:27 pm

    The other DPI have to build bett

  14. The Fisherman

    January 18, 2018 at 5:33 pm

    One of two things is going to happen at Daytona. Either the Cadillac’s will be able to work around this and still maintain an advantage, or Penske will be removing the sand from their ORECA’s and will spank the field.

  15. Joe C

    January 18, 2018 at 5:50 pm

    Wait we are talking about almost Two seconds faster than last years pole time. Also I am good if a Cadi wins by all means but they need to be on pace with P2 Car something had to be done. I mean as bad as the screwed up the BOP in favor for Cadi last year why would they not start over with a new motor package knowing that it will favor them. Penske is smart as well if they have more pace they will show it in the race not qualifying.

  16. juneracer

    January 18, 2018 at 5:56 pm

    IMSA has a tough job. they get wind tunnel data and engine data for every car. they pulled cars off track to tech them at the Roar, and Dec test, to see who’s dragging there cars down with weight or wing, and have a gillion bytes of data from each car and sector timing to review. they have there hands full. and all this time each manufactures wants to ‘look’ like they’re playing fair and lobby for handouts. is it purest racing? no way. but its the way of the future, unless you want to race in a spec class. does IMSA do a perfect job? no way, not possible. but likely the best of any series. which series does it better?

    • SC

      January 18, 2018 at 10:36 pm

      Its all part of the ‘game’ of racing…

  17. Ben B.

    January 18, 2018 at 6:42 pm

    I don’t know why everyone loses their mind over BoP. If you want to have a series where manufacturers can run the engines that they want AND be able to manage costs, then there needs to be some kind of equivalency formula to keep competition strong.

  18. Kingsnake

    January 18, 2018 at 6:43 pm

    F**king NASCAR. Why not just tell us before the race who the designated winner will be? Seriously, it’s like watching a “reality” competition show. 👎

    • Mo

      January 19, 2018 at 6:33 am

      One, Brian France runs NASCAR, not IMSA, so BOP is not a NASCAR decision. Two, without BOP, you would have a good idea of who the winners might be. So, you should be in favor of a proper BOP, not complaining about it.

  19. Jake

    January 18, 2018 at 6:45 pm

    IMSA haven’t a clue WTF they are doing. They Gave Mazda and Nissan performance increases, even though EVERY single DPi manufacturer was ahead of the fastest Oreca P2 car in qualifying. Spec P2 being the baseline, not a single DPi manufacturer should have been given any concessions to go faster, yet here we are. We can almost guarantee Penske wasn’t showing its full hand, plus Mazda and Nissan were given improvements…… I can see where this goes now.

    I also love that according to the data, the Cadillacs and the 5.5L V8 can go the same distance in a stint on only 68L of fuel, while Nissan and Acura need 80L to get the same distance?

    • jack

      January 18, 2018 at 10:38 pm

      they also had aero adjustments, which could mean more drag, which would slow them down. lets assume the people at imsa, who have real time data sensors on the cars, which means they can see throttle position and when they break and get on the gas, know what they are doing.

      • Jake

        January 19, 2018 at 11:27 am

        You ever hear the saying “you know what happens when you assume? You make an ass of you and me”?

        IMSA isnt new, and we’ve seen manufacturers mess with BOP for their benefit every year. They have data, but its still easily manipulated.

  20. Bjones

    January 18, 2018 at 7:00 pm

    As long as you have racing, you’ll have creative interpretation of the rules, IMSA tries to BOP, then the engineers look and eventually find a hole to climb into. AS for using a testing driver, totally disagree, if you want go cart racing then go to the local park. This is the beauty of racing, here is the rules go build a car, you (car builder) build your speed racer and find out it is either the fastest thing on earth and IMSA spanks you or it turns out to be an anvil, then you work on it and get it right, find a hole and wait for IMSA to spank your butt because you found the hole before they did. Its called the beauty of racing. Sometimes your the bug, sometimes your the sole of the shoe.

  21. Richard Reeves

    January 18, 2018 at 7:24 pm

    Fact: F1 remains the one prime example of motorsport that does not employ BOP or other adjustments.
    Fact: F1 is a twenty times (conservative estimate) more poplular world-wide than IMSA or the WEC or other forms of sports car racing (all put together)
    Fact: BOP & its European equivalent are manifestations of a socialist ideal to “level the playing field”
    Question: If BOP and its equivalent are such Great Ideas why is attendance and viewership of sportscar racing such a pale shadow of F1 (aside from Le Mans)?
    Fact: BOP runs counter to the ideal that the best & brightest will rise to the top against those who are less talented: a supreme form of Socialism, if not Communism.
    Deal in FACTS, people, not your “fake news” and BS opinions…And enjoy the “spectacle” of a paltry few tens of thousands at Daytona in late January.

    • daedalus

      January 18, 2018 at 7:55 pm

      F1 is more popular than Sportscar racing for historical reasons as well as the fact that casual fans don’t have the attention spans to watch endurance racing. Even when Sportscar racing had no BOP it was still a niche motorsport compared to F1 and NASCAR. BOP does level the playing field and that’s a good thing not bad as it gives good racing and allows the most talented drivers to win rather than average drivers wining because they had the best cars, a la F1.

      • Haskellb

        January 18, 2018 at 8:16 pm

        Actually in the late 80’s Group C had popularity on par with F1 so of course the Fédération Imbécile de l’Automobile killed it.

        • kv

          January 21, 2018 at 3:59 pm

          Perfect acronym for FIA !

    • Mo

      January 18, 2018 at 8:34 pm

      Fact: sportscar racing has the best racing on the planet right now. Fact: F1 is oftentimes boring and predictable (overrated) Fact: Motorsport being compared to socialism and communism is ignorant and plain stupid. Fact: The best and the brightest will rise to the top with or without BOP, and, it’s also true that the brightest and most talented oftentimes don’t rise to the top without the connections and money.

    • Barber

      January 18, 2018 at 10:40 pm

      Why do you say “BOP & its European equivalent” as if BoP was created by IMSA, you know it started from SRO in Europe right.

    • Matt

      January 18, 2018 at 11:40 pm

      Sports car racing has never had the same popularity as F1…. you can always tell an ignorant Republican by their hilarious use of the term “fake news”. You guys really enjoy being a laughingstock, don’t you? For the record, I use my brain and am independent of any party.

    • Ug-Min Lahk

      January 19, 2018 at 7:01 am

      Just another fact: the manufacturers are the first to admit BOP is necessary, especially in the GT categories. It’s the only way to guarantee that different car concepts are able to compete together.

    • Jos

      January 19, 2018 at 11:40 am

      Fact f1 is voring as hell.

  22. daedalus

    January 18, 2018 at 7:40 pm

    It was obvious with every caddy ahead of every other p2/dpi in the pit spot qualy that they were going to be pegged back. People should stop whining about the BOP changes, without BOP where you finish would be determined by how much money you have to develop your car. You only need to look at f1 where only 4-6 cars out of 20 have a realistic attempt at winning and the others are just also rans, it ends up with boring racing and becomes a business rather than a sport.

    They could improve the BOP by making it more transparent to everyone, for example adopting the Auto BOP that WEC uses for GTE to take the human bias out of the decisions.

    BOP is here to stay and motor racing is better off because of it with close racing and bumper grids without the need to spend mega bucks to be competitive.

  23. gmfansblow

    January 18, 2018 at 9:05 pm

    It’s funny how the GM morons conveniently forget that NASCAR said from the VERY BEGINNING that the WEC P2 cars would be the performance baseline.

    Just ignore that FACT and whine like little girls when they finally get around to living up to that statement a year later.

    And, as others have pointed out, unlimited budgets, speeds, aero, etc have killed many series including CamelGT back in the day.

    And some of you that talk about what was “once a great sport” are probably 20 years old and have no idea what road racing has been about for a long time.

  24. SC

    January 18, 2018 at 10:43 pm

    BOP isn’t perfect, but its part of the game. Its an ebb and flow, you win some you lose some. Showing enough to fly under the radar, while remaining competitive is key. IMSA has all the data so its not like you can really sandbag too much, but there are ways to hold back and not go 10/10s. Qualifying will show what we’re dealing with, and I for one will be there at the finish line to see which team plays the game the best.

  25. Matt

    January 19, 2018 at 12:10 am

    Uma sandbagging XD

  26. Mike S

    January 19, 2018 at 3:26 am

    One BoP adjustment before lap one of race #1 and everyone is excited. Like this is year one of BoP that just began. We don’t like it but deal with it. It’s necessary evil in this series and it’s a long season.

  27. Davy

    January 19, 2018 at 7:51 am

    I don’t think anything malicious is going on. IMSA’s people should know if somebody is sandbagging or not, they do more than just look at laptimes. If the Acuras were going at 90% throttle or something like that it would show up on the telemetry. I don’t like BOP either, but it is what it is. All the necessary safety features have made racing very expensive. There is also the disappearance of tobacco sponsorship which used to be a big funder of racing.

  28. N8

    January 19, 2018 at 8:26 am

    You had to know there would be an adjustment after a change in powerplant. I mean, come on people.

    In the grand scheme of things, they’re in a better place with the smaller restrictors than they were with gear ratio mandate, plus they got more fuel.

  29. DEJ

    January 19, 2018 at 10:07 am

    The Caddys will win and lead the race. GM has had years learning how to play the game with the Corvettes.

  30. CarbonRocks

    January 19, 2018 at 11:26 am

    IMSA: Ok Teams, run as hard as you can. Then we can take away any performance advantages you have, so WE can put on a good show. In our words, do our job for us. Also, if you don’t run as hard as you can, we’ll get mad, and maybe stack the BOP against you.
    Teams: So, if we go fast you will screw us, and if we go slow you’ll screw us.
    IMSA: Yep
    Teams: Ok, so I have to go just fast enough to look like I’m helping you, but it’s not in my best interest to go any faster.
    IMSA: …I don’t understand, just go as fast as you can
    Teams: Yeah, right, that’s what we’ll do…

  31. Chips O'Toole

    January 19, 2018 at 5:48 pm

    Here’s hoping the race is more exciting than the BOP discussions. One can dream…..

  32. Louis

    January 19, 2018 at 6:13 pm

    Damn it I need more popcorn

  33. JaymondoGB

    January 22, 2018 at 6:44 am

    Even if its a newer version of the Dinosaur V8, it has no place in modern LMP. I was hoping IMSA were going to “BOP” this thing out of existance, and force GM to make a more modern Turbo V6 or something.

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