Best of Gen 6: Recognizing the era’s best restarters


From the start of the 2013 season to the close of last month’s finale in Phoenix, the NASCAR Cup Series experienced the era of the Gen 6 car. With this chapter of stock car racing at its bittersweet end — and a new one beginning with the introduction of the Next Gen car in 2022 — NBC Sports is spending this month looking back on the best individual performances across the last nine years.

Who were the best restarters of the Gen 6 era?

To identify the most capable movers within the two laps following each restart, we’ve sought out each driver’s position retention rate, or more informally, the rate in which they maintain their position on a restart. From here, a few names are common fixtures among the year-end rankings.

The rankings within each capsule refer to a driver’s year-end ranking in position retention rate across restarts from inside the first seven rows:

Joey Logano

Rankings: 2nd (2014, 2015), 3rd (2019), 6th (2021), 7th (2013, 2020), 9th (2016, 2017, 2018)

While there certainly were indelible Logano restarts — he successfully fended off a herd of title contestants for a 2016 victory in Phoenix that catapulted him into the Championship 4 the following week — the Connecticut native more routinely crushed with consistency. He never ranked as the best restarter in any singular season within the Gen 6 era but he was the only driver to rank inside the top 10 for position retention each year. It’s an impressive feat, a reliability that’s become his calling card.

His banner years of 2014-15 brought respective retention rates of 78.51% and 75.75%, resulting in a net gain of 111 positions. Spots he earned within those two-lap windows accounted for nearly 49% of his two-year adjusted pass differential (+228) in what served as the era’s most productive seasons for any driver aged 24 or 25 years.

Kurt Busch

Rankings: 1st (2016, 2018), 3rd (2013, 2014, 2015), 4th (2017), 8th (2020)

Busch’s reputation for restarting now precedes him, based on moments worthy of inclusion on any highlight reel and for the sheer dominance in this specific statistical category across 2013-18. During this six-year stretch, Busch twice ranked first in overall retention (2016 and 2018) and retention specifically from the non-preferred groove (2014 and 2018). His 41-position net gain out of the non-preferred groove from 2013-15 was greater than the combined net of all other drivers during the time frame.

His knack for the short runs was built during the high-horsepower days predating the choose rule. But this skill crept into the modern rules landscape last year when he again ranked first in position retention from the non-preferred groove and was one of just two full-time drivers (along with Ryan Blaney) to successfully defend position on over half of such attempts from inside the top 14.

Kevin Harvick

Rankings: 1st (2014, 2015), 4th (2013, 2016), 5th (2017), 6th (2019), 8th (2018)

It stands to reason that the driver who benefited from the Gen 6 era more than any other proved dominant on restarts. And Harvick was indeed dominant; in fact, from 2014-15 specifically, there was no better restarter.

In his title-winning season of 2014, Harvick retained his position on restarts a series-best 80.09% of the time. He bested that effort the next year with an 83.6% rate that served as the best single-season clip of the entire era. Across both seasons, his immediate return on restarts yielded 141 positions on the track, roughly 26% of a two-year adjusted pass differential (+544) that made him one of the most efficient overall passers in the same time frame.

Brad Keselowski

Rankings: 2nd (2018, 2019), 3rd (2020), 5th (2013), 7th (2014, 2021), 8th (2017)

Some of Keselowski’s individual performances on restarts may be more pronounced than his cumulative output, but that’s only because his most celebrated efforts produced an impressive outlay. Across the entire era, the three biggest gains on any restart all belong to Keselowski: He earned 18 spots on a single restart in 2017 at Kansas, 17 on a single bid from Las Vegas this year and 17 in one restart window at Talladega four years ago.

But he paired sensibility with his sizzle, ranking inside the top 10 for retention in seven of the nine Gen 6 seasons, including 2021. He ranked second — his high point — across 2018-19, a span comprised of two radically different rules packages.

Martin Truex Jr.

Rankings: 1st (2019, 2020), 2nd (2017), 3rd (2021), 6th (2015, 2016), 7th (2018)

Truex’s short-run prowess is elite, more so than his overall passing acumen beyond the restart window. His retention rate on restarts ranked seventh or better in each of the last seven seasons while his ability to overtake — as he did earlier this season at Phoenix in a devilish dive past Logano — proved useful in several wins for both Furniture Row Racing and Joe Gibbs Racing.

His years atop the list were 2019-20, in which he earned a nine-position net gain, the most of any driver across the two seasons. He also showcased a defensive ability that resulted in dependable loss mitigation: His 0.62-position net loss per non-preferred groove restart in 2020 ranked first in the series, 0.2 spots per attempt better — and worth an additional position every five restarts — than the next-best driver.

Kyle Larson

Rankings: 1st (2017, 2021), 4th (2019), 5th (2016, 2014), 6th (2018)

It’s probably not a shock that the 2021 title-winner is included here but respect the trajectory: Larson was a top-five restarter in his rookie year.

He’s only improved with age, leading the Cup Series in retention rate in both 2017 and 2021. This year, he held steady on restarts 76.77% of the time when launching from inside the top 14, the high-water mark of the low-horsepower years. His net loss on non-preferred groove attempts this season was a mere 0.11 positions on non-drafting tracks. He was virtually untouchable on short runs, especially when restarting from the front row, where he retained position over 85% of the time.

Restarts tend not to favor the young — at age 29, Larson is the youngest driver on this list — so the fact that he’s been an efficient short-run traffic navigator since his very first Cup Series start makes for another accolade among his many accomplishments.

Dr. Diandra: How level is the playing field after 50 Next Gen races?


Last weekend’s Coca-Cola 600 marks 50 Next Gen races. The 2022 season produced 19 different winners, including a few first-career wins. Let’s see what the data say about how level the playing field is now.

I’m comparing the first 50 Next Gen races (the 2022 season plus the first 14 races of 2023) to the 2020 season and the first 14 races of 2021. I selected those two sets of races to produce roughly the same types of tracks. I focus on top-10 finishes as a metric for performance. Below, I show the top-10 finishes for the 13 drivers who ran for the same team over the periods in question.

A table comparing top-10 rates for drivers in the Gen-6 and Next Gen cars, limited to drivers who ran for the same team the entire time.

Because some drivers missed races, I compare top-10 rates: the number of top-10 finishes divided by the number of races run. The graph below shows changes in top-10 rates for the drivers who fared the worst with the Next Gen car.

A graph showing drivers who have done better in the next-gen car than the Gen-6 car.

Six drivers had double-digit losses in their top-10 rates. Kevin Harvick had the largest drop, with 74% top-10 finishes in the Gen-6 sample but only 46% top-10 finishes in the first 50 Next Gen races.

Kyle Larson didn’t qualify for the graph because he ran only four races in 2020. I thought it notable, however, that despite moving from the now-defunct Chip Ganassi NASCAR team to Hendrick Motorsports, Larson’s top-10 rate fell from 66.7% to 48.0%.

The next graph shows the corresponding data for drivers who improved their finishes in the Next Gen car. This graph again includes only drivers who stayed with the same team.

A graph showing the drivers who have fewer top-10 finishes in the Next Gen car than the Gen-6 car

Alex Bowman had a marginal gain, but he missed six races this year. Therefore, his percent change value is less robust than other drivers’ numbers.

Expanding the field

I added drivers who changed teams to the dataset and highlighted them in gray.

A table comparing top-10 rates for drivers in the Gen-6 and Next Gen cars

A couple notes on the new additions:

  • Brad Keselowski had the largest loss in top-10 rate of any driver, but that may be more attributable to his move from Team Penske to RFK Motorsports rather than to the Next Gen car.
  • Christopher Bell moved from Leavine Family Racing to Joe Gibbs Racing in 2021. His improvement is likely overestimated due to equipment quality differences.
  • Erik Jones stayed even, but that’s after moving from JGR (13 top-10 finishes in 2020) to Richard Petty Motorsports (six top 10s in 2021.) I view that change as a net positive.

At the end of last season, I presented the tentative hypothesis that older drivers had a harder time adapting to the Next Gen car. Less practice time mitigated their experience dialing in a car so that it was to their liking given specific track conditions.

But something else leaps out from this analysis.

Is the playing field tilting again?

Michael McDowell is not Harvick-level old, but he will turn 39 this year. Ricky Stenhouse Jr. is 35. Both have improved with the Next Gen Car. Chase Elliott (27 years old) and William Byron (25) aren’t old, either, but their top-10 rates have gone down.

Drivers running for the best-funded teams earned fewer top-10 finishes while drivers from less-funded teams (mostly) gained those finishes.

Trackhouse Racing and 23XI — two of the newest teams — account for much of the gains in top-10 finishes. Ross Chastain isn’t listed in the table because he didn’t have full-time Cup Series rides in 2020 or 2021. His 9.1% top-10 rate in that period is with lower-level equipment. He earned 27 top-10 finishes in the first 50 races (54%) with the Next Gen car.

This analysis suggests that age isn’t the only relevant variable. One interpretation of the data thus far is that the Next Gen (and its associated rules changes) eliminated the advantage well-funded teams built up over years of racing the Gen-5 and Gen-6 cars.

The question now is whether that leveling effect is wearing off. Even though parts are the same, more money means being able to hire the best people and buying more expensive computers for engineering simulations.

Compare the first 14 races of 2022 to the first 14 of 2023.

  • Last year at this time, 23XI and Trackhouse Racing had each won two races. This year, they combine for one win.
  • It took Byron eight races to win his second race of the year in 2022. This year, he won the third and fourth races of the year. Plus, he’s already won his third race this year.
  • Aside from Stenhouse’s Daytona 500 win, this year’s surprise winners — Martin Truex Jr. and Ryan Blaney — are both from major teams.

We’re only 14 races into the 2023 season. There’s not enough data to determine the relative importance of age versus building a notebook for predicting success in the Next Gen car.

But this is perhaps the most important question. The Next Gen car leveled the playing field last year.

Will it stay level?

NASCAR weekend schedule at World Wide Technology Raceway, Portland


NASCAR’s top three series are racing this weekend in two different locations. Cup and Craftsman Truck teams will compete at World Wide Technology Raceway at Gateway, and the Xfinity Series will compete at Portland International Raceway.

World Wide Technology Raceway at Gateway (Cup and Trucks)

Weekend weather

Friday: Partly cloudy with a high of 87 degrees during Truck qualifying.

Saturday: Sunny. Temperatures will be around 80 degrees for the start of Cup practice and climb to 88 degrees by the end of Cup qualifying. Forecast calls for sunny skies and a high of 93 degrees around the start of the Truck race.

Sunday: Mostly sunny with a high of 92 degrees and no chance of rain at the start of the Cup race.

Friday, June 2

(All times Eastern)

Garage open

  • 1 – 8 p.m. Craftsman Truck Series
  • 4 – 9 p.m. Cup Series

Track activity

  • 6 – 6:30 p.m. — Truck practice (FS1)
  • 6:30 – 7:30 p.m. — Truck qualifying (FS1)

Saturday, June 3

Garage open

  • 8 a.m. – 12:30 p.m.  — Cup Series
  • 12:30 p.m. — Truck Series

Track activity

  • 10 – 10:45 a.m. — Cup practice (FS1, Motor Racing Network, SiriusXM NASCAR Radio)
  • 10:45 a.m. – 12 p.m. — Cup qualifying  (FS1, MRN, SiriusXM NASCAR Radio)
  • 1:30 p.m. — Truck race (160 laps, 200 miles; FS1, MRN, SiriusXM NASCAR Radio)

Sunday, June 4

Garage open

  • 12:30 p.m. — Cup Series

Track activity

  • 3:30 p.m. — Cup race (240 laps, 300 miles; FS1, MRN, SiriusXM NASCAR Radio)


Portland International Raceway (Xfinity Series)

Weekend weather

Friday: Mostly sunny with a high of 77 degrees.

Saturday: Mostly sunny with a high of 73 degrees and no chance of rain around the start of the Xfinity race.

Friday, June 2

(All times Eastern)

Garage open

  • 6-11 p.m. Xfinity Series

Saturday, June 3

Garage open

  • 10 a.m.  — Xfinity Series

Track activity

  • 11:30 a.m. – 12 p.m. — Xfinity practice (No TV)
  • 12 – 1 p.m. — Xfinity qualifying (FS1)
  • 4:30 p.m. — Xfinity race (75 laps, 147.75 miles; FS1, Motor Racing Network, SiriusXM NASCAR Radio)

NASCAR Cup playoff standings after Coca-Cola 600


The severe penalty to Chase Briscoe and his Stewart-Haas Racing team Wednesday for a counterfeit part dropped Briscoe from 17th to 31st in the season standings. Briscoe now must win a race to have a chance at the playoffs.

The penalty came a day after NASCAR suspended Chase Elliott one race for his retaliation in wrecking Denny Hamlin in Monday’s Coca-Cola 600. Elliott is 28th in the points. The 2020 Cup champion also needs to win to have a chance to make the playoffs.

Ten drivers have won races, including Coca-Cola 600 winner Ryan Blaney. That leaves six playoff spots to be determined by points at this time. With 12 races left in the regular season, including unpredictable superspeedway races at Atlanta (July 9) and Daytona (Aug. 26), the playoff standings will change during the summer.

Among those without a win this season are points leader Ross Chastain and former champions Kevin Harvick, Brad Keselowski and Elliott.

Here’s a look at the Cup playoff standings heading into Sunday’s Cup race at World Wide Technology Raceway in Madison, Illinois. Drivers in yellow have won a race and are in a playoff position. Those below the red line after 16th place are outside a playoff spot in the graphic below.

NASCAR issues major penalties to Chase Briscoe team for Charlotte infraction


NASCAR fined crew chief John Klausmeier $250,000 and suspended him six races, along with penalizing Chase Briscoe and the No. 14 Stewart-Haas Racing team 120 points and 25 playoff points each for a counterfeit part on the car.

The issue was a counterfeit engine NACA duct, said Elton Sawyer, NASCAR senior vice president of competition, on Wednesday. That is a single-source part.

MORE: Updated Cup playoff standings

The team stated that it accepts the L3 penalty.

“We had a quality control lapse and a part that never should’ve been on a car going to the racetrack ended up on the No. 14 car at Charlotte,” said Greg Zipadelli in a statement from the team. “We accept NASCAR’s decision and will not appeal.”

Asked how then piece could have aided performance, Sawyer said Wednesday: “Knowing the race team mentality, they don’t do things that would not be a benefit to them in some way, shape or form from a performance advantage.”

The penalty drops Briscoe from 17th in the season standings to 31st in the standings. Briscoe goes from having 292 points to having 172 points. He’ll have to win to make the playoffs. Briscoe has no playoff points at this time, so the penalty puts him at -25 playoff points should he make it.

Briscoe’s car was one of two taken to the R&D Center after Monday’s Coca-Cola 600 for additional tear down by series officials.

The penalty comes a day after NASCAR suspended Chase Elliott one race for wrecking Denny Hamlin in last weekend’s race at Charlotte Motor Speedway.