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Justin Barber

New features: preferred reports, glossary, car overviews

Lap Raptor has added some new features. I find them useful! User accounts are useful By signing up for Lap Raptor, you can now set preferences on what your preferred reports are. The two most popular pages are the Drivers stats list and the race pages, so you can now

Cup Series Recap: 2021 Blue-Emu Maximum Pain Relief 500 (Martinsville Speedway)

Martin Truex Jr. won a thrilling 500-lap race with an impressive ARP of 3.88 and a notable GR-LR of 3.74. Despite Denny Hamlin leading 406 laps, late-race cautions led to his third-place finish. Chase Elliott finished second.

Xfinity Series Recap: 2021 Cook Out 250 (Martinsville Speedway)

Josh Berry clinched victory from 29th position with a stellar average running position of 5.93 and a net gain rating of 4.09. His lead from Lap 78 to Lap 250 set the race dynamics, edging out Noah Gragson and Daniel Hemric.

Cup Series Recap: 2021 Folds of Honor QuikTrip 500 (Atlanta Motor Speedway)

Ryan Blaney clinched victory after leading the final 9 laps with an impressive ARP of 2.77. Despite leading 292 laps, Kyle Larson finished 2nd. Alex Bowman showed significant improvement, finishing 3rd.

Xfinity Series Recap: 2021 EchoPark 250 (Atlanta Motor Speedway)

Justin Allgaier clinched victory from 6th with strong metrics and a net gain rating of 2.67. Martin Truex Jr., despite leading 108 laps, finished second. The race featured seven caution flags, reshaping the outcome.

Cup Series Recap: 2021 Instacart 500 (Phoenix Raceway)

Martin Truex Jr. wins after starting fifth, finishing first with an ARP of 5.58. Joey Logano, leading most of the race, finishes second. Denny Hamlin maintains top rankings and finishes third. Brad Keselowski ends fourth.

Feature update: retention tweaks, and a note on average running position

First update: the maximum denominator of the retention score weights is now 20 instead of 10 to better represent the realities of the sport. The top twenty cars are competing for playoff spots. 10 and 20 are equally arbitrary, but 20 has that backing it. The original post has been

Lap Raptor explained: Retention, gain and loss ratings

Lap Raptor offers two types of retention report: cumulative and per 100 laps. Let's address the columns in chunks, discuss what each stat is useful for and how we can develop a better retention metric that may have predicted the 2020 Champion.

New feature: driver race pages

A quick note on a new feature: We've added pages for driver pages at individual races. You can access these from driver pages and race pages. This links to Chase Elliott's championship win. The page has a graph of all that driver's lap times

Lap Raptor Explained: Speed Score

It's difficult to devise catch all metrics for composite processes. The goal in autoracing is to win races, and the simplest way to do so is to drive faster than everyone else - but driving faster means a lot of things. You can give it 100% all day,