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Bozi Tatarevic Profile picture
Bozi Tatarevic
@BoziTatarevic
I run in front of race cars professionally and create motorsport content. Champion Racing Mechanic | Writer @RoadandTrack @Motorsport | Presenter | Dessert Fan
2 subscribers
Feb 19 • 21 tweets • 7 min read
The No. 19 of Chase Briscoe was hit with a large penalty for modification of a single source supplied
part under the following sections of the rulebook:

-Sections 14.1.C&D&S: Overall Assembled Vehicle
Rules
-Section 14.5.8.A: Spoiler

Let's dig into the details of the parts. Image Cup series cars are required to run a 7″ x 60″ spoiler face (F) on a tall spoiler base (E) for superspeedway races which is shown on the bottom half of this illustration. Image
Feb 14 • 15 tweets • 4 min read
We saw that pit crew members from @JoeGibbsRacing had tablets that would light up in green as a car reached its fuel fill target to tell the driver and fueler that the car can take off.

Let's dig into how this works and how they choose the time when it should change colors. Image In this video we see a fuel only pit stop on the No. 11 of Denny Hamlin in the Duels last night.

Due to the distance of the race being so short, the car does not need a full fill of fuel so teams try to predict exactly how much fuel to add in order to maximize track position.
Feb 11 • 17 tweets • 5 min read
NASCAR has added torque sensor details to the rule book.

Ramping up testing with torque sensors is a significant step towards possibly allowing new engine types which could potentially lead to a new OEM.

Let's get into the details of how it all works and what it means. Image A very simplified way to explain a torque sensor is that it is like a mobile dyno because the sensor is mounted on the driveshafts/axles leading to the wheels which allows it to calculate a torque output figure at the wheels. Image
Feb 10 • 12 tweets • 5 min read
The car that Kendrick Lamar used on stage last night at the Super Bowl half time show is a real Buick Grand National.

Let's dig into some of the details and see where it came from and how it was modified. Image My search for the car started with this great story from @WaterSlicer that gave me a hint of the car being for sale in Riverside, CA at some point.

wired.com/story/true-sto…Image
Feb 10 • 12 tweets • 5 min read
Kendrick Lamar owns an authentic 1987 Buick GNX.

GNX stands for Grand National Experimental and only 547 were built. Kendrick owns number 191.

He is deeply ingrained in Grand National lore and has even mentioned internal GM build codes for the GNX in the past. Image From a post announcing the purchase of his GNX:

"make you realize the only thing that matters in life is that original paper work. that TL2 code"

T2L was an internal GM RPO code that marked a Grand National destined to be turned into a GNX. Image
Oct 1, 2024 • 12 tweets • 5 min read
Listening to Actions Detrimental and feel like @dennyhamlin might need a whiteboard for a technical explainers to @jareddallen and @TravisRockhold.

Here is a good illustration to add to his explanation on why Xfinity cars can get close and pass but Cup cars can't. Image If you look at the car when they're far apart, you can see how the air comes off the spoiler of the leading car and and also how the following car can get air under the splitter. The cars will be somewhat comparable in how they perform in these situations. Image
Aug 21, 2024 • 10 tweets • 4 min read
I do not see a way that having the lifter system installed could have any impact on the right rear droop so I don't believe that it played any role in the LaJoie flip.

Calling it an air jack is incorrect as this is a lifter system that can temporarily increase damper length. I know that the air jack terminology was used on the segment segment in the show but it is incorrect and will cause confusion if people keep repeating it. It's best to refer to it as a damper lift system or shock lift system..
Aug 12, 2024 • 9 tweets • 4 min read
There have been a lot of opinions on the moves by Austin Dillon on the last lap but best way to analyze them is to look at the actual data so let's dig into his last two laps in a quick thread.

Orange = Lap 407
Blue = Lap 408 In order to get an understanding of what we're looking at we'll start with Dillon's moment of impact with Logano.

If you look on the chart on the right you'll see that Dillon was moving at 105.2 mph and had 30.9 degrees of steering to the left at the moment marked. Image
Mar 3, 2024 • 9 tweets • 4 min read
The right front wheel on the No. 17 was not fully tight which resulted in the wheel riding at an angle on the hub and eventually snapping. Let’s dig into how that happens.
During a tire change, the wheel has holes on the back of it that need to seat on drive pins that are on the center of the hub around the snout. Image
Feb 11, 2024 • 8 tweets • 4 min read
Ever wonder what all those buttons and knobs on a race car's steering wheel do?

The steering wheels in our Lexus RC F GT3s have a over a dozen functions and are the command center for our drivers. Let's dig into some of them and how they're used during a race. A photo looking at the steering wheel and dashboard of the Lexus RC F GT3. The top of the steering wheel features three knobs:

TCS: Sets the level of traction control intervention.

GEAR: Sets the mapping for the gearbox and adjusts throttle blip.

ENG: Sets how the car responds to throttle input dependent on a driver’s preference and conditions Image
May 9, 2023 • 5 tweets • 2 min read
Checking out some pit lane stats for Trucks at Kansas and just like in Cup, having that first pit stall is an advantage for driver time on pit lane.

Having an open in or out also appears to be an advantage.

Here are top 15 drivers based on average pit lane time: Image An experienced driver in the first pit stall can be a huge advantage. The gap from 1st to 2nd is 0.74 seconds but the gap from 2nd to 3rd is only 0.01 seconds.

5th place is over a second behind best.
15th place is over two seconds behind best. Image
May 9, 2023 • 6 tweets • 3 min read
Looking at average driver time on pit lane during the Darlington race last year and out of the 10 fastest drivers only one didn't have an opening either going in or coming out of their pit stall.

The first stall has a huge advantage but openings are helpful even down the line. Image Those top 10 fastest drivers on pit lane from last years Darlington spring race marked on the pit stall chart. Image
May 8, 2023 • 11 tweets • 4 min read
Here is a comparison of a legal splitter stay versus the illegal one that resulted in a penalty for the No. 3 car based on the photos released by NASCAR.

You can see the two nuts that are bonded to the turnbuckle which resulted in the penalty. Image There appears to be epoxy applied at these two joints in order to bond the nuts to the turnbuckle. This would allow the nuts and turnbuckle to move as one assembly instead of having the nuts jam against the turnbuckle to hold it in place. Image
May 7, 2023 • 4 tweets • 2 min read
Hamlin versus Larson lap time differentials during the race so far.

You can see that that Hamlin's car rolled off the truck with a better setup but Larson's car got a lot closer after the first set of adjustments. Image Hamlin versus Larson lap times from Lap 11 to Lap 38. Image
May 7, 2023 • 4 tweets • 2 min read
Hamlin pit stops so far.

Blue = Driver time to pit box
Red = Pit stop time in box
Orange = Driver time out of box Image The numbers. Image
Nov 28, 2022 • 16 tweets • 6 min read
If you've ever taken a peek at engine bay of a Lexus RC F GT3 and wondered what's inside the large carbon fiber box on top, you'll be pleased to learn that it houses individual throttle bodies that are mounted to the cylinder heads of the 2UR-GSE V8 race engine. Image The carbon fiber trumpets that lead to those ITBs can be seen clearly in this side view photo from TGR. Image
Sep 6, 2022 • 36 tweets • 10 min read
We can absolutely dig into the fire of the No. 4 at Darlington and explain some of the possibilities and contributing factors. Thread incoming. A ball of flame appears from the right front wheel opening o To understand what contributes to these fires we have to go back to one of the driver cooling fixes that were done to lower the temperature of the footwell/pedal box which is directly beside the rocker box and where the exhaust comes off the car.
May 30, 2022 • 14 tweets • 6 min read
The No. 17 car took a wild tumble during the Coca-Cola 600 but even though the incident looked intense, the safety features of the NASCAR Next Gen appear to have worked as designed and the driver was well protected based on my brief inspection of the car last night. My thread from the incident here with some details of what was going on as it hapenned.
May 30, 2022 • 5 tweets • 2 min read
The No. 11 boys waiting out those last couple of laps. A few minutes later.
May 30, 2022 • 6 tweets • 2 min read
Wow. That was wild. From what I can tell, the impact from the 99 caused the upper control arm to break on the No. 17 and then as the car slid on the grass the wherl got pulled under the car because the top wasn’t being held in place.
May 29, 2022 • 4 tweets • 2 min read
Very excited to root for my key lime pie guy @KKirkwoodRacing in the Indy 500 today. @KKirkwoodRacing Pie review in this thread.