Bozi Tatarevic Profile picture
Oct 26, 2021 25 tweets 12 min read Read on X
Quick thread on my first visit to @MillbridgeRacin for the @Walkapedia_ Carolina Midget Showdown.
The main parking area was full by the time I got to @MillbridgeRacin so had to enter the back lot which felt like I was going on an adventure.
It was interesting to see the paddock layout and the interactions of the competitors once inside.
It started sprinkling so teams moved their cars out of the rain.
I was chatting with @BrianRDunlap and @Walkapedia_ while waiting for the rain to pass and an impromptu race procedure meeting just happened in front of us which eventually resulted in a driver meeting being called to discuss re-qualifying after the rain.
. @BrianCarter6 dropping by and checking weather radar with @BrianRDunlap and @Walkapedia_.
. @dillon_welch brought Janet.
Janet is cool.
I grabbed a Walking Taco after @FreddieKraft recommended it and it was delicious.
Concession prices at @MillbridgeRacin are very reasonable.
There’s all kinds of cool stuff around the paddock like this @BuiltBundy Honda K-Series motor that revs to over 9,000 RPM.
Some of the most competitive races of the night seemed to be the box stock races that kids were running.
A decent amount of NASCAR Cup series drivers were around at @MillbridgeRacin as well but @KyleBusch and @KurtBusch were wrenching last night rather than racing.
Other NASCAR Cup Series playoff contenders like @KyleLarsonRacin were in the area as well doing similar dad/mechanic duties.
These kids races were the only ones that had post-race tech and from what I hear the engine building and technical competition is pretty intense in this class.
Cool truck in the lower paddock.
It was nice to be invited to then infield for the feature to see all the cars up close.
The push vehicles are pretty neat.
There was a quick pre-race media meeting in the infield.

I feel like this is the 37th type of racing event this yesr where I’ve run into @HannahNewhouse working a broadcast.
Sseing these things being wheeled from up close is incredible.
It was cool to see team owners like @Alex_Bowman out there wrenching on their race cars and I was appreciative of the explanations that he shared on what they were doing in addition to what @BrianRDunlap was showing me.
That ABR entry piloted by @CJ_Leary_ eventually ended up in victory lane.
Second place finisher @CBellRacing was out inspecting the track immediately after the finish and debriefing with his crew.
My @KnightsBaseball hat shows the amount of dirt that I experienced during the event.
There's more racing tonight and more prize money on the line at @MillbridgeRacin so y'all should go check out the second night of the @Walkapedia_ Carolina Midget Showdown!

Gates open at 5pm and hot laps start at 6:30pm.

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More from @BoziTatarevic

Feb 19
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
NASCAR runs such a large spoiler base in order to slow the cars down and teams obviously want to find ways to make speed so getting air away from the spoiler is a priority whenever possible but NASCAR tries to make sure that the spoilers cannot flex through multiple methods. Image
Read 21 tweets
Feb 14
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.
In the first part of the stop, we see the fueler approach the car and as soon as he plugs in, the crew member at the front of the car presses a button to start the timer on the tablet. The timer starts with a yellow bar that counts down and turns green at a predetermined time. Image
Read 15 tweets
Feb 11
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
Once a car is moving, the driveshaft produces a magnetic field which is detected by the torque sensor surrounding it. That magnetic field is converted to measurable voltage which corresponds to a given torque figure that can be transmitted over the cars data system. Image
Read 17 tweets
Feb 10
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
I did a little digging and noticed that there is small used car lot called Effortless Motors in Riverside, CA that specializes in specialty cars and has 5-10 cars in inventory at any given time. Their Instagram shows a 1987 Grand National for sale late last year. Image
Read 12 tweets
Feb 10
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
Those 547 Grand Nationals were sent to American Specialty Cars (ASC) McLaren Performance Technologies where they got a big turbo and big intercooler among other upgrades.

They can easily be identified by the GNX turbo heat shield as seen in one of the photos in the post above. Image
Read 12 tweets
Oct 1, 2024
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
Once the cars get close, we can see the airflow from the leading car now joins the airflow from the following car which takes air away from the spoiler of the leading car. Which results in a loss of downforce for an overbody dependent car like the Xfinity car. Image
Read 12 tweets

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