'21 Generation 7 Car news

2 Sweet said:
Are they unstable only in traffic? Unstable only with the 670 package? Or just unstable altogether?

I'm guessing it's the latter since they seem to be losing control when nobody is around them? I haven't had a chance to follow along, stupid work getting in the way
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Unstable period. Really short deck lid with HUGE rear window. That's why they run such a big spoiler too. I'm fairly impressed with the progress.
 


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Kurt is already looking pretty good in the 23XI Toyota. Bowman looked good in the 9 car.
 
StandOnIt said:
It's real close to the Xfiniti cars in speed, almost as fast, three tenths slower. After the crews get the car for awhile they will find even more speed I bet.
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That's pretty good considering these cars are symmetrical. A lot of speed with nothing to lean on
 
Nitro Dude said:
Kurt is already looking pretty good in the 23XI Toyota. Bowman looked good in the 9 car.
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Kurt is going to put a lot of heat on Bubba because I frankly think he'll (Kurt) show him up quite a bit. No one wants to say it, but make or break time for Bubba coming up.
 
Dr_B_UNC said:
Kurt is going to put a lot of heat on Bubba because I frankly think he'll (Kurt) show him up quite a bit. No one wants to say it, but make or break time for Bubba coming up.
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Yes, Kurt will be good. Bubba is fine.
 
Kiante said:
Make or break time for what?

Pockcrass on what's to come on Friday:
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Meaning if Kurt does really well and wins (which I think he will), it will turn up the heat on Bubba as the excuses will be gone. As long as he sells sponsorship and runs top 20, Bubba is safe to keep the ride. Don't get me wrong. I'm more thinking of "legacy" and reputation. Bubba needs a win without an asterisk for the haters, and with Kurt's help I think the team will get there this year. Bubba just has to deliver. *hot take*
 
Dr_B_UNC said:
Meaning if Kurt does really well and wins (which I think he will), it will turn up the heat on Bubba as the excuses will be gone. As long as he sells sponsorship and runs top 20, Bubba is safe to keep the ride. Don't get me wrong. I'm more thinking of "legacy" and reputation. Bubba needs a win without an asterisk for the haters, and with Kurt's help I think the team will get there this year. Bubba just has to deliver. *hot take*
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He'll be fine.

Clean slate for everyone, so its all about adaptability to the handling characteristics of the new car. We shall see, I'm not concerned about an "astrisk" win. It's there in the history books and we all saw how he got to first.

All that really matters at the end. Let people be negative that want to be.:)
 
Kiante said:
He'll be fine.

Clean slate for everyone, so its all about adaptability to the handling characteristics of the new car. We shall see, I'm not concerned about an "astrisk" win. It's there in the history books and we all saw how he got to first.

All that really matters at the end. Let people be negative that want to be.:)
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Right on. Cheers and here's to a great first Christmas for you in this neck of the woods! :cheers:
 
Mispeedway15 said:
I’ll be honest, they might of found something here at 670
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Maybe 670 is the new 550?

The new cars seem to have a lot more drag than the Gen 6 cars. That's why when using to same 550 HP motors as last year, the Next Gen cars are significantly slower and more lethargic, despite trying a wide range of different spoilers and other aerodynamic details. I'm slightly surprised they designed in more drag; and I'm shocked they seem surprised that they have more. They seem to be scrambling to overcome the drag. Didn't they know that from CFD analysis and wind tunnel work?

As you have pointed out, the Next Gen cars are symmetrical and smaller quarter panels, both of which reduce side force. But they seem to be scrambling to add side force back via fins and skirts... WTF? I'm opposed to side force because it creates bad mojo when cars get side-by-side during a passing maneuver. Time will tell...

Are they still running holes in the windshields and holes in the rear window? That seems like an inelegant, jury-rigged solution to interior ventilation. Can't say I like that, just my opinion.
 
LewTheShoe said:
Maybe 670 is the new 550?

The new cars seem to have a lot more drag than the Gen 6 cars. That's why when using to same 550 HP motors as last year, the Next Gen cars are significantly slower and more lethargic, despite trying a wide range of different spoilers and other aerodynamic details. I'm slightly surprised they designed in more drag; and I'm shocked they seem surprised that they have more. They seem to be scrambling to overcome the drag. Didn't they know that from CFD analysis and wind tunnel work?

As you have pointed out, the Next Gen cars are symmetrical and smaller quarter panels, both of which reduce side force. But they seem to be scrambling to add side force back via fins and skirts... WTF? I'm opposed to side force because it creates bad mojo when cars get side-by-side during a passing maneuver. Time will tell...

Are they still running holes in the windshields and holes in the rear window? That seems like an inelegant, jury-rigged solution to interior ventilation. Can't say I like that, just my opinion.
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I guess if money were no object things would be different...but it isn't that way. They raised the cars off of the track and added a complete underpan. That's cheaper BUT it adds drag. What they are having problems with are stability in traffic. That is something that is almost impossible to simulate except at the track in real conditions. Wind tunnel and CFD analysis are almost worth less for that.
 
StandOnIt said:
I guess if money were no object things would be different...but it isn't that way. They raised the cars off of the track and added a complete underpan. That's cheaper BUT it adds drag. What they are having problems with are stability in traffic. That is something that is almost impossible to simulate except at the track in real conditions. Wind tunnel and CFD analysis are almost worth less for that.
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I'm curious about how the simulators work. Put in a LOT of numbers and push the compute button I guess. Just think about how many mechanical variable's there are just to get a baseline. Spring rates, leverage ratios of suspension, swaybar influence, center-of-gravity vs ride-height. Etc, Etc.

How do they start with a clean sheet of paper vehicle like this?

It's mind boggling. Guess that's why engineerds get the big money.
 
StandOnIt said:
I really wonder if there is something else going on when they worry about spoiler height.
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NASCAR is probably worried that fans will complain about the cars being too spread apart. Even though cars will eventually get strung out, even with the High DF/Low HP package.
 
Spoilers are what they are, they have been changed around so much I lost track and caring. I believe the worse racing stats wise was when they had a small one, really too hard to handle on the 1.5's I believe. They have to keep the rear on the ground from flying when it is going close to 200 so I think they err on the side of caution when they spec one. The teams are going to do their best to hide it from the wind so Nascar might have some wiggle room built in for that happening. Pure guesswork on my part, but the teams were able to do that on the last gen.
 
Kiante said:
Friday test Live stream:


Inventory day, so this will be great background noise.:)
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Took some trash out. Walk is damp. I'm 10ish miles NE of Raleigh. See they are jet drying the track. Is it still misting over there? Wonder if they will bump it to tomorrow if still raining?
 
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