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geemy
Engineering Explained
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Comments by "geemy" (@geemy9675) on "No, Tesla Can't Hit 60 MPH In Under 2 Seconds (Model S Plaid)" video.
@Thevikingcam dragsters are using different compound for the tires that doesn't have to last longer than 1/8 miles compered to tens of thousands of miles for road cars. tires are brought to avery high temperature with burnouts and the exhausts push so much gases upwards that they provide a very high down force even from a stop. plus sticky rubber on the strip increases the friction coefficient even more none of that happens when measuring 0-60 or 60-0 on a road car
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@Birroou yes it does. rubber doesn't know if it is going forward, backward, accelerating or breaking. except I'm not sure even recent ABS are capable of doing that because it' going to the point where it's locking the tires, and then release hydraulic pressure until traction is regained, then repeats that as quickly as it can. maybe with more accurate sensors that could detect something like 5% of slippage,it could try to maintain this amount of slippage with very fine control. but probably just not on 4 tires at the same time otherwise it would have a hard time determining if all wheels are slipping bat the same time or if none is slipping
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@Wydarr the whiteboard explains braking distance between 60-0mph. at higher speeds and with lots of downforce, I'm sure a high down force car with huge carbon ceramic brakes like the GT3 can pull more braking G's. but you are right that a braking distance which is entirely limited by the tire's traction is heavily dependent on the parameters you mentioned like tired pressure/temperature. like any drag racer knows this can have a big impact on 0-60 and for sure will have a similar one on braking distances My guess is that a 60-0 braking distance being more safety than performance it would make sense that it's tested with reasonably hot tires and brakes,but nowhere near the temperature a hot lap on the nurbugring on a track car like the GT3 coule reach. I really don't know how standardized are these tests anyway so I might be completely wrong and it's up to the manufacturers to decide their test protocol
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@ralfrudi3963 would it be technically possible to make a 6x6 version of an existing powerful AWD super/hyper car that is still traction limited instead of just putting the largest/stickiest road legal tires available? I'm pretty sure, although it would have zero economical sense and brand image impact. doing it as hot rodding project for a youtuber, again it would make no sense in terms of performance but who knows as long as it makes views. maybe with the next gen of 2000+ hp AWD hypercars, bug again who would want to butcher a muti million dollars hypercar and make it ugly and probably perform worse overall, except a rich youtuber ? simply putting drag/race tires would work just as well so there is no real value in doing a custom built car and then run it on stock road legal tires. Now if a supercar manufacturer goes and designs a 6 wheels awd prototype or low production car from the ground up with optimized downforce/drag/cornering performance, like a grand child of 6wheels F1 from the 70's, AND manage to make it look good, and perform better than other supercars, that would be awesome but that would be a shock for almost everyone. bit hey tesla announced a supercar with thrusters, so who knows...
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@EngineeringExplained uphill because gravity will just slow you down, or in any concave part of the road with a positive vertical acceleration component because of the added down force. on the other hand, on top of a hill you 'd better dial back your braking power ! I think there are a few videos at the Ring that show that
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@ganymede3141 then they should test the braking distance under the same exact circonstances otherwise it's apples and oranges provided they find a drag strip that will let them test the brakes in the same way...
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