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Thread: The Technical Questions Thread

  1. #1456
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    Water tire cooling for the next world's fastest supercars?

    Water tire cooling for the next world's fastest supercars?

    The Bugatti Veyron tires would fail after 15 minutes driving at 400 km/h+
    Although the fuel tank will be empty sooner than that, the tires seem to be the weak link.

    Will spraying fine water droplets cool tires enough to go beyond 500 km/h?
    Increasing the Tire Life Span by Means of Water Cooling
    http://eprints2.utem.edu.my/8585/1/I...-_waterjet.pdf

    Would sprayed water cause some aquaplanning or dangerously reduce friction at such high speeds?
    Land speed tires are made of very hard rubber compounds that already have low friction so maybe friction won't be an issue at all.

  2. #1457
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    At those speeds I would imagine the entire tire carcass would be above boiling, so assuming it was a fine-enough mist, it should vaporize instantaneously and not cause the contact patch to get wet. The problem with their setup is that it only cools the outside of the tire; the failure isn't necessarily along the circumference.

    I remember an interview with Nick Heidfeld's F1 engineers back when he was a BMW driver. He had been having trouble bringing his tires up to temperature and the interviewer suggested doing burnouts. The engineer said that that would only warm up the outside of the tire and what was really needed was to warm the entire carcass through near-constant loading.

    At that point we would have to start considering adding water or metal heatsinks to the inside of the tire and/or to the wire matrix (or whatever it's called) inside the rubber of the tire.
    "Kimi, can you improve on your [race] finish?"
    "No. My Finnish is fine; I am from Finland. Do you have any water?"

  3. #1458
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    Just a question for the older UK members- how is this vehicle a "recovery" vehicle?

    A recovery vehicle to me is a tow truck. Is this a "spare parts and mechanics that might help me" vehicle?

    3913 WE Recovery Vehicle | Flickr - Photo Sharing!

    Thanks.

  4. #1459
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    I believe it may be a recovery vehicle for buses.
    Lack of charisma can be fatal.
    Visca Catalunya!

  5. #1460
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    Ah, thanks.

  6. #1461
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    Question about the Acura ILX- it's supposed to have an 8 speed dual clutch transmission... but it also has a torque converter. How does that work and why does it have a torque converter?

    I thought the DCT was supposed to eliminate the torque converter. What would be the advantage of keeping one?

  7. #1462
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    Quote Originally Posted by NSXType-R View Post
    Question about the Acura ILX- it's supposed to have an 8 speed dual clutch transmission... but it also has a torque converter. How does that work and why does it have a torque converter?
    A DCT is very similar to an ordinary manual transmission, it just has the two shafts for odd and even gears. Sticking a torque converter wouldn't be tricky; think of it as just another clutch.

    I thought the DCT was supposed to eliminate the torque converter. What would be the advantage of keeping one?
    For the blorby smoothness of a slushbox. DCTs still aren't all the way there when it comes to smoothness; their NVH levels and jerkiness are jarring to little old people who drive Lexuses and Acuras. With a modern locking-torque converter, fuel consumption shouldn't increase, just weight and complexity.
    Last edited by f6fhellcat13; 12-03-2014 at 12:25 PM.
    "Kimi, can you improve on your [race] finish?"
    "No. My Finnish is fine; I am from Finland. Do you have any water?"

  8. #1463
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    Quote Originally Posted by f6fhellcat13 View Post
    For the blorby smoothness of a slushbox. DCTs still aren't all the way there when it comes to smoothness
    Or anyone who doesn't want to be jerked around at low rates of speed.

    At least if you row your own gears and it is jerky it's your own fault, and it is usually fun.

    That jerkiness is a problem that needs to be solved.

  9. #1464
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    I am a lunatic Mediterranean who drives an Alfa Romeo and I too find the low speed jerkiness of dual clutch gearboxes unacceptable.

    Maybe posh Toyota/Honda drivers and posh Fiat drivers have something in common?
    Lack of charisma can be fatal.
    Visca Catalunya!

  10. #1465
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    Thanks for the explanation.

    At this point, there are exactly 0 cars in the Acura lineup with a manual transmission.

  11. #1466
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    Quote Originally Posted by NSXType-R View Post
    Thanks for the explanation.

    At this point, there are exactly 0 cars in the Acura lineup with a manual transmission.
    Well, then Acura has something in common with Ferrari.
    Lack of charisma can be fatal.
    Visca Catalunya!

  12. #1467
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    Quote Originally Posted by Ferrer View Post
    Well, then Acura has something in common with Ferrari.
    And Lamborghini. And Lexus. And all US Mercedes offerings.
    Turning money into memories.

  13. #1468
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    Quote Originally Posted by NSXType-R View Post
    Just a question for the older UK members- how is this vehicle a "recovery" vehicle?

    A recovery vehicle to me is a tow truck. Is this a "spare parts and mechanics that might help me" vehicle?

    3913 WE Recovery Vehicle | Flickr - Photo Sharing!

    Thanks.
    yep, in UK very common for each bus company to have had their own fleet of recovery vehicles.
    As many old busses were designed on truck platforms then they formed a good basis for a towing vehicle to recover a broken down bus. So no need for other vehicles or retraining mechanics



    Most recovery now is left to recovery specialists with what you'd recognise as a general heavy vehicle recovery vehicle.
    Bus companies still often run vans though to attempt repair at roadside and these are often sill marked recovery over here. I always just want to look out for a Transit van trying to "recover" a double decker bus
    Last edited by Matra et Alpine; 12-05-2014 at 10:27 AM.
    "A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'

  14. #1469
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    Quote Originally Posted by Ferrer View Post
    Well, then Acura has something in common with Ferrari.
    Quote Originally Posted by Rasmus View Post
    And Lamborghini. And Lexus. And all US Mercedes offerings.
    That's not something to be proud of honestly. We went from the Integra and the Legend to just selling the MDX, the ILX and the RDX.

    How sad.

  15. #1470
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    Quote Originally Posted by Matra et Alpine View Post
    yep, in UK very common for each bus company to have had their own fleet of recovery vehicles.
    As many old busses were designed on truck platforms then they formed a good basis for a towing vehicle to recover a broken down bus. So no need for other vehicles or retraining mechanics



    Most recovery now is left to recovery specialists with what you'd recognise as a general heavy vehicle recovery vehicle.
    Bus companies still often run vans though to attempt repair at roadside and these are often sill marked recovery over here. I always just want to look out for a Transit van trying to "recover" a double decker bus
    Ah, this is the sort of answer I wanted! Thanks!

    I don't know about you guys, but I LOVE recovery/tow trucks, especially the ones with the huge cranes in the back with at least 5 axles.

    I also have a love for fire trucks too, especially the chunky airport fire trucks.

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