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  1. #491
    Senior Member Fast Eddie WRC's Avatar
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    Re the regen by braking...

    When a driver brakes sufficiently hard does the regen system then activate to slow the car, partially slow the car, or do the brakes & pads still do all the stopping ?

  2. #492
    Senior Member Mirek's Avatar
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    Quote Originally Posted by denkimi View Post
    No more diffuser.
    Sort of... I'd say the awkward rear bumpers are made along an idea like this: "Let's make the best diffuser which doesn't look too much as a diffuser."
    Stupid is as stupid does. Forrest Gump

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  4. #493
    Senior Member Mirek's Avatar
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    Quote Originally Posted by Fast Eddie WRC View Post
    Re the regen by braking...

    When a driver brakes sufficiently hard does the regen system then activate to slow the car, partially slow the car, or do the brakes & pads still do all the stopping ?
    The regen of course slows down the car, it can not work other way according to the laws of physics (you take away the kinetic energy of the car and transform it into electricity). It helps to the brakes because you don't need that much braking power from the brakes alone (and therefore you also don't heat them that much).

    When you drive an EV you don't need brakes at all for common gentle braking.
    Stupid is as stupid does. Forrest Gump

  5. #494
    Senior Member Fast Eddie WRC's Avatar
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    Quote Originally Posted by Mirek View Post
    The regen of course slows down the car, it can not work other way according to the laws of physics (you take away the kinetic energy of the car and transform it into electricity). It helps to the brakes because you don't need that much braking power from the brakes alone (and therefore you also don't heat them that much).

    When you drive an EV you don't need brakes at all for common gentle braking.
    I heard the new Audi e-Tron running at the Dakar can do the whole event on one set of brake pads. I daresay the Rally1 cars will be much lighter on brake wear too.

  6. #495
    Senior Member Mirek's Avatar
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    Quote Originally Posted by 1988senna View Post
    and for the boost time. the 3.9kWh can boost for 2.5 minutes with 100kw .so if there have the long long straight during the stage.will the driver make the boost as long as possible or they will touch the brake to end boost to save the energy
    Quote Originally Posted by WRCStan View Post
    There are limits set for each stage by the FIA for how much energy can be used in one boost before having to regen, the regen is also a minimum FIA set limit to recover. We don't know what they are yet to have a meaningful answer.
    Not only that. It also doesn't make sense from technical point of view. The time to reach the top speed from standstill is probably around 15 seconds. You don't need any extra boost to keep the top speed.
    Last edited by Mirek; 13th January 2022 at 19:11.
    Stupid is as stupid does. Forrest Gump

  7. #496
    Senior Member Mirek's Avatar
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    Quote Originally Posted by Fast Eddie WRC View Post
    I heard the new Audi e-Tron running at the Dakar can do the whole event on one set of brake pads. I daresay the Rally1 cars will be much lighter on brake wear too.
    I'm known as a no fan of EVs here on the forum but this is actually a great thing because one of the major sources of polution caused by the vehicle traffic is the dust from the brake pads.
    Last edited by Mirek; 13th January 2022 at 19:11.
    Stupid is as stupid does. Forrest Gump

  8. Likes: AnttiL (13th January 2022),cali (13th January 2022),pantealex (Yesterday),the sniper (13th January 2022)
  9. #497
    Senior Member Sulland's Avatar
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    Thinking reliability, especially in the beginning of the season.
    If the hybrid pack stops working, can drivers continue at topspeed from the ICE without any damage?
    Any other bits and pieces that are new, that represent reliability risk?

  10. #498
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    Quote Originally Posted by Fast Eddie WRC View Post
    I heard the new Audi e-Tron running at the Dakar can do the whole event on one set of brake pads. I daresay the Rally1 cars will be much lighter on brake wear too.
    The next generation Formula E car has no conventional rear brakes at all (regen only)

  11. Likes: cali (14th January 2022)
  12. #499
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    Quote Originally Posted by Mirek View Post
    But of course the recuperation adds a lot of energy. We don't know what recharging power can be used in WRC cars but a heavy braking produces much higher power than the extra boost, which means that the time spend on braking to recharge the energy is not long.
    Wrcwings says:
    f) the recuperation by braking is limited to 30kW, no matter how hard a driver brakes,


    https://www.wrcwings.tech/2021/09/14...-implications/

  13. Likes: Mirek (14th January 2022),Tanelv (14th January 2022)
  14. #500
    Senior Member AnttiL's Avatar
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    Quote Originally Posted by Sulland View Post
    Thinking reliability, especially in the beginning of the season.
    If the hybrid pack stops working, can drivers continue at topspeed from the ICE without any damage?
    Any other bits and pieces that are new, that represent reliability risk?
    Yes they can disconnect the unit but they will lose the power boost.

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