Cupra E-Racer

Discussion in 'Car Information and physics updates' started by Alex Hodgkinson, Oct 10, 2020.

  1. Alex Hodgkinson

    Alex Hodgkinson Sector3 Developer

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    [​IMG]

    Following on from the Volkswagen IDR, I'm happy we can finally show off our second all-electric car. There's a lot to discuss here, so let's get cracking. First some vital statistics;

    Weight: 1680kg with the driver
    Power: 670hp peak
    Peak torque: 975nm at 0rpm
    Drivetrain: All-electric RWD with regenerative braking
    Weight distribution 40F/60R

    To begin with, don't be fooled by the similar appearance this car has to the regular TCR Cupra. Under the skin, this really is quite a different beast. Starting from the front end, we now have an empty engine bay where the internal combustion engine has been omitted. There's nothing there to replace it, just a few radiators and some wiring, as you might expect. Moving to the rear and this is where things really take a departure from the TCR car. Back here it is pure prototype with double wishbone suspension, huge brakes, and most importantly four electric motors arranged in parallel (stacked like a packet of biscuits) around the differential:

    2018-CUPRA-e-Racer-Design-14.jpg

    2018-CUPRA-e-Racer-Design-13.jpg

    The batteries sit down in the floor pan of the car (picture above) keeping the centre of gravity nice and low. Below the batteries sits a huge flat floor with rather large venturi tunnels. Thanks to those, this car is capable of around three times as much downforce as the 2020 Cupra TCR, or around the same amount as a current-generation GT3. It's a very different tool to a TCR.

    To cope with increased demands on the tyres, the car sits on bespoke wider, fatter rubber than it's front wheel drive cousin. They're also at the rear than the front, with 280mm and 315mm tread widths respectively. Compounds are pretty similar to what we already have with GT3, GT4 and TCR. They come preheated and give optimal grip at 80 to 90 degrees C.

    Now, on to the drivetrain and you may of already found that there are two driving modes; D & S:

    D-mode is a simple drive-only mode. You put your foot down, it uses the battery power up, that's all. It doesn't recharge so once it's gone it's gone. It also disconnects the motors when you lift of the accelerator pedal, so deceleration is only by wind resistance, rolling resistance and the brakes.

    S-mode is where things get clever. It enables regenerative braking, which basically reverses the poles of the motors as you lift of the throttle or brake. That enables 'engine braking' when you lift off the power, and also charges the batteries when you press the brake pedal. The regeneration is up to 15% efficient, which means that up to 15% of the power available at the current revs is instead sent as charge to be stored in the batteries.

    There's more to it though - if you scan through the keymapping options you'll see that we have added the option to set different regen modes. Now this is really important when you consider that the regen happens only at the rear axle, so how much regen is active can really change the balance of the car. It may also be the difference between winning and loosing a race as now power-management becomes an important part of race strategy. At a later date we will also be adding engine map modes, whereby the amount of power and thus energy consumption will become adjustable in-car.

    For some more tips on actually driving the cars, see the video below:

     
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  2. Zziggy

    Zziggy Well-Known Member

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    Will raceroom also cover the entire 2021 PURE ETCR championship (where besides the e-racer a Hyundai Veloster N ETCR; Alfa Romeo Giulia ETCR and MG MG 6 are confirmed)? The cars will use a common drive train with design and chassis coming from the competitors:
    https://en.wikipedia.org/wiki/Pure_ETCR
     
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    Last edited: Oct 14, 2020
  3. MattYKee

    MattYKee Active Member

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    I'm hoping they do this. Quite a shock to see all those "E-racer" name tags when i booted up an AI race.. lol..

    edit: they also have push to pass.. I didnt notice that ingame.
     
    Last edited: Oct 15, 2020
  4. f1simgames

    f1simgames Well-Known Member

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    We will be ready for that...
    E-TCR Poster Coming Soon Socials.jpg
     
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  5. Zziggy

    Zziggy Well-Known Member

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    I think there is still work to do:
    1) all AI drivers are named "CUPRA Driver" - why not name them properly, for instance with participants of the e-Racer competition?
    2) very poor AI battery handling - maybe this will be improved with the update? In a recent 30 minute Race at Raceland Aragon, I managed with 1 recharge, while the AI recharched 3 (!) times. (AI level 104 which is my usual).
    3) Also they were slow at qualifying (2 seconds back).
     
  6. majuh

    majuh Well-Known Member

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    Did you do a lot of energy saving? The battery only lasts for around 11 minutes if you go flat out.
     
  7. Zziggy

    Zziggy Well-Known Member

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    Yes of course. I wanted to do a 1-stop-strategy so it was approximately 2x 16 min per charge.