09-25-2020, 07:38 PM | #99 |
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There are speed limits there. Imagine if there wasn’t!
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09-25-2020, 07:41 PM | #100 |
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Pretty impressive considering the cost versus the performance and considering the weight it has to carry versus the competition that has bettered their time.
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09-25-2020, 08:04 PM | #101 |
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09-25-2020, 10:21 PM | #102 |
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Yes, but it is also a executive, 4-door, 5-seater sedan, so yeah, not a carbon fiber, two seater, million dollar, hypercar. Wait until the Roadster tackles the same track. I don’t know how much lighter or heavier it would be, but it will be a Plaid or better powertrain with a lot of extra fat cut off the car. That’s why it is impressive. Unless I am mistaken, the four door lap record was a Mercedes at 1:36 and this was 1:30, so impressive.
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09-26-2020, 01:43 AM | #103 |
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09-26-2020, 06:00 PM | #104 |
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Well we already have the Lotus Evija to compare to...
The battery pack sounds like an LTO (since you would have a hard time getting 1900hp from a 70kWh LiFePO4), which is probably something like 1400lbs. That means the rest of the car is 2300lbs. If they can cut 700lbs, then you have a 3000lb curb weight car with 2000hp AWD, which is pretty freaking nuts. There isn't really any gasoline powered car that can compete with that. |
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09-26-2020, 09:08 PM | #105 |
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Realistically, what ICE car could compare to the maintenance cost or reliability of a Tesla Roadster or comparable EV? The EV won’t win any endurance race with thermal management and recharging being the two issues, but for most owners, such an EV would be perfect unless they specifically want the sound of an ICE or a manual, but most hypercars in this league don’t have a manual.
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09-26-2020, 11:31 PM | #106 |
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Does it get cold anywhere in CA ? Especially north CA ? Serious question. Tesla manuals say to not expose the car to temperatures below -20f for more than 24 hours. That alone would have been a no-go when I lived in VT.
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09-26-2020, 11:56 PM | #107 | |
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Quote:
[IMG]Cold is common at Lake Tahoe, where freezing occurs six out of ten nights a year and no month is free of frost. The coldest nights drop to below 0 °F (-18 °C), which happens on average six nights a winter.[/IMG]
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09-27-2020, 12:52 AM | #108 | |
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09-27-2020, 02:31 AM | #109 | |
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Apparently, swapping out the apex seals to silicon nitride on a Mazda Wankel will make it ultra-reliable. A few more changes and extra money spent will get the efficiency higher, let it spin faster and make more power, and weigh less. A roller bearing crank eliminates oil system reliability issues. This kind of engine will get electric-motor-like power density but with no battery weight and great reliability. Just fill it with oil and gasoline and it'll go until the tank runs dry. Low end torque will be abysmal but you can rely on a mild-hybrid system to help the car get moving. Last edited by serialk11r; 09-27-2020 at 03:02 AM. |
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09-27-2020, 01:42 PM | #110 | ||
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In general, one of the big issues with getting to 2000hp with an ICE engine for a FR layout is that the engine and cooling system needs to become bigger just like the battery/engines on the electric car needs to become bigger, except the ICE is going to add a lot of weight to the front of the car, which will greatly disrupt the weight balance, where the EV will distribute the weight evenly. Take the Buggati Chiron with all the carbon fiber and everything, and it weighs 4300lbs too, so it isn't a light car in its quest for reliable, huge horsepower. It has 10 radiators and: Quote:
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09-27-2020, 02:31 PM | #111 | ||
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that's why mazda has made some ripples pushing the tech as an ev range extender. wankels are also better at constant rpm speeds, which automotive isn't. there's been some rumors in the past for using them in range extending power generators, which is an ideal use-case, but with expanding battery capacities, there's less of a need for it.
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09-27-2020, 05:31 PM | #112 |
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Actually I think it should be possible to formulate a pre-mix oil for Wankels that burns clean enough to do the job. The Renesis used a normal oil fed journal bearing, but it also consumed that same motor oil for lubrication, which guarantees cat poisoning over time.
A oil that's meant to be completely expendable with low emissions should be able to get the job done. If you use a roller bearing crank, then you don't need to circulate the oil anymore, and that takes care of the problem. A charge cooled rotor that runs hotter also reduces the flooding issue because the rotor heats up much faster, and it also improves fuel economy by vaporizing the fuel (at the cost of torque). For a sports car that's designed for the hobbyist to enjoy some loud noises and manual gearbox action in a very lightweight package, you could use something like a souped up version of this: https://freedom-motors.com/freedom_530cc.html 80hp per rotor at only 7500rpm is super conservative. With more spark plugs and lighter rotors, the 3 rotor should be able to do at least 300hp, with a total weight of around 120lbs including the cooling system. That's less weight than electric motors + controllers producing equal power. |
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