WIP Beta released DeLorean DMC-12 ('81 - '83)

Discussion in 'Land' started by LucasBE, Dec 5, 2020.

  1. urbanestdog45

    urbanestdog45
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    yeah, so after they went to 2015 it got replaced with what was a coffee grinder (but re-used as a prop)
     
  2. Nicholas PTgamer

    Nicholas PTgamer
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    OMG WHEN DID THIS RELEASE WOOO!!!
     
  3. Racc'd

    Racc'd
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    I've waited at least several years for an actually good DeLorean mod to come out and here it is!
     
  4. moses72

    moses72
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    this is probably the best mod ever created, still waiting for the BTTF variants doe
     
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  5. Jakux

    Jakux
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    I think this is getting out of control...
    I`m trying to get back to the topic, and I advise You to do it too.


    Okay, Delorean was made from 1981 to 1983, and the first Back To The Future movie was made in 1985. So, do You guys think: If the movie was made earlier or DeLorean`s production could last longer, would DMC last to this day? It's about Delorean so it counts I think
     
    #565 Jakux, Feb 6, 2021
    Last edited: Feb 6, 2021
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  6. Slugfest

    Slugfest
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    It's mostly on topic, so we'll go with it. And yes, I think they might have been a Tesla type thing before Tesla (in that something completely not feasible from a normal perspective was made successful by its popularity in the moment).
     
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  7. SKB

    SKB
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    my guess is that as an actual car the delorean wasnt the best.. I think it has the fame just due to the bttf movies... im not sure though.

    Buuuut, seems like they're gonna electrify it or something.. bleh.. i like electric cars for the instant torque and (oh yea, green energy and stuff)..

    i wish electric cars had a manual transmission type mode where the car stops accelerating for a second and got back on the power.. something like a CVT with the different stepped stuff..

    speaking of, will there be any electrified versions?
     
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  8. Ichinose_Shiki

    Ichinose_Shiki
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    A CVT on an electric car doesn't make sense tbh
     
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  9. DaddelZeit

    DaddelZeit
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    Why not? It allows for fast acceleration and high topspeed. That's genius imo.
     
    #569 DaddelZeit, Feb 6, 2021
    Last edited: Feb 6, 2021
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  10. Dayz Me Rollin'

    Dayz Me Rollin'
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    unnecessary mechanical complexity for zero real world advantage, if it worked well they'd use CVTs in real world EVs
     
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  11. SuperShep1

    SuperShep1
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  12. javier caceres

    javier caceres
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    that's why
     
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  13. SuperShep1

    SuperShep1
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    lol i just sent that
     
  14. cheese jungle

    cheese jungle
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    are you not the guy from the tread with this alt that you made?
    sfaf.png
     
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  15. TechMechanic

    TechMechanic
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    Technically Delorean does still exist, just producing a limited number of DMS-12's per year, but the question is interesting. The DMC-12 introduced some incredible ideas such as the stainless steel body to stop rust (A similar idea to the tesla cybertruck's exterior). In all likelihood though the company would still fail, even though some genius designers and engineers were in on the project, the car wasn't up to a decent standard. Hell, the main reason it was used in back to the future was due to how comparatively bad the car was. Even if the film came earlier it wouldn't change the fact the car was flawed.
     
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  16. javier caceres

    javier caceres
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    LMAO
     
  17. REDONE

    REDONE
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    From what I've heard, IIRC, that they are only doing like a custom order type of thing. I could be wrong, but that's something I remember reading.
     
  18. stale

    stale
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    bump, interrupted a convo with this on accident
     
  19. default0.0player

    default0.0player
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    CVT doesn't work well with electric motor because it lowers the transmission efficiency. Belt drive is significantly worse than gear drive in terms of efficiency, that's why even in an ICE vehicle, CVT is less fuel-efficient than manual transmission.

    The problem of electric vehicle is despite it's high efficiency than ICE, it has lower topspeed, poor "power utilization"(explained below) and less "fuel" economy at highway speeds.

    Most if not all EVs only have one powerband

    As shown in this Tesla Model S, the power band is 45~75 mph. ICEVs can shift gear, making them multple power bands.

    For example the Hirochi SBR4, the TTS2 power bands are 53~62, 90~107, 125~148, 157~189, 191~229, 236~283, 310~369km/h. The eSBR 800 power band is 109~156km/h.
    That's why despite the eSBR 800(807PS) has much more horsepower than the TTS2(454PS), the TTS2 is a bit quicker(at least not slower) in races.

    Electric Vehicles also has problems such as low topspeed and poor economy on highway speed, due to the very short final drive (torque multiplication ratio too high)

    The energy losses of an ICE are heat dissipation(combustion heat unused) accessories(coolant pump, A/C, oil pump), pumping loss(throttle valve vacuum), and mechanical friction. To drive eco, cruise fast enough to shift to the highest gear. Low rpm means low friction losses, highest gear means low torque multiplication ratio, the engine load is higher, the pumping loss is lower. That's why ICEV is more efficient on highways.

    EVs on the other hand, is less efficient on highways, because the torque multiplication ratio too high, often 6~9 in comparison to ICEV final drive 3~4, and no shift gear(alway on 1st gear). Thus, cruising on highways the RPM is also high.
    The energy losses of an Electic Motor are mechanical(friction, cooling fans), core(hysteresis, eddy current) and resistance(winding) loss. Mechanical losses are linear(friction) or squared(cooling fan) at RPM, core losses are squared at RPM change, resistance loss is I^2*R, is squared according to electric current.
    EVs use or induction motors or permanent magnet motors.
    Induction motors at max acceleration(full throttle) the motor driver increase voltage/frequency(V/F) to speed up, maintaining rated current(thus rated torque) until the max power rating is reached, then in adjust the V/F to control the power rating. At max voltage, the motor driver controls the F but not V, leading to a loss of torque. At partially throttle, the motor driver just reduce the torque/power output according to the gas pedal.
    Permanent magnet motors are similar to shunt excited motors(shunt winding replaced by PMs), the higher the RPM, the higher the back-EMF, the motor driver adjust the motor voltage to higher than back-EMF and use the voltage to control the current, according to the gas pedal.
    The problem is, when reaching max voltage, there's also a max RPM because of the back-EMF. To reach even higher RPM, the motor driver have to use field weakening

    This is accomplished by inputing another current to reduce the PM magnetic field, this is effectively manipulating the shunt current as in a shunt DC motor, this lowers the efficiency by making the motor "softer".

    Now let's compare the difference between these motors.
    Induction motor: higher resistance loss at high load, because both the stator and the rotor have current, more efficient at lower loads(no core loss when the current is off). At higher speeds(above base speed) the motor is less efficient because it's "softer", higher "slip"(input F minus rotor RPM) lower efficiency.
    Permanent magnet motor: better efficiency at rated power, since there's only one resistance loss, but low efficiency at lower loads(core loss is present even with zero current). Remember the "cogging" torque when you turn the motor by hand in an R/C car/plane/boat? That's core loss. At higher speeds(above base speed) the motor is less efficient because it's "softer", the efficiency is even lower than induction motor because additional current is introduced to weaken the field.

    In order to hypermile an EV, the driver need to stay below the base speed(note that Tesla best mileage is achieved at 39km/h, half of the base speed), and use moderate load(the best efficiency is where the core loss is the same as resistance loss).
    In practice, vehicle manufactures and most of the customers favor 0-60(0-100). They use the 0-60 lunch (and possible illegal street drag racing) to claim they are "superior" than ICE drivers. Only to be disappointed when they realize cruising at highway is only two thirds of rated range.
    In terms of sports EV, they use high powered motors to achieve higher speeds, the acceleration is capped by tire grip, thus the base speed is higher. However, since the motor rated power is high, the motor load is low on cruising(300kW rated but cruise at 30kW), the core loss is higher%.
    In terms of econobox EV, they use less powerful motors to reduce cost and weight, the acceleration is capped by torque, but they still want to "defeat" ICE econobox in 0~60(0-100), So they use high torque multiplication ratio to inprove acceleration, making the topspeed 87~112mph(140~180km/h). Cruising at 75mph is definitely higher than the motor "base speed", reducing range a lot.

    In order to improve cruising efficiency and topspeed, either use multiple gears(such as 2-speed sequential) both good 0-60 and better topspeed, the cruising efficiency is not that high because the transmission efficiency is slightly lower, or use a lower torque multiplication ratio final drive to increase "base speed", better highway range but poorer 0-60.
     
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  20. maslimepunch

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    in other words cvt bad lol
     
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