https://www.carthrottle.com/post/how-do-electric-vehicles-pr...
(This incidentally is part of why Tesla started with the Roadster - the flat torque curve of an electric motor can give some great acceleration numbers, which is pretty nifty when you're building a status-symbol sports car.)
If you look at the torque curve of a modern pickup truck engine, it's either completely flat or it's actually decreasing as you go from low to high RPMs. E.g. the GM Duramax 6.6 maxes out at 1200 Nm at 1600 RPM, then decreases to 900 as you go higher in revs. For comparison, the Model X P100D puts out 660 Nm at peak.
Wrt. Tesla's acceleration numbers - it's always been possible to obtain those. In fact, sub 2-second 0-60 times were achieved with road legal Ford RS200 in the mid 1980s. Sports car manufacturers have instead been competing on track times on famous circuits like the Nurburgring Nordschliefe. Tesla hadn't a snowballs chance in a hatching machine to compete on that, so they went and optimized for a spec where there was no real competition, and that fit their technology well.
As for traction control, there is no system in the world that is superior to just locking all three diffs. This is what you find in serious off-road machines, and many decent pickups. No sensors, no intelligence, no response times, just simple mechanical engineering that will always automatically distribute torque to where it is needed. Instead of being reactive, acting when slip has been detected, it is proactive and gives you torque where there is grip.
Assume you're stuck in mud somehow, a perfect case for diff lockers. If you lock the rotational rate of all your wheels together you are either:
a.) limiting the torque you're applying to the amount the tire with the least amount of traction available can bear before slipping out, or
b.) letting 'em rip and hoping you don't dig yourself down into a hole.
The beauty of having fine control over the power going to each motor is that you can put down the max torque that particular wheel can manage regardless of what the other tires are doing. And you can do so with a granularity that is unmatched by any ICE TC system (which IIRC use the brakes to control torque?)
Where Tesla just put down a 7:13
> torque curve
What's the Duramax's torque at 0 RPM?
For comparison, a front-wheel-drive stock Renault Megane RS does 7:40. Mercedes did 7:25 in a stock 4-door coupe last year, the AMG GT 63S. The stock supercars are down below the 7:00 mark mostly.
In the non-stock category, the record is 5:19 by one of Porsche's modified LMP1 cars.
If you look up how a stall speed converter works, you'll see that an automatic transmission delivers torque at a non-zero engine RPM even if the wheels are at zero RPM. The lowest you will go on the Duramax is around 1000 RPM, where you get 600 Nm torque.
When my beloved '00 Ram 1500 died about 5 years ago I decided to hold out for an electric truck that I assumed would be coming to market. Looks like I may finally get my chance shortly. I honestly don't know if the cumulative environmental footprint is better, but I do know an electric motor will be superior.
That's just a law of converting massive amounts of kinetic energy into potential energy as the weight goes up hill.
If it's only city travel it's fine but that's not what a truck was made for.
I'm all for electric vehicles and I hope the technology advances but people need to be realistic.
It's like the customer service industry if all the comments are compliments how do you know what is wrong?
The truck market is downright scientific, and Ford is the leader in that market. They serve a lot of fleet customers and have huge amounts of data about how those fleets are used. They must have found a segment that will find electric vehicles cost-effective, otherwise they'd put it off another year or two or three. It's not the average truck buyer that's pushing them toward electric (there's a deep vein of stupid in that market that loves big, noisy, smelly, engines), but I'm confident they aren't doing it out of the goodness of their hearts. I believe Ford making an electric truck means there's a market for electric trucks, whatever their limitations, at the price they can deliver them.
Teslas don't lose half their range when it's cold. They do lose some range, but it's much less than other evs, because they heat up the pack. evs are great for cross country travel, if there are reasonable charging stations along the way (which is best with tesla).
what good is that when your theoretical car can only hold 2.5 (maybe) gallons of fuel
Huh? Less efficient than what? There is no way it is less efficient than an ICE.
Realistically most people driving full sized pickup trucks aren't farmers and aren't rural.
I don't think the Ford dealership would warrant me driving an F-150 through several feet of water either but fixing the issues that come from it are a known quantity. Not so much with an electric pickup.
The problem you're mentioning being solved by a battery pack could just as easily be solved by putting any random ballast in the back of the regular truck. I think electric will have other advantages (and disadvantages), but I doubt this is a big one for most people.
Take a look at the market. Lots of the trucks actually sold are dumpy underpowered RWD sixes or less, and the new motors are getting smaller, better, and more fuel efficient. Doesn't sound like the market wants a heavier boat to careen down the interstate in.
You can charge a whole lot more for the industrially useful V8's (which are still dumpy IMO, their job is "Don't stop turning over.") and much better diesels anyhow. At least telling uncle charlie about the OEM underslung sandbags will get quite a chuckle at Thanksgiving dinner.
Unlike Internal Combustion vehicles, electric vehicles typically feature regenerative braking. Therefore any added weight is much less of an efficiency handicap (compared with IC).
The battery adds weight, but that's more than outweighed by the tremendous efficiency of an electric drivetrain. The EV equivalent of a gas-guzzler (e.g. a Tesla Model X P90D) still achieves the equivalent of 90mpg.
While regenerative braking is most common in electric vehicles, this also is not unique to electric vehicles. A hybrid vehicle can just as easily benefit from this, such as the Prius.
> Additional weight by itself does not waste energy. It does require more power to accelerate. The extra power is turned into higher kinetic energy for the same cruising speed. However kinetic energy is not waste. It can be recovered during deacceleration.
This is incorrect unless the engine/motor, drivetrain, and tires are all 100% efficient - additional weight always wastes energy.
But I agree with you, electric vehicles are more energy efficient than gasoline vehicles.
If you momentarily ignore the fact that its ultimate energy source is gasoline and focus only on the regen system a hybrid is an electric vehicle, just one that (sadly) lacks a plug.
Not just the lack of regen. ICEs waste energy while idling, as heat, noise, and vibration, and mechanical couplings like clutches and especially fluid couplings in automatic transmissions also waste energy. Automatic transmissions in particular are only 90% mechanically efficient, on top of all the losses from the ICE.
Changing that weight distribution is very expensive from a R&D perspective. Sometimes the battery is moved, or the engine is moved a few inches relative to the front axle. This is one of the reasons performance oriented cars are often rather large compared to their usable interior volumes.
Battery operated cars do have a weight penalty, but you can put that weight wherever you want. You could relatively trivially make a 50/50 distributor of significantly front or rear biased with no substantial R&D overhead or loss of efficiency.
For instance the Tesla model 3 not only has a very low center of gravity, but also a very low polar momentum. In an ice car that would require a mid engine design (like a Ferrari, Lamborghini, or the newest Corvette. While having an large usable volume, more like a bmw 5 series than a 3).
So basically weight distribution is easy to tweak with batteries, and even with the weight penalty have a substantial lead in efficiency.
> So basically weight distribution is easy to tweak with batteries
No. You can do this when designing the car, but not afterwards. You want more weight in the regular pickup truck? Throw it in the back. You want less? Take it out. You can't take the batteries out of the electric vehicle. All my original comment said was you can add weight to the back of a pickup truck to improve traction on the rear axle. I didn't talk about center of gravity, or performance vehicles, or even mention that electric vehicles are heavier.
I am astounded by the amount of comments taking something I said, responding to it maybe tangentially and then concluding with "well that's why electric vehicles are better!" Let's just agree to disagree.
> I was not making a general comparison between the pros and cons of electric vehicles
And you replied:
> Yes, but on the converse side...[something that has nothing to do with traction]
Am I unintentionally arguing that electric vehicles are bad? I get the impression people think I hate electric vehicles and are trying to convince me of their virtues, when I was simply pointing out what I thought was a logical flaw from another commenter.
Most would consider the Tesla Model 3 a luxury car. The BMW 3 series and Telsa model 3 are positioned similarly. Both are $40k-$80k, optionally AWD, sold as performance luxury sedans in a range of different performances. If you want to pick two particular models I'd say the model 3 AWD and the BMW 330i xdrive are very similar.
The BMW weights 3,763 pounds, so the Model 3P weight 4,072, which is just over 8% heavier.
Seems like 8% is about right to me.
For the Model X I was really surprised how small the differences were. Compared to a G Wagon, which I'd say is really its competition, the difference in weight is about 8%. Compared to an X5, it's about 5%. If you consider the X7 to be the competition (which most people probably do), the X7 ends up being about 1% heavier.
And just to add it since I'm already doing this, I think the clear competitor for the Model 3 Performance is the M2 Competition. They're specifically meant to be track vehicles that you can comfortably use for your daily driver. This puts the weight disparity at 18% for that model. And just for fun: https://youtu.be/HycUgd6fTWI & https://www.youtube.com/watch?v=9Pu9046wX9g
So I guess the conclusion is electric vehicles are heavier, but as you move towards already heavy vehicles like SUVs the weight differences start to vanish. But as you move towards more smaller vehicles, the difference is much more noticeable.
A 5 series is much closer, 5 adults, 18 ft^3 cargo space, and even leads by a bit on passenger space (98 ft^3 vs 94 ft^3). The model S is AWD only, so to be fair lets add that to the BMW 5 series.
The BMW 550i xdrive "base curb weight" is 4,372, the Tesla S P100D is 4883, so 11.6%. Both cars have slower/lighter versions of course. The M550i has a 0-60 of 3.8 seconds, the Tesla 2.5 seconds.
They are both handle 5 passenger, have 4 doors (ignoring the heavier hatchback on the S), have AWD, are within 1 inch wheelbase and 0.6 inch in length. Having sat in both I'd say that feel relatively similarly sized, especially in the back seat (unlike the M4).
As for the m2 competition, I think the weight distribution can be partially attributed to it being a small 2 door with a token rear seat and tiny trunk than any strong statement about ICE vs electric. I'm not saying batteries (at least today) are not heavier, just that for comparably sized/marketed cars the difference is relatively low.
I think a common trap is to compare a large tesla that fits a family of 4+dog and to compare it to a high performance sports coup... because of the similar performance. Not because they are comparable cars for most uses.
I'd take computer managed digital torque delivery over feathering my old clutch plate, if you even still get to run one of those. The dual-clutch trans will need your other foot. Mushy delivery (Sounds like an f150 to me) and out of the mud aren't really compatible.
At least you can remove that weight when you need to. I bet it's a lot easier to tow a 4,000 pound truck out of a ditch than a 6,000 pound truck.
Anyhow, instead of faffing around with silly sandbags, a mid-engine truck is what you're dancing around. Closest thing I've heard of is the Isuzu ELF (NPR in my neck of the woods) which they've been producing since the 60's or so. The motor is kind of underneath the cab. Nobody wants what you're selling.
[1] https://youtu.be/bXFHgoon7lg