Quote:
(...snip...)I don't know what I'm talking about? (...snip...)
See below, decide for yourself. . .
Outersquare, I am baffled by your disproportionate excitement regarding this topic. I had hoped we could steer the discourse back toward center. Since you’ve claimed that I am incorrect about a number of things, it is only fair that I point out the numerous mistakes in your last post. For example:
1. For the record, I studied physics and chemistry, at the college level, and I have received training in a variety of different technical fields. No, I’m not, however, an engineer.
2. Let’s be fair, and stay with apples-to-apples comparisons. Honda’s advertised torque peak for the I-4 accord is 160 foot pounds at 4000 rpm. The advertised torque peak for the V-6 Accord is 211 foot pounds at 5000 rpm, a 51 ft-lb delta. If you would like to switch to all dyno numbers, that’s fine, but let’s have those numbers for an I-4 under controlled, provably equivalent conditions to those used for this V-6. Dyno results can be as unstable and variable as a weathervane in a tornado. You know that. Your unsupported speculation about Honda advertising low horsepower and torque numbers is just that. Frankly, I’ll take Honda’s official representations as accurate, until we see a lot more, proper quality evidence to the contrary.
3. You state, “
But please humor me, if the prius motor makes max torque 0-1200 rpms, what happens after 1200 rpm? The electric motor disengages and stops working? The effect of that would be the electric motor would be utterly worthless for any actual assist or driving.” I’ll take that as an admission that you do not understand how the electric motor-generators are integrated with the remainder of the HSD system. I strongly recommend that you do some study regarding his car’s drive train, as it is obvious that you do not understand how it works. Although an oversimplification, in effect, the large motor-generator is integrated with the outer ring of the planetary gear set which comprises the Prius’ continuously variable transmission (CVT). Through continuous adjustment of the CVT’s “ratios” (it’s “continuously” variable, of course...), this motor-generator’s torque remains available at almost all times.
4. You next state that, “
Toyota must obviously have geared the motor to match the engine crankshaft rotation somewhere in the powertrain.” That's wrong, too, see the preceding paragraph.
5. You’re very next statement, “Presumably the redline is around 6k rpms for the gasoline motor, so the output must be reduced ~6:1 to match the gasoline engine. . .” is wrong as well. In fact, the red line on the Prius is 5000 rpm. This engine uses a radical form of Toyota’s variable valve timing (VVT-I) to achieve Atkinson cycle operation through much of its operating envelope. You do understand the Atkinson cycle, I hope? You would further understand, I assume, why this entire drive train, is biased toward relatively low RPM operation.
6. Your 300 foot pound bicycle analogy, while mathematically sensible, is, with all due respect, absurd in this context. It is in no way a fair or accurate description of how the Toyota Prius actually operates, or what it’s
like in operation, which I suspect is what you were trying to suggest.
7. I have not simply driven the Prius, I own one. I drive it every day. I drive it in big city commuting traffic, and over long distances on interstate highways. I’ve driven it for hundreds of miles along country highways in southern Alabama and Northwest Florida. I drive it 600-800 miles a week. Make no mistake about it, this car is not a Corvette. On the other hand, my previous car was G35 sedan. I’m no stranger to quick cars, and while the Prius is not especially “quick”, it is equally clear,
from experience, that your exaggerated speculation as to its “slowness” is simply inaccurate. Really, why don’t you go to a Toyota dealer and spend 30 minutes test driving one. That might improve your perspective some – and give you some realistic basis to prognosticate about this car’s driving dynamics. Since you haven’t driven one, do
you have some dyno evidence to back up your claim that this is one of the slowest sedans available today???
8. In your final paragraph, you also said, “
you responded with bad and misleading information which leaves you open to correction.” It looks to me like the very same would apply to much of your last post.
As I also stated previously, this sort of exchange is really pretty worthless. Can we move on and quit being ugly and disrespectful of one another? I’m not a Toyota salesman, and I’m not trying to convince you to purchase (or even like) the Prius. If the car, or the concept, or both are not your cup of tea, don’t buy one. But please, don’t come here and tell me you know my own car better than I do, when you’ve never driven one, and clearly don’t know how it works.