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Hybrid Vehicles Hybrid Vehicles - Archived Discussions What type of hybrid should I buy? 
453 messages, Last post on Aug 19, 2005 at 6:05 PM
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Hybrid racing has two objectives. They are to cross the finishing line first and to achieve highest MPG. Therefore, tuning the car needs a lot more balancing factors involve. Dennis |
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not "0-60", "30-50 and 50-70 in top gear". Stomp the gas in the manual and it stays in top gear. Stomp the gas in the automatic and it shifts down three gears. THAT'S the difference. HSD in Prius uses an automatic, in the sense you do no shifting for yourself. So the only fair comparison is among other cars in which you do not shift for yourself. As for clutch-drop 0-60 launches, there are some quite sophisticated automatics in the world now that can launch better than their manual counterparts... |
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Although I appreciate one's effort to milk the last MPG out of one's own car, there are many perspective to it. It might make others envy of one's achievement. It can also be view as a torture resistance contest; MPG dictating one's driving behaviors. Trying to achieve highest MPG might even endanger other drivers on the highway because the car isn't going with the traffic flow. Don't shoot the messenger. Either one could be in the positive or negative view. Dennis |
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"Stomp the gas in the automatic and it shifts down three gears. THAT'S the difference." I know. In manual, you have to down shift yourself. Otherwise it'll stay in that gear, like a stubborn kid, thus the worst case situation. Even in automatic tranny, it takes some time to change gear and downshift, especially in the over-drive mode. HSD response is instantaneous. No shifting, no delay, no jerking, no power fluctuation, just smooth like a jet(sorry, got a little excited hahaha). Dennis |
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"Yes, there is a delay from the instant you mash the accelerator and the time the HSD is providing propulsion" You are right. There is a 4 ms (0.004 second) drive by wire delay. The Acceleration sensation curve is superior compare to an automatic transmission. See the third graph on the following page: http://www.toyota.co.jp/en/tech/environment/ths2/output.html Dennis *edited* |
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Hi Usbseawolf2000: ___I have seen the third graph linked and posted in the Priusonline forums … Now look at it closely. Do you know what the instantaneous change in G’s as shown would do to the human body? It’s the same graph I was wondering about in that here is another Toyota presentation with no independent source to verify it is factual? When it says seamless, it certainly isn’t when you first step on the accelerator … It would be almost impossible to achieve the graph as shown other then from maybe a top fuel dragster because your teeth would fly out the back of your head every time you stepped on the accelerator if the Prius accelerated like that. We both know it doesn’t so there is no reason to think it does in any particular mode or under any external condition unless you were hit from behind possibly. There simply isn’t any such thing as the change in G’s in 0 time. I have heard good arguments to the contrary from the Prius posters in the other forum however. ___As for the timing issue, it was more like a ¼ second delay graphed somewhere but I can’t find it just yet. ___Good Luck ___Wayne R. Gerdes |
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"Do you know what the instantaneous change in G’s as shown would do to the human body?" The Y-axis Acceleration (G) does not have any value. I assume the top of the graph is 1G. The graph shows that when you are driving at 30MPH and you hit the accelerator, you will instantaneously feel about 0.4G and increases until 0.65G in 3 seconds. I don't see any reason how a human body can be damaged by that. This would be significantly weaker(probably 1G) than clutch dropping smoke tire acceleration. "There simply isn’t any such thing as the change in G’s in 0 time" Come to NYC and take the subway(electric power). You will feel about 0.8G in 0 time. The classic subway trains(#7) would literally knock you off your foot if you are standing and reading newspaper. That is why they have handrails. Dennis |
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