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Sedans Toyota Camry 2010 Toyota Camry
570 messages, Last post on Nov 22, 2009 at 9:52 PM
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Replying to: acdii (Apr 06, 2009 8:29 am) There is a good, SOLID, foundation for dethrottling the engine of a FWD or F/awd the very instant wheelspin/slip due to too much engine torque for roadbed conditions is detected. Many of today's RWD and R/awd vehicles also have TC, Traction Control, but the design parameters often differ in that while the moderate braking of a spinning of slipping wheel will still be virtually INSTANTANEOUS, the engine dethrottling will often be delayed. The dethrottling delay will sometimes be for multiple seconds and in some cases only a few hundred milliseconds. Why...?? With loss of traction, wheelspin/slip due to too much engine torque for roadbed traction conditions on a RWD or R/awd the driver still has the ability to maintain directional control. Not so with FWD or F/awd, therefore the design engineers must do their utmost to prevent an extended period of loss of traction on one of these vehicles. So I stand by my statement, while FWD & F/awd vehicles are being made less unsafe via the specific TCS implementation they remain patently UNSAFE. ons. Most learned or experienced 4WD and 4X4 drivers are well aware that it is patently UNSAFE to drive, even on a low traction surface, above dead slow with the front drive engaged. Regretably there is no FWD or F/awd with automatic transaxle vehicle wherein the front drive can be disengaged, nor even QUICKLY disengaged(***) when conditions warrant. *** Of course you could, as the AAA recommends, quickly shift the transaxle into neutral to alleviate the potential from loss of control due to engine compression braking.
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Replying to: 210delray (Apr 06, 2009 5:48 pm) |
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Replying to: wwest (Apr 06, 2009 6:10 pm) I disagree with you though that today's FWD cars are inherently unsafe compared to their RWD peers. If this were even marginally true, where is the evidence -- wouldn't we have seen an increase in deaths/injuries on the roads over the past 30 years when FWD became far more popular among cars? But this really isn't the place to be discussing this...supposed to be talking about the 2010 Camry.
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Replying to: 210delray (Apr 06, 2009 6:23 pm) No, developments and inventions like airbags, ABS, VSC, F/awd and now especially TCS have helped to keep all that in check.
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Replying to: wwest (Apr 06, 2009 10:32 pm) Now that you've had your say on this subject in this forum like you have in every forum you participate in ... let it go. We've heard this same rant over and over and over and over and over and ..... in every FWD vehicle that comes along. We understand your pov. Not that many agree with it but we understand where you stand. Next subject. |
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Replying to: wwest (Apr 06, 2009 10:32 pm) |
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Replying to: wwest (Apr 06, 2009 6:02 pm) Oh and BTW, from a previous post, yes you can defeat the VSC on the Camry, its a secret handshake that does it. 
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Replying to: acdii (Apr 07, 2009 7:19 am)  Why can't Toyota do something so simple?
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Replying to: acdii (Apr 07, 2009 7:19 am) Our '92 has the ability to turn TC off and I developed the practice of doing just that each and every time I started it. On the subject of the Prius as an engineer I understand the TC design. Using the brakes for TC would be a poor compromise when you have linear functionality of the synchronous A/C drive system at hand. |
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Replying to: thegraduate (Apr 07, 2009 7:41 am) Why is TC activating, why has TC activated? Because there is TOO much drive torque being applied to the driven wheels for the level of trcation available.... So think of TC, first and foremost, as an early warning of roadbed conditions. Now that TC has activated what is, should be, your next move...?? Try to "feather" the throttle ever so lightly as to get moving forward without breaking through the "traction barrier". Try applying just enough torque to get the vehicle going forward. Doesn't work...?? Call a tow truck or add traction. Tire chains..?? Most folks with even a minor level of experience driving in wintertime low traction conditions will tell you that disabling TC so as to allow unlimited wheelspin/slip will almost never be of much help. If the slippery "layer" is thin enough that the heat of a spinning tire can break/cut through, then yes. Or if you need to use wheelspin/slip to rock the car back and forth to get unstuck, then again, yes. But keep in mind that had that Prius TC system allowed you to go "spinning out" across that intersection what would you have done if a quick turning maneuver had been required and then, ONLY THEN, you discovered the poor traction conditions...?? What then...!!
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