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0-60 Speed

11 messages,  Last post on Mar 16, 2008 at 1:11 PM

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What is this discussion about? Mazda CX-9, SUV

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#9 of 11 Re: gotta love engineers! [kj123] by 99zoomr Feb 11, 2008 (1:05 pm)
Replying to: kj123 (Feb 11, 2008 9:24 am) No engineering degree here, but if my slower CX-9 gets to the next red light 2 seconds later than a quicker car, then they'll have to wait at the red light 2 seconds longer than I do...
#10 of 11 Re: 0-60 Speed [tidester] by c_rex Mar 15, 2008 (11:15 pm)
Replying to: tidester (Feb 07, 2008 11:41 am) "Then you should have realized that your original question was ill-posed!" The question was not at all ill-posed, rather- misunderstood. It is a very physics oriented question to ask for quantitative and measured results. It would take someone who has driven a similarly equipped vehicle with each set of wheels mounted to answer. I'd like to know the answer to this question too!   "At 60 mph, neither is quicker." Not entirely true. If you mean that they travel at the same 'speed' this is accurate. Quicker can also mean 'more agile' or has greater velocity (acceleration (rate of change in speed)). The effects of reducing unsprung weight in rotational mass can have a huge impact on acceleration. This is a performance AND fuel efficiency question. So at 60 mph- which set will get to 80 mph in the least amount of time?   I've only got an Accounting/Finance degree but I aced all my college science classes 20 years ago. Doesn't mean I know what I'm talking about now though. Replies to this message: tidester (Mar 16, 2008 1:11 pm)
#11 of 11 Re: 0-60 Speed [c_rex] by tidester HOST Mar 16, 2008 (1:11 pm)
Replying to: c_rex (Mar 15, 2008 11:15 pm) The question was not at all ill-posed, rather- misunderstood.   Actually, it wasn't misunderstood. It was misstated.   The effects of reducing unsprung weight in rotational mass can have a huge impact on acceleration.   Quite correct! Additionally, you lose a little mechanical advantage with larger wheels so your acceleration will be reduced.   tidester, host SUVs and Smart Shopper

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