Intresting Article On How Magazines Test a Cars Acceleration...
05-20-2009, 04:26 PM
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Intresting Article On How Magazines Test a Cars Acceleration...
Ever wonder how car mags seem to always get really fast times, that are hard, and sometimes impossible to replicate? well edmunds did a fun write up on how they test cars, and how their methods differ from others. Take note of their write up on "rollout", and "Old vs New SAE Standards"
http://www.edmunds.com/insideline/do...mktid=cj260233
Car and driver describes their rollout technique in this article:
http://www.caranddriver.com/reviews/...ollout_feature
Makes me remember some of c&d's old school times:
2001 bmw 330ci 5sp manual: 0 to 60: 5.8sec, 1/4 mile: 14.4 @ 97mph! Try and replicate that at a drag strip!
http://www.edmunds.com/insideline/do...mktid=cj260233
Car and driver describes their rollout technique in this article:
http://www.caranddriver.com/reviews/...ollout_feature
Makes me remember some of c&d's old school times:
2001 bmw 330ci 5sp manual: 0 to 60: 5.8sec, 1/4 mile: 14.4 @ 97mph! Try and replicate that at a drag strip!
Last edited by turkeybaster115; 05-20-2009 at 04:29 PM.
05-20-2009, 05:23 PM
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In the Mid-South meow
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If the title of this thread wasn't so jacked up I'd read the articles, but I've already lost interest. 
05-20-2009, 05:42 PM
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The sizzle in the Steak
I a read magazine acceleration on.
05-20-2009, 06:52 PM
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I drive a Subata.
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me four
05-20-2009, 07:07 PM
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05-20-2009, 08:07 PM
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I drive a Subata.
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ah..
thank you, sir
thank you, sir
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05-20-2009, 10:18 PM
#8
Awesome find Turkey 
I heard that they used VBOX in their tests but never new what models. It was also very interesting in how detailed they where in how they conduct their tests etc.
Over in the 4G TL forum there has been a huge debate since it was released that the times in the Mag reviews are way too slow and its because that the mags didnt know what they where doing....Someone found out that when brake torquing the 4G the transmission would go from 1-2-1 and that this would result in slower times. In turn they found out that by just hitting the gas hard from brake to gas you would achieve the best results. In the end everyone assumed the mags where brake torquing and this is why the results where so bad. Looking at this article you can see that they would have tried the various methods mentioned above and got the best result after all.
I always figured that the mags would do various types of testing in order to get the best launch result.....(being they are the professionals at what they do).
This will finally put an end to that debate.....once again nice find and a very informative article.
I heard that they used VBOX in their tests but never new what models. It was also very interesting in how detailed they where in how they conduct their tests etc.
Over in the 4G TL forum there has been a huge debate since it was released that the times in the Mag reviews are way too slow and its because that the mags didnt know what they where doing....Someone found out that when brake torquing the 4G the transmission would go from 1-2-1 and that this would result in slower times. In turn they found out that by just hitting the gas hard from brake to gas you would achieve the best results. In the end everyone assumed the mags where brake torquing and this is why the results where so bad. Looking at this article you can see that they would have tried the various methods mentioned above and got the best result after all.
I always figured that the mags would do various types of testing in order to get the best launch result.....(being they are the professionals at what they do).
This will finally put an end to that debate.....once again nice find and a very informative article.
05-21-2009, 01:44 AM
#9
^^That still may or may not be the case, the real point, not many people are brake torquing their cars in real life and if they aren't which car is then faster, the one that can't or the one that can but the driver doesn't do it?
There are plenty of other outcomes that don't always hold true by these test procedures, for example rolling start, passing pull, and high speed acceleration beyond the 1/4 mile marker. As good as the tests may be, variables still always exist, and everyone should know better than to take any single result as any vehicle's standard for acceleration.
There are plenty of other outcomes that don't always hold true by these test procedures, for example rolling start, passing pull, and high speed acceleration beyond the 1/4 mile marker. As good as the tests may be, variables still always exist, and everyone should know better than to take any single result as any vehicle's standard for acceleration.
05-21-2009, 10:09 AM
#10
Fahrvergnügen'd
In discussion of the acceleration times of a Mitsubishi Galant GTS:
If you inappropriately apply rollout to 0-60 times and use the outmoded SAE J607 for weather correction, the 0-60 time appears to be 7.9 seconds. We use the more current SAE J1349 and do not use rollout for 0-60 runs, so we would report 8.6 seconds, a difference of some 0.7 second. On quarter-mile runs, where we do include rollout for reasons explained earlier, the difference comes down to correction factor alone, and in this example the difference would round out to 0.2 second and 1.1 mph.
If you inappropriately apply rollout to 0-60 times and use the outmoded SAE J607 for weather correction, the 0-60 time appears to be 7.9 seconds. We use the more current SAE J1349 and do not use rollout for 0-60 runs, so we would report 8.6 seconds, a difference of some 0.7 second. On quarter-mile runs, where we do include rollout for reasons explained earlier, the difference comes down to correction factor alone, and in this example the difference would round out to 0.2 second and 1.1 mph.
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