Pocket Dragstrip to measure your cars performance?
12 March 2002, 10:26 AM
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Check this...
It's a pocket dragstrip - anyone got this? May save me money spent on rolling road!
http://www.race-technology.com/WebPage/Products/Accelerometer/ac22/Ac22Introduction.html
Sounds too good to be true. And accuracy up to 1/100th sec?
If this is really good, maybe we should arrange a group buy.
It's a pocket dragstrip - anyone got this? May save me money spent on rolling road!
http://www.race-technology.com/WebPage/Products/Accelerometer/ac22/Ac22Introduction.html
Sounds too good to be true. And accuracy up to 1/100th sec?
If this is really good, maybe we should arrange a group buy.
12 March 2002, 11:32 AM
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12 March 2002, 12:42 PM
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Just be aware - you need some fairly prescise data for this machine to be accurate
weight of car fr example - but also (i believe)
suspension set ups and so on - all information available but if you have a modded car you need to get some adjustments in their.
weight of car fr example - but also (i believe)
suspension set ups and so on - all information available but if you have a modded car you need to get some adjustments in their.
12 March 2002, 12:54 PM
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To get 0-60 times, well you can do it out of the box, right?
What info do you need apart from weight?
I've downloaded the manual from their website...having a read over it.
For a cloassic Impreza, where is the best mount point?
What info do you need apart from weight?
I've downloaded the manual from their website...having a read over it.
For a cloassic Impreza, where is the best mount point?
12 March 2002, 01:08 PM
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The reason you need car setup data is because the pocket dragstrip uses an accelerometer (g-sensor) for its calculation and measurement process. It uses Newton's Laws to calculate power etc, so it needs the mass of the car. Because it is sited inside the car, as the car squats under acceleration, the whole body tilts. This means that the accelerometer is no longer parallel to the road and records some of the forward acceleration and some portion of gravity. If you know the suspension setup, you can work out how much of each is occurring and compensate accordingly. Accuracy of these things is OK for short distances, i.e. a 1/4 mile,or a 0-60, but eventually you get sensor drift, particularly if the road is no flat.
P.S. The cops have been using similar devices for the last few years to measure how quickly you decelerate in an accident so the technology is proven.
P.S. The cops have been using similar devices for the last few years to measure how quickly you decelerate in an accident so the technology is proven.
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13 March 2002, 01:19 AM
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I use one for engine tuning. My 1/4 mile time and speed was within 0.2 secs and 1 mph of an actual timed run. Brilliant !
One of the many graphs that can be produced shown below
nb Power is at wheels !!
[Edited by Cosie Convert - 3/13/2002 1:52:58 AM]
One of the many graphs that can be produced shown below
nb Power is at wheels !!
[Edited by Cosie Convert - 3/13/2002 1:52:58 AM]
wondered how long that would take 
14 March 2002, 01:18 PM
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That is one seriously low-geared car! Half-way through 3rd gear to get to 60, but still covered in under 4s, into 5th gear at 90mph... what on earth is this car CC? Cossie Westfield or something? 
Richard
Richard
14 March 2002, 06:02 PM
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Nothing quite as exotic ! It's my MY95 WRX ra with a few mods 
but standard 'manic' gearing !
Andy
Same 1st gear as MY95 UK car but my 5th is the same as UK 4th gear.
Changes were at 7000rpm.
0 - 60 is 4.3sec (the time ref is below each line)
[Edited by Cosie Convert - 3/14/2002 6:08:10 PM]
but standard 'manic' gearing ! Andy
Same 1st gear as MY95 UK car but my 5th is the same as UK 4th gear.
Changes were at 7000rpm.
0 - 60 is 4.3sec (the time ref is below each line)
[Edited by Cosie Convert - 3/14/2002 6:08:10 PM]
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