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.

URL for the lazy :D

Or...

http://www.performanceexhausts.net/Race-Technology.html

:D

Jamie
www.performanceexhausts.net

Just ordered one from Jamie, very helpful, and has loads of stuff..

All I need todo now is get home to try it out...

Nate

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.

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?

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.

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

http://upload.turbosport.co.uk/galle...3835267238.gif

nb Power is at wheels !!



[Edited by Cosie Convert - 3/13/2002 1:52:58 AM]

19psi = 3.9bar? :confused:

fuel press 3.9 bar :rolleyes: wondered how long that would take ;)

Nate

Should be arriving tomorrow, hope you enjoy it mate! :D

Let me know if you fancy those lovely wheels or the intercooler.

Jamie

www.performanceexhausts.net

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

Hitting around 38 in 1st gear?!

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]