Performance measuring on the cheap

[Whubbsie]

Here's one for any Iphone owners

http://www.autoblog.com/2008/07/29/d...ormance-meter/

One app that has us really psyched is a new automotive performance meter called Dynolicious from BunsenTech. It uses the accelerometer inside the iPhone to let you record 0-10 through 0-100 times, quarter mile and trap speed, Lateral Gs, horsepower and more. Results are also displayed in real-time on the phone itself with graphs and a speedometer

okay not so cheap if you don't have an Iphone

[Timbo]

Accelerometer based tools, such as G-tech, are a bit hit and miss. If this also hooks into GPS, it might be a bit more accurate. As an unapologetic gadget freak I'll probably get this, and report on results

[JustCruisn]

Go for it Timbo
Take it on a real drag strip and post back the different times + speed.
Accurate to 1.5 mph

[Whubbsie]

Even if it's not that accurate it would still be a good way to test out ball park improvements from mods, till you can get some real tests done wouldn't it?

[Sharkie]

I've seen reports from dragstrip tests against the G-Tech Pro with only thousands of a seconds difference. Its pretty good.

Who cares if it is 0.003s out over 400m

[RhysQ]

I've seen reports from dragstrip tests against the G-Tech Pro with only thousands of a seconds difference. Its pretty good.

Who cares if it is 0.003s out over 400m

it could be the difference between a 13.997 sec pass and a 14sec pass

[Timbo]

I've seen reports from dragstrip tests against the G-Tech Pro with only thousands of a seconds difference.

In my experience, even when you set it up with painstaking care, the G-Tech Pro is not consistent, ie, against a set of time slips. You're right, on some runs it might be 0.03s out, but on the next it might be 0.3s out

[JustCruisn]

For 15bux it would be worth it for the fun factor, thats about it.
I rekon you could have a comp with your mates to get the biggest G reading around a corner.

[RhysQ]

For 15bux it would be worth it for the fun factor, thats about it.
I rekon you could have a comp with your mates to get the biggest G reading around a corner.

my head unit in my car (Kenwood XXV-01D 25th Anniversary Edition) has a g-force meter in it...works a treat. good fun from the lights and on the twisties watching the little ball on the LCD display getting thrown around.

[The_Hawk]

For lap timing you can use this for a Nokia S60 phone too:

http://www.racechrono.com/?lang=en

[GT3]

I consistently ran my G-Tech Pro against the drag strip timers for comparisons on at least 20 - 25 runs. I found the accuracy a bit hit and miss, sometimes it was within 0.01sec, other times it was out by almost 1 sec.

The G-Tech pro is handy for analysing your runs afterwards. Using the plot feature, you can work out where you lost traction, at what rev you changed gear, how quickly you changed while maintaining power etc. That's handy for working out the ideal rpm for changing gears, eg if you can hold 160kmh in 3rd, you may be better off not changing into 4th.