AdrianH
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| posted on 13/12/09 at 05:20 PM |
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What do you use to get 0 - 60 times?
Just wondering what people use to record their times.
I have a small acern50 and bluetooth gps, tried a programme called auto gps.
Smallest log interval is 1 second and when I tried it there were massive missing gaps in the log or sometimes 5 records in the same second.
Anyone have better recommendations.
Have also an oldish Palm Zire 31 with USB GPS but found any programmes for that to try.
Perhaps I just have to go to a drag strip sometime.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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eddie99
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| posted on 13/12/09 at 05:26 PM |
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Search VI Performance gadget on google... Excellent Item 
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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AdrianH
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| posted on 13/12/09 at 05:30 PM |
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Sorry, I should have said for the kit car, I do not have odbII on that.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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Tatey
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| posted on 13/12/09 at 05:40 PM |
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What about having a second person in the car with a stop watch, it should be more accurate than your gps.
Or if you are any good with electronics, what about 2 light sensors attached the speedo, once the needle moves off the stop it starts a timer and then
once the needle gets to 60mph it stops the timer.
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andkilde
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| posted on 13/12/09 at 05:45 PM |
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SWAG (scientific wild ass guess), gets the best "pub quality" results
That's where all the sub three second times come from IMO...
t
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AdrianH
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| posted on 13/12/09 at 05:55 PM |
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Hi Tatey;
It was your question that got me thinking of this, how would I measure it.
I am working on an acceleration meter that logs but will be a long while off before that is finished.
Would need something from front wheels as they are less likely to have any slip/spin etc. But as front wheel pivots I have no fixed positional
sensor, unless I can fit to the hub.
Thought there might of been something that just logs raw gps data to file, still searching.
Why do I have to make the tools to finish the job? More time then money.
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flak monkey
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| posted on 13/12/09 at 05:59 PM |
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If you have a smart phone, try racechrono.
Its free and seems to be reasonably accurate.
Sera
http://www.motosera.com
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Angus180
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| posted on 13/12/09 at 06:04 PM |
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iphone had a application 0-60 calculator.
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AdrianH
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| posted on 13/12/09 at 06:06 PM |
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Don't have smartphone, I am just to cheap.
Found some aps described on a web page from several years ago that may run on my old palm. They may be what I am after if I can still download
them.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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Stuart_B
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| posted on 13/12/09 at 06:13 PM |
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my dash has it built in. which is a koso digtal dash
black mk indy, 1.6pinto on cbr600 bike carb's.
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scutter
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| posted on 13/12/09 at 06:22 PM |
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I used the drag strip method, as they come to the base once a year For info my Xflow ran 15.01 for the 1/4mile not too fast really.
ATB Dan.
[Edited on 13/12/09 by scutter]
The less I worked, the more i liked it.
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Dave Ashurst
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| posted on 13/12/09 at 06:24 PM |
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I got one of these a while ago.
Not fantastic but it replicated the manufacturer's performance figures for my tin top - which suggests it works. OK for not a lot of cash
perhaps?
(We moved house twice since then and I can't find it any more  )
http://cgi.ebay.co.uk/gtech-performance-meter-pro-0-60-1-4-mile-time-speed_W0QQitemZ250544016401QQcmdZViewItemQQp
tZUK_CarsParts_Vehicles_CarParts_SM?hash=item3a55964c11#ht_500wt_975
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Mark G
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| posted on 13/12/09 at 06:26 PM |
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I use the built in timer on my Koso RX1N instrument pack. Tried an app on my iPhone today and it recorded a 6.4 second time to 60mph. Normally
record a time of around 5 secs. The iPhone also reported a max of 0.6g under acceleration and also recorded 22whp. Somehow I don't think its
very accurate.
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AdrianH
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| posted on 13/12/09 at 09:15 PM |
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I missed the Gtec meter chaps sorry for that, could well have done what I wanted.
Anyway, I have found a long winded but locost way of doing it I think!
I had to over to Windows hence missing the previous posts.
I downloaded an app for my Palm called NMEA log.
All it does is to log the raw GPS messages to an SD card in the Palm from my GPS receiver.
Then When done a few times?
I can stop the application and put the SD card in the PC to review the text files generated.
With a spreadsheet I can the use the RMC messages that have second updates and speed over ground (In knots) Quick conversion factor and I will have
mph every second.
Using the spreadsheet I will then be able to find the 0 to 60 runs and find to the nearest second how I did.
In theory I can also plot the runs on a graph and work out things such as acceleration. That will be for a later test I think.
It looks as though the updates are only done on a second basis so looks like all instruments using GPS tracking will have to extrapolate to get
fractions of a second?
Adrian
Why do I have to make the tools to finish the job? More time then money.
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MikeRJ
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| posted on 13/12/09 at 09:23 PM |
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quote:
Originally posted by AdrianH
It looks as though the updates are only done on a second basis so looks like all instruments using GPS tracking will have to extrapolate to get
fractions of a second?
Adrian
Almost all GPS system have a 1Hz update, though ones with 10Hz are available.
The snag with a 1 second update is the uncertainty about exactly when you started. Extrapolating past the first non-zero point will give errors if
there is any wheelspin etc.
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mark chandler
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| posted on 13/12/09 at 09:50 PM |
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Set up a video camera with timer enabled, just point at the dash and boot it, then deduct the start time from the finish time on playback.
Should be pretty accurate, and you can have multiple goes without having to reset or or click things when launching.
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mediabloke
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| posted on 13/12/09 at 09:55 PM |
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quote:
Originally posted by flak monkey
If you have a smart phone, try racechrono.
Its free and seems to be reasonably accurate.
+1 for racechrono. Although you have wm2003 (the site states wm5 minimum, it's worth a free download & test.
Drag strip is a good idea, not least because of the timing clause in your car insurance...
[Edited on 13/12/09 by mediabloke]
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bi22le
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| posted on 13/12/09 at 10:56 PM |
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second the video camera bt the dash method. I have taken several videos on my phone while in peoples cars. Gives a perfect result. You can do multiple
runs and video evidence.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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morcus
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| posted on 14/12/09 at 01:21 AM |
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I second the passenger with a stop watch method, it has the down side that in a light car the added weight will make a difference but its more fun.
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ban1216
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| posted on 14/12/09 at 07:52 AM |
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I have a veypor digital dash that has accelerometers built in and even has christmas tree lights in to start you off
When configured it will even work out your power like having your own dyno on board lol
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alistairolsen
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| posted on 14/12/09 at 09:18 AM |
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I have a Racelogic AP22 datalogger. It uses accelerometers which should be more accurate then GPS.
My Build Thread
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