ENVY-T CNUTOX Donating Members 3,098 Member For: 21y 11m 6d Gender: Male Location: Not sure? Posted 25/08/05 10:40 PM Share Posted 25/08/05 10:40 PM At those speeds it seems to read over by about 3-4 k’s going by the average speed on the trip meter. I.e. setting the cruise control and resetting the average speed.Trent.I have noticed this also. And when we past a speed check point it also registered 67 when we were doing smack on 70. Link to comment Share on other sites More sharing options...
ZAP No boost, no bottle, just my foot on the throttle! Lifetime Members 7,935 Member For: 20y 9m 28d Gender: Male Location: Sydney Posted 25/08/05 10:42 PM Share Posted 25/08/05 10:42 PM The police speedo can be turned on at any dealer with the WDS.They should do it free if they are a nice dealer.This option will put a digital speedo in the right LCD window with a big P next to it.The only bummer is that you loose all the trip meters, but I do not care about milage. Link to comment Share on other sites More sharing options...
harvyk Member 1,070 Member For: 19y 9m 11d Location: The North Cooma End of Canberra... Posted 26/08/05 03:21 AM Share Posted 26/08/05 03:21 AM Speedos can vary during trips...A couple of years ago I did a trip around Vic with the missus, and there where certain point in which they had the speed radars that simply report back the speed... The first one I went past I was sitting on exactly 110KM/h and the sign said I was doing 107km/h, that seemed ok as I had been driving all day (drove down from canberra so the tires where pretty warm)...The next day once again sitting on exactly 110km/h and this time the sign said I was doing 113km/h... The difference was that this time my tires where still cold... (It was a cold morning and I hadn't just spent all day driving...)This was in a '02 laser with half decent tires... (Can't remember which brand) but it proved to me that the speedo can never be 100% accurate and whilst the angle which the speed radar took my speed at probably made a difference I can’t see it being a 6Km/h difference… (as each time I was sitting dead straight in my lane) Link to comment Share on other sites More sharing options...
IH8TOADS Silver Donating Members 3,618 Member For: 19y 5m 4d Gender: Male Location: OZ Posted 26/08/05 03:45 AM Share Posted 26/08/05 03:45 AM I hav been past those warning signs in Perth and they keep saying slow down and wont give me my speed!!! However I will test on my hand held GPS. This is pretty darn accurate. I have found in the past that putting slightly larger wheels has brought the speedo to dead accurate due to increased rolling diameter. Link to comment Share on other sites More sharing options...
AWW XR6T UTE Member 129 Member For: 21y 7m 6d Location: Brisbane Posted 26/08/05 04:41 AM Share Posted 26/08/05 04:41 AM I have checked my speedo with GPS, and with the original 17 inch wheels, a true speed of 97 km/h, the speedo showed 100 km/h, and with 19 inch mags it reads right, 100km/h = 100km/h on the speedo. Link to comment Share on other sites More sharing options...
Paradoxx Colossal Member Member 5,049 Member For: 20y 3m 18d Gender: Male Location: Perth, WA Posted 26/08/05 04:54 AM Share Posted 26/08/05 04:54 AM Yeah I think they take that into account when producing the car also, they wouldnt make a different sensor so they make it as accurate as they can across the entire range of falcons and different wheel sizes. But still, being an electronic pickup it's much easier to adjust than having to change cog sizes! I'm surprised there isn't some sort of trim control. Link to comment Share on other sites More sharing options...
Guest Senator Guests Posted 26/08/05 08:52 PM Share Posted 26/08/05 08:52 PM Our speedos are that inaccurate police vehicles, dont use them for speed measuring and they are deemed uncalibrated. Instead they rely on old trusty Silver Eagle, as long as its not raining or a really windy road. And if that fails, the hair dryer (Lidar) is pointed out the window. So police have no excuse for speeding unless there in a hurry. Link to comment Share on other sites More sharing options...
BADBOSS Member 73 Member For: 20y 8m 22d Location: Start of the Yarra Valley Posted 27/08/05 12:10 AM Share Posted 27/08/05 12:10 AM I tried a hand held GPS and found my speedo to read around 2kph slower that actual,so that's ok as far as I'm concerned Link to comment Share on other sites More sharing options...
YOOT Member 1,201 Member For: 21y 5m 23d Location: Birkdale Posted 27/08/05 12:41 AM Share Posted 27/08/05 12:41 AM I have tested my speedo a 6 times on the speedo check alond the Bruce Highway up to Harvey bay/Bundaburg. Its 5km starting at 0km at the first sign.Every 1km sign I passed my trip ticked over 10m past the sign, by the 5km sign I was 50m past the sign when the trip ticked over 5km. This indicates that the speedo (which is directly connected to the trip since speed over time is distance traveled etc) is out by +1%, or in other words when I put the dial on 100kmh I am realisticly travelling at 101kmh.This suits me fine, since I like to be able to set my speed where I want it. If I want to for 10% over the limit so speed cameras and police can't book me, then I can.I've had this confirmed on the last dyno run I had.I am on 17" tyres. Original SP3000s. Link to comment Share on other sites More sharing options...
saleen Big Gun Donating Members 4,170 Member For: 22y 2m 2d Gender: Male Location: NSW Posted 27/08/05 05:23 AM Share Posted 27/08/05 05:23 AM I have the police speedo option and it is accurate +/-1km/hWouldn't yours be out cause your car runs at a higher altitude to everone else? Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now