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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Speedo error on new T-31
John,
The T31 is using the same process as the Series II T30 in terms of the speed signal transmission.
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27/Mar/2008, 7:30 am
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Snoopy6
X-TRAIL NEWBIE
Date Registered: 03-2008
Location: Port Kennedy, West Australia
TOTAL POSTS: 30
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Re: Speedo error on new T-31
Thanks Jalal. I guess the CAN signal is some sort of serial bus but it would be nice if it was just a fancy name for a DC wire.
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John ... 2008 Ti, CVT, Twilight, factory nudge, roof bars, canoe/kayak carrier, colour coded door protection mouldings, tow bar, K&N air filter, HID (4300K) headlights.
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28/Mar/2008, 9:58 am
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re:
Yep, that is normal and within the allowable 10% difference.
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27/Feb/2012, 1:04 pm
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Charlie250
X-TRAIL ENTHUSIAST
Date Registered: 08-2012
TOTAL POSTS: 193
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Re:
The error on a series IV diesel is a more than 5%. When I did my test drive, the speedo indicated 110km/h but according to the GPS I was only doing 103. At an indicated 120, we were doing 112.
225 x 70 R17 tyres will remove most of that error.
Under Australian standards, the allowable error tolerance is 10% + or - 4km/h.
This means that when the speedo indicates 100km/h, it complies with the Australian standard when the vehicle is actually travelling at anywhere between 86km/h & 114km/h!
Last edited by Charlie250, 27/Feb/2014, 5:00 pm
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X-2634 2012 Series IV TS Man, Kings Springs, Bridgestone D697's, High Tech Exhaust, Turbo Timer, DBA Slotted Rotors, QFM HPX Pads, Tow Bar, Cargo Barrier, UHF, HID Dr Lights, LED Light Bar, K&N Filter, Bonnet Struts, & Premium Tint
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27/Feb/2014, 4:45 pm
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valkie
X-TRAIL NEWBIE
Date Registered: 04-2014
Location: Central Coast NSW
TOTAL POSTS: 91
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Re:
Sorry guys, its the guvments fault.
Several years ago, way back in the dark ages, the speedos were allowed to be + or - 10%
The car manufacturers tried to keep them within 5% either way resulting in about 5% variation.
Govco invented and introduced that wonderious of all revenue tools, the Greed camera and people were being pinged for being over the limit and fought it in court stating and proving speedo error.
To make it easier for Govco to reel in the revenue without so many protests, a law was changed (again) to make you responsible for your speedo accuracy. (remember this was before GPS)
As a result again people were pinged, but this time it was their fault for not having calibrated speedos.
The manufacturers then had some hard work to do, either have more accurate speedos or make them all read below the vehicles actual speed.
As a result the speedo on any car manufactured after 1985 (I think) will read more than the actual speed, depending on the speedo accuracy this could be up to 10% faster than actual, but never slower.
But to be fair to the manufacturers, tyre wear, inflation pressure, tyre size and several other factors could influence speedo error.
I had a mate who put low profile tyres on smaller rims and swore blind the new tyres made his car faster.
When we checked, his speedo was was reading 15klm faster than he was travelling, and all those corners he was going around faster, were actually being negotiated at the same speed, just not on his speedo.
Thus endith the lesson.
Last edited by valkie, 5/May/2014, 3:09 pm
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2010 T31 Series III 2.5 White Automatic CVT
A vehicles real purpose in life is to tow a boat
Guy Fawkes is my hero (Born 13/4/1570, Murdered 5/11/1605)
He was only trying to do the right thing
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5/May/2014, 3:06 pm
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