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6th October 2010, 12:34 AM
#1
Beginner
GQ on road speedo variances
Hi guys, this is my first time on a forum, not sure if this is the first time this question has been asked but I have 285/75/16's on a GQ 4.2 carby and at 100km will my speedo be out and if so roughly by how much? I drive on the freeways at 95km and all cars fly past me but I don't want to risk going over the speed limit as in WA the coppers have cameras everywhere over and have numerous fines (have a heavy right foot which I need to lighten)? Any advice would be greatly appreciated.
Cheers, Jimmy
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6th October 2010 12:34 AM
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6th October 2010, 03:22 AM
#2
Patrol Guru
Hi Jimmy,
I would have the speedo calibrated as there could be several reasons why your speedo could be out. I did a search on google and came up with these guys http://www.ahgwa.com.au/Duncan_Nissa...ts.php?dept=32
Cheers,
Rob
Just about to jump into my next Patrol. A 2001 GU II TB45E .
WARNING!: Do not ever use a towball as a recovery point. They are not rated and can become a deadly projectile during a recovery if they snap off, and they have done so with tragic results in the past.
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The Following User Says Thank You to rkinsey For This Useful Post:
JimboGQ (6th October 2010)
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6th October 2010, 07:54 AM
#3
Bitumen Burner
Hi Jimmy.
Welcome to the forum. From memory, there's a place called Australian Instrument Services (AIS) in Perth somewhere, that re-calibrates speedos.
Take care out there.
Ross
DX grunt
Edit: May be Allied Instrument Services or Aust Instr Svcs. can't remember.
Last edited by DX grunt; 6th October 2010 at 09:14 AM.
Winner of 'Best 4 x 4 ' at the 2017 Albany Agricultural Society Inc - Town n Country Ute Muster.
Ex Telstra - 2005, 4.2 TDi ute -with pod and more fruit than a grocery shop.
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The Following User Says Thank You to DX grunt For This Useful Post:
JimboGQ (6th October 2010)
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6th October 2010, 09:07 AM
#4
Banned
Hey Jimmy
same goes for me - have a set of 285/75/16's and when I sit behind my mates brand new BT50 with him on 100, I am only doing about 94 (ish) ... not sure of WA, but in QLD now it is illegal to have ANY level of over speed calibration on the speedo itself (there was an ADR that allowed for up to 10% either way originally, but this has now been canned for the new guidelines) - i.e. not only can you get done for speeding, but if you mention you were only doing 100 to the boys in blue, they can order a mechanical and ping you for the over estimation on the speedo calibration also ... definitely worth just taking it to one of the joints mentioned above for peace of mind - if they are anything like here in QLD, they will under calibrate by about 2-3% (i.e. when you are sitting on 100, you'll actually be doing about 98 etc).
Good luck with it ... they are cracking down on this everywhere by the sounds of things ...
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The Following User Says Thank You to Bigrig For This Useful Post:
JimboGQ (6th October 2010)
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6th October 2010, 01:21 PM
#5
Beginner
Thanks guys for the replies and definately will get it looked at.
Cheers again, Jimmy
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9th November 2010, 02:19 PM
#6
Hey Jimmy,
Just to let you know that Marks 4wd does a speedo calibration electronic box to fix the problem too.
mmmm its a v8.... i'll have me one of those.....
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The Following 2 Users Say Thank You to kopyme For This Useful Post:
fixer982 (6th May 2011), JimboGQ (25th November 2010)
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25th November 2010, 08:43 PM
#7
Beginner
Thank's kopyme I have just ordered a calibration box as it will be quicker for me to order online and fit on a Sunday than getting time off work. I was going to get the old girl calibrated over the Christmas break but this will work out a lot better. Cheers again to all the above for their imput.
Jimmy
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26th November 2010, 08:48 AM
#8
Advanced
I have the same problem, I run 285/75/16's...
Lined up my speedo, odometre against my GPS and found about a 5% variance. I haven't worried about the marks adaptor. Just keep it in mind when travelling.
B
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27th November 2010, 01:15 AM
#9
Patrol God
Getting Older Is Unavoidable, Growing Up Is Optional!
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1st December 2010, 01:37 PM
#10
All cars have "error" between speedo reading and actual speed. If the error is about 5% or less, then best to live with it. If you can't, then buy tyres with 5% larger rolling diameter - you can check this by putting a white spot on your current tyre and mark the ground, then the vehicle forward until the tyre rotates 360 degrees and measure the distance travelled. Your proposed new tyre should be 5% more - don't take all said in tyre brochures as gospel. The travelled distance does not have to be millimetre perfect, an error of say 3mm in 2.4 metres will be negligible.
You say you have a "lead foot" - use a bit of reverse phsychology on yourself, leave the speedo as it is and you will find that you will drive to 100Km shown on the speedo (or a bit over), keeping you within the speed limit.
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