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Larger dia tyres will use more fuel... but... don't forget you will now travel further than your Odo thinks you have.Quote:
Originally Posted by Sprock
If you haven't already done so you will need to check your Odo calibration and use a fiddle factor in your distance travelled.
Note that your Odo error may possibly be significantly different to your Speedo error.
Yeah that's what I would've thought so I checked the speedo against my GPS speed reading & it didn't seem change ? I expected it to as the difference between new & worn tyres on the drive of the truck is about 3-4kmh ... I'll do some more testing as I was more excited about putting the chip on it at the time .
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32" in a AT build with a HWY pattern is closest to OE
I lot here get very good return running 265s/32"x 10.5"
down into single figures for some. I run a 11.5" x 33" [mud]
and get about 13-15/100k depending, speedo is consistant with the GPS
As posted you can't necessarily go by the speedo reading errorQuote:
Originally Posted by Sprock
Speedos are required by law to be dead accurate or overread ex factory but not so the Odo's
Speedo will normally overread a tad ex factory and going to 33's usually gets them very close to actual
Odos are usually very close ex factory and 33's will get them to underread a tad
Definitely not always the case but more often than not in my experience
Rito mate thanks
2002 GU wagon 3.0lt , auto , piranha dual batteries , 3" lift , chip , needle & Dawes valves - just gettin started
When you say 'a tad ' how much do you reckon ? Roughly ? ie; 1000kms on odometer would be .......1050kms ? Or not that much ?Quote:
Originally Posted by the evil twin
2002 GU wagon 3.0lt , auto , piranha dual batteries , 3" lift , chip , needle & Dawes valves - just gettin started
Well when I went from 31" to 33" my speedo went from being 8k behind at 100km/h to smack on 1-1 with the GPS. .Quote:
Originally Posted by Sprock
When I was coming home from the farm (about 600k) my odometer was about 40k short of the distance traveled via GPS. .
So it can be a fair bit..
Rito Westy thanks mate
2002 GU wagon 3.0lt , auto , piranha dual batteries , 3" lift , chip , needle & Dawes valves - just gettin started
Same as Kallen ,,,,, I heard vehicle manfacturers were allowed 10% error in speedo readings.
Get a speeding ticket they only give you 3% error funny eh
Agree with Westy... Once you 'know' your errors it is a lot easier and you only need to sort it out once
The Odo to Speedo relationship can be up to 10% or more and won't change with tyres, diffs etc
Lets assume (rough figures for example only)...
The Speedo indicated to actual is out, say 7%, and reads 107 at 100 actual and you then increase the tyre size by say 7% (31's to 33's) it will now be spot on
The Odo indicated to actual is out, say 1%, and reads 101 for 100 K's travelled and you then increase the tyre size by say 7% (31's to 33's) it will now read 94 K's for every 100 travelled
If you change the size of the tyres by another 7% ish (33's to 35's) the errors will change by the same percentage
If you change the diff ratios by 5% ish by going from say 4.3 to 4.1 the errors will change by the same percentage