Tuesday, May 01, 2012 at 14:57
My thoughts on changing tyre sizes.
I think what you really need to monitor changes to the tyre sizes on your vehicle are,
GPS unit for true speed,
A Scangauge or similar to monitor fuel usage on the fly,
And an exhaust gas temperature gauge to see how hard your vehicle is working.
Using the Speedo and Tacho only will give you the same reading no matter what the tyre size fitted as their pickup of from the engine and drive train, before the tyre.
The GPS will give you an accurate speed reading with each tyre size fitted. This is independent of the vehicle’s own speedo.
The Scangauge can monitor the fuel use and shows if the gain from the tyre size is worth the extra speed, or if you are using more fuel to maintain extra speed. Even though the Scangauge works from the vehicles computer, it will register the different fuel volume usage under different conditions.
Measuring and monitoring fuel flow and usage over a given journey will show if there is any improvement in economy.
The Exhaust Gas temperature gauge can show if you are overworking the engine and/or causing premature wear by changing tyre sizes.
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