70c and 85c Thermostat comparison
Though, unfortunately not an exact comparison
Both graphs are a 10-15 min trip of the same route. At a starting temp of approx.25c.
Graph 1 (coolant temp 1), is the 70c stat, this trip was made in the summer with an air temp of between 15c and 20c.
Graph 2 ( coolant temp 2), is the 85c stat, this trip was made recently with an air temp of 7c.
Other differences for graph2 is that I have a thermostat bypass fitted and also radiator covers.
The bypass probably accounts for the smoother graph line.
With the hotter stat, I have noticed a decrease in fuel consumption, gaining an approx. 20miles per 8 or 9 litres.
That said, I removed my top box at the same time as changing the stat. This could influence the fuel economy.
Why does the temp never reach the thermostat rating ?
My guess is that the cooling system is too large
