RX3 Cooling System

katflap · 01-26-2017, 11:36 AM

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

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01-26-2017, 11:36 AM	#11
katflap Join Date: Jan 2015 Location: England Posts: 382	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
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