420-R Running Temp

[Green Beastie 453R]

Just picked  up a new 420-R and noticed it was running at about 95 C at 70 on an an A-road.  Does this Duratec have a different rated stat. 

[Jonathan Kay]

Brace yourself... from the archives:

Duratec cooling

420 cooling

Jonathan

[Green Beastie 453R]

Cheers

looks like a common thread given the volume in the archives. 

[Geoff Brown]

I believe that the 420 as opposed to the 400 (80c) has a higher temperature T stat fitted.

[ScottR400D]

I think it's basically that at around 2016 all the Duratecs changed from having an 82c stat to a 95c one. 

 

 

[MattB]

My Dec 2021 build 420 runs between 85 and 100 indicated, with the fan coming on around 103 indicated.

MattB

[Mrp]

#6

My 2017 is exactly the same

[Simon420R]

My 420 runs around 85-100. In traffic it stays at 105 when the fan keeps it there. 

[KnifeySpoony]

I have a Spa digital gauge - It runs at a rock solid 92C when underway. In traffic/idling, the fan comes on at 98C. Based on the numbers you guys are seeing, I wonder if my gauge reads low, or the OEM gauge reads high.

[aerobod - near CYYC]

There are a couple of variables in the actual temp vs the displayed temp:

- the ECU and temp gauge use different sensors in slightly different positions;

- the MBE ECU calibration curve that Caterham uses is not 100% accurate and there is some resistance variation between sensors anyway, leading to up to about 10C possible variation, from my experience of trying to get an accurate calibration curve for the sensor my unlocked ECU uses.

With my car, the ECU and dash gauge agree at normal operating temps within 1C, I also have adjusted my fan set points to activate at 90C and deactivate at 85C, to match my 82C thermostat. To determine the ECU fan set points with an MBE ECU (normally 9A4 on a 420R), Easimap is needed.