Green Beastie 453R Posted December 5, 2022 Share Posted December 5, 2022 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. Link to comment Share on other sites More sharing options...
Jonathan Kay Posted December 5, 2022 Share Posted December 5, 2022 Brace yourself... from the archives:Duratec cooling420 coolingJonathan Link to comment Share on other sites More sharing options...
Green Beastie 453R Posted December 5, 2022 Author Share Posted December 5, 2022 Cheerslooks like a common thread given the volume in the archives. Link to comment Share on other sites More sharing options...
Area Representative Geoff Brown Posted December 5, 2022 Area Representative Share Posted December 5, 2022 I believe that the 420 as opposed to the 400 (80c) has a higher temperature T stat fitted. Link to comment Share on other sites More sharing options...
ScottR400D Posted December 5, 2022 Share Posted December 5, 2022 I think it's basically that at around 2016 all the Duratecs changed from having an 82c stat to a 95c one. Link to comment Share on other sites More sharing options...
MattB Posted December 5, 2022 Share Posted December 5, 2022 My Dec 2021 build 420 runs between 85 and 100 indicated, with the fan coming on around 103 indicated.MattB Link to comment Share on other sites More sharing options...
Mrp Posted December 5, 2022 Share Posted December 5, 2022 #6My 2017 is exactly the same Link to comment Share on other sites More sharing options...
Simon420R Posted December 5, 2022 Share Posted December 5, 2022 My 420 runs around 85-100. In traffic it stays at 105 when the fan keeps it there. Link to comment Share on other sites More sharing options...
KnifeySpoony Posted December 6, 2022 Share Posted December 6, 2022 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. Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted December 6, 2022 Share Posted December 6, 2022 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. Link to comment Share on other sites More sharing options...
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