Dunsfold Dave Posted July 12, 2006 Share Posted July 12, 2006 I have just fitted a triple pass? rad and larger fan with ECU control. Does anyone know at what temp the fan is supposed to start. I didnt have time tonight to check every thing but I ran it up tp 76deg and fan had not started. At what temp can I expect it to kick in? DD Link to comment Share on other sites More sharing options...
caterhamnut Posted July 13, 2006 Share Posted July 13, 2006 Hi Dave - I think it is quite high - maybe 85 degrees plus? That is a guess, but certainly higher than 80....someone will come along and confirm later I am sure!! btt www.mycaterham.com here 91,000 miles -1st 1.6k Supersport, '95 Motor Show car Link to comment Share on other sites More sharing options...
Myles Posted July 13, 2006 Share Posted July 13, 2006 Which ECU... ...the Emerald can turn it on at any temp you choose if you've wired it in... Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Dunsfold Dave Posted July 13, 2006 Author Share Posted July 13, 2006 ECU? Not sure I think it says BRE?? on the cover. Its the standard R400 road unit I presume. Link to comment Share on other sites More sharing options...
A10ROX Posted July 14, 2006 Share Posted July 14, 2006 Mine is (as Caterham built) set at 69dgeC, if that's any help A10ROX:OK, its an R500 without the magnesium bits sump etc and only 205bhp! Edited by - A10ROX on 14 Jul 2006 13:16:32 Link to comment Share on other sites More sharing options...
noddy Posted July 14, 2006 Share Posted July 14, 2006 Dave, the standard Caterham ECU cuts the fan in early (65-69 ish), make sure you have fitted a fuse in the relay thingy bit R400 BYEeeeeeeee .......... I love it Link to comment Share on other sites More sharing options...
caterhamnut Posted July 14, 2006 Share Posted July 14, 2006 Blimey - thats much lower than I thought!! Isn't that before the thermostatt, or am I missing something really obvious here?! www.mycaterham.com here 94,000 miles -1st 1.6k Supersport, '95 Motor Show car Link to comment Share on other sites More sharing options...
noddy Posted July 14, 2006 Share Posted July 14, 2006 Yes it is low and yes I have asked Caterham if it's correct and the answer was YEP R400 BYEeeeeeeee .......... I love it Link to comment Share on other sites More sharing options...
timbo Posted July 14, 2006 Share Posted July 14, 2006 angus ... set the fan switch values yourself to suit your eng. remeber the emerald normally reads about 10 degrees higher. firstly set the on switch value high... say 98 on the emerald. Run the eng. Keep your hand on the large stat hose. At the same time keep your eye on the the emerald temp reading. When you feel the stat begin to open keep that temp value as a ref. When you feel the stat circuit fully open, keep that value as a ref. Essentially once you know the stat temp operation in reference to the emerald coolant temp reading, set a switch 'ON' value, say 10-12 degrees higher. Set the switch 'OFF' value 4-5 less than the switch 'ON' value, making sure the stat is still open at this 'OFF' switch value. If the fan runs too constantly, simply adjust the switch values to suit your requirements. I have my Duratec switching on @ 95 off @ 91. The K will be soething similar assuming a 82 degree stat. SV 2.3 Duratec and for the last time, no it is not a truck Link to comment Share on other sites More sharing options...
timbo Posted July 14, 2006 Share Posted July 14, 2006 sorry ... my rambling assumed you had an Emerald.... I think Myles threw me off. SV 2.3 Duratec and for the last time, no it is not a truck Link to comment Share on other sites More sharing options...
caterhamnut Posted July 14, 2006 Share Posted July 14, 2006 Cheers Timbo - we don't have an Emerald (fitted, yet!) but I am surprised the standard Rover ECU is set so low?! Our standard 1.6k Supersport's fan comes on at about 85 plus.... www.mycaterham.com here 94,000 miles -1st 1.6k Supersport, '95 Motor Show car Link to comment Share on other sites More sharing options...
timbo Posted July 14, 2006 Share Posted July 14, 2006 Your right Angus... I would not expect a fan to operate on any eng below 80.... the engine is just not up to efficient operating temp at anything less. I remember trying a 72 degree stat on my SV 1.8 K modified using a radtec rad. I couldn't get any heat into the engine at all. I had to block off the bottom 3rd of the rad. In the end I dumped the 72 and fitted an 82. SV 2.3 Duratec and for the last time, no it is not a truck Link to comment Share on other sites More sharing options...
caterhamnut Posted July 14, 2006 Share Posted July 14, 2006 Yep - we have the same timbo. www.mycaterham.com here Videos here 94,000 miles -1st 1.6k Supersport, '95 Motor Show car Link to comment Share on other sites More sharing options...
Dunsfold Dave Posted July 16, 2006 Author Share Posted July 16, 2006 The relay supplied with the ECU kit was faulty I have installed a working one and the fan starts at ....69deg. Driving yesterday in heavy traffic in very hot weather my temp never got higher than 80deg. I was having overheating problems which is why I have installed the triple pass rad and larger fan, but before doing this I removed the stat just in case it was the problem, so I am running without a stat at present. DD Link to comment Share on other sites More sharing options...
Mike C. Posted July 16, 2006 Share Posted July 16, 2006 Dave, Mine was coming in at 70C but Caterham re-programmed the ECU to 80C. Incidentally, is your fan mounted behind or in front of the new rad? If in front, do you find it noisy when it's on? Mad Manx Link to comment Share on other sites More sharing options...
A10ROX Posted July 17, 2006 Share Posted July 17, 2006 Pardon 🤔 At least you know it's working 😬 A10ROX:OK, its an R500 without the magnesium bits sump etc and only 205bhp! Link to comment Share on other sites More sharing options...
Dunsfold Dave Posted July 17, 2006 Author Share Posted July 17, 2006 Mike Its in front of the rad and yes it is a bit noisy. So perhaps I should get it reprogrammed to 80deg. I did check through the Stack programmables and the standard road stack that Caterham install limits what is user adjustable. What is the optimum running temp for the R400 road engine? DD Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted July 18, 2006 Support Team Share Posted July 18, 2006 It makes no sense whatsoever to start the fan before the stat is fully open - your are just cooling still water in the rad. Standard Caterham stat is 88deg, many people use an 82deg stat (me included) and the R500 stat is 74 deg. On my Emerald controlled high power K, the fan is set to come on at around 96 or 98 (can't remember which) and off again at about 92 - this works fine (and is about what the normal fan switch is supposed to do). The fan should only really be required when you are stationary or moving very slowly - at any decent speed the airflow from the car moving will be much greater than the fan can produce. At the Longcross sprint on Saturday, waiting in the queue with the engine fully up to temperature, the fan cut in and out as necessary to keep the temperature in the low nineties on average - as soon as I started the run, the temperature very quickly dropped to 80ish. I think people get a bit panicky about K series temperatures and try to overcool the engine - I am sure this is not the right thing to do as the engine needs to get the oil up to its correct operating temperature. Even in the heat of this weekend, my oil temperature never got over 80 deg, despite the water temps mentioned above. Yellow SL #32 Link to comment Share on other sites More sharing options...
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