glasgow Posted July 12, 2012 Share Posted July 12, 2012 When cruising and when driving the seven "normally", the temp gauge reads 85-90 degree. With harsh acceleration and high rpm (still at the same speed of 60-70mph), I find the temp goes down to 70 degree. I thought the higher the rpm the higher the temp provided it is the same speed..... Am I missing something here?... Ahmed Link to comment Share on other sites More sharing options...
geko Posted July 12, 2012 Share Posted July 12, 2012 Hi, don´t worry. The coolant pump is driven by the engine. High engine revs = high pump revs = high flow of coolant = lower coolant temperatures. Edited by - geko on 12 Jul 2012 20:26:41 Link to comment Share on other sites More sharing options...
Mr Locust Posted July 12, 2012 Share Posted July 12, 2012 Does it drop and stay down if you sustain the high engine load/speed eg up a big hill? Link to comment Share on other sites More sharing options...
glasgow Posted July 13, 2012 Author Share Posted July 13, 2012 Does it drop and stay down if you sustain the high engine load/speed eg up a big hill? Good question... haven't done a long blat for a while so can't answer this question.... May I know what is the significance if temp stays down or goes back up please? Also, should I consider prrt please? A Link to comment Share on other sites More sharing options...
Mr Locust Posted July 13, 2012 Share Posted July 13, 2012 The question is really to determine if the thermostat is responsive and regulating the coolant temperature properly. You are making a step change to engine speed, load (heat generation), coolant flow and air flow through the cooler - all at the same time. If the high load condition is maintained the temperature should stabilise back to normal provided the radiator is of adequate performance and thermostat isn't dead. I slightly modified the engine coolant circuit on my car but didn't go PRRT, details were submitted as an article for inclusion in LF a while back. Link to comment Share on other sites More sharing options...
glasgow Posted July 13, 2012 Author Share Posted July 13, 2012 The only change i made to my thermostat was drilling a hole in it and that was last year. I only noticed the temp gauge acting like this in the last couple of months.... Link to comment Share on other sites More sharing options...
Mr Locust Posted July 13, 2012 Share Posted July 13, 2012 I only noticed the temp gauge acting like this in the last couple of months.... Does that mean it always did it and you never noticed or you always watched and it never did it before Link to comment Share on other sites More sharing options...
glasgow Posted July 13, 2012 Author Share Posted July 13, 2012 sorry, it's my English .... meant to say I always watched and it never did it before ... Link to comment Share on other sites More sharing options...
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