cheekymonkey Posted July 25, 2008 Share Posted July 25, 2008 My temperature gauges are annoying me, as they seem to be next to useless for monitoring anything: 1. EGT (probe mounted in ex. manifold) This seems to work OK for normal driving, but as soon as I'm driving in a spirited manner, it peaks at 990 degrees and stays there for some time, even if I come off the throttle and start to idle, it will take 1-2 mins for it to come back down to sensible figures. This can't be right, can it!? 2. Oil (Sensor in sump plug) Perhaps I made a bad choice with the sensor position, but I don't think I'm getting a "live" picture of my oil temp. Will the sump plug be in a good enough position for oil flow? What I see is that I get to about 100 degrees after a spirited drive, but it takes a long time for it to come back down again. 3. Water (sensor in top hard pipe "hose") Reads 10-15 degrees higher than my Apexi Power FC which is using the stock sensor. Where's the stock sensor and would that explain the difference in temp I am seeing? Any hints from the tech guys please? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 25, 2008 Share Posted July 25, 2008 I would be inclined to say that they are just not very accurate gauge's sorry! the EGT is definitely suspect, get yourself one of the Redline temp gauges with four thermocouples if you want accuracy;) Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 25, 2008 Share Posted July 25, 2008 What kind of gauges are they? Quote Link to comment Share on other sites More sharing options...
cheekymonkey Posted July 25, 2008 Author Share Posted July 25, 2008 PLX devices all in one display with AFR/EGT and fluid temp modules. Quote Link to comment Share on other sites More sharing options...
Kite Posted August 7, 2008 Share Posted August 7, 2008 (edited) What readings do you get on the water temp on normal driving and what about on spirited driving? I´m only asking as I installed a water temp gauge (sensor is located on the upper radiator hard pipe) and it´s reading pretty high values. Normally it´s about 90-92c and on spirited driving it can reach nearly 100c Edited August 7, 2008 by Kite (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted August 7, 2008 Share Posted August 7, 2008 It sounds like either your gauges are no good, or the sensors are incorrectly mounted/fitted. The EGT should be fast to react , so that one is very suspect right away. Edit - just realised this was an old thread, sorry, not sure why it was bumped. Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 7, 2008 Share Posted August 7, 2008 1. EGT (probe mounted in ex. manifold) If you back-off the throttle entirely whilst slowing, NO fuel will go into the engine, so no internal cooling will be taking place. At the end of a lap at the 'Ring, where you could be crossing the finish line at 140mph plus but then have 1/3~1/2 mile off the throttle to loose that speed before leaving the track, I was putting the car into neutral and blipping the trottle, to both get fuel into the engine for cooling, and to MOVE the gas through the exhaust system instead of having super hot just been thrashing it exhaust gas sat there doing nothing,- well certainly nothing benficial for the car! 2. Oil (Sensor in sump plug) There is a lot of engine to cool down - i.e. a lot of latent heat stored up in it after a spirited drive - it will take a fair while for the oil to cool, especially if you're got the bonnet shut and/or no airflow through the engine bay (e.g. static) 3. Water (sensor in top hard pipe "hose") pass on that one Quote Link to comment Share on other sites More sharing options...
cheekymonkey Posted August 8, 2008 Author Share Posted August 8, 2008 If you back-off the throttle entirely whilst slowing, NO fuel will go into the engine, so no internal cooling will be taking place. At the end of a lap at the 'Ring, where you could be crossing the finish line at 140mph plus but then have 1/3~1/2 mile off the throttle to loose that speed before leaving the track, I was putting the car into neutral and blipping the trottle, to both get fuel into the engine for cooling, and to MOVE the gas through the exhaust system instead of having super hot just been thrashing it exhaust gas sat there doing nothing,- well certainly nothing benficial for the car! The pistons will still be acting as big air pumps, pumping cool-ish air through the exhaust system though surely? I'd have thought this would cool things down quite effectively... but I'm not an expert Quote Link to comment Share on other sites More sharing options...
b_have Posted August 8, 2008 Share Posted August 8, 2008 The pistons will still be acting as big air pumps, pumping cool-ish air through the exhaust system though surely? I'd have thought this would cool things down quite effectively... but I'm not an expert Not with the throttle closed (unless you have a huge leak Quote Link to comment Share on other sites More sharing options...
cheekymonkey Posted August 8, 2008 Author Share Posted August 8, 2008 Not with the throttle closed (unless you have a huge leak Now I feel even more stupider Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 8, 2008 Share Posted August 8, 2008 The pistons will still be acting as big air pumps, pumping cool-ish air through the exhaust system though surely? I'd have thought this would cool things down quite effectively... but I'm not an expert AIUI, it might cool to a degree but certainly not as much as chucking fuel in there to help AND you'll get further cooling capcity by blipping the throttle to increase the revs (and thus the gas flow through the cylinders and the exhaust.) A gust is better than a breeze, in simple terms. That's my not-that-technical personal view on the matter and I could well be wrong. *sits back and waits to be told he's wrong* Quote Link to comment Share on other sites More sharing options...
paul mac Posted August 8, 2008 Share Posted August 8, 2008 i would check what type of thermocouple and its connections you have in the egt as that is definately amiss, if you do not have a fast acting type all you are seeing is an event that happened sometime in the past which is completely useless Quote Link to comment Share on other sites More sharing options...
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