mellonman Posted May 7, 2008 Share Posted May 7, 2008 what is this exhaust gas ? or am i way off:search: Quote Link to comment Share on other sites More sharing options...
johnd-mkiv Posted May 7, 2008 Share Posted May 7, 2008 Exhaust Gas Temperature Quote Link to comment Share on other sites More sharing options...
simbasupra Posted May 7, 2008 Share Posted May 7, 2008 Just found this explanation of EGT gauges might help you understand them:) EGT Gauges Explained An Exhaust Gas Temperature (EGT) gauge is a great compliment to an air fuel ratio (AFR) gauge. Some folk tune cars based just on EGT and some just on AFR but combining both measurements is a much better way to tune. EGT is used for tuning and also as a warning indicator. The EGT suggests whether the AFR is relatively rich or lean. This information is most useful during wide open throttle (WOT) engine operation. At WOT, values between 850ºC (1562ºF) and 900ºC (1652ºF) are often considered ideal; temperatures below 800ºC (1472ºF) are considered too rich; temperatures above 925ºC (1697ºF) and approaching 1000ºC (1832ºF) are considered dangerously lean and can result in excessive engine detonation (knock) and possibly burnt or melted components (valves, spark plugs, pistons, rings). The placement of the EGT probe affects the measurement (the further the probe is from the head exhaust port the cooler the temperature can be) as does the amount of ignition timing advance (more advance can mean cooler temperatures). To get useful temperatures, the probe must be installed in the exhaust manifold (and if on a turbo car before the turbocharger). Most people install the probe near where the individual exhaust manifold branches have joined and the temperatures from each cylinder have combined. Of course, EGT measurements will vary from car to car and also depend on probe placement. Once you have installed a Dynotune digital EGT gauge on your particular car and used it in conjunction with an AFR gauge you will soon be able to develop an 'EGT signature' of your particular vehicle and be able to tell just whats going on with your engine based on the two gauges! Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 7, 2008 Author Share Posted May 7, 2008 thanks for that so wot happends when you decat is this sensor removed ? Quote Link to comment Share on other sites More sharing options...
mikeyb10supra Posted May 7, 2008 Share Posted May 7, 2008 thanks for that so wot happends when you decat is this sensor removed ? the sensor your on about is a cat temp sensor....totally different mate, EGT gauge does not come as stock Quote Link to comment Share on other sites More sharing options...
Class One Posted May 7, 2008 Share Posted May 7, 2008 No, that is a cat temp sensor, it measures the temperature of your catalytic convertor. When you decat it is just tied up out of harms way and doesn't effect your car at all. An EGT sensor is an aftermarket item that is only useful if it is mounted in the correct place. Or it's just another dial in your cabin for you to worry about. Quote Link to comment Share on other sites More sharing options...
simbasupra Posted May 7, 2008 Share Posted May 7, 2008 No, that is a cat temp sensor, it measures the temperature of your catalytic convertor. When you decat it is just tied up out of harms way and doesn't effect your car at all. An EGT sensor is an aftermarket item that is only useful if it is mounted in the correct place. Or it's just another dial in your cabin for you to worry about. Just out of interest do most people tie it up out the way or disconnect it? Quote Link to comment Share on other sites More sharing options...
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