Why would u have a exhaust temp gauge, other than to show the actual temp of the exhaust.

Cheers.

 

Is this like a philosophy question?

Why do you have a clock, but to tell the time

Discuss in no less than 5,000 words.

Trout

 

Why would you want to know the temp of your exhaust?

 

Michelle

Trout said no less than 5000 words.

Are the rest of the words going to end up in the Muppet forum where this thread appears to be heading?

Duncan

PS Telling the time has no purpose if you have no idea what to do with knowledge. Perhaps that is why MY01 owners take out their clock to fit extra gauges.

 

Doesn't the exhaust get hotter if the engine is running on the lean side ????

 

By measuring the temperature of the exhaust you can tell the Air/Fuel ratio.

i.e. whether the car is running rich or lean.

This is particularly important if you're running high boost and don't want to blow up your engine.

 

Indeed, there will be a temp beyond which you will damage the engine, but that temp is different on different cars depending on the robustness of the engine. I'm sure there'll be someone here who'll know. So, it gives you the chance to back off before going bang - and like said, most useful when tuned up running big boost

 

Mook is right.

EGT is used to monitor engines during development and to detect problems in use. Typically, EGTs below 1000 C are OK, but people often set themselves a lower limt than this (I would not be happy over 900 C for a road engines). When doing engine development, if you get higher temperatures then you can choose to add more fuel to cool it down, even if this means that the negine is running richer than is required to get the most power. A by-product is that a rapid increase in EGT often will show up another problem such as injector or fuel pump problems causing the engine to lean out. If this happens, back of quickly to avoid damage!

Duncan

 

Cheers for all your answers people.

 

The EGT is indeed a health indicator.

I believe that maximum recommended EGT for a Scoob is 955 deg C. This is for a sender located in the uppipe, i.e. before the turbo.

The other common location is to locate it in the downpipe and you will see temps of 50-75 deg C lower with the sender in this location.

If the sender is located next to the lambda sensor you can calibrate the lambda output based on EGT (the output voltage goes down as the sender gets hotter - implying that the car is running lean even tho' it is not - this would encourage you, incorrectly to put too much fuel in).

The other output you can get from the EGTs is to assess the impact of advance. At cruise you can help optimise the advance based on EGTs - the more advance the hotter the car can get. Equally at high boost the reverse happens. The less advance you have the hotter the EGT gets are fuel is burning as it leaves the cylinder - not a good thing as you melt your exhaust valves.

OK, not quite five thousand words - but hey...

Trout