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Old 02-06-2008, 02:58 PM   #1
BoostUnderPressure03
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Default EGT Readings Accurate?

I will be installing my wideband here within the next few days and would like to get some tuning underway. I do not have the funds right now for an EGT gauge and was wondering how accurate the readings are with just data logging. If they aren't I won't mess with leaning the car out further without an EGT setup.
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Old 02-06-2008, 05:45 PM   #2
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If you buy an LC-1 it will work with Enginuity
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Old 02-06-2008, 06:01 PM   #3
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Knowing your EGT is pretty worthless because an elevated EGT can be caused by so many different things, most of which aren't harmful (e.g. higher engine speed, retarded spark advance).
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Old 02-06-2008, 07:21 PM   #4
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It may be accurate, but it is too far away from the heads anyways to matter.
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Old 02-06-2008, 07:50 PM   #5
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Quote:
Originally Posted by Infamous1 View Post
It may be accurate, but it is too far away from the heads anyways to matter.
And where exactly do you think all the heat goes traveling over 3 feet of wrapped header?

I can tell you this much....i can touch my header wrap after driving.

Tell you what....lets get 4 ft of 2.5" pipe and i'll stand on one end with an Acetylene torch and you put your hand over the other end. We'll see how much heat dissipates over 4 feet of wrapped pipe.

Do you have any data that backs up your statement? Data that shows the temp dropping dramatically at various intervals on its way to the EGT?
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Old 02-06-2008, 08:30 PM   #6
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Quote:
Originally Posted by Phatron View Post
And where exactly do you think all the heat goes traveling over 3 feet of wrapped header?

I can tell you this much....i can touch my header wrap after driving.

Tell you what....lets get 4 ft of 2.5" pipe and i'll stand on one end with an Acetylene torch and you put your hand over the other end. We'll see how much heat dissipates over 4 feet of wrapped pipe.
another example... hold your torch to the pipe and let it blow through for 30 minutes. and then just let raw gas through without igniting it. take a guess what your temp would be at the other end 5 or 10 minutes later... I can tell you it would be ALOT higher then the gas going in. (aka the exhaust gas)


you can't forget about the 3 feet of metal to absorb and release heat. your readings are going to be DRASTICALLY slower to respond because of all the metal to absorb heat, and then also will drop much slower then what is actually happening due to all the piping releasing heat. EGT isn't exactly a fast responding data point anyway, but when you add in a fairly large delay to it due to heat soak, it really doesn't help you much beyond steady state cruise EGT.
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Old 02-06-2008, 10:29 PM   #7
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Quote:
Originally Posted by rkramer View Post
you can't forget about the 3 feet of metal to absorb and release heat.
and my point by saying that i can touch my header wrap after driving was that there must not be a significant amount of heat transfer if the stock EGT is reading 1700*F and i can touch the header wrap....

i'd like to see data from a wrx with the stock EGT and an aftermarket one closer to the heads. Arguing over something with theories is pointless....i just want data.


http://forums.nasioc.com/forums/show....php?t=1301980

http://forums.nasioc.com/forums/show...&highlight=EGT

Last edited by Phatron; 02-06-2008 at 10:37 PM.
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Old 02-06-2008, 11:06 PM   #8
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Quote:
Originally Posted by Phatron View Post
and my point by saying that i can touch my header wrap after driving was that there must not be a significant amount of heat transfer if the stock EGT is reading 1700*F and i can touch the header wrap....

your header wrap is doing what it is supposed to, acting like a very good insulator and keeping everything INSIDE the wrap hot. (which includes the piping as well as the gas itself)

anyway, see example above... yes your EGT's will be very close to what would be measured in a better spot, nobody is disputing that. But there is also no argument in saying that it will take longer to measure EGT's the further you are from the source. The pipe helps moderate temperatures.
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Old 02-07-2008, 01:53 AM   #9
BoostUnderPressure03
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Jeese fellas no need to get in an argument. I realize there are different opinions so I appreciate your input. But I guess my answer is that i need to be careful because it is inaccurate?
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Old 02-07-2008, 02:13 AM   #10
Phatron
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go read through the links i posted, seems to be some good info there...
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