Reading EGT

Bullz_EyE · 11-02-2005, 01:35 AM

I've always wondered what to look for when reading Exhaust Gas Temperature? What are you looking for? How does the data aid in tuning? Is it also an aid to look for signs of a problem?

I know it provides useful data, but I have no idea how to to interpret it. I'm curious because mostly every aftermarket turbo elbow I've looked at has a bung for an EGT gauge and I want to make use of it.

joel w · 11-02-2005, 05:57 AM

the bung for the 90 elbow might be for the O2 sensor, basically the same thing. cept the ecu gets that signal. but anyways egt gauge is nice because it lets you read the temp of the exhaust gases at the turbo, so if its on the high side , your running lean, (bad) and if its on the lower end , your running rich (good) egt gauges are nice because they react faster than say an air/fuel meter?

there is more power created when your running lean, but its not good in the long run. tends to ping (knock) and can detonate the motor. especially under higher boost..

SupraMan1784 · 11-02-2005, 01:21 PM

[QUOTE=joel williams]...your running rich (good)...[QUOTE]

i wouldnt say running rich is good...you are correct when comparing it to a lean ratio where rich is a lot better than running lean...you would want it somewehre in teh middle where teh stoichiometric ratio is most efficient

joel w · 11-02-2005, 06:49 PM

you would want it somewehre in teh middle where teh stoichiometric ratio is most efficient[/QUOTE]

stoichiometric, good job...

SupraMan1784 · 11-02-2005, 07:30 PM

thanks...i knew that word would come in handy some day

11-02-2005, 01:35 AM	#1
Bullz_EyE 3" Exhaust Join Date: Oct 2005 Location: San Diego, CA Posts: 238	Reading EGT I've always wondered what to look for when reading Exhaust Gas Temperature? What are you looking for? How does the data aid in tuning? Is it also an aid to look for signs of a problem? I know it provides useful data, but I have no idea how to to interpret it. I'm curious because mostly every aftermarket turbo elbow I've looked at has a bung for an EGT gauge and I want to make use of it.

11-02-2005, 01:21 PM	#3
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	[QUOTE=joel williams]...your running rich (good)...[QUOTE] i wouldnt say running rich is good...you are correct when comparing it to a lean ratio where rich is a lot better than running lean...you would want it somewehre in teh middle where teh stoichiometric ratio is most efficient __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

11-02-2005, 06:49 PM	#4
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	agreed you would want it somewehre in teh middle where teh stoichiometric ratio is most efficient[/QUOTE] stoichiometric, good job...

11-02-2005, 07:30 PM	#5
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	thanks...i knew that word would come in handy some day __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

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11-02-2005, 05:57 AM	#2
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	the bung for the 90 elbow might be for the O2 sensor, basically the same thing. cept the ecu gets that signal. but anyways egt gauge is nice because it lets you read the temp of the exhaust gases at the turbo, so if its on the high side , your running lean, (bad) and if its on the lower end , your running rich (good) egt gauges are nice because they react faster than say an air/fuel meter? there is more power created when your running lean, but its not good in the long run. tends to ping (knock) and can detonate the motor. especially under higher boost..