Can someone please explain a little deeper about why its important to monitor your EGT? I did a search and came back w/ 5 results none of which answered this question. Thanks!

 

egt's are directly affected by a/f ratio's.. using one can tell you whether you're running lean or rich (can't remember exactly what temp is ideal, I think it's 1600-1700 not sure tho).. some use this gauge as a means of tuning with an safc/vafc.. especially in the dsm world. dunno if this is what you're looking for.

 

the more rich the mixture, equals higher EGT's right? and the leaner the mix. = lower EGT's? or is that backwards?

 

So instead of having an Air Fuel gauge an EGT gauge is one step farther. Is that correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by glowing_turbo &raquo;</TD></TR><TR><TD CLASS="quote">the more rich the mixture, equals higher EGT's right? and the leaner the mix. = lower EGT's? or is that backwards?</TD></TR></TABLE>

You are backwards on that. Hot= LEAN, COLD= RICH.


Rob

 

Okay I thought high EGT's meant two things. One you are running lean and two your timing is pretty far advanced. Both of these would lead to hotter exhaust gas temps.

 

i think i would rely more on an egt guage than an A/F guage, unless ur talkin about a wideband 02 setup........

i plan on just using an egt and an AF guage just to be safe until i can save enuf for a stand alone and dyno tuning........... (plus there is nowhere near my area that does dyno tuning unless i feel like takin a 3hr trip to NYC)

 

Too retarded timing can also lead to higher egts

 

To properly tune your car you need to monitor EGTS and a/f ratio. Once you go too lean the EGT will start reading lower, even though you are leaning out.

Best power will be aprox. 125 degrees(F) RICH of peak EGT.
Best Economy will be peak EGT.

 

I've always thought the higher the EGT the richer your mixture is..and the lower the EGT the leaner your mixture is......but in extreme cases a lean mixture can lead to a higher EGT....can anyone else leave more input...about this?

Also..other than an EGT...you could invest in a 02 wideband...pricey..but will definitely tell you if your rich or lean...

Khoi

 

The highest EGT you will see will be at stoichiometric (14.7:1 AFR) and it falls off on either side of this. Retarding the timing will also raise the EGT. So, you can really only use it to determine whether SOMETHING isn't right, you'll have to have an accurate (wideband) AFR monitor or timing logger to determine which is the cause.

 

High EGT = LEAN
Low EGT = RICH.

Used it a a simple glance when driving to indicates wether you're leaner or richer than USUAL, but not as a tuning device. If you can use it as a tuning device, great..but I would never use it. I used it to reference wether my valves are melting or not based on the temp.

stan

 

this has been mentioned before but.....

you could possibly be running completely rich or not enough timing, causing the engine to pre-ignite and also cause high egt's.

a wide band is the best way to know how rich/lean/whatever your car is running.

 

i was too lazy to read all of the post..but EGT serves as telling whether you are rich or lean. But also tells you if you've been boosting too much(this is what ive been told atleast) and also will be a great warning on any engine problems if your EGT temp suddenly changes. good way to keep your pistons from melting. EGT is a great tool but kind of pricey. But worth the investment.

 

I say..it doesn't matter if you know if its how hot or how cold it is on the EGT...just as long as its in the correct range...lol..if its out of range...then pull that beast over...period...........well..ok maybe not pull over but atleast to know something is up and to be careful LOL

Khoi