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Curious George
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3,569 Posts
Discussion Starter #1
Sorry, but search option is a BUXXXXXX. We can't find anyting about that due to 3 letters option.

In what range should be exhaust gaz temperature ? I heard some people who tune their car not so bad only with EGT gauge, so it's true or wideband is really needed ?

thank you :)
 

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the MAD scientist
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2,574 Posts
nope you need a wideband to get your AFRs dialed in. EGTs are mostly used to determie ignition timing. The proper range of EGTs depends on many factors like AFRs, compression ratio, ignition timing...
 

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Curious George
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3,569 Posts
Discussion Starter #3
Ok, I see ! It's more a gauge who tell you where is the melting point due to these factors, not precise tuning . But If your compression ratio is like 8.8:1 and ignition timing is really not agressive like y7 ecu, the last factor is air fuel ratio ? At this point if EGT is too much you have to spray more fuel into combustion chamber true ?

thank you :)
 

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Registered
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1,170 Posts
You NEED a air/fuel ratio to set the air fuel ratio.....when you know that your a/f ratio is alright in all rpm/load, you can use a egt sensor/gauge to set your ignition timing!

A/F rich= low exhaust temp
a/f lean= high exhaust temp

agressive ignition timing= low exhaust temp(complete combustion)
ignition timing set too late= high exhaust temp( flamme get out of the combustion chamber)

So, when your a/f is right, you check your egt to know if your timing is OK!
 

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If your egt are high, and you dump more fuel, it will not always lower your egt! If the egt is high because your ignition timing is set too late, and you dump more fuel, you will get MORE flamme getting out of the combustion chamber.....
 
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