EGT and Boost Relationship

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Jul 17, 2003 | 09:32 PM

BuckBoardDriver

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From: Houston, Texas

EGT and Boost Relationship

Now that I have guages, I am starting to learn ??? a little about how the CTD works. On my first guaged pull, I noticed that as it shifts into OD, the EGT goes right up the scale to around 1100 and boost goes right down. As the engine continues to spool up, the boost comes up and the EGT goes down. I presume from this that as boost comes up, the engine is getting more efficient so the EGT comes down. Right ?? If someone can explain the theory here I would certainly appreciate it.

Jul 17, 2003 | 10:02 PM

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Re:EGT and Boost Relationship

Lotsa fuel (smoke), low boost = high EGT MORE PSI boost = more power, less smoke, and lower EGT.... Idealy, you might see a puff or small trail of smoke immediately at takeoff, but it SHOULD diminish to none or a slight haze at full bore under load for best efficiency and power - at that point, you should be at around 1200 degrees EGT - or at least under 1300 or so max... More boost LOWERS EGT - too much fuel or not enough boost - or both - increase smoke and EGT...

Jul 18, 2003 | 05:34 PM

BuckBoardDriver

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Re:EGT and Boost Relationship

Understand about lotsa fuel and smoke at low rpm. Seems like the smoke should be green as it is just unburned fuel going out (read money here).

But does that mean that the engine leans out as the boost comes up and it burns less fuel at higher boost or is it just doing a better job of burning lotsa fuel?

Jul 18, 2003 | 05:49 PM

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Re:EGT and Boost Relationship

[quote author=BuckBoardDriver link=board=4;threadid=17223;start=#161556 date=1058567664] Understand about lotsa fuel and smoke at low rpm. Seems like the smoke should be green as it is just unburned fuel going out (read money here).

But does that mean that the engine leans out as the boost comes up and it burns less fuel at higher boost or is it just doing a better job of burning lotsa fuel? [/quote] Same amount of fuel - just getting it all turned into POWER instead of smoke...