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Old 03-10-2015, 05:58 AM   #1
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Default VE, spark and EGT I think I got it...

Hey,

I started notice that my EGT while cruising is alarmingly high.

I could get up to 950C/1750F+, at first I thought the EGT is off (it does have a bad ground and the needle jumps around sometimes)

One drive when I was cruising @ 100kph/60mph~ I saw the EGT is very high, for every little gas pedal moment the EGT would raise even more...

It was dark, I pulled over and opened the hood, the exhaust manifold and the turbo turbine were glowing red like I never saw it !

Investigation begins...

Many reading days later, conclusions:

- Higher BTDC degree = Less EGT = Less power
- AFR lower or higher then 14.7 = less EGT

My ignition map when EGT was too high:


The marked area is my cruise cells.

I added spark to the cruise arae like so:


The EGT dropped by as much as 300C/570F~ !!
Of course the power in the area dropped too.

I'm ultra happy with my little win

Now I need to find the right balance between EGT and powa.
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VE, spark and EGT I think I got it...-dany-benupto100kpa.png   VE, spark and EGT I think I got it...-dany.png  
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Old 03-10-2015, 07:15 AM   #2
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That's a fuel economy and emissions loss probably also.
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Old 03-10-2015, 07:25 AM   #3
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What will be an acceptable EGT for cruise considering a good power/fuel economy and emissions ?

Thanks

Last edited by elior77; 03-10-2015 at 07:47 AM.
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Old 03-10-2015, 12:32 PM   #4
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My cruise kpas are usually around 35-50 kpa.

Sounds like you either have a heavy foot or ? ? ? Vacuum leak?
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