VE, spark and EGT I think I got it...
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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:
![](https://www.miataturbo.net/attachments/megasquirt-18/135007d1425977615-ve-spark-egt-i-think-i-got-dany.png)
The marked area is my cruise cells.
I added spark to the cruise arae like so:
![](https://www.miataturbo.net/attachments/megasquirt-18/135006d1425977637-ve-spark-egt-i-think-i-got-dany-benupto100kpa.png)
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![](https://www.miataturbo.net/images/smilies/smile.gif)
Now I need to find the right balance between EGT and powa.
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:
![](https://www.miataturbo.net/attachments/megasquirt-18/135007d1425977615-ve-spark-egt-i-think-i-got-dany.png)
The marked area is my cruise cells.
I added spark to the cruise arae like so:
![](https://www.miataturbo.net/attachments/megasquirt-18/135006d1425977637-ve-spark-egt-i-think-i-got-dany-benupto100kpa.png)
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
![](https://www.miataturbo.net/images/smilies/smile.gif)
Now I need to find the right balance between EGT and powa.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM