Question about Warmup Enrichment

[99octane]

The Warmup Enrichment table shows the mixture enrichment applied during warmup, depending on engine temperature.
For what I have understood, as the engine temp rises, the enrichment should decrease as shown in the table.
However, from data recorded from my engine, the initial enrichment decreases VERY rapidly in the first seconds of engine running (no, I'm not looking to the crank up mixture enrichment by mistake), much ahead of what shown in the Warmup Enrichment table.
Why does this happens?

[strokerjlk]

Originally Posted by 99octane

The Warmup Enrichment table shows the mixture enrichment applied during warmup, depending on engine temperature.
For what I have understood, as the engine temp rises, the enrichment should decrease as shown in the table.
However, from data recorded from my engine, the initial enrichment decreases VERY rapidly in the first seconds of engine running (no, I'm not looking to the crank up mixture enrichment by mistake), much ahead of what shown in the Warmup Enrichment table.
Why does this happens?

-16c=3.1f
0 c=32. f
20 c=68
32c=89.6f
42c=107.6 f
64c=147.2f
80c=176f
96 c=204f
112c=233f
166c=320f
176c=348.8
192c=377f
the colder the engine temp is, the more the enrichment is.
so based on ambient temp this will change where you start on enrichment. so the warmer the ambient temp is the less fuel is used on enrichment.
If you are logging a warm motor then the enrichment will match the temp of the motor.
likewise you will see your idle rpm changing in the same manner.
when ambient temp is low it will idle higher for longer at start up.
this is what you will see the tach at say 1300rpm for just a short period and then start falling quickly on a warm motor or very hot days.
likewise on a very cold start up it will stay at 1300 rpm for most of the warm up period.

[murphdog]

Warmup enrichment goes away in a preset amount of time, it does not go away following the temperatures in the warmup enrichment table. My warmup enrichment is gone anywhere between 60 and 90 seconds after startup.
From one data run: I start the engine at 20°C, warmup enrichment is 1.2. 60 seconds later, warmup enrichment is at 0 and engine temp is only up to 26°C.
From another: I start the engine at 24°C, warmup enrichment is 2.2. 77 seconds later, warmup enrichment is at 0 and engine temp is only up to 34°C.
In my Race Tuner software, warmup enrichment can only be set as low as 1.0 in any temp cell. If it followed the table, it would never go to 0. What you're seeing is the way it's supposed to work.

[strokerjlk]

Originally Posted by murphdog

Warmup enrichment goes away in a preset amount of time, it does not go away following the temperatures in the warmup enrichment table. My warmup enrichment is gone anywhere between 60 and 90 seconds after startup.
From one data run: I start the engine at 20°C, warmup enrichment is 1.2. 60 seconds later, warmup enrichment is at 0 and engine temp is only up to 26°C.
From another: I start the engine at 24°C, warmup enrichment is 2.2. 77 seconds later, warmup enrichment is at 0 and engine temp is only up to 34°C.
In my Race Tuner software, warmup enrichment can only be set as low as 1.0 in any temp cell. If it followed the table, it would never go to 0. What you're seeing is the way it's supposed to work.

you misunderstood what I was saying.
the temp determines what % of enrichment it supplys.
not the time it supplys as you stated.
sorry I dont explane thing very well sometimes!

[murphdog]

Not disputing what you said at all! Just trying to add an explanation of why the warmup enrichment doesn't decay per the engine temperature in the table.

[strokerjlk]

Originally Posted by murphdog

Not disputing what you said at all! Just trying to add an explanation of why the warmup enrichment doesn't decay per the engine temperature in the table.

Roger

[HDWRENCH]

On hot re starts with some on the bigger builds we have to increase the fuel as that is what it wants for start up. Just a bit more info.