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Old 08-05-2007, 03:48 AM   #1
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Default what are the values in the fuel table?

hey, so I'm used to standalones simply displaying pulse width in their fuel tables and then adjusting accordingly. However, w/ the megasquirt it is a percentage. Obviously a higher value is more fuel and a lesser value is less fuel. But what exactly is that percentage and how does it exceed 100%? Seems a little confusing.

thanks
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Old 08-05-2007, 04:26 AM   #2
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Have a read of the MegaManual. It's all in there.
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Old 08-05-2007, 12:52 PM   #3
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Quote:
Originally Posted by Aussie Driver View Post
Have a read of the MegaManual. It's all in there.
I did...I couldn't find it. Do you know what it represents? thanks
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Old 08-05-2007, 04:03 PM   #4
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volumetric efficiency... it's essentially what percentage of cylinder filling occurs at a given load/rpm. (how efficient is the engine at getting the A/F into the cylinders at that load/rpm point). The ECU then does the math to calculate PW.

It's the reason you don't need 15 different correction tables like you do with an ECU that lets you put in a static PW at a given RPM. By tuning for the engines VE and letting it adjust based on IAT/CLT/etc using proven algorithms only minor corrections are needed for special circumstances.


http://www.megamanual.com/v22manual/mtune.htm#ve
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Old 08-05-2007, 05:25 PM   #5
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Quote:
Originally Posted by FoundSoul View Post
volumetric efficiency... it's essentially what percentage of cylinder filling occurs at a given load/rpm. (how efficient is the engine at getting the A/F into the cylinders at that load/rpm point). The ECU then does the math to calculate PW.

It's the reason you don't need 15 different correction tables like you do with an ECU that lets you put in a static PW at a given RPM. By tuning for the engines VE and letting it adjust based on IAT/CLT/etc using proven algorithms only minor corrections are needed for special circumstances.


http://www.megamanual.com/v22manual/mtune.htm#ve
thanks a lot Jerry! that's exactly what I needed to know!
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