[Diy_efi] Base Fuel Calculations..

[Tlsalt at aol.com]

Gregory Croft wrote,

Yeah, I have a Turbo System.

What VE calc would I use then?

Are there any calcs for air temp compensation?

Hello Greg,

That formula is used to ball park pulsewidth based on the weight of the air 
in the cylinder.  With forced induction, the peak VE will be over 100% 
(static volume).  How much depends on boost pressure.  If you take an ideal 
engine (at 14 psi air pressure) and add 14 psi boost pressure, you are almost 
doubling the air weight (minus some error/efficiency factor), and you'll need 
almost twice the fuel for the same air-fuel ratio.  See where it is going ? 
Is there a user group for your ECU where you might find a sample fuel map ?

The default air temperature correction map used by Haltech adds +5 % fuel at 
0F, decreasing to 0 correction at 72 F, and then subtracts fuel gradually to 
-8% at 200F.

Paul Saltwick

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