REQ_Fuel Calculator air fuel ratio assistance

For discussing B&G MS-I/MS-II set-up and tuning of fuel parameters (including idle valves, etc.).
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Maggott
MegaSquirt Newbie
Posts: 1
Joined: Mon Jan 19, 2009 1:05 am

REQ_Fuel Calculator air fuel ratio assistance

Post by Maggott »

Hi

This is probably a stupid question but I have searched a lot and not found the answer, even though searching this forum and the megamanual.

In the engine constants it asks for engine displacemnt, injectors, injector flow and air-fuel ratio.

My problem is I have no idea what to set my air-fuel ratio at.
Is this a calculated guess for every car ad how do I find this ratio out??!!

I am especially confused because no one else seems to have this problem!!! :cry:

Any Help would be awesome!

MS1 V3.0 029 code Megatune 2.25p3
1990 B6ZE turbo, 320cc injectors, tdo4h
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: REQ_Fuel Calculator air fuel ratio assistance

Post by Matt Cramer »

The idea behind Required Fuel is that it is the pulse width that would give you the air fuel ration shown in the box at wide open throttle if the engine had 100% volumetric efficiency. Some tuners will set this to the ratio they want to target at full throttle (usually around 12.5:1) and others set it to 14.7:1. There aren't any wrong answers as long as the engine runs well, though your map is going to look really weird if you put in a value less than 10 or more than 20.
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