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Always remember it's stating the ratio of Air to Fuel. Hence Air / Fuel Ratio = AFR.
So, at idle and while cruising down the road, your car will aim for (from the factory) about 14.7:1 AFR.
Since you're always talking about one part fuel, that means that you're getting 14.7 times more air than you are fuel.
This is all fine and well for cruising down the road but in boost, the car needs more fuel. Now, the moment it gets boost it doesn't instantly need more but it will need to ramp up to about 11.7:1 AFR. If you go back to what I was saying, that is much less air to fuel in the mix, making it it a much richer combustion.
Low 12s aren't bad in boost but >12.3 (IMO, Others will get out of the throttle sooner, faster) and you need to get out of the throttle and fix the tune. Tuning often isn't a one man operation.
Crusing and daily driving is a much more lax endeavor, AFR's bounce (Bounce meaning it'll go above 14.7, then below, then above maybe for a while then below for a while... largely variable, sometimes very very rhythmic) -a lot- and there is much less to do in the tuning aspect. Depending on how it's all setup there may not even be tuning to do.
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?
Last edited by Jeeves; 06-25-2009 at 03:20 AM.
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