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Formula for moving AFR 1 point

Old 09-15-2005, 12:16 AM
  #1  
0.5 BAR
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Default Formula for moving AFR 1 point

I know its 8.6% for 450s, but what formula gets you that percentage?

Wanting to know for 550cc injectors. In uberdata 1.7 if that matters.

Thanks
JFoster is offline  
Old 09-15-2005, 03:45 PM
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Default Re: Formula for moving AFR 1 point

A percentage is a percentage...take whatever fuel value you want to change and do the ~8% thing no matter which injectors you are using.
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Old 09-16-2005, 12:11 PM
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Default Re: Formula for moving AFR 1 point

It's not '8.6 for 450s' or ~8% for one point. :P

Depending on what point you're moving, it's all different..

Look at it like this.. from 1 to 2 is 50%.. from 2 to 3 is 33%.. 3 to 4 is 25%, they are all 'one point' but the amoutn is different.. Get my drift?

So if you're going 10 to 11.. it's 9%.. 11 to 12 is 8.3%.. 12 to 13 is 7.7%.. 13 to 14 is 7.1% 14 to 15 is 6.6%..

Bottom line.. there is no 'blanket' percent to move on AFR point. Also, Chris is right about the injector size. It doesn't matter. A percentage is a percentage. 240s.. 450s.. 1600s.. its all the same.
TurboEF9 is offline  
Old 09-17-2005, 01:22 AM
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Default Re: Formula for moving AFR 1 point

yup i misdirected you a bit on all this.

for whatever reason I had it stuck into my head that the little equations for figuring out what kind of % adjustments to make also used injector size up in there.

woopsie....heh.
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Old 09-17-2005, 09:14 PM
  #5  
0.5 BAR
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Default Re: Formula for moving AFR 1 point

Originally Posted by ****
yup i misdirected you a bit on all this.

for whatever reason I had it stuck into my head that the little equations for figuring out what kind of % adjustments to make also used injector size up in there.

woopsie....heh.
Its alright. I read that on here somewhere too, so its not just you....

Sorry guys, I am about to try to tune my LS-T myself with 0 experience .... so I am kinda nervous .... just trying to gather as much useful info as I can before I start.
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