Air fuel ratio tuning math question

[05plsrt4]

The question is:

Lets say at a certain throttle position I am running very rich and want to remove X amount of fuel from that area using the throttle correction map. How do you go about doing the math to figure that out?

As an example. At 31% throttle i'm running a 10.5:1 AFR's all the time at this throttle position. I want it at 12.0:1. How do you figure out the math to get it close to where you want it to be?

[JANNETTYRACING]

Quote: Originally Posted by 05plsrt4

The question is:

Lets say at a certain throttle position I am running very rich and want to remove X amount of fuel from that area using the throttle correction map. How do you go about doing the math to figure that out?

As an example. At 31% throttle i'm running a 10.5:1 AFR's all the time at this throttle position. I want it at 12.0:1. How do you figure out the math to get it close to where you want it to be?

Percentage, Remove 14% fuel

[05plsrt4]

I mean how did you come up with the 14%

[never2muchboost]

the difference between 10.5 and 12.0 is 14 %

[05plsrt4]

I see. I'm brutal with math. I was tryin to do a percentage but just couldnt figure out how to get the correct percentage to start with

[never2muchboost]

well you can either use a calculator and take the number that have and multiply it by a percentage and get your number or here is an even easier way

go into your target air fuel map under o2 feedback and make a cell the number you have. then hit m for menu and e for percent change and starting at 100% add or subtract percentage. for example make a cell 12.0 and hit m,e and 86 enter (100% - 14% = 86)it will change the box to 10.5.same goes the other way make it 10.5 then m,e 114 and enter and it will add 14% to get 12.0

[lilmike0450]

holy shit....