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Old 10-12-2016, 05:29 AM   #1 (permalink)
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Default need advice on target A/F in crome

I've been messing around with some different target AF in Crome and wanted some opinions.

D16Z6 - stock
Intake and exhaust
eg hatch
p28 w/ crome dealer

The first pic is what I have been running but I was thinking of switching to the second table with 14.7 up to column 5 and then adding fuel.

I was also wanting to know how do we determine what the difference should be in target AF ratio between Columns. Is there an equation?

Any help would be appreciated.
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Old 10-12-2016, 06:22 AM   #2 (permalink)
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Since the car is NA you can keep the first map with more 14.7s

High loads should be in the 13s.
which 5in hg is about the cross over.

"how do we determine what the difference should be in target AF ratio between Columns"

Not sure what you mean by that.
When you tune a car your suppose to know what amount of fuel it needs.
Knowing this comes by alot of things. you want to give the car enough fuel to run. Not to much that it loses power.
Not to less that it runs hot and blows up.
Different amount of loads needs different amount of fuel as it burns at different rate. Do some searching on how motors work.


Now if your talking about going from one AFR to another AFR.
I have found this long time ago, dont know the forum.

Quote:
Advanced Tactics:
This one was posted by artieman:


little lesson for you guys and gals...if you have a fuel ratio of 10.8:1 and want 12.5:1 whats the percent of adjustment...well the trick for this is have over want....you have 10.8:1 and want 12.5:1....so take 10.8 and divide it by 12.5...gives you 0.864....so take the fuel value in that cell...lets say its a value of 285 in the cell....take 285 and times it by 0.864 and thats your corrected value....can work for any value in the cell doesnt matter if its a value or time in ms

cell value of 285 give you 10.8:1 on a/f for that cell and you want 12.5:1.....take 285x0.864 and youll get 246.24 (just round it 246) and youll be about dead on for 12.5:1

some tuning systems also do it by a correction factor...where a value of 1 means no change...so if you have a value of 1 in that fuel cell and get 10.8:1 a/f ratio put 0.864 (or round it to 0. and it should put you at your target of 12.5:1

other systems do it by ms or milliseconds...time based...so if 11ms gives you 10.8 then take 11 and times it by 0.864 which is 9.504 or about 9.5ms to get 12.5:1

have/want ...easy to remember
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Old 10-12-2016, 02:36 PM   #3 (permalink)
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That kind of answers my question.

I got alot of conflicting info on when to change the target AF in the table. Some said keep it 14.7 until the 5th column some said keep 14.7 until around the 7th column.

the engine in NA for now but will be turbo as soon as I learn how to adjust the tuning.

As for the second question is was more of what's a safe change from column to column.
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Old 10-16-2016, 04:58 PM   #4 (permalink)
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13.5:1 is fun at all times.


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