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Crome Cell value Tips

Old 02-26-2008, 12:24 AM
  #1  
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Default Crome Cell value Tips

Well i search and i didn't find anything in here so i'm going to give you guys a little tip.. i know there are some of you guys that know this. but there are plenty that don't


here are a couple equations in order to convert the numbers in each cell into injection ms that are shows in the 2d graph

Cell value X 0.01724739 = injector ms

inj ms divided by 0.01724739 = cell value (so you can go back and forth from one unit to the other)


so whats the point of this you may ask... You can use this to calculate a target A/f and suggested inj ms. here is how it work

(for people with crome free and freelog)

after you log, you could use your actual a/f to calculate how many ms you want your injector to open to get a target A/F.

lets say you got 11.32 a/f at 7000rpm and you want 12.9.... 11.32 divided by 12.9 =0.877 this is your fuel multiplier and you multiply your injector ms by this number and will get your suggested inj ms.. lets say you inj ms is 9.30ms... multiply
9.30ms * 0.877 = 8.15ms this is your new inj ms..

Crome doesn't show the exact inj ms in there scale, in order for you to see the exact timing you have to click and drag up and down the points on the 2d graph.... OR you can just divide the cell value by 0.01724739 to get your inj ms

here is what i always do.. I made a table on exel and i always print one for each car, it look some what like this:

(example for 12.9 A/f target)


LOG A/F Inj MS fuel multiplier New ms new cell value
500 13.5 7.39 x 1.046 = 7.72 / 0.01724739 = 447
1000 13.7 7.39 x 1.062 = 7.50 / 0.01724739 = 434
1203
bla bla bla

Always, Always, Always divide yout LOG A/F by your Target A/F

I only know the basics of exel but i'm sure you can make a taple that can spew out all this.. you just have to input the amount.

I hope this can help people out, it only takes me about 3 pull to get the WOT A/f where i want it on NA cars and some turbos.

Zriuz is offline  
Old 02-26-2008, 12:35 AM
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Default Re: Crome Cell value Tips

cool ---- ill have to try that out
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Old 02-26-2008, 01:10 AM
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Default Re: Crome Cell value Tips


Let me show you why all of your work is worthless and a waste of time.

( AFR / Target AFR ) = Fuel Mult

Cell Value * 0.0172 = Inj ms1

Fuel Mult * Inj ms1 = Inj ms2

Inj ms2 / 0.0172 = New Cell Value

SUMMED UP:

(AFR / Target AFR ) * ( Cell Value * 0.0172 ) / ( 0.0172 ) = New Cell Value


Waste of time since you are multiplying by 0.0172 and then dividing by 0.0172. WASTE OF TIME. It equals one.

( AFR / Target AFR ) * Cell Value = New Cell Value


Why convert when you are just going to covert back. That's like converting miles to feet, but coverting miles into lightyears first.



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Old 02-26-2008, 01:47 AM
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Default Re: Crome Cell value Tips

1.Calm down...
2.Read better...
3.if you don't want to go point by point clicking up and down in the 2d graph for you to get your actual inj ms... JUST DIVIDE YOU CELL VALUE BY 0.172 AND THAT IT....

I DIDN'T SAY (Cell value*0.0172) / (0.0172) new cell value... that is none sense

cell value /0.172= ACTUAL INJ MS... SO YOU DON'T WASTE YOUR TIME TRAYING TO FIGURE IT OUT IN YOUR 2D GRAPH THAT ALL.
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Old 02-26-2008, 12:27 PM
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Default Re: Crome Cell value Tips

Originally Posted by Zriuz
so whats the point of this you may ask... You can use this to calculate a target A/f and suggested inj ms. here is how it work

You said it right there. "Use this to calculate target AFR"

Thus, my point. You don't need to know injector opening time to calculate target AFR.



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Old 02-26-2008, 01:38 PM
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Default Re: Crome Cell value Tips

Instead of calling my attempt to help fellow members out WORTHLESS...

post your own formulas.. so the rest of the board can learn.
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Old 02-26-2008, 02:15 PM
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Default Re: Crome Cell value Tips

Originally Posted by Zriuz
Instead of calling my attempt to help fellow members out WORTHLESS...

post your own formulas.. so the rest of the board can learn.
He did just that a while back.

Oscar is offline  
Old 02-27-2008, 05:14 AM
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Default Re: Crome Cell value Tips

Originally Posted by Zriuz
post your own formulas.. so the rest of the board can learn.

AFR / Target AFR * Value = New Value

This is not mine, yours, or anyones. This is simple mathematics. It goes with tuning ANY EMS. Really, any.



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