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adapting a b18b map to run a b20, how much more fuel????
if i were to make a map to run a b20 using an ls map to start, how much fuel should i add back in to account for the larger displacement. this is running uberdata.basically im looking to take my tuned map, safely account for the larger displacement of the b20 and send it to a friend to get his car going. i think i remember hearing that it is about 15% more fuel, but i kinda want to get second opinions.
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Re: adapting a b18b map to run a b20, how much more fuel????
1 - (1.8/2.0) * 100 = 10%
Obviously that is a rough estimate and comes down to actually how many more Oxygen molecules get into the cylinder every cycle, but its ok to start tuning from and with a wideband of course please. |
Re: adapting a b18b map to run a b20, how much more fuel????
I couldn't have said it better myself. Math = Your Friend.
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Re: adapting a b18b map to run a b20, how much more fuel????
thanks for the replies. ill give it a try then. sorry i didnt do the math myself....
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Re: adapting a b18b map to run a b20, how much more fuel????
Hmmm, there may already be a thread somewhere, but maybe a sticky would be in order, one with all the magical formulas that you guys use to figure out the corrections etc... The formula along with a brief explanation of what it does. These type of questions seem to be popping up a lot lately. Just a thought.
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Re: adapting a b18b map to run a b20, how much more fuel????
Originally Posted by ZC4ME
...maybe a sticky would be in order, one with all the magical formulas..
Finding the percent of difference. Injectors.. ((OldInjFlow/NewInjFlow) - 1) * 100 = How much fuel you need to add/subtract to "zero out" the new injectors.. Air Fuel Ratio.. ((PhysicalAFR/TargetAFR) -1) * 100 = How much fuel you need to add/subtract to hit your target AFR.. Displacement ((OrigDisp/NewDisp) - 1) * 100 = Percent of fuel to add/subtract to compensate for displacement.. Ta-da! ..all the same formula, just applied to different situations. ;) |
Finding Points on Line (Linear Graphing)
Y = mX + b
m = (y2 - y1) / (x2 - x1) <--Slope of the line If you know the slope of the line and one point on it, you can find b. b = Y- mX Then you can find any point on that line. What's that good for you ask? Well...most widebands are linear. So are map sensors....and a lot of other Honda sensors. Y1 = 0v X1 = 0 (degrees, PSI, InHg, ect) Y2 = 5v X2 = 5 (degrees, PSI, InHg, etc) |
Re: adapting a b18b map to run a b20, how much more fuel????
Originally Posted by TurboEF9
Originally Posted by ZC4ME
...maybe a sticky would be in order, one with all the magical formulas..
Finding the percent of difference. Injectors.. ((OldInjFlow/NewInjFlow) - 1) * 100 = How much fuel you need to add/subtract to "zero out" the new injectors.. Air Fuel Ratio.. ((PhysicalAFR/TargetAFR) -1) * 100 = How much fuel you need to add/subtract to hit your target AFR.. Displacement ((OrigDisp/NewDisp) - 1) * 100 = Percent of fuel to add/subtract to compensate for displacement.. Ta-da! ..all the same formula, just applied to different situations. ;)
Originally Posted by xenocron
Y = mX + b
m = (y2 - y1) / (x2 - x1) <--Slope of the line If you know the slope of the line and one point on it, you can find b. b = Y- mX Then you can find any point on that line. What's that good for you ask? Well...most widebands are linear. So are map sensors....and a lot of other Honda sensors. Y1 = 0v X1 = 0 (degrees, PSI, InHg, ect) Y2 = 5v X2 = 5 (degrees, PSI, InHg, etc) |
Re: adapting a b18b map to run a b20, how much more fuel????
Bah...we're just showing off
O0 |
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