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EFI Sportster Motorcycle Talk (2007 and up) For 2007 and above Sportsters

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  #1  
Old 5th January 2009
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Default Foolin' your O2 Sensors

Factory Air Fuel Ratio is set at 14.7:1, thanks to the EPA. I would like my bike to run a little richer, but don't wanna drop big bucks for a fuel management system. Was looking into Xieds and thinking about going that way , but then I noticed a DIY page on Nightrider web site where you could fool your O2 sensors into the 14.2:1 range with less than $10 worth of parts from a electronics store. Anyone tried to make your own Power Divider? Did it work? Thanks
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  #2  
Old 5th January 2009
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A mate did this for another bike and it worked fine. He's a bit ham-fisted and made a mess of the O2 lead by cutting into it and soldering a resistor in place so he ended up buying a Xied-type lead anyway.

So, yes, it does work but you might find buying a lead more convenient.

Fox
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Old 5th January 2009
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It's not the resistors that are the trouble...it's finding the connectors that seems to be the problem.
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Old 5th January 2009
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Just spend the $69.95 and buy his 02 IEDs. It's a lot easier than trying to build your own, and they do work.
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Old 5th January 2009
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What A/F ratio do you get with those leads?
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  #6  
Old 5th January 2009
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Quote:
Originally Posted by FrankBlack View Post
What A/F ratio do you get with those leads?
With the $69.95 ones (02 IED) you're going to get about 14.2, which is really ideal for improved performance/cooling and fuel economy.

Once I get my FXDC broken in good, I'm going to put a set on it. I can already tell she's not happy running so lean (even though the 09s are running a little richer than 14.7 from the factory).
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Old 9th May 2009
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Default

I just did this mod as found on nightrider.com/biketech/hd2007HD_nbo2_volt_divide.htm. For the $5 in parts from FRY's and a little time I saved alot of $$$ and acheived the same results. I cut the wires coming frim the sensor to install the 10kohm and 20kohm resisters and put heat shrink over it all. you cant even see that it was modified...

the results for my engine is that it runs alot smoother at idle and quieter overall (lower pitch exhaust I think best describes it) with more power that seemed to be a little more responsive to throttle movement. I lost about 1-1/2 mpg and the temperature went down ~5-10 degrees

Well worth it for the $5 investment
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