Question about 2008 Harley Davidson FLHX Street Glide

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Is it ok to run rinehart slip ons without re mapping air fuel ratio

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Yes, as long as you don't change the airfilter

Posted on Aug 30, 2010

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Technically, you should be able to get away with it as long as you don't put a higher flow air cleaner than the factory one, but it's not the correct way to do it.
Pipes help to improve the "breathing" or flow of air/fuel ration through the engine. The fuel injection is set to deliver a certain air to fuel ratio, so if you improve the output, or air flowing through the engine, you should also increase the fuel to compensate for it.
A leaner engine - or one that has a higher air to fuel ratio will run hotter, can "ping" (pre-ignition) and cause damage to the cylinders and pistons.
An air cooled Harley Davidson relies even more on the fuel to air ratio to moderate temperatures than a liquid cooled engine, which has a radiator, etc to cool it.
It's simply not worth the risk to run your bike for longer than it takes to get to the shop and have it re-mapped. It will also run cooler, and make more horsepower if you put a higher flow air cleaner and have it re-mapped.
Hope this helps.

Posted on Jan 08, 2011

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Posted on Aug 31, 2010

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I hope you are speaking of the ECM, otherwise my advice may not be of any value. First if you have any modifications to the bike such as pipes & air cleaner, etc. then your issue would be magnified. The information in your "computer" as it relates to how the bike runs is called a MAP. The map defines idle speed, desired air fuel ratio (AFR), rev limit, monitors O2 sensor information, and much, much more. So if the MAP is say for a stock bike and yours has pipes, etc. then it will run poorly. I would call the dealer that replaced the part for you and ask if they downloaded the right MAP for your bike.
Without special equipment (i.e Screamin Eagle Race Tuner SERT) you cannot make changes yourself.
Please start with the call to the dealer and please post your results for us. Thanks and hope this helps.


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