How do you know
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Road Master
Joined: Jul 2008
Posts: 795
Likes: 1
How do you know
2009 Electra Glide Classic
I have a stock engine with no changes to air flow. Just put on a set of 4.5 pro muffler slip on's from Fuel Moto. How can you tell if you need to tune the engine or just leave it alone?
Tech's say if you don't change air intake everything should be good.
Also, it depends on the engine itself. Some make the adjustments it needs and some don't.
I just don't want to damage the engine. Again, is there a tell tell sign that might question the engine's ability to compensate for the change in less back pressure?
Thanks for your help!
Paul
I have a stock engine with no changes to air flow. Just put on a set of 4.5 pro muffler slip on's from Fuel Moto. How can you tell if you need to tune the engine or just leave it alone?
Tech's say if you don't change air intake everything should be good.
Also, it depends on the engine itself. Some make the adjustments it needs and some don't.
I just don't want to damage the engine. Again, is there a tell tell sign that might question the engine's ability to compensate for the change in less back pressure?
Thanks for your help!
Paul
Last edited by hyperfocal; Apr 3, 2013 at 08:57 AM.
Ultimate HDF Member
Joined: Feb 2010
Posts: 8,039
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From: Jayhawk Country
The best way is to look at the plugs. If they are white and chalky the bike is running lean. Your ECM should compensate just fine for the slip on's. If you add an air kit then you will need to get a tuner.
Outstanding HDF Member
Joined: Jun 2012
Posts: 2,248
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From: Atlanta, Georgia
That method is pretty much non credible anymore due to the advancement of fuel injection and better fuels, machining, etc. What the tech said was correct. Exhaust change wont affect af ratio. It will just change backpressure which has an effect on the powerband. Tuner is not needed for slip ons. But tuner is definitely worth its price in gold. That was the first thing I did to my bike.
Thread Starter
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Road Master
Joined: Jul 2008
Posts: 795
Likes: 1
That method is pretty much non credible anymore due to the advancement of fuel injection and better fuels, machining, etc. What the tech said was correct. Exhaust change wont affect af ratio. It will just change backpressure which has an effect on the powerband. Tuner is not needed for slip ons. But tuner is definitely worth its price in gold. That was the first thing I did to my bike.
I am sure I will be doing a tune real soon.
Thanks for input!!
Paul
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