Calling all exhaust experts
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Tourer
Joined: Sep 2010
Posts: 423
Likes: 1
From: London, UK
Calling all exhaust experts
Hi there
So bought my first 2010 fatbob yesterday and I've got a question about the exhausts
It has stock pipes and stock air filter, as I see it from research if I only put on slip ons I shouldn't need a high air flow filter (correct me if I'm wrong)
I have a set of Vance and hines slip ons left over from my sportster in the garage but the outer diameter is 2.5", all fatbob Vance and hines slip ons are 3" diameter
Will the smaller diameter hurt the bike? I thinking smaller diameter creates higher back pressure which in turn could hurt the engine
Any info would be great as I did a search and came up blank
Cheer
John
So bought my first 2010 fatbob yesterday and I've got a question about the exhausts
It has stock pipes and stock air filter, as I see it from research if I only put on slip ons I shouldn't need a high air flow filter (correct me if I'm wrong)
I have a set of Vance and hines slip ons left over from my sportster in the garage but the outer diameter is 2.5", all fatbob Vance and hines slip ons are 3" diameter
Will the smaller diameter hurt the bike? I thinking smaller diameter creates higher back pressure which in turn could hurt the engine
Any info would be great as I did a search and came up blank
Cheer
John
Cruiser
Joined: Nov 2014
Posts: 108
Likes: 1
From: Astoria, OR
John,
Tons of development, science and testing go in to exhaust systems. Reducing the diameter will defiantly change the exhaust characteristics. Smaller diameter will mean more back pressure. Will it 'hurt' the engine? With EFI I don't believe so. Personally, since you just got the bike (GREAT boxing day present!) why not put some miles on it before you start changing things?
Enjoy and post a few pics of it...
Ride safe... cheers mate!
David
Tons of development, science and testing go in to exhaust systems. Reducing the diameter will defiantly change the exhaust characteristics. Smaller diameter will mean more back pressure. Will it 'hurt' the engine? With EFI I don't believe so. Personally, since you just got the bike (GREAT boxing day present!) why not put some miles on it before you start changing things?
Enjoy and post a few pics of it...
Ride safe... cheers mate!
David
Road Master
Joined: Nov 2010
Posts: 1,115
Likes: 69
From: Bay Area, NorCal
Congrats on your 'new' FB - it's a great bike! I believe going to smaller diameter exhaust increases low RPM torque but decreases upper RPM horsepower, so you'll have to be comfortable with the corresponding power band. Secondly, not sure how you're going to 'adapt' the Sportster muffs to the FB as the mount/support brackets are not similar.
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Thread Starter
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Tourer
Joined: Sep 2010
Posts: 423
Likes: 1
From: London, UK
Cheers for the info guys,
It's the fact there is a whole science behind it all that scares me, wasn't sure if the on board brain would compensate for it as I have read they do after about 50 miles with slip ons,
Put some miles on it before I mod it!!!!!! I can't do that, I love modding!!!!
The mounting bracket is nothing, I could mod something up
I took this
And turned it into this
It's the fact there is a whole science behind it all that scares me, wasn't sure if the on board brain would compensate for it as I have read they do after about 50 miles with slip ons,
Put some miles on it before I mod it!!!!!! I can't do that, I love modding!!!!
The mounting bracket is nothing, I could mod something up
I took this
And turned it into this
Last edited by ironhide_uk; Dec 25, 2014 at 12:55 PM.
Ultimate HDF Member
Joined: Feb 2009
Posts: 5,132
Likes: 228
From: Garland, TX
I don't think that going from the stock exhaust to a 2.5 inch aftermarket exhaust will hurt the bike since you will be going from the restrictive stock exhaust to a free flowing aftermarket exhaust.
Thread Starter
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Tourer
Joined: Sep 2010
Posts: 423
Likes: 1
From: London, UK
Do you know I never thought of that, a stock baffle blocks a lot more air flow so it should have less even with a 2.5" baffle,
That's why I love these forums
Couldn't see the wood through the trees kind of thing
That's why I love these forums
Couldn't see the wood through the trees kind of thing
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