Change "football" for round cover?
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Road Master
Joined: Jul 2010
Posts: 1,241
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Thanks for the advice. The bike has only 150 miles on it and I don't want to do a stage 1 at this early time. I bought a Harley dipstick oil thermometer and the bike was running at 250 to 275 degrees when not in stop and go city traffic. I want to get it broken in and see if there is a temp problem without any alteration of the factory settings. Scorpion07's explanation above sure makes sense but I'm concerned that the Big Book says you can put on SE slip-ons without mentioning need for ECM recalibration, BUT it clearly says you need recalibration if you change the air filter---and that looks like it means you need it if you change the air filter ONLY. I'm not much of a mechanic so I really appreciate your help.
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,741
Likes: 1,598
From: Danbury CT
Thanks for the advice. The bike has only 150 miles on it and I don't want to do a stage 1 at this early time. I bought a Harley dipstick oil thermometer and the bike was running at 250 to 275 degrees when not in stop and go city traffic. I want to get it broken in and see if there is a temp problem without any alteration of the factory settings. Scorpion07's explanation above sure makes sense but I'm concerned that the Big Book says you can put on SE slip-ons without mentioning need for ECM recalibration, BUT it clearly says you need recalibration if you change the air filter---and that looks like it means you need it if you change the air filter ONLY. I'm not much of a mechanic so I really appreciate your help.
Road Warrior
Joined: Jun 2008
Posts: 1,602
Likes: 3
From: Southeastern Michigan
Thanks for the advice. The bike has only 150 miles on it and I don't want to do a stage 1 at this early time. I bought a Harley dipstick oil thermometer and the bike was running at 250 to 275 degrees when not in stop and go city traffic. I want to get it broken in and see if there is a temp problem without any alteration of the factory settings. Scorpion07's explanation above sure makes sense but I'm concerned that the Big Book says you can put on SE slip-ons without mentioning need for ECM recalibration, BUT it clearly says you need recalibration if you change the air filter---and that looks like it means you need it if you change the air filter ONLY. I'm not much of a mechanic so I really appreciate your help.
I would think the stock mufflers are quite a bit more restrictive then the stock intake? Guy's on here have modded out their exhausts only, without having to add a fuel management system. I would think the same would be true of the A/C only?
It's possible the book says that, since most people who put the SE A/C on only do it because they already modified their exhaust?
I guess you won't know until you find someone who's done it.
Road Captain
Joined: Sep 2008
Posts: 628
Likes: 1
Simple: Your cylinder is capable of as much volume as it can take in through the intake, and push out through the exhaust. Both are limited from the factory (for various reasons) of the cylinder's potential. If you only change the efficiency of one (intake or exhaust) the other will be the limiting factor, and nothing changes. The cylinder can't pull in or push out more then the lesser will allow. No fuel adjustments are necessary.
A Stage I opens both (intake and exhaust), allowing for more air flow through the engine. In order to take advantage of that added airflow more fuel is required, otherwise a lean air/fuel ratio will occur, limiting, and in most cases decreasing, it's power potential. By adding more fuel at this point, you add more fuel burn per stroke, adding extra power capability to the unrestricted engine.
A Stage I opens both (intake and exhaust), allowing for more air flow through the engine. In order to take advantage of that added airflow more fuel is required, otherwise a lean air/fuel ratio will occur, limiting, and in most cases decreasing, it's power potential. By adding more fuel at this point, you add more fuel burn per stroke, adding extra power capability to the unrestricted engine.
I assume that aftermarket suppliers such, as Power Commander, do not suffer from the government restrictions on AFR, as they do not produce entire motorcycles.
Road Warrior
Joined: Jun 2008
Posts: 1,602
Likes: 3
From: Southeastern Michigan
It is my understanding that any remapping that comes from MOCO will always result in a 14.7:1 AFR. This is mandated by the EPA. So, if one increases the airflow and gets a factory download, it will increase the amount of fuel, but only until the increase achieves the same 14.7:1 AFR, which will still be the same ratio that is resulting in a lean condition to begin with. Just more of everything. This might result in more go but will still be too lean.
I assume that aftermarket suppliers such, as Power Commander, do not suffer from the government restrictions on AFR, as they do not produce entire motorcycles.
I assume that aftermarket suppliers such, as Power Commander, do not suffer from the government restrictions on AFR, as they do not produce entire motorcycles.
This allows the tuner to tune according to engine requirements at any given engine RPM, outside of the leaner EPA mandated ratio.
Grand HDF Member
Joined: May 2007
Posts: 3,553
Likes: 17
That is exactly what I did to my Wide Glide. I didn't want to change the air flow from stock as I'm not ready to do the rest of the performance mods.
I just wanted to get rid of the football. A forum member named Taddeoeg made the suggestion, and someone from HDForums sold me their complete Crossbones air cleaner assembly for I think $35 shipped. Here's what it looks like on my bike:
I just wanted to get rid of the football. A forum member named Taddeoeg made the suggestion, and someone from HDForums sold me their complete Crossbones air cleaner assembly for I think $35 shipped. Here's what it looks like on my bike:
Thread Starter
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Road Master
Joined: Jul 2010
Posts: 1,241
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So this is getting very interesting. Does this mean that if I upgrade at the dealer to SE air cleaner/pipes/ and remapping/ECM controller, it's still going to be running 14.7:1 lean? Does that do much for me in anything other than sound improvement? Thanks
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,741
Likes: 1,598
From: Danbury CT
That's it! Now add a fuel management device & you're good to go.
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Road Captain
Joined: Sep 2008
Posts: 628
Likes: 1
As far as I know, unless one first swaps out the stock exhaust and the A/C, then purchasing a fuel management gizmo will not do much because all the hopes and dreams in the world won't un-restrict the intake and outflow, which is needed to garner much improvement.
Tourer
Joined: Sep 2009
Posts: 479
Likes: 4
From: Nanaimo, Vancouver Island
My boyfriend has a round on his FLHX. He actually just has the cover on and left the filter exposed. Looks great.
My sporty still has the oval one on but I just bought a screaming eagle heavy breather. I am just waiting for the TTS tuner to arrive. Unfortunately I just can't change mine out straight across. Looking forward to giving my knee more clearance.
My sporty still has the oval one on but I just bought a screaming eagle heavy breather. I am just waiting for the TTS tuner to arrive. Unfortunately I just can't change mine out straight across. Looking forward to giving my knee more clearance.
Last edited by Grrrl; Aug 6, 2010 at 03:44 PM.