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sam13 · 04-02-2010, 06:13 PM

I just got a 2010 Harley Davidson Iron sportster . I want to change the exhausts on it to short staggered Vance & Hines . but some people say i need a fuel pack to where some say no .Or i need to put Power command or some other crap . Can't i just put on the new exhausts and that's it? I know Harley Davidson wants me to buy all kinds of stuff spend that money. If any one has any info it will be really appreciated .. Thank You..

mscuddy · 04-02-2010, 06:29 PM

You have to get the ECM re-mapped to make up for the lower backpressure and scavenging that the cylinder does at lower backpressures, you have to richen it up a taste, or you run the chance of burning valves, pistons, etc. Also it will run slower and make more niose if you don't get the fuel circuit reset for the pipes. It will probably make more noise and go slower anyway, but make that loud speed-boat noise all us Harley guys covet.

sam13 · 04-03-2010, 05:39 AM

But doesn't the computer have a big enough range there, for it to adjust it self, for how lean or how rich to make it self . And that I'm putting the same diameter pipe on it, That's on it now. Thanks for all the INFO.

A Star Ride · 04-03-2010, 04:21 PM

The diameter isn't of issue, its how "free" the exhaust leaves the cylinders. Sure they could engineer the on board computer to self adjust, but then they cant sell you the downloads for $80 a pop. They (nor anyone else) aren't in the business to make it easy or simplify, but rather then to get as much money as possible. I'll also say that the engineers designed that bike, and the pipes on it to work together properly, I'd leave well enough alone.

MOKE1K · 04-04-2010, 07:43 AM

Quote:

Originally Posted by mscuddy

You have to get the ECM re-mapped to make up for the lower backpressure and scavenging that the cylinder does at lower backpressures, you have to richen it up a taste, or you run the chance of burning valves, pistons, etc. Also it will run slower and make more niose if you don't get the fuel circuit reset for the pipes. It will probably make more noise and go slower anyway, but make that loud speed-boat noise all us Harley guys covet.

Not you to?

Bummer.

MOKE1K · 04-04-2010, 07:53 AM

Listen to both of them and do yourself a favor, do it right. Even though it may cost you more money, it's worth it. Think about getting a stumble in traffic when some idiot cager pulls out in front of you and you hit the throttle but nothing happens at first then it takes off like a rocket.

Stock pipes have more baffling which creates more restriction. Once you add the aftermrket exhaust it flows alot more. Thats when adding more fuel is needed. Good luck and no matter what anyone tells you about removing baffles to make more power they are as equally ignorant.

sarnali2 · 04-04-2010, 08:34 AM

as long as you use the stock air cleaner and air box you should be fine with the pipes. Harley uses a closed loop fuel injection system which will adjust to minor changes in exhaust flow. At least try the pipes first and see how it runs, you can always do a reflash if you need to. Hang on to your stock parts though so when the big motorcycle noise crackdown comes you can change back.

seruzawa · 04-04-2010, 01:12 PM

Changing pipes should be done with a dyno and exhaust gas analyzer. If you can't borrow, rent or get someone who uses those things then do some roll-on tests with the stock bike, like how long to takes to accelerate from 50-70 in top gear. Put on the new pipes and try it again. If it is slower than stock then get the new map. Test it again. If you are faster than stock then cool. If not return to stock and stop wasting money.

You should also put in new spark plugs and go out and run the bike hard for a few miles. Then pull the plugs. They should be a light grey. If they are white you are too lean. If they are black they are too rich. Slightly rich is better than lean. Lean means too hot and can burn valves or hole pistons.

MOKE1K · 04-04-2010, 08:08 PM

In other words if the graph shows its falling off from peak horsepower it's lean, if the line climbs up from peak horsepower its rich. Use a Dyno, like Seru says in his round about way.

sarnali2 · 04-05-2010, 02:10 PM

actually leave it alone and ride the dam* thing, they run and sound just fine stock

04-02-2010, 06:13 PM	#1
sam13 Registered Member Join Date: Apr 2010 Posts: 2	exhausts I just got a 2010 Harley Davidson Iron sportster . I want to change the exhausts on it to short staggered Vance & Hines . but some people say i need a fuel pack to where some say no .Or i need to put Power command or some other crap . Can't i just put on the new exhausts and that's it? I know Harley Davidson wants me to buy all kinds of stuff spend that money. If any one has any info it will be really appreciated .. Thank You..

04-02-2010, 06:29 PM	#2
mscuddy MODERATOR X Join Date: Jun 2007 Location: Next to my still checkin the temp. Posts: 5,444	You have to get the ECM re-mapped to make up for the lower backpressure and scavenging that the cylinder does at lower backpressures, you have to richen it up a taste, or you run the chance of burning valves, pistons, etc. Also it will run slower and make more niose if you don't get the fuel circuit reset for the pipes. It will probably make more noise and go slower anyway, but make that loud speed-boat noise all us Harley guys covet. __________________ A gun is a tool, Marian; no better or no worse than any other tool: an axe, a shovel or anything. A gun is as good or as bad as the man using it. Remember that.

04-03-2010, 05:39 AM	#3
sam13 Registered Member Join Date: Apr 2010 Posts: 2	exuhast But doesn't the computer have a big enough range there, for it to adjust it self, for how lean or how rich to make it self . And that I'm putting the same diameter pipe on it, That's on it now. Thanks for all the INFO.

04-03-2010, 04:21 PM	#4
A Star Ride Registered Member Join Date: Oct 2009 Location: central Va Posts: 1,126	The diameter isn't of issue, its how "free" the exhaust leaves the cylinders. Sure they could engineer the on board computer to self adjust, but then they cant sell you the downloads for $80 a pop. They (nor anyone else) aren't in the business to make it easy or simplify, but rather then to get as much money as possible. I'll also say that the engineers designed that bike, and the pipes on it to work together properly, I'd leave well enough alone. __________________ White Trash Hick from Appalachia

04-04-2010, 07:53 AM	#6
MOKE1K Registered Member Join Date: Jul 2008 Location: Kalapana, Big Island Posts: 3,956	Listen to both of them and do yourself a favor, do it right. Even though it may cost you more money, it's worth it. Think about getting a stumble in traffic when some idiot cager pulls out in front of you and you hit the throttle but nothing happens at first then it takes off like a rocket. Stock pipes have more baffling which creates more restriction. Once you add the aftermrket exhaust it flows alot more. Thats when adding more fuel is needed. Good luck and no matter what anyone tells you about removing baffles to make more power they are as equally ignorant. __________________ "YOU CAN'T BOLT ON SKILL" "The only thing limiting your bike, is you" We survived Bush you'll survive Obama! "the most fundamental fact about the ideas of the political left is that they do not work. therefore we should not be surprised to find the left concentrated in institutions where ideas do not have to work in order to survive." --thomas sowell

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04-04-2010, 08:34 AM	#7
sarnali2 Aging Cafe` Racer Join Date: Jun 2007 Location: Sittin' down by my window, lookin' at the rain. Posts: 8,132	as long as you use the stock air cleaner and air box you should be fine with the pipes. Harley uses a closed loop fuel injection system which will adjust to minor changes in exhaust flow. At least try the pipes first and see how it runs, you can always do a reflash if you need to. Hang on to your stock parts though so when the big motorcycle noise crackdown comes you can change back. __________________ "Carpe` Throttelum -Loud Suits Save Lives" "All the BMW riders in the room, I want you to leave. Now. Out. "

04-04-2010, 01:12 PM	#8
seruzawa Robby Join Date: Nov 2001 Location: 8501 ft. Posts: 16,803	Changing pipes should be done with a dyno and exhaust gas analyzer. If you can't borrow, rent or get someone who uses those things then do some roll-on tests with the stock bike, like how long to takes to accelerate from 50-70 in top gear. Put on the new pipes and try it again. If it is slower than stock then get the new map. Test it again. If you are faster than stock then cool. If not return to stock and stop wasting money. You should also put in new spark plugs and go out and run the bike hard for a few miles. Then pull the plugs. They should be a light grey. If they are white you are too lean. If they are black they are too rich. Slightly rich is better than lean. Lean means too hot and can burn valves or hole pistons. __________________ I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tanhauser Gate. All those moments will be lost in time, like tears in the rain. Last edited by seruzawa : 04-04-2010 at 01:20 PM.

04-04-2010, 08:08 PM	#9
MOKE1K Registered Member Join Date: Jul 2008 Location: Kalapana, Big Island Posts: 3,956	In other words if the graph shows its falling off from peak horsepower it's lean, if the line climbs up from peak horsepower its rich. Use a Dyno, like Seru says in his round about way. __________________ "YOU CAN'T BOLT ON SKILL" "The only thing limiting your bike, is you" We survived Bush you'll survive Obama! "the most fundamental fact about the ideas of the political left is that they do not work. therefore we should not be surprised to find the left concentrated in institutions where ideas do not have to work in order to survive." --thomas sowell

04-05-2010, 02:10 PM	#10
sarnali2 Aging Cafe` Racer Join Date: Jun 2007 Location: Sittin' down by my window, lookin' at the rain. Posts: 8,132	actually leave it alone and ride the dam* thing, they run and sound just fine stock __________________ "Carpe` Throttelum -Loud Suits Save Lives" "All the BMW riders in the room, I want you to leave. Now. Out. "