Exhaust change question?
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Tourer
Joined: Aug 2019
Posts: 288
Likes: 141
From: Dental city
Exhaust change question?
I have a 2007 Road King that has too loud for memufflers. I want to change back to OEM slipons. The bike has a K&N air filter and a Dobek EFI tuner. What will happen if I simply change back to the original mufflers? Will it create too much of an obstruction for the current tune? Will it overheat? Any thoughts?
Road Warrior
Joined: Dec 2008
Posts: 1,999
Likes: 916
From: Madisonville, La
Probably not hurt anything. The only problem maybe running a little Rick from the back pressure. Not familiar with your tuner or if it has a menu where you can select "canned" tunes to match your new configuration. Many of the H-D CVO mufflers are straight through design and pretty quite. They are frequently on eBay for reasonable prices.
put them back on and see how she runs. I think with the dobeck, it has buttons to lean out or richen the mix....I'm reaching back years from when I has one and not sure but the pipe change should be no issue....nothing is gonna explode...lol....if you want to spend some $, get the supertrapp fatshots....quiet and tunable with discs
HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
Go here to find your bike, the click on view information to see the different settings for the TFI controller.
http://www.tficontrollers.com/Harley/default.asp
As for a quick walk through on gen1 and gen 2 controllers (running a Gen 2 myself),
First pot is the idle circuit gain, so once you have the motor fully warmed up, then adjust the first pot to the left until the you get the bike to idle the highest and leave it there (may have to go back to adjust the hot idle rpm speed via the injector body to bring the idle speed back to spec). Hence base setting will suggest someone like 3, so use that as your start point, but do fine adjustment on that pot until you you have the motor idling as high as you can get it.
On second pot to the right (think fuel pump like on a carb bike), since your still running the K&N filter, will be looking to set it between the stock and stage one setting. As for the pot numbers to set them, think face of a clock, and if the number for the setting is 6:00, pot slot would be straight down (don't use the slash lines on the pot face).
Third pot is your high speed circuit gain, while 4th is the RPM level on which the high speed circut fuel add will kick on. So would split the difference between stock and stage 1 on third pot, and last pot to the right, will be the same across the board for all the different base setting.
And again, before you set anything on the TFI, make sure that the engine is fully up to temp. Hence with TFI on the bike, it going to be running way rich as the ECM still has the mapping in cold phase, and once the motor fully warms up and your on the hot phase mapping, then it will be running correctly instead. Hence this is the glitch with the injector type add on controllers, since it just adds fuel over the stock mapping tables, and the OEM Harley mapping table already has them on the richer side until the bike warms up.
So really, in the end , will just be the two middle pot that may have to re-adjust in the end with some riding time.
Second pot from the left is how the throttle comes on with about 1/4 turn, while third pot from the right is how the motor comes on with the throttle about 3/4 of the way open in higher rpms.
If you find that as you are coming away from a stop that the motor is trying to stumble with light throttle twist (too much fuel), then back the second pot just a touch until motor warmed up no longer stumbles. At 3/4 throttle and revs about 4K, if the motor is not crisp/not pulling hard, then back off the third pot just a touch instead.
As for back to the mufflers, have you check to make sure that the problem is someone did not just pull the baffles to start with. Hence baffle stacks are easy enough to buy and Re-install, and would be a hell of lot cheaper than replacing the mufflers isntead. On some mufflers, you can add in a rear baffle insert stack to quiet them down as well. If you tell us what the mufflers are, then may be a cheap way to quiet them down.
http://www.tficontrollers.com/Harley/default.asp
As for a quick walk through on gen1 and gen 2 controllers (running a Gen 2 myself),
First pot is the idle circuit gain, so once you have the motor fully warmed up, then adjust the first pot to the left until the you get the bike to idle the highest and leave it there (may have to go back to adjust the hot idle rpm speed via the injector body to bring the idle speed back to spec). Hence base setting will suggest someone like 3, so use that as your start point, but do fine adjustment on that pot until you you have the motor idling as high as you can get it.
On second pot to the right (think fuel pump like on a carb bike), since your still running the K&N filter, will be looking to set it between the stock and stage one setting. As for the pot numbers to set them, think face of a clock, and if the number for the setting is 6:00, pot slot would be straight down (don't use the slash lines on the pot face).
Third pot is your high speed circuit gain, while 4th is the RPM level on which the high speed circut fuel add will kick on. So would split the difference between stock and stage 1 on third pot, and last pot to the right, will be the same across the board for all the different base setting.
And again, before you set anything on the TFI, make sure that the engine is fully up to temp. Hence with TFI on the bike, it going to be running way rich as the ECM still has the mapping in cold phase, and once the motor fully warms up and your on the hot phase mapping, then it will be running correctly instead. Hence this is the glitch with the injector type add on controllers, since it just adds fuel over the stock mapping tables, and the OEM Harley mapping table already has them on the richer side until the bike warms up.
So really, in the end , will just be the two middle pot that may have to re-adjust in the end with some riding time.
Second pot from the left is how the throttle comes on with about 1/4 turn, while third pot from the right is how the motor comes on with the throttle about 3/4 of the way open in higher rpms.
If you find that as you are coming away from a stop that the motor is trying to stumble with light throttle twist (too much fuel), then back the second pot just a touch until motor warmed up no longer stumbles. At 3/4 throttle and revs about 4K, if the motor is not crisp/not pulling hard, then back off the third pot just a touch instead.
As for back to the mufflers, have you check to make sure that the problem is someone did not just pull the baffles to start with. Hence baffle stacks are easy enough to buy and Re-install, and would be a hell of lot cheaper than replacing the mufflers isntead. On some mufflers, you can add in a rear baffle insert stack to quiet them down as well. If you tell us what the mufflers are, then may be a cheap way to quiet them down.
Last edited by Dano523; Jul 4, 2020 at 01:05 AM.
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