New pipes, less power
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Stage II
Joined: Oct 2009
Posts: 2
Likes: 0
New pipes, less power
I have installed new aftermarket pipes (slipons) and I seem to have less power. I had SE pipes on it that were installed back in '01. I have not dyno'd it, but I notice less power in 5th gear at 45 mph. I seem to be having to down shift more often. I notice a little more gurgle/pop when decelerating. I have tightened up the exhaust flange bolts, and as tight as the right slipon was when installed, I am sure I don't have any leaks. Orignally, the manufacture of the pipes said I would not need to do a stage one kit which also requires a HD download or PCM modification module. I really did not plan on shelling out another $300 to $600 after having to buy pipes. Everything you read says you get more power if you can move more air, but I say there is an important balance between "air flow in/out" and back pressure or the lack thereof. Is there a cheaper fix?
Road Warrior
Joined: Oct 2008
Posts: 1,832
Likes: 37
From: Rockland County, NY
I would have to say no. Freer flowing exhaust coupled with freer flowing intake makes a big difference but not without remapping the fuel injection program to match. Slip-ons alone are mostly good for noise.
Banned
Joined: Aug 2009
Posts: 771
Likes: 2
From: Hurricane,WV
You need more air coming in before the pipes will help. Try disconnecting the battery at bothe terminals for 2 minutes, then hook them back up again. You may be surprised how much better it runs.But, you need the stage one breather.
Advanced
Joined: Apr 2009
Posts: 72
Likes: 0
I have installed new aftermarket pipes (slipons) and I seem to have less power. I had SE pipes on it that were installed back in '01. I have not dyno'd it, but I notice less power in 5th gear at 45 mph. I seem to be having to down shift more often. I notice a little more gurgle/pop when decelerating. I have tightened up the exhaust flange bolts, and as tight as the right slipon was when installed, I am sure I don't have any leaks. Orignally, the manufacture of the pipes said I would not need to do a stage one kit which also requires a HD download or PCM modification module. I really did not plan on shelling out another $300 to $600 after having to buy pipes. Everything you read says you get more power if you can move more air, but I say there is an important balance between "air flow in/out" and back pressure or the lack thereof. Is there a cheaper fix?
From what you've wrote it seems that you have simply installed a slip on exhast system to your bike. You will not move any more air than before without taking in more air.
If you're looking for a power increase, you will have to add a free flowing intake. If you're taking in more air you will need more fuel.
I added Monster ovals to my 08 Street Glide without any additional modifications. I did it for looks and sound. Does my bike make less power?
I don't know, it was a slow bike from the begining.
Cruiser
Joined: Sep 2008
Posts: 247
Likes: 0
From: Texas
I have installed new aftermarket pipes (slipons) and I seem to have less power. I had SE pipes on it that were installed back in '01. I have not dyno'd it, but I notice less power in 5th gear at 45 mph. I seem to be having to down shift more often. I notice a little more gurgle/pop when decelerating. I have tightened up the exhaust flange bolts, and as tight as the right slipon was when installed, I am sure I don't have any leaks. Orignally, the manufacture of the pipes said I would not need to do a stage one kit which also requires a HD download or PCM modification module. I really did not plan on shelling out another $300 to $600 after having to buy pipes. Everything you read says you get more power if you can move more air, but I say there is an important balance between "air flow in/out" and back pressure or the lack thereof. Is there a cheaper fix?
Cruiser
Joined: Jun 2009
Posts: 204
Likes: 1
From: Westminster, MD
Since you said you had SE pipes put on in 01 i'll assume you've got a tc88. 5th gear when you hit 45mph is way too soon. i know it says that in the manual but you should try and keep your rpms above 2k at all times (other than 1st) to ensure our not lugging your engine. with my stage 1 tc88 i shift into 5th at 2800 rpms or around 60-65.
your horsepower is up near 3000 rpms.
your horsepower is up near 3000 rpms.
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Joined: Apr 2009
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