Go Back   Harley Davidson Forums > Harley Davidson Tech & Mechanical Forum > Exhaust System Topics
Sign in using an external account
Register Forgot Password?
Search


Exhaust System Topics New and old exhaust system discussions. Fitment issues to sound bites and suggestions. Post them here.
Sponsored by: Samson Exhaust

Reply
 
 
 
P
 
Thread Tools Search this Thread
  #1  
Old 06-01-2006, 04:45 PM
Chatham Bob Chatham Bob is offline
Hang Around
Join Date: Jun 2006
Location:
Posts: 35
Default Drag pipes and performance????

I'm considering putting some very short drag pipes on my Street Bob. I really like the ones on FXDBI's (member name) bike http://www.hdforums.com/m_479002/tm.htm ...those look real mean. I'm guessing those are cut, FXDBI? anyone?
I'm no speed freak, but I do enjoy reaching the speed limit quick. That being said...what can I do to help with the overall performance of my bike with pipes like FXDBI has? I want to do the best I can to keep my low and mid range. I'm planning on getting a Power Commander and an air cleaner. I like the look of the Bad Azz V Charger or a spike...suggestions? What about insert baffles? Cones?
Any other suggestions greatly appreciated.
Reply With Quote
  #2  
Old 06-01-2006, 06:37 PM
Steeltown Steeltown is offline
Senior Rider
Join Date: Jan 2005
Location:
Posts: 385
Default RE: Drag pipes and performance????

Drag pipes, with no baffles, will send your HP right out the exhaust...there are plenety of pipes with plenty of great sound that will not decrease your horsepower
__________________
www.hawgzone.com
Reply With Quote
  #3  
Old 06-01-2006, 06:45 PM
twowheelsforever's Avatar
twowheelsforever twowheelsforever is offline
Senior Rider
Join Date: May 2006
Location:
Posts: 467
Default RE: Drag pipes and performance????

I was also under the impression that the new Street Bobs have the O2 sensors for the fuel injection mounted right into the exhaust, which probably limits the selection of pipes available...
Reply With Quote
  #4  
Old 06-01-2006, 11:43 PM
toolbox's Avatar
toolbox toolbox is offline
Road Master
Join Date: Apr 2006
Location: Oklahoma
Posts: 848
The Toolbox
Default RE: Drag pipes and performance????

Just wanted to suggest a possibility, My wife recently got a street bob & they do have o2 sensor exhaust set-up--limited availabilty on whats out there. We ended up putting BASSANI pro street exhaust on hers-----sounds very good, has great appearence & PERFORMANCE, havent had it dynoed yet but just has screamin eagle air cleaner & stage one download---Would recommend pcIII usb if available & have it properly tuned on dyno once your pipes are on. Hears a pic of her bike.
Good luck on the exhaust hunt.
RIDE HARD LIVE FREE<
TOOLBOX

[IMG]local://upfiles/11196/7C00D0BEF8D14803B77E1C89707498D6.jpg[/IMG]

[IMG]local://upfiles/11196/1C6C990CD54D4C489BE760F2133D67CD.jpg[/IMG]
__________________
LIVE FREE RIDE HARD AND KEEP THE RUBBER SIDE DOWN
Reply With Quote
  #5  
Old 06-02-2006, 01:03 AM
soz soz is offline
Hang Around
Join Date: Mar 2006
Location: Ontario, Canada
Posts: 87
Default RE: Drag pipes and performance????


Quote:
ORIGINAL: Steeltown

Drag pipes, with no baffles, will send your HP right out the exhaust...there are plenety of pipes with plenty of great sound that will not decrease your horsepower

Actually they increase HP, what i believe you meant was torque. They will hurt your low/mid torque a bit and thats the problem cause thats where most of us ride.
Reply With Quote
  #6  
Old 06-02-2006, 01:58 PM
95BadBoy's Avatar
95BadBoy 95BadBoy is offline
Prospect
Join Date: Feb 2006
Location:
Posts: 148
Default RE: Drag pipes and performance????

the lollypop trick will help on stright pipes. The SERT has more adjustments than
the PCIII good for dyno tunning.
__________________
Build it Loud and Fast then Drive the tires off it.

Stage-4 HD 95HP+ engine kit w/Branch #5 heads & 42mm Mikini
10.5 pistons, 3/8 Moly adj push rods, SE-57 Cam, Dyna 2000i Ign
SE big bore int. 80000 volt coil, 10mm wires, Comp. Release's
New S&S.600 cam added & V&H Pro pipe. not re dynoed yet
Reply With Quote
  #7  
Old 06-03-2006, 03:35 AM
mp's Avatar
mp mp is offline
Outstanding HDF Member
Join Date: May 2005
Location:
Posts: 2,125
Default RE: Drag pipes and performance????

Drag pipes are good for one thing and one thing only- WIDE F.....G OPEN! It's foolish to install them and then screw around with lollipops to try to make them what they're not. You need a certain amount of exhaust volume to make low end power and skinny old drag pipes just don't have it.
__________________
"A motorcycle is a spiritual object........
When I ride I'm exactly in the moment........it's like meditation. I'm in the flow."
- Indian Larry
Reply With Quote
  #8  
Old 06-03-2006, 08:20 AM
tripl8 tripl8 is offline
Road Captain
Join Date: Oct 2005
Location: Lynnwood WA.
Posts: 564
Default RE: Drag pipes and performance????

Drag pipes worked well on Pans ..thats about it.
Reply With Quote
  #9  
Old 06-03-2006, 08:59 AM
Uncle Peepers Uncle Peepers is offline
Prospect
Join Date: Jan 2006
Posts: 290
Default RE: Drag pipes and performance????

The reason drag pipes are called drag pipes is because short WFO races is the only thing they're good for. A reasonable amount of scavenging is required for making decent power over a wider range of engine rpm's. Often described as the result of backpressre, scavenging actually results from the tuned or reasonant frequency of the exhaust pipes. A proper reasonant frequency results from the right combination of pipe length, diameter, and baffeling. Drag pipes produce a single reasonant frequency only at very high engine rpm's.

Science aside, I personally hate drag pipes. They irritate everyone, especially non-bikers, and they, as much as anything, will incur the ire of the EPA and cause its wrath to descend on everyone. And nobody can make a good public case in defense of drap pipes.

Uncle Peepers
Reply With Quote
  #10  
Old 06-03-2006, 11:31 AM
Chatham Bob Chatham Bob is offline
Hang Around
Join Date: Jun 2006
Location:
Posts: 35
Default RE: Drag pipes and performance????

Thanks for the replies...I'm really just at a stand still. I feel like most all of the aftermarket exhausts for Dynas look pretty much the same.. Yeah, a different angle of slash or a staggered a litte but pretty much the same. Those drags on FXDBI's are just sick looking.
Sounds like Peepers is still running stocks too....he sounds bitter. I'm just giving you hell. I obviously disagree with you and have seen plenty of pics of other members' bikes on this site that disagree as well. I understand the performance drawbacks as well, but am having trouble deciding if the aesthetic value outweighs the performance.
Also....this board is great! A wealth of knowledge.



I wanted my pipes yesterday!!!!
Reply With Quote
Old 06-03-2006, 11:31 AM
 
 
 
P
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
T-Bars / Drag Bar Pics on Street Bob? chris_FXDBI Dyna Glide Models 15 05-15-2014 12:01 PM
r 23" front wheel for FXDBI street bob model JeiT Dyna Glide Models 25 04-14-2014 09:51 PM
WTB: Black out Parts for Street Bob MA-FXDBI-DB Want To Buy Motorcycles/Parts/Accessories 6 11-15-2013 05:27 AM
Got a NEW BIKE today, which 1 of mine do you guys like best TheGuyWhoPosted Dyna Glide Models 24 06-08-2008 06:39 PM
Drag pipes Chatham Bob Dyna Glide Models 1 06-01-2006 10:24 AM


Tags
bob, decreas, drag, drap, harley, horsepower, ideal, install, length, lollipops, making, motorcycle, pipes, power, produce, street


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join HDForums

Advertising
Featured Sponsors
Vendor Directory
Sponsors

All times are GMT -5. The time now is 12:49 AM.


Internet Brands, Inc.