Do i need a tune?
Thread Starter
|
Novice
Joined: Apr 2011
Posts: 23
Likes: 0
From: ohio
Do i need a tune?
New here, take it easy on me.
I have a 2011 RK with about 500 miles on it. I have carriage work slip ons, everything else is stock. If i remove the cat, do i need to retune?
Tommorrow is suppose to 80, today im thinking about removing the cat but I want to make sure I dont hurt it. Then in a couple weeks I will stage 1 it with PC5 and then DYNO.
thanks
I have a 2011 RK with about 500 miles on it. I have carriage work slip ons, everything else is stock. If i remove the cat, do i need to retune?
Tommorrow is suppose to 80, today im thinking about removing the cat but I want to make sure I dont hurt it. Then in a couple weeks I will stage 1 it with PC5 and then DYNO.
thanks
MODERATOR
Joined: Oct 2007
Posts: 4,108
Likes: 1,964
From: New England
Most every motor will run considerably better (more efficiently, cooler, last longer) if it's tuned properly.
Does this NEED to be done? Probably not...
Does this NEED to be done? Probably not...
Supporter
Joined: Aug 2008
Posts: 5,189
Likes: 16
From: N.E. Wisconsin
If you just change the slipons, no.....but once you let the Cat out, yes. You need to get a tune or a tuner. The Cat controlls alot of the backpressure, without the tune you will loose a considerable amount of your low to mid-range torque.
Last edited by drukanfu; Apr 9, 2011 at 08:07 PM. Reason: wanted to splan more.
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
Likes: 31
From: earth
You only need to tune your bike if you want it to run at optimum performance.
Tourer
Joined: Jul 2005
Posts: 314
Likes: 1
From: Mass.
Trending Topics
Supporter
Joined: Aug 2008
Posts: 5,189
Likes: 16
From: N.E. Wisconsin
You loose the venturi effect of the exhaust pulse. The exhaust flow is interupted and has to spread the pressure out evenly against the cat wall. You get your area of flow after the cat absorbs the heat but in turn loose back pressure. It also restricks your sound in a similar matter.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
Likes: 31
From: earth
You loose the venturi effect of the exhaust pulse. The exhaust flow is interupted and has to spread the pressure out evenly against the cat wall. You get your area of flow after the cat absorbs the heat but in turn loose back pressure. It also restricks your sound in a similar matter.
Seasoned HDF Member
Joined: Jan 2007
Posts: 20,616
Likes: 4,440
From: anacoco, la
y'all may be rocket scientists, and all that may be the 'correct' answer, but in my case, after i removed the cat, i did not notice any of what you say. time didn't start running backwards and the world did not end. in other words, the ecm did not throw any codes. what did happen, however, was a very dramatic decrease in the amount of heat by my right leg. my performance did not decrease, my mpg did not suffer, the exhaust did sound a whole lot better though, both the stock muffler and the se nightstick.
i ran my bike with the stock ac, cat removed headpipe, and se nightstick, and no additional fuel management for almost a year (13,000 miles) with no problems. i've only just recently added the se ac and powervision tuner, and still loving it!
i ran my bike with the stock ac, cat removed headpipe, and se nightstick, and no additional fuel management for almost a year (13,000 miles) with no problems. i've only just recently added the se ac and powervision tuner, and still loving it!