Does computer have to be remapped after headpipe change or cat removal?
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
Likes: 224
From: Glendale AZ
I got my original map from FuelMoto with the PCV for a stock air cleaner with jackpot slip's. After putting on an open breather and went to Fatshotz I asked for a map for that particular change and then compared it to the original one they sent me...exact same map to the letter, nothing different whatsoever.....If I use that as guide then I would say NO, but I do find it hard to believe nothing on a map with hundreds of ignition and fuel tables changed going from a stock breather to a stage 1 breather? So either there's no difference going to a stage 1 breather or they are so used to handing out the same map to everyone.... I cant help wondering though if I did myself a disservice by not getting a proper tune even if it runs just fine....
Last edited by TUCCI; Jul 28, 2013 at 06:51 PM.
Road Master
Joined: Mar 2013
Posts: 1,151
Likes: 14
From: Seattle
Sorry, it's a 2011 SG w/103. It does have a stage one breather and slip-ons. The last time I posted about it not being tuned or re-mapped with the stage one and slip-ons, everyone talked about how I at least needed to get it remapped but now it seems like you guys are saying that was just a waste of $200 bucks if I'm following you right?
Last edited by Hausguy; Jul 28, 2013 at 07:24 PM.
Club Member
Joined: Jul 2012
Posts: 2,697
Likes: 10
From: San Angelo, Texas
Since the stage 1 ECM flash isn't dependent on rather you have opened up the breather or changed pipes. All it is, is a very generic map that the dealer puts in. So, in answer to your question, no, if you de-cat the header, or change out headers and exhaust, you already have the ECM flashed. The next step is to TUNE the thing, adding either a SERT or Powervision or whatever else you decide at that time, and turn it over to someone with a dyno that knows what they are doing!!! A stock stage 1 flash is 90% under the BEST of circumstances, and any map that wasn't done on site with your bike is not going to be more than 95% accurate. So spend the money, get a tuner that changes the ECM, not just tricks it into doing what the box wants, and let someone who knows what they are doing tune it. You'll be glad you did!
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
As long as you haven't eliminated the 02 sensors. The ECM will take the readings during closed loop operation and adjust the AFR to 14.6 to 1. That would be true for changing the cat, mufflers and breather. That is what the 02 sensors and ECM do to keep the bike EPA compliant.
After the changes the ECM will learn what it needs to do during the first ride.
After the changes the ECM will learn what it needs to do during the first ride.
Ultimate HDF Member
Joined: Mar 2012
Posts: 6,129
Likes: 143
From: Santa Cruz
As long as you haven't eliminated the 02 sensors. The ECM will take the readings during closed loop operation and adjust the AFR to 14.6 to 1. That would be true for changing the cat, mufflers and breather. That is what the 02 sensors and ECM do to keep the bike EPA compliant.
After the changes the ECM will learn what it needs to do during the first ride.
After the changes the ECM will learn what it needs to do during the first ride.
Elite HDF Member
Joined: Oct 2010
Posts: 3,504
Likes: 12
From: DOWN SOUTH
Sorry, it's a 2011 SG w/103. It does have a stage one breather and slip-ons. The last time I posted about it not being tuned or re-mapped with the stage one and slip-ons, everyone talked about how I at least needed to get it remapped but now it seems like you guys are saying that was just a waste of $200 bucks if I'm following you right?
There are a lot of riders on the forums that have a complete stage 1 and the HD download and are perfectly happy with how their bike runs and there are also alot of riders out there that say the HD download only raises the rev limiter and is still EPA compliant. Your bike has the stage 1 complete and the HD download, it will run fine just the way it is. You can make all the header, exhaust changes you want and it should still be good to go as long as you do not add cams. If you decide to go to a stage 2, you will need to have it properly tuned. As others have mentioned, as your bike sits now, it would run better with a good tune but its your choice, you have already done the download it needs. Just my .02. Good luck with your bike, stay safe bro.
Tourer
Joined: Apr 2007
Posts: 375
Likes: 1
From: Sacramento area
I changed mine out with a stock HD head pipe with no cat I already had the stage one mine runs fine no popping or backfiring on deceleration & a lot less heat on my leg
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
6 Weirdest Harley-Davidsons Ever Sold to the Public
Verdad Gallardo
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
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
Ultimate HDF Member
Joined: May 2008
Posts: 7,439
Likes: 884
From: 'Noke, VA
As long as you haven't eliminated the 02 sensors. The ECM will take the readings during closed loop operation and adjust the AFR to 14.6 to 1. That would be true for changing the cat, mufflers and breather. That is what the 02 sensors and ECM do to keep the bike EPA compliant.
After the changes the ECM will learn what it needs to do during the first ride.
After the changes the ECM will learn what it needs to do during the first ride.
Thread
Thread Starter
Forum
Replies
Last Post