Online: GGUser713

Exhaust diameter

  • matho1961
    matho1961
    7 years ago
    Just bought myself a 2017 street glide and got some screaming eagle slip ons with the deal. I noticed with these slip ons you can change the end caps (Sorry first time I've had a tourer). They are 4 1/2" inches OD and Im wondering is this a common size, as Im thinking of changing them. 
  • Ken in Cairns
    Ken in Cairns
    7 years ago

    I'm pretty sure the Screaming Eagle Slip-ons are a re-badged Supertrapp.

    My Supertrapp disc's and cap are 4 inch, they do a system using 5 inch ones as well.

    You can ask the dealer :)

    Enjoy the new ride :)

    Cheers 

  • steelo
    steelo
    7 years ago
    Google mate. Google
  • Ken in Cairns
    Ken in Cairns
    7 years ago

    Sorry mate, Supertrapp are an exhaust system.

    See this link 

    You can run different numbers of discs to change (and tune) the back pressure in the exhaust, and run an open or closed cap.

    I just changed from a closed to an open cap and am retuning the EFI now as it was running a little lean after the change, I guess she can breath now, and it sounds like a Harley again.

    Cheers



  • steelo
    steelo
    7 years ago
    No. But someone tells you the SE mufflers on your bike are possibly a rebadged supertrapp and you say WTF are they.
    THAT'S when Google comes in handy. The forum is not there to wipe your ass
  • steelo
    steelo
    7 years ago
    In my defence I did put a link in for the OP
  • fatbat
    fatbat
    7 years ago
    Haha I'm with steelo on that. 
    Supertrapp make good exhaust products. Have a look at their site. Some of their end caps are ridiculously priced though. I just use the plane open endcap. Enjoy the new Tourer 
  • JFE
    JFE
    7 years ago
    It's all good Matho. Steelo is a good bloke who likes a laugh. 
    This Forum is full of a lot of experienced blokes. Ask away I say and when you learn something along the way, post it up for others benefit. Cheers.
  • matho1961
    matho1961
    7 years ago

  • matho1961
    matho1961
    7 years ago
    Found this on the box with the original mufflers in them. So everybody stop panicking lol.

  • Ken in Cairns
    Ken in Cairns
    7 years ago

    Sorry for the typo and all the aftermath :(

    Hope you sort out a cap, some on fleabay are nearly affordable.

    Some are just fancy alloy ones, but the one's I would look out for are the adjustable ones for tune ability.

    Good Luck

    Cheers

  • Ken in Cairns
    Ken in Cairns
    7 years ago

    Your welcome.

    As I said I just changed over to the plain open cap now, and currently have 20 discs installed, and hopefully will do a highway tuning run tomorrow.

    It is a LOT louder that before, I might see how it goes, and take out 5 discs and see if it feels better or worse after I get the EFI map sorted.

    Cheers

  • allde
    allde
    7 years ago
    What ever you do Matho1961 don't get rid of your OEM exhaust,
    it's the only one that would help you pass a road worthy or EPA test if needed.
  • steelo
    steelo
    7 years ago
    As it turns out. A picture of the part indicates it MAY NOT be one of the disk style supertrapps. This image may assist if anyone has ideas. Personally I wouldn't change anything. They look good.

  • Ken in Cairns
    Ken in Cairns
    7 years ago

    No it doesn't look like a tuneable style Supertrapp system Steelo.

    If you go onto the Supertrapp site all the questions about the discs will be answered, but in short, no they are separate to the end cap Matho, you can add or subtract them to change the backpressure of the exhaust.

    Yes I do my own tuning, I would advise you not to get the Screaming Eagle Race tuner (SERT for short) (and DEFINATLY not the Street tuner !!!))

    There are much better ones available, that do a better "Smart Tune" than the SERT, and also have more functions.

    I have the SERT and while it does allow for some tuning of the VE and Fuel tables, as well as a few more things, it is a bit limited, especially coupled with the narrow band O2 sensors fitted as stock.

    If the bike didn't come with it I would have bought a Power Vision.

    Once you plug these things into the bike, they "Marry" to the ECU and are then locked to that bike.

    I'm not right up on the Power Vision, but do know it has an LCD display you can mount and dismount, and is a lot more user friendly (like you don't have to be back at the computer to do the basic auto tuning if I understand correctly) from what I have read about it compared to the SERT.

    The SERT is hung of the bike during recording runs (like the Power Vision) but has no display.

    You set it into data gathering mode via a computer and long printer/USB cable and the SERT to bike Harley cable and plug it back in to the computer to download the data, do it wrong and you lose all those tuning runs you just did !

    I do the download before shutting the bike down, with a big arse fan blowing onto the engine, only takes a minute or so.

    The SERT manual doesn't really tell you shit about actually tuning the bike as such (like what a good fuel map looks like etc), just how to do it.

    Hope that helps a little, I'm still learning about it all myself mate :)

    Used to multiple carbs and points, old school :)

    Cheers

  • matho1961
    matho1961
    7 years ago


  • mickle
    mickle
    7 years ago
    Nothing wrong with the Tuner, ensure you have a good dyno man.