2016 ECU/EFI performance

Discussion in 'Speed Triple' started by Nostromo1, Oct 6, 2016.

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  1. Nostromo1

    Nostromo1 New Member

    Oct 5, 2016
    0
    1
    usa
    Hello,
    I purchased a new Speed Triple S about two months ago and it has accumulated about 650 miles over that time. Since there were a few other posts on the 2016, I was wanting to sound out the owners about their observations of the ecu mapping. This is by far the smoothest running engine on a modern bike that I've experienced (test samples have included bmw R1200R and Ducati Monster). In first and second gears, it's great, even pulling from say 2000 rpm in the city. However, in third and fourth gears, between 3000-4500 rpm, there seem to be a noticeable stutter when at a constant speed (i.e light load) or on a slight downgrade. I can actually feel a little driveline lash (hammering sensation) in the foot pegs. If you roll in some throttle, or accelerate moderately through that range, you don't feel it. It feels exactly like my previous Monster at around 3k rpm. I installed the Boosterplug last week, and, well, I don't think it made much of a difference. Other than this issue, it's a great motorcycle.
    I'd like to hear your evaluation of the EFI mapping, especially in the 3-4.5k range. Thanks.
     
  2. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,064
    1,000
    Central France
    Hi there, I must admit that I haven't ridden you exact model but I have ridden a number of different modern Triumphs and they all, to a greater or lesser degree have one issue - low throttle dodgy performance.

    Between 0% and about 10% of max throttle they can feel like they stutter and this is due - imo - to a combination of design element to achieve the Euro 5 and 6 pollution levels. Both the Ai system and the O² sensor(s) feed information to the ECU to tailor the fuelling to be as lean as they can get away with, within the throttle range of you guessed it - 0 - 10% of full throttle.

    So as you turn the throttle on or off, or ride on a constant light throttle, you are in this range and the fuelling is being constantly adjusted; also once over 10% of throttle this effect is reduced or completely stopped.

    There are ways to stop this happening but maybe not to be applied to a brand-new, still under warranty bike.
     
  3. Yorkshireman

    Yorkshireman Crème de la Crème

    Dec 12, 2015
    3,401
    1,000
    Barnsley
    I experienced a similar sensation when test riding a 2016 Speed triple R and quite frankly I didn't like it at all compared to my 2015 S. The biglad is correct, the cause of the stuttering is the new fly by wire throttle system needed to comply with the lower emissions. Basically at very low throttle openings the bike is changing between the closed and open loop circuits in the fuel injection. One has a slightly richer mixture than the other and that slight surging, or stuttering as you describe is the result. What to do about it though, that is another question.
     
  4. topbanana0

    topbanana0 Well-Known Member

    Mar 27, 2016
    226
    93
    South Wales
    I posted something similar a while ago, I can't quite put my finger on it but think I know what you mean.
    I find the bike mostly smooth, but like you say, at constant speed I feel what I would describe as ' hunting' like a very gentle lurch/stammer?
     
  5. Yorkshireman

    Yorkshireman Crème de la Crème

    Dec 12, 2015
    3,401
    1,000
    Barnsley
    This was very evident on the MT 09 I had, cracking motor spoiled by shit fueling and the well reported snatchy throttle response. An Australian guy, wizard with ecu's etc, did his own research and developed an O2 controller to stop the Ecu constantly switching between the closed and open loop fuel map. Search eBay for Kevxtx to see the full tech explanation.
     
  6. Nostromo1

    Nostromo1 New Member

    Oct 5, 2016
    0
    1
    usa
    All online investigations had led to a lean burn operating condition, which is why I tried the Boosterplug. It fits in series with the air temp sensor in the airbox (came with Triumph specific plugs) and lowers the sensor output to resemble a 20 degrees cooler ambient temperature, which in turn is supposed to let the ecu richen the motor. But, as others have commented, as soon as the ecu transfers to closed loop O2 sensor based control, the bike regresses to its former stammering self. I'll look into the O2 sensor gizmo now. Bummer that one has to do this with a new bike, but what I haven't been able to ascertain is why does this issue only plague motorbikes? One liter cars can pass the latest emission standards and won't stutter once over a hundred thousand miles... in nearly any operating condition.
     
  7. Yorkshireman

    Yorkshireman Crème de la Crème

    Dec 12, 2015
    3,401
    1,000
    Barnsley
    Kev developed the O2 controller initially for KTM's then moved on to the Yam when he bought one, as far as I know he doesn't do one for the Triumph. You may have to consider taking it to a dyno specialist and having it set up specifically to your requirements.
     
  8. t552

    t552 Senior Member

    Nov 17, 2014
    415
    113
    Bristol UK
    wouldn't surprise me if the tb's are slightly out of balance. It makes a massive difference on slow speed smoothness.
    No need for booster plug as it messes up adaptions and causes more problems than they are worth.
     
  9. capt

    capt Elite Member

    May 8, 2016
    3,052
    750
    western Australia
    Use tuneecu. Turn of the oxygen sensors in the header pipes, this forces the bike to run on one setting. Closed loop I believe it's called. I have done this on my 2000 sprint when I had it, and now on my 2008 America , went one step further late last year I removed the sensors
     
  10. t552

    t552 Senior Member

    Nov 17, 2014
    415
    113
    Bristol UK
    can't use tune ecu on later models with immobiliser.
     
  11. Backtobasics

    Backtobasics Member

    Feb 20, 2022
    27
    13
    Netherlands
    Was this issue solved?
    I recently purchased a Speed triple R 2016 and having the same problem.
    Chain has been replaced because is looked like there was a piece of the chain that was fault but the stutter is still there.
     
Loading...

Share This Page