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

New Exhaust = Change Ecu?

Discussion in 'Technical Help' started by RoadRunner, Feb 3, 2020.

  1. Hi, if I replace standard end cans with Termignonis do I need to upgrade/flash the ECU and/or change anything else? Also, is the change worth the cost apart from the look? RR.
     
  2. Any open pipe will lean the mixture.
    The software on the ECU has a compensator built into it for atmospheric condition changes but it can't remap itself to optimise for a new system for example.

    You typically get a couple of HP gain but the majority of the work is already done at the primary pipes.

    The performance ECU typically just dumps more fuel to compensate for the lean spot. Ideally best practice is always to dyno and setup the bike that way. reason being that a good dyno operator can extract the best curve for your riding style.

    If this is for your 848 then I'd look to someone like Chris at CJS in bristol - he'll do dyno setup but can remap your exisiting stock ecu as well.

    As to worth the cost, it depends how much value you place per HP, but the soundtrack alone will be amazing if you just swap the pipes out. :)
     
    • Thanks Thanks x 1
  3. Thanks Sev, not so concerned with HP figures (fast enough as it is, for now); just wanted to ensure if I swop the end cans over on my 848 I won't destroy the engine in an instance. Sounds like I can swop and then get a dyno/ECU map later without issues?
     
  4. you need to dyno it to see it is running across the rev range at a variety of loads at the correct fuel to air mix, ie won't blow up. the fact more power generally comes from this is a bonus.

    im sure you'll be fine for a while but the point is you'll never know its wrong until you look or it blows up!
     
    • Thanks Thanks x 1
  5. Without the dyno or performance ECU you'll find it'll probably run worse (relatively speaking) than the stock pipes.
    What you'll get though is your end pipes having a nice light grey colour if you're nailing it everywhere or the lovely oily black of richness if you're pootling. For everyday riding at mere mortal commuting and weekend conditions you'll probably notice the flat spots in the power delivery more.

    The ecu compensation will allow around 10% each way so he'll have it running leaner up top and richer at the bottom with some dips in the power curve - that's why the DP ecu just pisses more fuel in to compensate.

    Dyno is good practice as it not only sets the bike up right but also takes out engine build variance idiosyncrasies and it'll also help to smooth out some of the dips put in at the factory to get past various regional emission and noise legislations.
    As the years have gone on manufacturers have made their stock setup leaner and leaner as well to get round emissions declarations.
     
    • Thanks Thanks x 1
  6. Ummm.... I may well leave it for the time being then. I won't be riding it flat out that's for sure so won't need the extra HP (just yet) and Bristol is a long to go for a dyno. Will ponder this one - but really appreciate the quick and comprehensive (tech) advice from you guys. What a great forum!!
     
  7. any dyno will do, but you'll be paying for a power commander on top. Or if you're nervous just get a performance ecu.

    If it were me and money's tight, buy a stock ecu off the bay and get @chrisw off this parish to flash it for you. :)
    You'll be fine running with them without mapping, as I say you'll just notice the dips a bit more.

    You're really not going to notice power increases of 2bhp - what you'll perceive as power increase is better throttle response.
     
    • Thanks Thanks x 1
Do Not Sell My Personal Information