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Thread: General SBK Discussion Thread

  1. #851
    Rookie PedalTramp's Avatar
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    Default Short ratio 1st gear

    not an SBK question but again I did not no where to ask. What actually does "Short ratio 1st gear" mean in the features of Triumph Tiger 800 2018?
    2014 Hero Glamour - 9 BHP
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    Default Re: Short ratio 1st gear

    Quote Originally Posted by PedalTramp View Post
    not an SBK question but again I did not no where to ask. What actually does "Short ratio 1st gear" mean in the features of Triumph Tiger 800 2018?

    It means the 1st gear has a numerically-higher ratio, so the bike can be used at low speeds while keeping the engine RPMs up.
    ATGATT: All The Gear, All The Time!

    Current bike: Yamaha XT1200Z Super Tenere

    Put the phone away, put your helmet on, and ride!

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    Default Re: General SBK Discussion Thread


    While changing to a full system exhaust, is the re-mapping always/only towards higher power output? Can ECU re-maps be done for smoothing out the bike, better fuel efficiency with 'optimal' or if needed
    , 'lower' power output?

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    Default Re: General SBK Discussion Thread

    Quote Originally Posted by Andy_kristine View Post

    While changing to a full system exhaust, is the re-mapping always/only towards higher power output? Can ECU re-maps be done for smoothing out the bike, better fuel efficiency with 'optimal' or if needed
    , 'lower' power output?
    It's mainly done for smoothening out any lag in Power in stock or modded form. Bike runs right instead of too lean or or too rich.

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    Default Re: General SBK Discussion Thread

    Quote Originally Posted by Deathwing View Post
    It's mainly done for smoothening out any lag in Power in stock or modded form. Bike runs right instead of too lean or or too rich.
    Thanks for the reply, came as a suprise. I've been still wondering about this.

    So, by "mainly" done for higher power output. There is a chance for instances where the ECU remaps are done for lower power outputs too right?

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    Default Re: General SBK Discussion Thread

    Quote Originally Posted by Andy_kristine View Post
    Thanks for the reply, came as a suprise. I've been still wondering about this.

    So, by "mainly" done for higher power output. There is a chance for instances where the ECU remaps are done for lower power outputs too right?
    I by no means am an expert on this, but here are my 2 cents:
    Theoretically the answer to your questions is Yes.
    In simple terms let me define 3 states an engine can be in in terms AFR (Air/Fuel) tuning.
    1) Lean. More Power, Runs Hotter
    2) Optimal (Stoichometric ratio or 14:1 ratio air to fuel)
    3) Rich. Less Power. Runs Cooler.

    As you can see there is Pro and Con to being Rich or Lean tuned. The idea is during combustion, some un-burnt fuel touches the mechanical bits of the cylinder, exhaust port etc and being a liquid adds a cooling effect. Hence Richer mixture run cooler than Lean.

    Now, one would think that by default all bikes from the factory will be at the optimal ratio from the factory at all revs. This is not the case. Manufacturers tune their bikes to behave differently at different revs. Just as an example, on a street bike a manufacturer can tune a bike to be leaner at low revs for better response, but make it richer at higher revs to run it cooler. Such a bike will have comparatively lower peak power figure by an X% then the absolute best it can be. Now similarly a manufacturer going for peak numbers can tune a bike richer at lower revs to run cooler considering many bikes in city spend time in lower revs and go lean on higher revs for higher peak power knowing bikes dont spend much time at higher revs.

    It depends on the bike and the manufacturer and the application of the bike that decided how a bike is tuned through its rev range. While tuning ourselves, we can choose to modify the tune according to our application as well. For example for my track bike which will spend considerable amount of time at high revs, I might make it a bit richer at higher revs, at the cost of peak horse power.

    I hope this helps.

    Rachit
    Samarth 619 likes this.
    Rachit K Dogra

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    Default Re: General SBK Discussion Thread

    Guys i have a question, what if in middle of spiti valley near kunjun pass like your motorbikes fuel pump fails, then what to do?
    hshstar4182 likes this.

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    Default Re: General SBK Discussion Thread

    Quote Originally Posted by sameerxcx View Post
    Guys i have a question, what if in middle of spiti valley near kunjun pass like your motorbikes fuel pump fails, then what to do?
    Until and unless you can source the fuel pump and a mechanic, which isn't possible in spiti valley, you have to get your bike transported in a truck to the nearest service center.
    But normally super bikes have good quality parts and chances of failure are very less, only if the fuel is adulterated it may fail.
    hshstar4182 and sameerxcx like this.
    Peace

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