Dyno tune

Discussion in 'Tech Talk' started by Graham, Jul 29, 2019.

  1. Graham
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    Graham Member

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    Question for the tech guys.
    What is the difference between having the M109r dyno tuned with a pc5 and having it done without pc5?
    Also what does a servo buddy and x-tre do for the bike?
  2. ottafish
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    ottafish Member

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    Here's my understanding Graham...

    A x-tre will basically trick the ecu into thinking the bike is in 4th gear or above. What it does then is use a single timing curve for all the gears, (4th gear timing).
    Suzuki in the wisdom, retard and restrict the timing in the lower gears. This often shows up as jerkiness and surging at low-med throttle opening.
    It will be most obvious at slow speed in the first couple gears: as in u-turn, round-abouts, that type of stuff. So the x-tre gives you a constant, smooth timing map table and helping to remove the jerkiness.

    A servo-buddy, is basically a plug in unit to replace the servo motor on the exhaust. The factory exhaust has valves, (flaps or vanes) in the pipes to control back pressure and limit noise for emissions. With an aftermarket exhaust, the servo motor is normally removed, (or left on mith a dummy cam) and a servo eliminator is plugged into the loom in place of the servo motor. It's to make sure the ecu doesn't throw a code.

    A tune with a pcV vs a ecu only is really up to the individual and the tuner. Some tuners like the pc5, others like tuning thru the ecu.
    The other thing to be aware of is that a ecu can be "flashed" to remove a lot of factory restrictions and also remove the timing retard as per the x-tre, thereby eliminating the need to buy one, control over the secondary throttle plate opening rates, cooling fan on at a cooler temp, etc.. But not necessarily tuned as such. That can be done after the initial flash to set it up.


    Options for the pcV are available, such as add on modules you can get: additional injector controller, timing controller, quick shifter, dual maps, etc.
    The pcV will sit between the ecu and the injectors and intercept the signal and add or subtract fuel injector timing and pulse width to suit the conditions during the dyno tune based on what you're chasing: power, economy, smoothnes...
    I am a fan of finding a great tuner and doing as much as possible through the ecu. If your tuner can get access to the fuel and timing maps in the ecu, it can often have better granular control over a pcV, (not sure on the M109R though if it's a 16bit or 32bit ecu)

    But again, it's up to your tuner with what he/she feels comfortable with. So, find a good tuner and ask what they prefer to tune, then go from there.
    Last edited: Jul 30, 2019
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  3. Hulk
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    Hulk Supporter Member

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    good write up Otta
  4. Graham
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    Graham Member

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    Thanks ottafish.
    So in summary to put it simply.
    If I find a good tuner that can do all the tuning through the ecu, then there is no need to instal the pc5, x-tre and servo buddy?
    Is my understanding correct?
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  5. Tiger Dave
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    Tiger Dave Member

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    Yes
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  6. Paul henderson
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    Paul henderson Member

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    hi.
    makesure the head temp is the same as the oil temp.
    or you could get a false reading.