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Thread: Motocorasaro o2 optimiser - The improved FatDuc alternative.

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  1. #1
    apriliaforum expert MARTCO78's Avatar
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    Thumbs up Motocorsaro o2 optimiser - The improved UK FatDuc alternative.

    Motocorsaro o2 optimiser

    Clint_Fister was kind enough to let me test out his first production prototype of his UK alternative to the FatDuc for the Shiver/Dorsoduro this week. It's basically a FatDuc copy with longer longer combined tails for more sensible positioning, plus proper weatherproofing for the UK climate.

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    Installation

    Fitting was easy but quite fiddly, mainly because of where it is and it's difficult to see what you are doing without the benefit of a workshop lift. (Though it is perfectly possible lying on your back in a car-park, as I did)

    The marked up photo above indicates my routing and adjuster position, the notes below covering my installation pointers:


    1. There is no real vertical passageway that is big enough behind the frame at 'B' so the trimpot has to come almost outside the frame at 'A' (only just fits through) and then back behind at 'C'. However, it's all covered by the rubber drain pipe, so not visible.
    2. From that point on it slips up behind all the existing frame, harnessing and pipes and comes to rest hidden in the position shown. It could go a little higher, but it was well hidden from the elements and not against engine metal so I left it there. It will be easy enough to pull out for adjustment by tugging on the length visible above the oil filler.
    3. I only used one cable-tie in the position shown, just to keep the bottom end tucked in close behind the footrest hanger. Everything else is held in place by existing components is well away from exhaust elements and swing-arm movement.


    The optimiser is well weatherproofed, but the trimpot adjuster opening is still a potential point of water ingress, so I covered it with electrical tape to be double sure prior to installation.

    Testing Impressions

    My intial test run was my usual 12 mile central London rush-hour commute from Fulham to Muswell Hill. My riding style is a bit point-and-shoot, honed over 30 years of London traffic (https://www.youtube.com/watch?v=ZVJqLz88V5M) so may vary from other riders' normal environments and riding style. My Shiver also runs Arrow cans and a 15Tfront sprocket, both of which have already helped to smooth out a little the stock machine's low speed fueling issues.
    The run was conducted in Sport mode throughout.

    Start-up was completely as usual with no dash warnings showing.

    The most immediatly apparent difference for my style of riding in London is the loss of that really (no, really) sharp edge to the throttle response - it's all a little softer (and therefore better for everyday use) below 4000rpm and even at revs above that it has lost just a little touch of it's raw immediacy. It feels to me possibly a tiny bit flatter in the middle, but picks up noticeably after about 7000rpm and revs out fine as before. Having a little kink in what was previously a pretty linear power curve I quite like.

    The second element that became more apparent as the journey progressed was the much better manners on a closed to semi-closed throttle - its now very linear right down to the 1500 rpm tick-over level and I find my self fanning the clutch much less and much later to get round the little surges that the ECU inflicts in an effort to stop the engine dying at lower revs at walking pace speeds (I do a lot of that). Engine braking at slow speeds seems a little reduced, but that is largely due now to the lack of snatching as the revs die back to tickover.

    The best thing though is the throttle transition at lower revs - it's now really almost as smooth as a four and it will pull without snatch from much lower revs. Mid corner throttle changes are now better all round as the lurching that can upset the less than compliant stock suspension has all but gone...... so not only does it improve engine manners, the handling gets a boost too.

    There was only ever a hint of issues for constant speed cruising previously for me and that was largely due to the over-sensitive throttle response in Sport mode which could be tiresome on bumpy London road surfaces. That has now been eliminated.

    I left the Optimiser on Clint's default setting and the main pops on the overrun have gone, but it can still be encouraged to give the odd little hic under the right circumstances. I'm guessing to eliminate that entirely I would have to go a tad richer, but I would rather go the other way for a touch more edge on the throttle. (Clint suggests that richening removes the popping completely, but leads to a progressive softening of the throttle responce). I intend to live with the current settings for a couple of weeks and then experiment with varying the trimpot setting.

    The possibilty of improved MPG looks promising as I generally run late 30's in the dry and up to a max of 42 in the rain and snow. I filled up the morning of fitting and was fairly liberal with the throttle in the dry conditions - 12 miles without and 12 miles with the optimiser and it was already showing 41mpg. We shall see how it settles-in over a few tanks before being able to establish a reasonable level of improvement.

    So all good from my side - I have found initially the difference subtle rather than dramatic, refined rather than revised. It's a bit like an 'Optimised' map as it's taken the best elements from Sport and Tour and combined them.

    Also with the benfit of better fuel consumption it will pay for itself....what's not to like?

    Excellent work Clint and thanks for letting me have the first one.
    Last edited by MARTCO78; 03-22-2013 at 04:32 AM.


  2. #2
    apriliaforum Junkie razteo's Avatar
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    Good write, thank you. Although is very tempting, I love the rawness of my DD Sport mode!

  3. #3
    apriliaforum expert Mardoch's Avatar
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    Very well written. Seems like Clint did a perfectly fine mimicking job on the FatDuc whilst eliminating some of the asspain of the fitting/placement. Cheers, Clint!
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  4. #4
    apriliaforum Member Mark Kp's Avatar
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    Nice one Clint. ;-)
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  5. #5
    apriliaforum Junkie
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    Thanks for that. So what does it do to T mode ?

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    apriliaforum expert MARTCO78's Avatar
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    Quote Originally Posted by CdnSL View Post
    Thanks for that. So what does it do to T mode ?
    Smoother than a very smoooth thing.

    Tour mode as we know is basically Sport mode with a bit of elastic attached between the throttle and engine. With the optimiser that bit of elastic is a little bit older, but it does give a mode which would be perfect for riding as a presidential outrider in a slow-moving parade or for taking a very leisurly and relaxed ride through a scenic environment with a very nervous pillion.

    No use at all for me then.......


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    Quote Originally Posted by MARTCO78 View Post
    Smoother than a very smoooth thing.

    Tour mode as we know is basically Sport mode with a bit of elastic attached between the throttle and engine. With the optimiser that bit of elastic is a little bit older, but it does give a mode which would be perfect for riding as a presidential outrider in a slow-moving parade or for taking a very leisurly and relaxed ride through a scenic environment with a very nervous pillion.

    No use at all for me then.......
    I agree. But then I would, wouldn't I?

    In my own personal experience, even after having the latest dealer re-map, I could only tolerate T mode. S mode was like a light switch at low & medium throttle openings. S mode, though entertaining in a straight line, is realistically unusable if you want to retain any fine throttle control and stability through turns.
    However, after Optimiser, you'll never use T mode again... Ever.
    Last edited by Motocorsaro3; 03-22-2013 at 05:19 PM.

  8. #8
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    Thanks for the write up, hopefully I'll have one on my bike soon! One added benefit is there is nothing better than a new knob to play with.

  9. #9
    apriliaforum Member Wrighty90's Avatar
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    Superb write up, is Clint looking at selling some? If so, how much?
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  10. #10
    apriliaforum expert MARTCO78's Avatar
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    Quote Originally Posted by Wrighty90 View Post
    Superb write up, is Clint looking at selling some? If so, how much?
    As far as I know the last plan is that it's £55 including postage and the intention is to get some into production after the start of this thread, but PM him direct for more.


  11. #11
    apriliaforum Junkie
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    Great write up, and good news.

  12. #12
    apriliaforum expert tez180's Avatar
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    Sell me one Clint me olde mucka.
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  13. #13
    apriliaforum newb Double.D's Avatar
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    Quote Originally Posted by tez180 View Post
    Sell me one Clint me olde mucka.
    Count me in mate aswel

  14. #14
    apriliaforum prov-nov normannumeric's Avatar
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    I'm in! Sounds fantastic. Keep us posted please Clint...

  15. #15
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    Yep, I want one , please let us know when its ready!

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