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Not Happy w/Dyno

Discussion in 'Motorcycle Tech Talk' started by BONECOLLECTOR, Jun 13, 2008.

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  1. Lucifer

    Lucifer Well-Known Member

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    :devil: Seems like you didn't need a dyno to dial in the bike...would be a hoot to watch ya doin it tho... Why did you sign the waiver and let them strap it on??

    I have well over 100,000 miles on mine, would I strap it to a dyno and let some guy wind it to the stops... Not a Chance!!! But I do like speed cruising... I do use the stretch of hiway here where in the early '70's they used to have midnight drags to run,kill,coast and check plugs to try to dial in midrange and top end.

    We kinda changed the subject of this thread,but as you can see from Bone Collector's experience not all dyno operators know how to use the equipment
    Last edited: Jun 23, 2008
    Lucifer, Jun 23, 2008
    #41
  3. hotroadking

    hotroadking Super Moderator Staff Member

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    One word, lawsuit, some guy/gal has a part break, perhaps a weak point, old part, or just coincedence, so they grab Joe Lawyer who sends a nasty letter and threatens to take them to court, Dyno guy hires his lawyer, buncha letters, judge, regardless of ruling Dyno guy has to spend a couple of grand to defend himself from worthless claim.

    So Hold Harmless, you know it's going to be run hard out, and dyno guy knows it's going to be run, if you put it on you agree to it and it's your problem whatever breaks.


    Dynos are just tools to help tune, I use a Daytona Twin Tech Twin scan, screw the o2 sensors into the bungs on the headers, go out and ride, it records the AFR at all positions on EFI bikes, Then I set the values up properly and new targets on EFI.

    Similar to run and chop and read plugs but a little more advanced.

    Thing is, unleaded makes plug reading all but impossible unless you're a pro like Nascar or some major engine builder with the proper tools.
    hotroadking, Jun 24, 2008
    #42
  4. Art_NJr

    Art_NJr New Member

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    "Roll-on" testing

    As much as I like the dyno, with a highly-skilled operator & the air/fuel ratio "sniffer" attachment, it does not take into consideration real world factors including road conditions, weight & especially aerodynamics. For example, a Road King with the big windshield will accelerate the drum on the dyno in high gear faster than the bike will accellerate out on the highway in high gear. But some "roll-on" tests you can do yourself will tell you what you want to know.

    Pick a nice stretch of road where you can nail the throttle (preferably in high gear) @ one point & let the engine pull to a 2nd point. How long did it take to get from point A to point B, or say you started @ 50 mph, how fast were you going when you got to point B? Any misfire, stumble or hesitation? Make whatever adjustments you think are necessary & do it again. And again. And again. Try to duplicate the conditions as much as you can & keep doing it until you're satisfied that's the best the bike is going to run.

    Every time we've gone to the track we went to the dyno 1st & especially when going from very high humidity @ about 500' above sea level to almost no humidity @ about 4500' above sea level, the dyno got us really close. But time slips don't lie & further adjustments always picked up a little more. We're not dealing with 10ths of a mph on the street/road, but the same thing still applies - the dyno is a tool which can help you get the right air/fuel mixture, ignition timing & so on, but "roll-on" testing will tell you what you want to know for the conditions you actually ride in.
    Art_NJr, Jun 24, 2008
    #43
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