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Thread: 900cc VS 750cc on dyno

  1. #1
    Honest always, feared often Micah / AF1 Racing's Avatar
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    900cc VS 750cc on dyno

    Here are the basic dead stock dyno runs of the 900cc vs 750cc 90 degree v-twin motors from the Shiver/Dorso. Do not get hung up on low looking numbers, our dyno reads about 15% lower than what you will see on a DynoJet dyno, this is quite simply RAW bhp and torque at the rear tire corrected only for atmospheric conditions, no BS fluff factor like powertrain or driveline loss etc. The awesome news is that the gains are well in excess of what was initially claimed by Aprilia/Piaggio from the extra 150cc of cylinder displacement.

    The Dorso used for baseline testing made some pretty photogenic pics during it's break in time a few weeks prior to doing full power runs. The red hot pipes are totally normal in extended cruise power type running, with air injection filling exhaust with fresh air to burn off any remaining unburnt fuel from combustion chambers and working with the catalyzer to clean up tail pipe emissions. Makes for neat looking pics so I figured I would shoot a few and share them.

    Long story short the new 900cc motor is well up on power compared to the 750cc unit replaces, it responds well from very low rpm which is nice on the street and pulls to the top of the rev range eagerly!
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    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  2. #2
    apriliaforum expert redratbike's Avatar
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    that's quite a jump..and good news ...love the glowing exhaust
    please get in touch if you would like a modded collector,adjustable lock-stops or quick release tank and seat pins

  3. #3
    apriliaforum expert
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    Nice graphs - thanks.

    How is the AFR doing ?
    Any area that can be improved ?
    Dorsoduro 900

  4. #4
    Honest always, feared often Micah / AF1 Racing's Avatar
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    There is ZERO point in trying to measure af/r on a new demo bike with air injection active...simply erroneous data. As time goes on I will explore a little deeper into this, it will require some more work than I have time for ATM like adding a couple of header bungs for widebands and killing off air injection to see where we are really starting at.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  5. #5
    apriliaforum expert Frodo's Avatar
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    Thanks Micah
    Surprised by the jump in torque and power!
    I'm happy with my 750 Shiver (other spending priorities....), but that extra grunt would be nice!
    Frodo
    2015 Shiver
    New Zealand

  6. #6
    apriliaforum expert Hellgate's Avatar
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    Impressive


    How's the dyno room compare to the old one?

    Sent from my SAMSUNG-SM-G900A using Tapatalk
    Pete

  7. #7
    apriliaforum Junkie
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    Nice little bump there. Micah, you can speak to this but is it just the design of the engine and the cams that hold these things back? I look at the Ducati Streetfighter 848 which I would guess puts down 110 or so on your dyno (120ish on a Dyno Jet) and really wish that these could at least split the difference. The ducati 939s are doing 100ish on most dynos so still a bit more then these bikes... I just wish Aprilia had a stop gap bike between the Shiver/Dorso and the Tuono. I would really love a 465lb, 115hp, naked...

  8. #8
    apriliaforum expert rule62's Avatar
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    I'd like to know about the cam lift and duration on the 900's. If they're better, could they be dropped into the 750 heads for some sought after gains?

    Sent from my HTC6500LVW using Tapatalk
    2014 DD 750 ABS - Spark exhaust, Arrow decat, headers (all ceramic coated), BMC filter, FatDuc, BikeMaster DLFP16-BS LiFePO battery, GPR steering damper, DD 1200 fully adjustable rear shock w/spring swap, 2016 Tuono Factory wheels, 15/44 520 conversion (PBR/Superlite/DID), Strada-7 fork preload adjusters, Samco 2-piece hose kit w/clamps, Engine Ice, Renazco Racing seat, EvoTech tidy tail, Aprilia grab handles, shorty levers, crank-case breather mod, evap-can delete... and a Rapid Bike EVO on order...

  9. #9
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Interesting question on valves and heads, I have not had any reason to take one apart, apparently the change was in stroke only between the 750 and 900 so there could be some differences.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  10. #10
    apriliaforum expert rule62's Avatar
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    Well... if you happen to find a reason to tear into one (AF1 race Shiver project from a while back, hint) please keep us posted.

    Sent from my HTC6500LVW using Tapatalk
    2014 DD 750 ABS - Spark exhaust, Arrow decat, headers (all ceramic coated), BMC filter, FatDuc, BikeMaster DLFP16-BS LiFePO battery, GPR steering damper, DD 1200 fully adjustable rear shock w/spring swap, 2016 Tuono Factory wheels, 15/44 520 conversion (PBR/Superlite/DID), Strada-7 fork preload adjusters, Samco 2-piece hose kit w/clamps, Engine Ice, Renazco Racing seat, EvoTech tidy tail, Aprilia grab handles, shorty levers, crank-case breather mod, evap-can delete... and a Rapid Bike EVO on order...

  11. #11
    apriliaforum prov-nov ExMXer's Avatar
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    I would like to know what the mileage is on both bikes.

    To what mileage does the computer restrict output during break-in?

  12. #12
    apriliaforum Junkie
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    Quote Originally Posted by ExMXer View Post
    I would like to know what the mileage is on both bikes.

    To what mileage does the computer restrict output during break-in?
    To my knowledge the ECU does not restrict power at all during break in. The manual states you should take it easy but I think you still get the full power.

    With that said, most guys who race, work on, run lots of bikes don't really follow break-in instructions from what I have seen.

    The typical method seems to be:
    -Run them hard but not to full rpm, think 3/4 throttle to 3/4 rpm for the first couple hundred miles
    -Don't maintain steady rpm, lots of accel/decel to load the rings
    -Change the oil/filter after 25-50mi and again at 500-1000mi
    -Use non-synthetic for the first 1000 miles then switch over to syn.
    Last edited by Colorado S14; 11-02-2017 at 03:16 PM.

  13. #13
    Honest always, feared often Micah / AF1 Racing's Avatar
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    I saw zero computer restriction on either bike, both were AF1 demo bikes, both had several hundred street miles at time of dyno testing, will add 1200cc into mix...also dead stock demo bike on first mapping option as I ran before and after loading Arrow race mapping and stock 1200cc mapping was terrible here in USA "as -delivered". These dyno runs obviously only reflect full throttle where the mappings of all test bikes were in an acceptable af/r range, neither drowning rich nor scary lean.

    The 1200cc Motor truly towers above the 750 and 900cc versions lol.
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    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  14. #14
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Just an FYI, every motor sold before ever being installed into a car, boat, airplane, motorcycle or scooter has been run to full power on a motor dyno to make sure it is fundamentally "good". My basic break rules are only this, ride it like you are going to ride it, vary rpms and MAKE DAMN SURE IT IS FULLY UP TO OPERATIONAL TEMP BEFORE BEATING ON IT. That last part is REALLY important no matter whether a motor is old or new. The only parts really "breaking in" on modern engines are the piston rings and since they are pushed out towards the cylinder walls by combustion pressure, getting on a motor is good for it during break in, at least up to peak torque rpm. I have never had a properly built "new" or "rebuild" motor fail on the dyno and many people get machines modified and tuned before even taking delivery.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  15. #15
    apriliaforum expert drvacation's Avatar
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    WORD! Been building trick Motors for years,let it warm up and ride it like you stole it. No blow ups, no oil burnersSeen a lot of people burning oil say I broke it in per factory instructions

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