JBS & Hunterworks sheave testing tuned by Dynojet with Power Vision
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JBS & Hunterworks sheave testing tuned by Dynojet with Power Vision

This is a discussion on JBS & Hunterworks sheave testing tuned by Dynojet with Power Vision within the X2/X4 CVT, Sheaves & Wet Clutch forums, part of the Yamaha Wolverine X2 & X4 847cc SxS category; Finally got around to installing the JBS extreme sheave Version 2 and tuned by Dynojet locally at headquarters. I will be testing both sheaves and ...

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Thread: JBS & Hunterworks sheave testing tuned by Dynojet with Power Vision

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    Puddle Jumper InfidelMT's Avatar
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    JBS & Hunterworks sheave testing tuned by Dynojet with Power Vision

    Finally got around to installing the JBS extreme sheave Version 2 and tuned by Dynojet locally at headquarters. I will be testing both sheaves and reporting results from both. The YXZ and my X2 are the first to be tuned by Dynojet.

    Initial conditions:
    1. JBS extreme sheave version 2 with 18 gram weights with shim installed.
    2. Hard pack dirt road.
    3. 10 PSI in all 4 tires 27x10x14 which are not light at 38lbs each.
    4. >4000ft elevation.
    5. ECU tuned by Dynojet locally with Power Vision.
    6. Full cab and windshield.
    7. Top speed 64mph

    My first impression of the JBS sheave. The bottom end through mid range is wicked fast. Pulls very very strong. Low range and mid the RPM's are noticeably higher then stock just cruising around at low mph. Not a big deal but it is somewhat louder. I think I could have easily pulled a few more MPH airing my tires up to 18psi and fine tuning it at Dynojet on the Dyno. So I'm guessing top end of 66-67mph could be attainable very easily.

    Now that it is installed I will take it back to Dynojet have them run it on the Dyno and fine tune to post final results. I have purchased a Hunterworks sheave as well with 20 gram weights and will be doing the exact same testing and will post the results of both. I'm not biased to either JBS or Hunterworks. Both make an outstanding sheave which is way better then stock. It all is going to depend on my riding still which sheave I end up with.

    Just some of the features of Dynojet's Power Vision. Coming soon.. It is not released yet to the general public.

    Speed limiter is gone

    Fan activation is 10 degrees cooler

    Injector pulse width is kept through the range

    All monitoring of everything on the Yamaha BUS (injector pulse width, RPM, Vehicle speed, accelerator position, throttle position, ignition timing, coolant temp, air temp, intake air pressure and gear (H,L, N and R).)

    Full ignition and fuel maps through the whole rev and speed range (can also set a target air fuel ratio based on stock wide band O2 sensor in the exhaust for these tables)

    Rev limit increased by 500 RPM

    O2 sensor monitoring

    Drive by wire mapping through whole rev and speed range

    All of these are user configurable too through power vision. RPM, Speed Air fuel ratio, fan engagement temps, etc. All plug and play. This is going to be a game changer with the ability of fine tuning our X2/X4's. Dynojet has and will be the leaders in tuning when it comes to powersports. Wide band with O2 will also be available in the near future with autotune.

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    LJ3, DWRAT, 4snowandrally and 5 others like this.
    2019 Wolverine X2 Camo R-Spec
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    JBS & Hunterworks sheave testing inprogress
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  2. #2
    Belt Smoker DWRAT's Avatar
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    Great post.
    Sounds like 18-gram weights and 27" tires are not a good match.
    I personally run 20 gram with 29" tires and cruising rpm is nice.
    2019 X2 SE Black
    29x9-14 all around.

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    Puddle Jumper InfidelMT's Avatar
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    Quote Originally Posted by DWRAT View Post
    Great post.
    Sounds like 18-gram weights and 27" tires are not a good match.
    I personally run 20 gram with 29" tires and cruising rpm is nice.
    Yeah I am sure if I would have used 20gram with my tires would have been lower RPM's and little higher top end. Pulls very hard and roasts the tires on gravel off the bottom end to mid range. I will test both sheaves and decide which one better suits my riding style. Once testing is done I will have a sheave for sale with little to no miles on it.

    64mph still wasn't bad with my setup and conditions...
    2019 Wolverine X2 Camo R-Spec
    1st Wolverine X2 ECU Tuned by Dynojet with Power Vision
    JBS & Hunterworks sheave testing inprogress
    MSA M25 Wheels with EFX 8ply 27x10x14 Motoclaw
    SuperATV 1.5" Rear Wheel Spacer
    Pro Vantage 3500 Warn Winch
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    Rear Cargo Box
    Adventure Pro Magellan
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    Jegs 28K BTU in Cab Heater
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    Belt Smoker DWRAT's Avatar
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    20's won't help top end at all, just lower the shift swing.
    Top speed isn't changed by weights.
    Hunterworks likes this.
    2019 X2 SE Black
    29x9-14 all around.

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    Puddle Jumper InfidelMT's Avatar
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    It will lower my RPM's which I want and by airing up my tires to 18 psi all the way around and tuning it on the dyno I will increase top end as well. I fully see 66-68mph happening. Not like I'll ever drive it that fast. But nice knowing I have it.
    1slo_CR likes this.
    2019 Wolverine X2 Camo R-Spec
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    JBS & Hunterworks sheave testing inprogress
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    I am very excited to see the power vision with auto tune is coming!!!! Looking forward to seeing your results on the sheave.
    InfidelMT likes this.
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    Slow Poke 1slo_CR's Avatar
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    Quote Originally Posted by InfidelMT View Post
    I will test both sheaves and decide which one better suits my riding style. Once testing is done I will have a sheave for sale with little to no miles on it.
    PM me when you're ready to sell that sheave and weights. I'm interested
    '20 X2 XT-R

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    Puddle Jumper InfidelMT's Avatar
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    Quote Originally Posted by 1slo_CR View Post
    PM me when you're ready to sell that sheave and weights. I'm interested
    Sounds good. You'll have to pick up a Dynojet Power Vision for it as well when released soon. It will be tuned to either Sheave.
    1slo_CR likes this.
    2019 Wolverine X2 Camo R-Spec
    1st Wolverine X2 ECU Tuned by Dynojet with Power Vision
    JBS & Hunterworks sheave testing inprogress
    MSA M25 Wheels with EFX 8ply 27x10x14 Motoclaw
    SuperATV 1.5" Rear Wheel Spacer
    Pro Vantage 3500 Warn Winch
    Super ATV 72" Plow
    Rear Cargo Box
    Adventure Pro Magellan
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    Shoulder bolster deleted
    Jegs 28K BTU in Cab Heater
    Side by Side Enclosures full Cab
    Amsoil Synthetics Throughout

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    Hog Chaser
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    Quote Originally Posted by InfidelMT View Post
    It will be tuned to either Sheave.
    Are you saying engine tune (fuel mapping) needs to be changed when installing a machined sheave on the X2?
    2017 Yamaha WOLVERINE R-SPEC EPS SE
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    Puddle Jumper InfidelMT's Avatar
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    Quote Originally Posted by FiremanDan View Post
    Are you saying engine tune (fuel mapping) needs to be changed when installing a machined sheave on the X2?
    It's more for the rev limit be raised and speed limiter for the ECU for the sheaves. If you want simplification then PV is the way to go. User defined parameters which offers a whole lot more features. However if you have an aftermarket exhaust, big tires, etc.. then yes it would have a different tune. If you want to dial it in that's what I would do. The tune that gets done may be just fine for both sheaves. We won't know until we get into testing them on the dyno. It's plug and play anyway and your not having to remove your ECU and send it off.
    Last edited by InfidelMT; 11-12-2019 at 02:00 PM.
    2019 Wolverine X2 Camo R-Spec
    1st Wolverine X2 ECU Tuned by Dynojet with Power Vision
    JBS & Hunterworks sheave testing inprogress
    MSA M25 Wheels with EFX 8ply 27x10x14 Motoclaw
    SuperATV 1.5" Rear Wheel Spacer
    Pro Vantage 3500 Warn Winch
    Super ATV 72" Plow
    Rear Cargo Box
    Adventure Pro Magellan
    Super ATV Flip Windshield & Half Windshield
    Shoulder bolster deleted
    Jegs 28K BTU in Cab Heater
    Side by Side Enclosures full Cab
    Amsoil Synthetics Throughout

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