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Thread: Buell XB12Rsc e85

  1. #1
    Senior Member
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    Hello from Finland...

    Starting this thread if i could get some advices from this forum also. And I apologize in advance for my bad english..

    Bought my buell last year and it was all lovely to drive and so on. Little underpowered to wheelie and burn rubber at higher speeds, so i had to think something to fix it...



    First I bought eaton m62 from Nissan. That thing was way too big for my needs. It Felt like putting an elefant on top of Nissan Micra. Donno really why i bought it, maybe I was drunk.. Next i did some calculations and ended up buying eaton m45 from mercedes 1.8L, which was way better for my NEEDS!:


    With eaton m45 I'm getting 0.7 bar(10.15 psi) @ ~9000 rpm. I could spin it to max 14000 rpm, but roots type chargers produce so much heat even with 0.7 bar boost, that I should come up with some serious intercooling system. Intercoolers need space, serious intercoolers needs serious space, and thats one of what I dont have much...

    Space:
    Spacerockets use kerosin, so I decided to use it on my Buell too.... wait, what?!
    Seriously, space that I need for chargers plenum and everything else neccessary, is very limited with supercharger!
    I have had enough problems to fit large enough plenum between charger and throttlebody. Due to H-D's one pin sollution, the front cylinder(coming just right after rear) is getting only air/boost filling what's "left" of. I needed to make large enough plenum to give both cylinders the same air/boost filling. Ended up around 2-2.2L plenum.

    Final edition of the plenum:



    O2 sensor/sensors:
    I'm currently bothering my head with O2 sensor/sensors. Should i:
    -keep narrowband O2
    -disable narrowband O2
    -change narrowband O2 to wideband O2
    -keep narrowband O2 and add dual wideband O2 with AFR gauge, then manually adjust fuelmaps.

    Injectors:
    Just swapped original injectors to Deka 4 680cc injectors.

    At 330 kPa i should get fuel rate around 710cc. That should be just enough with 168hp(crank) + SC + e85 on injectors max duty cycle @ 89. Mabye I'l have to invest on EBR's 450 kPa regulator...

    At this point I'm waiting my primary cover/crank axle supporting bearing seal duckface cake system to finish.

    Some high accurate free hand design from it:



    GM 3 bar MAP-sensor configuration:








  2. #2
    Senior Member
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    Glad to see some pics of your project! Some questions:

    1. Will you mount the motor rigid to the chassis? If not, what design do you have to support the weight and loads of the supercharger up top? The charger needs to vibrate with the motor to maintain belt alignment and tension.

    2. Are you keeping the stock fuel pressure regulator setup? You may want to consider swapping to an external FPR that references boost pressure so you are not having to fight the reduction in fuel delivery on boost.

    3. Is the drive system coming off of the threaded part of the crankshaft? Will you have a splined drive to handle the load or just relying on the threaded interface?

  3. #3
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    And, use dual widebands to tune the fuel maps, then install the stock narrowband and be done with it!

  4. #4
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    1. Good point! Havent thought motor vibrations so much lately... I've welded four flanges to the chassis to support plenum-charger. I could put rubber washers to give some vibration to the charger, or do custom motor mount brackets from solid steel or aluminium, and vibrate along with it. hmm.. Wish I could see how Lazareth's done it...

    2. Havent decided it fully yet. First I was going for the EBR's 450 kPa regulator. Then started thinking of trying XBs original 338 kPa regulator, but today started to consider external regulator too.... Actually I just read some of your regulator topic from 2006.

    3. Relying on the threaded interfaces. Axle is not at it's last edition, cause at this edition it is a bit hard to remove after it selftightens it self to the primary sprocket. Going to shorten it and machine few surfaces on the fat side. That axle was a big help when measuring beltpulleys distance from the frame.

  5. #5
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    You may want to do some thinking about mounting the engine rigid to the chassis. The stock chassis mounting points may not put up with the additional stress from the undamped vibration of the motor. I would look into building structural bracing from the motor to support the supercharger assembly and the belt tensioner.

    Using the threaded interface may turn into lots of problems for your setup. Have you considered machining a drive shaft to bolt to the outside face of the front primary sprocket? You could retain the factory sprocket nut. The driveshaft would be supported by your outboard bearing just the same as your current design.

  6. #6
    Senior Member BuellyBagger's Avatar
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    Sweet project mrNICEGUY!!! You've got to have some serious balls to even embark on such a build!! And EricZ is a great guy to listen to, I'm pretty sure he's the only person on the forum to be as crazy as you ;) and hes also a very talented guy :D

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  8. #8
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    EricZ:

    Hmmm... I could use that rear cylinders mount bracket to support plenum/charger at least.

    I've been thinking using that front primary sprocket. Theres not much space between front pimary sprocket and primary cover though, so I'd have to machine more stuff off from inside the cover. Dont no yet how much there is left to take off, but soon i will..

    I could just use that threaded shaft to jig it on its place. Attaching a big "washer" on the front sprocket inside the shaft and weld it all together... Big risk that the axle would go off center because of the welding though...


    One think i have to consider too, is how I will manage off boost-on boost controlling. For now, I'm going for two BOV. 1 that works on vacuum, and lets all boost out when shutting the throttle. 2 that is just limiting the boost. Cant do both with just one BOV. Problem is that when i open the throttle with no load, it gives 0.7 bar boost immediately and revs like hell even with a tiny throttle opening.

    Talked with one guy who had the same problem, he said that city driving was "really intrerresting".
    "3% throttle openings with no load resulted revving the engine to ~7000rpm with 1.7 bar boost...."

    Thinking of a boost controlled waste gate option to that...

  9. #9
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    Very cool idea here.. can't wait to see it complete

  10. #10
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    BTW.

    This is how one guy sorted that boost problem out. He has 1360cc Suzuki with a same supercharger that i'm using. He welded an old BMWs throttle body before actual throttle body, and it's letting boost to the atmosphere linearly when shutting throttle down:



    Link to his SCREAMER-project page:
    http://forum.bomber.fi/viewtopic.php?f=24&t=70828



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