Thread: Busa Datsun

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    Re: Busa Datsun
    #91
    Millenium Member Lug-Nuts's Avatar
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    Good to see your still working on this, and havent let it go by the wayside!
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    Re: Busa Datsun
    #92
    Senior Member Akpilot's Avatar
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    Last month start up.......

    https://www.youtube.com/watch?v=WW2cw-7AyIY

    I have a question. I replaced the inner torque limiter inner clutch (2011 Busa) with a billet clutch. It turns out that the billet clutch is designed for a lock up style clutch and the spring retaining arms are short causing the springs to coil bind. I can simply put spacers in there but now it's got me thinking of a lock up style clutch. Have any of you guys used the lock up clutch or is that just a drag racing application? With the added weight of the car and a turbo I'm thinking the clutch needs a little help especially on hard launches on pavement. Thoughts...

    Thanks
    Akpilot
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    Re: Busa Datsun
    #93
    The Bob Ross of MBN Bullnerd's Avatar
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    Congrats AK! Badass!

    That's not what I pictured the frame looking like but OK, I can see where your going.

    Watch That master switch! The big red paddle one. They are not made like the old school ones. I had one fail almost immediately in the Briggs. I ended up taking the new and old one apart and making one good one.

    I think I bought mine from Longacre? I had pics on here of the difference inside, I'll see if I can find them.

    EDIT: cant find the pics. If you start having electrical problems, look at that switch.
    Last edited by Bullnerd; 07-25-2017 at 03:27 PM.
    "Speed is time-time is speed"-Dennis Hopper

    Quote Originally Posted by TALON View Post
    did you use a special bigfoot camera or something ,you know all blurry could be a tree stump kinda thing .
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    Re: Busa Datsun
    #94
    Millenium Member Lug-Nuts's Avatar
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    Awesome!!!
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    Re: Busa Datsun
    #95
    Millenium Member plkracer's Avatar
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    Can you swap out the towers from the original setup? They are red loctited in, btw.

    No need for a lockup clutch on a stock or near stock motor, they are meant more for racing where you can adjust their slip, and make them grab at a certain rpm for consistent hits. I assume you are asking about a single stage.

    The busa clutch is pretty robust as is. I didn't bother to take the back torque limiter out since it only acts on engine braking, and the sand really slows the vehicle down, and I'm never in a situation where the engine is being forced to a high rpm.

    Oh, didn't see you were going to turbo it. Heavy springs may be enough in that case.
    Proud owner of a two seat pucker-mobile. Funco inspired mini buggy powered by a Busa. Giving out free rides to anyone brave enough.
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    Re: Busa Datsun
    #96
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    Billet basket and HD springs. Later yr Busa have a better basket already, but billet is still a good idea w turbo.
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    Re: Busa Datsun
    #97
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    I thought the Gen II Busa's don't turbo as well as the Gen I because of the higher compression?
    Awesome project as usual for Ak.
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    Re: Busa Datsun
    #98
    Millenium Member plkracer's Avatar
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    Properly built, either one will turbo just fine, but the gen 1 can take a few more pounds of boost with less octane.

    I've heard the gen 1 cases are a little beefier in some sections, and some of the guys pushing the limits go back to gen 1 cases with the gen 2 crank and head. Maybe it was just the cylinders....

    The gen 2 ecu is far more capable though. Addition of boost is easily accommodated without a fuel pressure regulator.

    I've seen 6lbs for a gen 1 and 4 lbs for a gen 2 before you need to open it up for mods. I would be careful with boost on a stock motor though, these heavy vehicles definitely tax the motor harder and longer than a bike.
    Proud owner of a two seat pucker-mobile. Funco inspired mini buggy powered by a Busa. Giving out free rides to anyone brave enough.
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    Re: Busa Datsun
    #99
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    I don't want to hijack this thread but do have a question on turbocharging, please see other thread
    Turbo Busa
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    Re: Busa Datsun
    Senior Member Akpilot's Avatar
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    https://www.youtube.com/watch?v=pX-fC4sMLac

    My son Tyler took a video and since he's much better than me (cell phone vids) so here it is. Hopefully I can put her in paint this winter.

    Well I had it on the road, not for long though I have bad vibration issues. With two drive lines they can clock differently in and out of the reverser, this means fight each other pretty bad depending on where they happen to land. Sometime is seems like they are coming apart at 30 and other times it not bad until 60. With the rear and front at different angles I don't think a double cardian U-joint CV will help either, I need to go to a true CV for the drive lines. I got in touch with the drive line shop in North Carolina who make expensive CV drive lines but have yet to hear back after I mapped out what I was dealing with. Maybe I just need to put in a non plunging CV at the reverser and adapt one to the engine output flange. Another problem I have is there is no cushion in the drive system and so she bangs pretty bad with each gear change. With a solid axle in the rear a Guibo is going to be hard to implement but I'll have to figure it out. Maybe even rubber mount the engine but that's just showing my age. It was pretty fun while it lasted. We only tuned to 2-3 lbs of boost because we kept popping the fuel pump fuse at about 8-9k RPM. The engine tuner is pushing to do engine mods this winter for more boost but we'll see, need to figure out this drive train first.

    Ak
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