Thread: Turbo Busa

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    Turbo Busa
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    Okay, I am no expert on the subject, hoping to get some input, here is a little something I have heard, is it true?
    A friend of mine has a turbo car, Tom Pro, with a gen 1 Busa, he was telling me that the ECU has the stock tune and that all of the fuelling for the boost is done with the pressure adjusting fuel regulator, manifold pressure goes to the reference port on the regulator so that for each additional PSI boost the fuel pressure is increased by the same pressure.
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    Re: Turbo Busa
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    Millenium Member plkracer's Avatar
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    Depends on how much boost,

    Yes, this could be true with low boost, and no regards to adjusting your timing. Usually people run a custom map with the pressure regulator to get it a lot closer. You will need to tune sensitivity of the regulator as well, it isn't going to be pound for pound.

    There seem to be a lot of kits out there that get around 225hp without much hassle. Sounds like they are running 80-90 psi at the injectors at full boost, but didn't say what pressure that was at.
    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: Turbo Busa
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    Senior Member Akpilot's Avatar
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    Kuma

    Yes that is true you need to add fuel pressure as boost goes up but you also need add fuel with the injectors. I'm using a Power Commander to modify the stock fuel map, so when no boost your on the stock map but with each 1lb of boost you add fuel to the map.

    Ak
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    Re: Turbo Busa
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    I was under the impression that adding more pressure to the injectors was the same as adding more fuel flow. I guess as plk said not really enough and I hadn't given any thought to the timing issue. Guess if I do step up to turbo I'll be doing a lot more research.
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    Re: Turbo Busa
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    Not enough, flow will only go up by the root of the pressure change.
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    Re: Turbo Busa
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    The Wizard bdkw1's Avatar
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    You can get regulators that increase the pressure 2-1 or more, like up to 6-1 if your fuel pump will push it.
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    Re: Turbo Busa
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    Millenium Member plkracer's Avatar
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    Yeah, they have some that are pseudo adjustable, using a diaphragm and a bleed screw to get the right gain. A lot of kits aim for the square in pressure rise, 6lbs of air takes 36 lbs more fuel, etc.
    Last edited by plkracer; 08-01-2017 at 04:14 AM.
    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: Turbo Busa
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    so sounds to me after being on suzukihayabuse.org forum that you use a high pressure pump like a walbro, a 1:1 fuel regulator which does some compensation for boost and then a FMU, at 6:1 to get up in the 90 psi range, I imagine some mapping mods would also be needed maybe through the power commander as AK said.
    I believe at least on a gen 1 anything more than about 8 pounds of boost and you would need to get bigger injectors.
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    Re: Turbo Busa
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    Millenium Member Deranged's Avatar
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    Check these guys out. I have heard a lot of good feedback from their products.
    http://www.bazzaz.net/index.php/fuel...ntrol-overview

    Justin
    Nowhere near the desert.
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