Turbo Motor w/ Imco SC... shift issue
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Turbo Motor w/ Imco SC... shift issue

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    Senior Member HighVoltage329's Avatar
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    Default Turbo Motor w/ Imco SC... shift issue

    My little sleeper a 240 Hallett that I been running a Gentry draw thru twin turbo set up. Happy with the set up other than around the docks. If I lean the idle to make it idle smooth it dies when I shift with 1.25 gear & 30 pitch prop. So I've been running it fat at idle so it huns/rolls but I have to time my shifts. It's a bit of a pain and would like to make it more user friendly. Any Ideas?
    Last edited by HighVoltage329; 11-17-2011 at 02:44 PM.

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    Senior Member steveo143's Avatar
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    Efi!
    steveo143 AKA DiMarco 21 II



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    IMCO makes a shift interruptor kit that may help. I put one on mine and from 1100 RPM at idle it shifts into gear without the clunk you would typically have without it. It also comes out of gear much easier with the shift kit. Basically a micro switch kills the ignition momentarily just as it shifts into gear. Check IMCO's website.

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    Senior Member HighVoltage329's Avatar
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    I've been thinking EFI but was hopping for a cheaper easier solution. I think I will try the shift interrupter from IMCO. Thanks WETTE VETTE!!

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    Senior Member steveo143's Avatar
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    Quote Originally Posted by HighVoltage329 View Post
    I've been thinking EFI but was hopping for a cheaper easier solution. I think I will try the shift interrupter from IMCO. Thanks WETTE VETTE!!
    I agree! If it works as advertised, seems like a good solution!
    steveo143 AKA DiMarco 21 II



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    I have the same style system on my omc king cobra outdrive, it cuts out cylinders to drop the rpms when shifting out of neutral. Works great when everything is adjusted and tuned properly!
    Last edited by bbfsouthwind; 11-17-2011 at 07:34 PM.

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    Quote Originally Posted by steveo143 View Post
    I agree! If it works as advertised, seems like a good solution!
    It works pretty well. There are 4 DIP switches that determine how long the interrupt takes place so you can dial in what you need for a smooth shift. At 1100 RPM you can push the shifter forward / backward a small amount and the motor will stumble at which time you can put it in gear like a stocker. It's also common for a Bravo cone clutch to have some difficulty coming out of gear with a large wheel, tall gears and a higher than stock idle RPM so the interrupt is helpful there as well. I'm pretty happy with it as it allows my 2 X 1050 Domi tunnel ram motor to idle a little higher and still keep the drive happy on the shifts.

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    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by HighVoltage329 View Post
    My little sleeper a 240 Hallett that I been running a Gentry draw thru twin turbo set up. Happy with the set up other than around the docks. If I lean the idle to make it idle smooth it dies when I shift with 1.25 gear & 30 pitch prop. So I've been running it fat at idle so it huns/rolls but I have to time my shifts. It's a bit of a pain and would like to make it more user friendly. Any Ideas?
    Does it die when the idle is tuned lean, and you start it in gear?
    Quote Originally Posted by Nice Pair View Post
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    Senior Member HighVoltage329's Avatar
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    Quote Originally Posted by Budweiser View Post
    Does it die when the idle is tuned lean, and you start it in gear?
    I don't start it in gear. I'm still running a neutral safety switch and not wanting to get rid of it. I don't want take a chance of hurting someone.

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    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by HighVoltage329 View Post
    I don't start it in gear. I'm still running a neutral safety switch and not wanting to get rid of it. I don't want take a chance of hurting someone.
    Do you get the feeling it's the shock of shifting that kills it or that it just won't maintain an idle in gear at all?

    If it wont maintain an idle at all while in gear, the shift interrupter wont solve the problem you're having with a lean idle.

    However, tuned rich, where it currently works, a shift interrupter should make shifting easier.

    I would try setting the idle mixture in gear while tied up and see if that changes anything.

    Good luck!

    -Seth-
    Quote Originally Posted by Nice Pair View Post
    Little kids play hooky .... big kids play "HOOKIE"

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    Senior Member HighVoltage329's Avatar
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    Quote Originally Posted by Budweiser View Post
    Do you get the feeling it's the shock of shifting that kills it or that it just won't maintain an idle in gear at all?

    If it wont maintain an idle at all while in gear, the shift interrupter wont solve the problem you're having with a lean idle.

    However, tuned rich, where it currently works, a shift interrupter should make shifting easier.

    I would try setting the idle mixture in gear while tied up and see if that changes anything.

    Good luck!

    -Seth-
    Sounds like it's worth a try...Thanks Seth

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