So I Pulled the Turbos Off...
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So I Pulled the Turbos Off...

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    Senior Member n8dawg's Avatar
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    Default So I Pulled the Turbos Off...

    Boat ran like crap all weekend.
    Symtoms:
    Could hardly get boat on plane because everytime I would give it gas the boost would kick in right away. Boost used to not go past 7lbs. Now goes past 10-15lbs. Motor was missing and popping out the exhaust when this would happen. Backed off and babied it all weekend.
    Talked with alot of people who really tried to narrow it down for me and I appriecate (sp) it. I didn't want to push it. After all, you guys were there to relax.
    The motor checked out, compression test 160 -172, checked the valve train, everything good there, changed the plugs, ran 108 octane mixed with 91.
    There was one question that I kept asking people about. My hose off of the carb to the turbo was really soft and pinched. I kept asking if pieces of the hose could be coming off inside and clogging the fan blades. Everyone said probably not.
    Well I got home and the first thing I pulled off was the turbo hose. Noticed about a quarter size piece of rubber stuck to the fan blade. Along with a little tiny pin size hole in the hose.
    Well look for yourself.
    Drivers side:

    Passenger side:

    Hose after removal:

    chunk of hose that was stuck to fan blades:

    passenger side. No wear:


    Now are the fan blades supposed to spin freely at this point?
    When I removed the turbo the fan stopped spinning, but when I clamp them back down they spin freely again. Is this normal? And should I open the cases on the turbos to make sure there isnt anything else inside there?
    Any help for a nube to turbos would be great!
    Thanks in advance.

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    Senior Member n8dawg's Avatar
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    I am also in need of a bracket to help support the carb basket to the motor/bellhousing. Right now its suspended just by the hoses. Any body make something like that?
    Thanks
    Nate

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by n8dawg View Post
    When I removed the turbo the fan stopped spinning, but when I clamp them back down they spin freely again. Is this normal? And should I open the cases on the turbos to make sure there isnt anything else inside there?
    Any help for a nube to turbos would be great!
    Thanks in advance.

    Yes, the Rajays need to be clamped down to the housing to spin freely, check for excessive side and end play in the shaft and you are good to go.

    If you look back to the PM I sent you on 8/10, I did state that you needed to check condition of the purosil hose and replace if necessary.

    Those old Banks systems all let the carb be supported by the hose, I think you will find that you are fine without a support if you just replace the hose.

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    Senior Member n8dawg's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    Yes, the Rajays need to be clamped down to the housing to spin freely, check for excessive side and end play in the shaft and you are good to go.

    If you look back to the PM I sent you on 8/10, I did state that you needed to check condition of the purosil hose and replace if necessary.

    Those old Banks systems all let the carb be supported by the hose, I think you will find that you are fine without a support if you just replace the hose.
    Barry,
    I remember you saying that. Kicking myself now for being lazy but working 16-18 hour nights doesn't free up alot of time for tearing stuff down. Do I check the shaft with the turbos off or bolted on?
    New hoses, re-adjust valves, new plugs, oil change, and re packing the driveline are on my list while I have it torn apart. Shooting for Labor day weekend to finally put a gps on it at the river and see what I have.
    Thanks!
    Nate

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by n8dawg View Post
    Barry,
    I remember you saying that. Kicking myself now for being lazy but working 16-18 hour nights doesn't free up alot of time for tearing stuff down. Do I check the shaft with the turbos off or bolted on?
    New hoses, re-adjust valves, new plugs, oil change, and re packing the driveline are on my list while I have it torn apart. Shooting for Labor day weekend to finally put a gps on it at the river and see what I have.
    Thanks!
    Nate

    Nate

    Yep,, with it clamped together, grab the end of the shaft see what it feels like. Also look for any obvious signs of problem, such as the impeller hitting the housing.

    While you are in there, measure the size of the bypass hole in the exhaust housing just for future reference if you decide you need more or less boost.

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    Driver 78CoLeBBF's Avatar
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    sounds like your talking to the right guy nate get that thing dailed see you labor day at the drags

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    senior member turbo wog's Avatar
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    Default nate

    i just rebuilt my rajay turbos. a real pain in the ass trying to find parts. i did find a aviation place that sells the stuff still. some parts are o.k on price some are expensive. p.m. me if you need parts if you can't fnd any.where are the drags at this labor day?

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    Senior Member n8dawg's Avatar
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    It might be time to run waste gates! Boost still wants to go above 10lbs. I would like to see where it stops but anything above 7lbs and motor starts popping out the exhaust.
    Maybe more fuel? Pressure is at 7psi. With a 850 DP.
    I'd rather go waste gates so that I dont have to run race gas.
    pretty bummed at this point.

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    Nate

    While you are in there, measure the size of the bypass hole in the exhaust housing just for future reference if you decide you need more or less boost.
    What size is the bypass?

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    Senior Member n8dawg's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    What size is the bypass?
    5/8 approx.

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    Senior Member Mcintyrelocal's Avatar
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    Do you have a fuel pressure gage? if so can you see it while running? It sounds like the same thing im fighting with my blown boat, and at the cp regatta i noticed that my fuel presure was all over the place then the pump just quit. Probably not what your problem is but mine had the same backfire at rpm and it was just running out of fuel.You also do need a waist gate because as soon as you get that thing running ill bet you will see at least 20 lbs of boost and if so i hope you have a good bottom end.

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