[Supras] 57 trim turbo with clipped turbine wheel

[berniek at technicaldevelop.com]

Pat:

    There is plenty of meat around the disc wastegate valve.  Boring the 
turbine body 1/8 inch increases the area considerably since area varies 
as the square of the diameter, but adds only 1/16" to the radius of the 
hole.  There remains about 1/8" of an annulus for wastegate valve 
turbine body to valve overlap.

       BernieK

Patrick Golder wrote:
> Hi Bernie,
>  
> I'll be looking forward to hearing how this works for you.  Clipping 
> the turbine wheel always seemed like a hack to me, and this sounds 
> like a much better solution.  
>  
> One question - how will you get the wastegate flap to close completely 
> if the opening is bored out?
>  
> Patrick
>
>     Date: Tue, 21 Aug 2007 19:27:55 -0400
>     From: "berniek at technicaldevelop.com"
>     Subject: Re: [Supras] 57 trim turbo with clipped turbine wheel
>     To: supr91tt at yahoo.com, "Supras at supras.com"
>     Message-ID: <46CB74FB.6060301 at technicaldevelop.com>
>     Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>     When I had my 57 trim done, it seemed reasonable to bore out the
>     waste
>     gate orifice 1/8" rather than having the turbine clipped. In that
>     way,
>     the exhaust gases could still exit, but boost would come in at a
>     lower
>     RPM. The engine with that turbo is being installed in the car now, so
>     we shall see.
>
>     BernieK
>
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