[Supras] 57 trim turbo with clipped turbine wheel

[Dan Gyoba]

On 22 Aug 2007 at 17:50, berniek at technicaldevelop.com wrote:

> 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

Well, that's the square of the radius, not the diameter, which is different, but it's still a 
logarithmic function, which is, I think your point.

Persoanlly, I think that getting rid of that huge blockage after the wastegate in the turbo elbow is 
probably more beneficial, and probablhy adequate.  Boring the wastegate opening certainly isn't 
useless though, and is a good idea.

Dan Gyoba
'89 NA 451,732 kms, Turbo swap COMPLETE
http://www.abstractconsulting.com/~dan