[Supras] 57 trim CT26 alteration

[Dan Gyoba]

On 10 Dec 2007 at 22:11, berniek at technicaldevelop.com wrote:

>  From what I understand, the customary way to allow more exhaust flow
> through a CT26 is to clip the turbine wheel.  I discussed this with
> Performance Techniques when I had one modified for 57 trim.  To cut to
> the chase, I decided on boring out the wastegate passage instead, as
> the cross sectional area can almost be doubled while still leaving at
> least .080" at the circumference for sealing by the disk. 

I gotta agree with Jeff, too.

As I understand it, this isn't going to help make more power, but it would reduce the possibility of boost 
creep.  A 57 trim upgrade to the CT26 is what I'm considering as well, so I've looked into it.

Because of the increase in lag associated with clipping the exhaust turbine, I didn't want to go that way 
myself.  I would rather have the boost come on sooner for a broader power band at the expense of a bit of 
top end power.

Dan Gyoba
'89 NA 456,600 kms, Turbo swap COMPLETE
http://www.abstractconsulting.com/~dan