Take pipes / Intercooler out, use “petrol” to clean.

Flyboy
Any comments on the Garrett GT28 RS Disco Potato Turbo as a replacement for a CT26?

Potato is a great little replacement turbo, a lot better than the 26. Although they are not a direct fit replacement unit. You will have to change your intercooling pipework, that can be quite costly >$600 if having someone make / weld ally pipes for you.

Hmm...thought it would bolt right on
Is there a rebuild kit for my CT20b?
I'm going to have the motor fully rebuilt soon and I imagine the Turbo will need a refresh or a new one.

Hi Guys, I'm back on the turbo horse!  As per various suggestions I've had compression checked and pretty uniform and around 170psi.  Plugs were grey, dry, not oiled.   I've fitted a catch can as suggested earlier.  Still smoking so I'm back to turbo and bought a $1200 Mamba turbo rather than mess around with rebuild.  Came with a nice set of hoses.   Which leads to my question.  The wastegate actuator on my original CT26 has a pipe nipple on it which has a hose to a nipple early in the compressor snail path.   The Mamba turbo has this point blanked off and a nipple way at the end of the compressor snail, just between the "CT26" label and the outlet.  My Toyota CT26 didn't have any way to connect at this point but I noticed it seemed that the casting was thicker there, as if Toyota had allowed for this?   Should I run the actuator hose to the point that Mamba seem to intend or switch back to the Toyota pressure point earlier in the snail.  The forum doesn't easily allow me to add a pic, I don't know how to do this easily via URL, sorry.  I've tried to get Mamba to reply but no luck.
 

Thanks Tony.  And for the other suggestions.  I need to sort out the oil in exhaust before going to wideband sensor, my exhaust seemed to foul the last w/b sensor that I had fitted so I went back to std one.  I'm not even sure if it is working:-(