Upgraded CT26 Info

[Doward]

SHHHHHHH!! How dare ye say that!

Trim is an indication of the relationship of the inducer to the exducer. I will say that just saying omg TRIM! by itself is worthless. You need to know the size of either the inducer, or exducer. The 'trim' of the wheel will adjust the characteristics of flow.

Look at the 57 trim, 60 trim, and 60-1 wheels (which is a 62 trim)

Being that they all have the same exact size exducer (2.95") - it is the inducer that is changed on all 3 wheels, giving you more flow as you go up in 'trim'

The 57 trim has the smallest inducer, then the 60, then the 62. It's an indicator of the size difference between the inducer and exducer, that's all

 

[Boostedstr8six]

Yes the BB program is up and running. It is designed to make the turbo last longer. We currently are working on making a ct26 that does not use a thrust washer, but rather the BB controls the thrust.

Could you get into more detail on the bearings you use? I was reading through a trade journal a few weeks ago and the cover article was on developing more efficient bearings for high speed and high precision machining. I gathered that ball bearings struggle at high speeds due to "skidding" and the heat generated by that. Turbos are definitely a major challenge for ball bearings with the very high speeds and temperatures. There's also the issue of sharing engine oil which might get too dirty for high speed ball bearings. IMO, ball bearings would have a tendency to have a shorter service life in turbos than fluid bearings, all external variables being equal.

Also, using ball bearings to control both radial and axial loading would require some kind of compromise either with "dual mode" bearings that can control radial and axial loads BUT sacrifice performance in both areas. The other option would be the use of separate types, both radial and axial. I think using bearings designed for radial loads only and a 360 degree thrust bearing would be better than just ball bearings.

Just trying to gain a better understanding. :icon_bigg