Post by
float_6969 »
https://forums.nicoclub.com/float-6969-u780.html
Tue May 20, 2008 8:08 pm
Call Garrett and ask them about ditching the water lines. Let us know what they say.
Actually don't bother, I'll save you the trouble because I've done this already.
What they'll tell you is that they are water cooled because of the reduced amount of oil flow the BB turbo's require. Due to the nature of the BB center section, they can't handle (nor do they need) the oil flow of a traditional journal bearing center section. They reduction in flow decreases the load on the engine oiling system, the amount of drain back needed, and further reduces the drag on the main shaft of the turbo, allowing for even further improved spool up and transient response. The down side is a lack of cooling, HENCE THE NEED FOR THE COOLANT PASSAGES!!!!!
Cliffnotes: Don't plug up your coolant lines unless you don't care about the longevity of your expensive BB turbo.