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930targa 930targa is offline
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Join Date: Nov 2007
Posts: 14
how did you break the turbo?

from my expierence with non KKK turbos on these engines is that the drain that most people put on the catch tank that plumbs to the pass. side valve cover is because after shutdown there is still oil pressure on the system , while the turbo oil pump on the rear of the drivers side head is no longer rotating/doing its job . so the oil restrictor (granted that you have one) is making the pressure even higher ,while the turbo oil pump is shut off so you end up blowing the rear seal of the turbo and you get all this smoke upon start up .

also another thing is that if you use synthetic oil , cool downs are just a waste of gas , oil coking is almost eliminated with synthetic oils.

a t66 is a pretty large turbo , a gt counterpart for that size of turbo would be a gt4094r , but i would personally go with a precision gt4067 should spool pretty good on that size of an engine, and is intended to be oil cooled unlike the garrett gt BB turbos, which are designed to be water cooled. it is non BB but the newer design turbine and comressor wheels make the turbos more efficient .if money is not an issue, buy a turbonetics gt-k650 , ceramic ball bearing ,inconel turbine wheel , all types of good stuff.
Old 12-07-2007, 05:41 PM
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