Ricky49 Posted June 16, 2011 Share Posted June 16, 2011 Regarding the ball Bearing option of a turbo is it worth paying the extra $700+ with what spool time you would gain over the same turbo but journal. Quote Link to comment Share on other sites More sharing options...
JamieP Posted June 16, 2011 Share Posted June 16, 2011 On a small/mid size turbo the gains wont make much difference imo, on a big turbo every little helps. If i was looking for a new turbo now i would look towards the batmowheel stuff, not much info yet but what has been about seems good. Quote Link to comment Share on other sites More sharing options...
imi Posted June 16, 2011 Share Posted June 16, 2011 i went for the T61 DBB option for the quicker spool (albeit on a t61 its an overkill) and extra cooling. Quote Link to comment Share on other sites More sharing options...
dude Posted June 17, 2011 Share Posted June 17, 2011 The wheel technology is prob more important for spool, I would not use a journal bearing now, new design is ceramic ball bearing which is handy as like my T6 there is no water cooling, check out Billet Turbo and Comp Turbo. If you want to know how much free'er a BB is my T6 spins for 21/2 mins after switching off with the motor on tickover. Quote Link to comment Share on other sites More sharing options...
Scott Posted June 17, 2011 Share Posted June 17, 2011 I'm definitely going for dbb. Not sure if it will make a great deal of difference but as said, every little helps. Unless trying to build a car on a budget I would always recommend dbb. I was looking at the batmo stuff but I really want dbb and as far as I know they aren't available yet? Quote Link to comment Share on other sites More sharing options...
Nic Posted June 17, 2011 Share Posted June 17, 2011 I would always go with a DBB turbo, as a percentage of the overall single conversion cost i believe the gains are worth the extra. If you were to drive a Supra: one with a journal bearing turbo, one with a DBB turbo of the same size back to back you would notice the difference in response. Quote Link to comment Share on other sites More sharing options...
Ian C Posted June 17, 2011 Share Posted June 17, 2011 DBB every time Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 17, 2011 Share Posted June 17, 2011 Ball bearing turbos are able to handle the thrust loads of a high boost turbine much better and much more safely than even a 360 degree thrust plate in a plain journal bearing turbo. I am not very convinced about improved spool, a journal bearing needs pressurised warm oil to spin properly, it would be interesting to see how long a plain bearing turbo sins for without exhaust flow, but WITH continued pressurised oil flow to its bearings. One snag with BB turbos is a bearing or shaft failure can allow tiny ball bearings to escape places where they are most definitely unwanted. Quote Link to comment Share on other sites More sharing options...
sdistc Posted June 17, 2011 Share Posted June 17, 2011 If you want to know how much free'er a BB is my T6 spins for 21/2 mins after switching off with the motor on tickover. As dude has said, my 42R spins for a couple of minutes after shutoff. It's cool Quote Link to comment Share on other sites More sharing options...
Ian C Posted June 17, 2011 Share Posted June 17, 2011 I am not very convinced about improved spool I did a back to back test between a T67 journal and a T67DBB turbo on my Supra a few years back, with datalogging and everything. The low down response is hugely improved with DBB. Numbers, graphs, and discussion here: http://www.mkivsupra.net/vbb/showthread.php?68090-Dual-ball-bearing-turbo When you are going for it and shifting above 4000rpm with bootfuls of throttle, it makes almost no difference. It's the low down stuff for street driveability that DBBs shine at. Most of us spend most of our time there, so it's certainly worth it. -Ian Quote Link to comment Share on other sites More sharing options...
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