[Guest]

Why do ball bearing turbos have lower lag? Presumably this is due to lower bearing friction. But why??

With turbos whizzing round at 150000rpm |PLS| i would have thought that the standard bearing of shafts in floating oil would have less friction than a ball baering race. Or is it the thrust bearing that is replaced by balls????

 

[Guest]

Oli,
In BB turbos, the whole sleeved centre housing is replaced with 2 ball bearings housed in fully floating cartridges.
You can also do away with the thrust bearing because you have a tight clearance between the bearing surface and the shaft and so bb turbos can take a lot more thrust load.

Andy

 

[Guest]

Nice anim...no overlap though

 

[Guest]

Mr thicky has just realised it's direct injection (MAN system for you techies ), still no overlap though

 

[Guest]

Andy,
Where did you get that animation ?

 

[Guest]

I have a Roller Bearing Ti-Turbo on my and it cuts in about 1500rpm
I was told that it has lower bearing friction as well, when I turn my car
off you can still hear the turbo spinning for well over a minute!!!
Cool noise!


Tony

 

[Guest]

Tony, what turbo u got then?

 

[Guest]

Duffman,

It's an E6 RS Titanium Roller Bearing Turbo, a Hybrid made for Rallying!
It was recommended by Dragon who did the High Torque 400bhp conversion on
my carYumYum.
It kicks in so smoothly and instantly with no lag at all

Tony

 

[Guest]

HH6, Darwin etc...
Animation is to be found here

Well done to HH6 for spotting that it is direct injection as well...

Andy

 

[Guest]

thanks all.

They sound so good presumably the reason we don't all have them is cost?

I don't suppose there is much advatnge for racing as spool up is not so important if you are always flat out?

 

[Guest]

Oli,
http://www.essexturbochargers.co.uk will do you a ball bearing replacement for your mitsi turbo.

I know that Mr. Legend spoke to them and got some details but I can't remember the price off the top of my head.

Andy