Roadrunner

The turbo diesel engine in my car has had an aftermarket ball bearing turbo installed, the original turbo had the standard brass bearings floating on oil, my question is how much should I reduce the oil supply to this ball bearing turbo? I have no figures for the standard turbo's oil supply pressure and flow. How would the oil supply to the turbo be restricted, and where would I put in a re stricter to slow the flow/pressure?

rohmer

a garrett ball bearing turbo likes to see around 40-45 psi. just to give you an idea.

busa4

most ball bearing turbo applications use a 0.035-0.040" restrictor orifice in the feed.

Roadrunner

Thanks for the replies, I will hunt around for a restrictor !

rohmer

put the restrictor as close to the turbo as possible. this makes it easier to check.
+1 on a .035 restrictor.. should do the trick.

Roadrunner

I'm not up to date with turbo lingo...what does "+1 on a .035 restrictor " mean exactly?

ek4

think the + 1 would be him agreeing with the restrictor idea and the .035 the size

rohmer

exactly. also note: that restrictors have also been called "pills" so don't be confused. you can usually put a restrictor the point where the oil line connects up to to the turbo. do this instead of putting the restrictor at the point where the oil line leaves the engine block. hope that clears things up a bit.

Roadrunner

Thanks a heap! virtual beers for all!!

ghettoturbo

...might want to talk to the turbo manufacturer before you do anything. Some already have a restrictor built in and cutting oil flow more could cause damage.

-Jay