over oiling a Ball bearing

[464/2K]

a friend of mine has a Fp 3052 and we are wondering if the turbo is toast or what is up. every shift feels like your starting in 1st having to fully respool the turbo. the guy who had it on his car was feeding it from the oil filter housing with no restriction and it had a pretty beefy line.

did the oil pressure kill the bearings on the turbo? or is it just an effect of the turbo getting over oiled?

any help would be appreciated thanks in advance.

 

Must be burnt up inside the cartridge it sounds like.

Have you turned it by hand? What does it feel like?
If its anything like your spool up issue, probably not too smooth.

Too much oil pressure is the likely problem. Thats why you have an oil restrictor fitting to go into the oil inlet of a GT turbo. They generally like no more than 45psi.

 

[464/2K]

its really smooth but you could hear the bearings, once we put some oil there was no sound or anything.

 

[Rausch]

IIRC there should be no play in it at all. maybe carbon build up on the bearing surfaces??? i believe that right around 30 psi is optimal for BB units. but i believe they have a restrictor built for just that. /ubbthreads/images/graemlins/dunno.gif

 

[JSchleim18]

Yeah the GT turbo's should be run with a restrictor and from the head...not the filter housing!

 

[CP]

Everything from the previous two posts is what I've heard.

 

Well, now that thats been established...

Your option for a solution?

GT centers are not easily rebuilt, or at least not economically

 

[boostedinaz]

Send it back to FP and suck it up.

 

[Hksvr4]

is there blue smoke on de-celeration through the tail pipe? Shaft play up, down, and side to side more than usual? Boost leaks? Wastegate not closing? Put a restrictor on it, then see what happens.

 

[BadVr4]

you shouldn't need a restrictor if you run the feed from the head, running it off the head is a restrictor

 

[Rausch]

^^ there can potentially be less pressure from the head, but there still needs to be some type of additional restriction in the feed (usually at the turbo itself) to the housing. i believe that some of the BB units have a restrictor built into the inlet bearing housing.

 

[slugsgomoo]

Quote:
you shouldn't need a restrictor if you run the feed from the head, running it off the head is a restrictor



not enough of one, which is why fp sells a filter/restrictor piece that's pretty cheap, and i think they give you a better warranty if you run it. /ubbthreads/images/graemlins/dunno.gif

I was under the impression that once you toast the bearings & whatnot on a GT series turbo, the center section was toast. /ubbthreads/images/graemlins/confused.gif

 

[Bimmubishi]

It could be something wrong with the motor or the tune. It's not likely that over oiling would cause spool to be noticeably slow.

 

[tpr103]

i had a friend who had a bb mutt turbo. he ran his off the filter and had nothing but problems. he sent the turbo back 4 times finally the asked how his oil inlet was routed. bb turbo need restriction! if you by brand x turbo, buy brand x oil feed!

 

[RayH]

Is he running a manual boost controller and is there a bleed hole between the boost controller and wastegate? If there isn't that would explain the poor spool between shifts; without the bleed hole the wastegate is held open by the trapped air in the line.

 

[bazeng]

FROM TEAM4G parts database:
I just thought I'd share this information with those with GT turbo's

For those who are running one, oil pressures must remain low. To ensure this if you are running the oil feed from the head, you must run a .125" restrictor (3mm)..... If you are running the oil feed from the oil filter housing, you will require a .8mm restrictor....

Have the restrictor as close to the turbo as possible!
a -4 line is usually used for the feed...

This info is only based on the 4g63..
Info sourced from dsmtalk, provided by forced performance...

Based on the oil pressures generated by the 4g63 which are
25psi @ idle
75psi @ 5000rpm
up to 100-110 psi at cold start and 7000rpm...

NOTE: Balance shaft removal will increase oil pressures

If you do not restrict the turbo feed, it will leak past the seals and you will burn oil out the exhaust....


------------------------

FP database:
GT CHRA Ball bearing applications:

The body of the filter features a built in .8mm restrictor as recommended by Garrett for use with their GT25R, GT30R, GT35R cartridges. Garrett has recommended oil pressure specified for the oil inlet of the GT CHRA. The idle oil pressure at the turbo should be 9psi and oil pressure at 5000rpm should be 30psi. The .8mm restrictor will reduce an engine with 25psi oil pressure at idle, 75psi oil pressure at 5000rpm to these Garrett recommended pressures.

4G63 Specific info:

When using the FP4ANFilter on an oil supply line that originates at the filter housing on the 4G63 engine, the .8mm restrictor results in the Garrett recommened pressure at the turbocharger oil inlet. For 4G63 engines that feed the turbo oil off the cylinder head, the .8mm restrictor should be drilled out to .125”. The normal 4G63 engine has low enough oil pressure at the head oil supply port that the .8mm orifice is not required. The filter element provides all the restriction needed to get the oil inlet pressure down to the Garrett recommended values.


---------------
More info:


---------------
My restrictor i made with a grub screw that screwed into the oil fitting before the turbo



---------------

also make sure your oil drain is not restricted also, this is a big cause of turbo failures with honda's i've played with which were blowing blue smoke (turbo seals)
once the drains were modified to a larger size, they blue smoke went away!

(picture of mine)




-----------------

And from what I am aware of, a little shaft play is normal

have you looked at other parts of the motor? such as the blow off valve?
could it be sticking open as you shift causing the lag?

good luck!

 

[mistaVR4]

I'm getting ready to slap a BB turbo on my car and here is a pic of the modded feed bolt for the head (see much smaller feed hole) I'm also going to run the FP 10 micron in-line filter on the feed line.

 

[JSchleim18]

When i purchased my GT turbo from PTE...they supplied a restrictor fitting right on the turbo...also use an inline fuel filter on that same line...GT's don't like dirty oil

 

[bazeng]

MRVR4,
the only problem i see with the banjo bolt restrictor on the head is that it will take a much longer time for the oil to get to the turbo....

what do you think?

 

[mistaVR4]

I haven't heard that, but logically that makes sense. Has anyone heard anything bad about using a banjo like this vs. a restrictor right at the turbo?