2nd Blown Turbo in a short time

[mxer24]

hey all,

it all started gave my buddy my fp18g, i got a sweet deal on a pte60 trim. anyways, i blew that turbo. now i have a pte5031 and im pretty sure i blew that turbo as well. i just cannot figure out why. when i installed, i used a -4an stainless line from the filter housing, no restrictor because they are journal bearing, and a -10 line as a return line. there are no line kink's anywhere. with my latest turbo i blew, i was boosting 16lbs, with 880's with an afr of about 11-12 :1. i just wanna know why i blew again. i am running a maf-t in blow through, with a greddy rs venting to atmoshpere. i have no surge or anything. what gives?

 

[rEclipserGST]

Did you remove the balance shafts? What's your oil pressure sitting at? How do you know you blew the turbo? Shaft play? Black/white/blue smoke? Details help in diagnosing a problem.

 

[mxer24]

its a blue smoke. i know it is oil. i dont have an oil gauge, was next thing to get. but there is a lot of shaft play leading me to believe it is a blown turbo. i still can boost, unlike when i blew my other turbo. i have no oil in any of the intercooler piping what so ever. it just smokes liek a bi***. at first i was thinking valve seals, but then when i took time to look at it today, and felt the shaft play, it definately feels like a blown turbo. i just wanna know why, if i t is a blown turbo, did i go through 2 so quickly?

 

[rEclipserGST]

I'm going to say too high of oil pressure. Some turbo's come with a restrictor in the feeding line or at least a banjo bolt that is a restriction itself. What psi where you running? Do a quick search and see if your turbo requires a restriction of some sort. Jusmx can easily tell you if you need one. He is a turbo boss.

 

[JusMX141]

it all started gave my buddy my fp18g, i got a sweet deal on a pte60 trim.

Big mistake. Should've given HIM the PTE turbo and all of it's reliability issues and kept the FP 18G for yourself.

What gives? Garrett-based journal bearing turbos (especially those made by PTE) hate our cars.

 

[mxer24]

there has to be a reason why " they hate our cars". i wanna know that reason. not just, they hate our cars. i cannot figure this out for the life of me. i know journal bearing turbos do not need an oil restrictor, but it does soun dlike it was getting too much oil pressure. effing eh.

 

[AndrewD5418]

Big mistake. Should've given HIM the PTE turbo and all of it's reliability issues and kept the FP 18G for yourself.

What gives? Garrett-based journal bearing turbos (especially those made by PTE) hate our cars.

Not if you properly restrict oil pressure.

 

[mxer24]

Not if you properly restrict oil pressure.

but its not a ball bearing turbo? i thought only bb turbo's needed restrictors.

 

[HurleyTSi]

When you say shaft play did you move it up and down or in and out? Did the comp wheel hit the cover?

Some up and down is ok but if it moves in and out or you can hear the comp wheel touching its safe to say it's done for.

 

[RT-AWD]

but its not a ball bearing turbo? i thought only bb turbo's needed restrictors.

I would have to say thats wrong. My buddy blew 2 non-bb bullseye turbos within a few months on the 3rd one he put a restrictor on and its been fine ever since. i dont run one but i'm thinking maybe i should since they are cheap.

With our cars its pretty much better to be safe then sorry in every case.

 

[mxer24]

I would have to say thats wrong. My buddy blew 2 non-bb bullseye turbos within a few months on the 3rd one he put a restrictor on and its been fine ever since. i dont run one but i'm thinking maybe i should since they are cheap.

With our cars its pretty much better to be safe then sorry in every case.

i think its getting to be wrong as well. i just emailed precision for a direct answer.
i think if you are running the oil line from the filter housing it might be too muhc pressure without a restrictor. however, running it from the head's oil port, i think you might be fine.o well, the gvr4 is going to be jackstand ballin again...

the timing just sucks, just put this turbo in , tuned it up all nice, bout to buy an safc to compliment my maf-t and all my gauges are nice nice, good injectors. finally making some power than. boom.

o well its a dsm...gotta love it.

 

[JusMX141]

there has to be a reason why " they hate our cars". i wanna know that reason. not just, they hate our cars. i cannot figure this out for the life of me. i know journal bearing turbos do not need an oil restrictor, but it does soun dlike it was getting too much oil pressure. effing eh.

Here's your answer.

Garrett journal bearing turbos have larger internal oil passages than our factory Mitsu turbos. They require more oil volume and slightly higher pressure than what the head can provide on an unmodified engine, but less oil pressure than what the filter housing can provide on any car. The main reason for the poor reliability when fed from the filter housing is that all of the aftermarket companies insist the -10AN oil drains they sell for every Garrett turbo made will drain the added oil volume efficiently. Unfortunately, they're wrong.

More oil volume to the supply of the turbo will OBVIOUSLY need a larger oil drain, and the -10AN lines have a smaller inside diameter than even the stock oil drains that are designed for low-volume oil source coming from the head. If you want to run a Garrett unrestricted from the filter housing and not have issues with oil burning, you'll need to build a custom oil drain larger than anything available in the aftermarket.


The best oil source for one of these turbos is either a -3AN line from the filter housing unrestricted, or a -4AN line from the filter housing with a .075" restrictor. Some guys are having success feeding from the head, some aren't....you should only feed from the head if you've checked the oil pressure at the source and it's at least 25psi while cruising at low engine speeds.

But yes, there are more reliable turbo options....unfortunately, you gave one away to your buddy.

 

[Boost_Addict_88]

When you say shaft play did you move it up and down or in and out? Did the comp wheel hit the cover?

Some up and down is ok but if it moves in and out or you can hear the comp wheel touching its safe to say it's done for.

Sorry to threadjack, but isn't a little in/out shaftplay ok?

 

[JusMX141]

Sorry to threadjack, but isn't a little in/out shaftplay ok?

No. You want NO noticeable in/out play, and as little up/down play as possible. The slight up/down play is necessary as an oil tolerance- it should all but disappear once the turbo has been supplied with a pressurized oil source.

In/out play shows wear to the thrust plate, similar to the crank thrust bearing that fails on 7-bolts. Would you buy a 7-bolt 4G63 knowing it had a little in/out play and feel confident dropping it in your car?

 

[Boost_Addict_88]

True. Reason I asked is because I have gotten different answers on this subject, some saying in/out is ok and vise versa. Thanks for tha clearup!