Brand new Garrett T28bb expired, less than 10,000km.. why?!

[~SlideWays~]

This was on a 4agze with Link and professional tune.

Went to Manfeild yesterday, third run of the day and lost boost. Pulled into the pits checked hoses and all looked fine. Started car again then had white smoke (or water vapour) pouring out of the exhaust.

Trailered home.

Today I did a compression test and it is low in 3 & 4. It has always been a perfect 150psi on all but now 3 & 4 is down to 120. Lots of air coming out with the oil filler cap off. Interesting note, the wiring cover which runs across the end of the cam covers has melted!?

Took the turbo off and it has lots of play, this was a brand new Garrett item when put on and has done less than 10,000km and never over 13psi.

I have no idea what has happened to the turbo.

Compression is probably the head gasket but I suppose it could be the rings.


$&#$% sake this is going to expensive.

[~SlideWays~]

Oh and also the external waste gate which is a Tial copy...the head/top can be turned...Im sure it never did this before.

Could this have been part of the problem? Can't think of how.


ANy suggestions on a replacement turbo would be great. Looks like I might have to change the exhaust manifold too.


The word "cnut" comes to mind.

[beeker]

How many kms had the engine done ? Assume stock 4agze, and not rebuilt stronger.

I'm very interested !! as im considering a similar upgrade for mine.

[~SlideWays~]

How many kms had the engine done ? Assume stock 4agze, and not rebuilt stronger.

I'm very interested !! as im considering a similar upgrade for mine.

170km's but has been rebuilt in the passed.

Don't know if the headgasket is anything special, probably stock. Standard internals.

Im most concerned about the very expensive turbo which died for no obvious reason.

[bluemaumau]

you had a boost gauge?

[matt dunn]

did you have a boost limiter set in the link?

On the newer versions if you set the limiter above the internal map sensor capabilities such as 266kpa it will not cut.

Good oil feed and drain to the turbo?

Matt

[Diesel PWR]

sounds like you had a major boost leak and turbo was working overtime, possibly wastegate diaphram

[flygt4]

did u notice it was running lower boost before it stopped boosting at all gav?

maybe yours did the same as mine , and had a boost leak and spun the turbo a wee bit fast. possibly from the wastegate?
my first indication was that i was only getting 0.7 instead of 1bar , and when i got into the pits after my 2nd session i could hear the comp wheel clipping against the side of the housing under gentle throttle.

[~SlideWays~]

Its seemed to get to 13psi fine.

Yep, had a boost cut set with the link and also had a boost gauge. It never over boosted at all.

Yep, made sure the oil drain had a good angle on it.

It is possible that there was a leak and the turbo was working too hard.

Did not sound like it was working hard. Dyno boost plot graphs from a few weeks ago look fine.

Would it have been noticable if it was over reving to make the 13psi? Only thing that is suspect is the external which seems to have had a leak but looked more like it was on the plum back pipe (to the dump pipe).

Son of a bitch, cant rebuild it either cos its ball bearing.

I really need to find the problem else it'll kill another turbo.

[ezy10s]

when you get your new turbo on there replace the oil feed line- oil contamination is a really common problem with killing turbos.

[NZ_AE86]

possible oil starvation?

[matt dunn]

when you get your new turbo on there replace the oil feed line- oil contamination is a really common problem with killing turbos.

Here's what I do every time i refit or replace a turbo.

I remove the rubber part of the oil drain hose.
Put a drain tray under it.
Start and idle the car untill there is a flow of oil coming out of the drain hose.
Then refit the hose.

That way I am 100% sure that the turbo is getting oil through it.

Matt

[~SlideWays~]

when you get your new turbo on there replace the oil feed line- oil contamination is a really common problem with killing turbos.

Its a braided hose so I'd think just taking it off and flushing it would work?

Nick, yeah I took the oil feed off and put the end into a jar, after about 10seconds it filled the jar with oil so oil starvation couldn't have been a problem.

I'm thinking it could have been a problem with the external wastegate. Would like to get it tested but how is the question.

[IH8TEC]

when you get your new turbo on there replace the oil feed line- oil contamination is a really common problem with killing turbos.

Here's what I do every time i refit or replace a turbo.

I remove the rubber part of the oil drain hose.
Put a drain tray under it.
Start and idle the car untill there is a flow of oil coming out of the drain hose.
Then refit the hose.

That way I am 100% sure that the turbo is getting oil through it.

Matt

note to self


oil starvation might not be a problem at idle, but when your pulling shit loads of revs constantly, that was the first thing that came to my might, but you say it's got really hot? what internals were you running? enough fuel on a dyno run adn enough fuel on a circuit could be two completely different things

[~SlideWays~]

when you get your new turbo on there replace the oil feed line- oil contamination is a really common problem with killing turbos.

Here's what I do every time i refit or replace a turbo.

I remove the rubber part of the oil drain hose.
Put a drain tray under it.
Start and idle the car untill there is a flow of oil coming out of the drain hose.
Then refit the hose.

That way I am 100% sure that the turbo is getting oil through it.

Matt

note to self


oil starvation might not be a problem at idle, but when your pulling sh*t loads of revs constantly, that was the first thing that came to my might, but you say it's got really hot? what internals were you running? enough fuel on a dyno run adn enough fuel on a circuit could be two completely different things

Yeah its weird, it never went passed half way on the temp gauge but some how melted part of the wiring cover

Standard 4agze internals.

I was getting flames out of the exhaust down the straight so its definitely got enough fuel for this amount of boost.

[IH8TEC]

hmm, melted piston? i hate sayign that (knock on wood), but when i did mine, the temp guage never went really hot either, sounds like what happened with me anyway, stopped then started again and lots of white smoke,

was your motor rebuilt before hand? still shouldn't have if you were runnign such low boost with a proper tune.

[~SlideWays~]

hmm, melted piston? i hate sayign that (knock on wood), but when i did mine, the temp guage never went really hot either, sounds like what happened with me anyway, stopped then started again and lots of white smoke,

was your motor rebuilt before hand? still shouldn't have if you were runnign such low boost with a proper tune.

I bloody hope not!

Guess I'll find out once I've got the head off ay.

Well I guess I better get the ae86 going again else I'll have no car

Hey are you on msn messenger atm?

[~SlideWays~]

Could anyone please confirm as to whether a Garrett Ball Bearing Turbo infact can't be rebuilt?

There is some joker on trademe who claims they can do it but the ad isn't very professional.

[QikStarlie]

can be rebuilt but not as cheap and easly as normal turbo.

seals can be replaced. but you need a whole new bearing cartridge if the bearings are gone $$$. the seals for them arent cheap either

how much play does it actualy have? spin freely and wheels not hitting the housngs? the cartridge floats in oil and can seem like they have alot of play. i thought mine was near rooted awhile back, till i found this out

[IH8TEC]

are the bb ones more likely to stuff out if any metal filings (ie pistons on the off chance it is that) than plain bearing ones? because mine has a fair bit of play atm and the rear seal is gone, bu still driveable, plain bearings in my t3,