Garrett GT2860R-5 Turbos just blew up

[curtisgoodman]

well it couldnt be temp because i rock a 9 row oil cooler and i run 10w40 royal purple oil... the car did sit for over a year before it was started due to the latest bunch of work i did... so i will agree that an accusump would help in any situation its just a great product... before we jump to conclusions we should wait till Herman rips them apart... see what he has to say then i'll fill you guys in on what happened...

[Skym]

Would be interesting to see what he says. Just I had a similar turbo failure and it was oil temp related (I gather dried up oil / coking blocking the oil ways).

A w40 is said to be good to around 120 degrees C and 9 row oil cooler is a bit small for the hp the engine is producing.

More boost = more heat and need the cooling system to match.

[AL91GTR]

Herman at Cherry bored out the oil drains on my N1's last year to promote better drainage and avoid coking ... he's the real deal and been rebuilding turbo's for a long time.

[Skym]

I know HKS modify their 25/30 turbo's using tricks of the trade (makes them unique, different to off the shelf Garrett turbo's which don't have those mods as standard). Most good turbo rebuilders know and use some of those tricks when rebuilding Garrett turbo's.

[curtisgoodman]

Turbos arrived yesterday morning so just waiting for a phone call.

[Bruizer]

Interesting. Is it possible you're pushing them too hard? They can't be rated to 30 psi. Can they?

Proper oil restrictors?

[curtisgoodman]

When installed I was told they had been installed with the proper oil restriction... now I'm not exactly sure what size restriction there needs to be and where said restrictor would be located... the oil lines are obviously aftermarket SS braided lines and where they connect to the block there is another piece in between the ss line and the Tee banjo bolt fitting on both sides... I have yet to take it apart but i did want to clean out all the lines and check everything... i have would guess it would be located there because I didnt see anything turbo side...

Also regarding boost pressures I think it was Kismetcaptain or a name similar on GTR.CO.UK that ran the same turbos at 30psi for quite some time with out issues (although he was running Toulene 50/50 mix with his fuel at the time if that matters), and if i remember correctly cause i havent looked at the turbo chart in a while 2bar was the peak of the efficiency, mostly blowin hot air after that... Im assuming the water meth helps a little in my situation aswell.

[curtisgoodman]

some info i found

http://www.gtr.co.uk/forum/119365-gt2860-5s-oil-restrictor.html

http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Product_Code=ATP-OIL-021&Category_Code=ATP-OIL1

[curtisgoodman]

so ripped off the banjo Tee bolt that feeds both turbos with oil and yes they were restricted with an extra bit before the stainless lines and on the rear side the restrictor was blocked... blocked by 3 little balls of thin small metal... kinda looked like a fine thin strip that had been rolled up on itself... i took some pics im looking for my phone cable to post the pics... but man am I choked... i'm assuming that the metal was from when i blew up my motor after the first rebuild... but who knows... it was post filter so it came from inside somewhere... going to do a compression test before i fire the car back up...

is there a way to blow out the oil system or do i just hook everything up but the turbo oil lines and unplug the fuel pump fuse and while im doing the compression test blow out a bunch of oil from the turbo feed port on the side of the block... just to see if there is anymore crap in there...

[curtisgoodman]

[curtisgoodman]

still havent heard from herman at cherry turbos... hes had my turbos for over a week now... I'll be giving him a call on monday to see whats going on... i paid extra to airmail them to him so i hope they're getting rebuilt...

[curtisgoodman]

Front turbo is fine rear turbo was starved of oil and failed... so the metal bits blocked the restrictor to the rear turbo

[DougTaylor]

I'm sorry to hear that, but thank you very much for taking the time to let us know what the problem was.

[curtisgoodman]

no problem play hard pay hard lol

[leung23c]

Where the metal bits come from? Since the oil pump supply oil to turbo does that mean the metal bits got thru the engine first then reach the turbo?