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The mkiv Supra Owners Club

Turbo talk and 2012 history rows.?


herbiemercman

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I just enjoyed reading an old thread on which turbo should we trust? I am lucky i can buy the best or the cheapest, but based on FFP, (fit for purpose) i have the XS T 70, performance is great, but i only do 2k/anum, so it will take a few years before i can give an opinion,i hope?, on it's longevity, however i would be grateful if any members can update me on the current reliability situation on XS cheap turbos. ?

The "Doctor", who i have great confidence in for his "bottle", and experience, and guts to try new things, to help members who have a limited budget.

 

The main thing for me is, how many turbine blades have entered the engine and caused obviouse destruction? In my engineering mind, it is the exhaust turbine which is exposed to high temperature stresses, and failure here will shed particles down the exhaust pipe, not into the engine. I will bow to better judgement on this, but to me the air intake side has a much easier life.

I am not trying to start "world war three" on this subject and over he past 12 months i have got the gist of the divide between the "Doctor" and some other members, members on each side of the divide have helped me, so i am technical and not political. Any information will be appreciated. Herbie.

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I understand the logic of the turbos. Make no mistake though, they're pretty crap compared to what can be bought nowadays. However, I completely agree that if you can meet your power goals, drive-ability requirements and don't need replaced every other year then they're a good shout.

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If there is damage to the intake compressor wheel, shards of metal can be forced round into the head of the engine. If your oil feed/drain lines malfunction then you could have oil pressure issues which can damage the turbo but also engine if unlucky

 

those would be my main two concerns with a cheaper turbo

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Thank you for comments guys, but i still would like to know what the "worst case scenario" is for failure? and if, and how, the engine can get damaged. Herbie.

 

If the bearing gets severely damaged shards will go into the oil return.

If the compressor gets severely damaged shards will go in the inatake.

If the exhaust wheel gets severely damaged shards may end up in the exhaust side of the head.

 

Worst case scenaro your entire engine is scrap along with the turbo. There's also the potential to make the intercooler useless as well.

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I had a set of hybrids let go and emptied the bits of compressor out my intercooler, I doubt with a single turbo that catastrophic fails the bits of compressor would get far as there would be no air flow to push them, but you never know .

 

At 7000rpm with the engine chomping air at full chat you would be surprised ;)

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Are there any early warning signs of failure occuring, like a noise or lack of performance, boost low etc, or for the most part is failure sudden?

 

From the last few postings i think i have been nieve as the failures described are mega.Are there any club members who have experienced such failures?

Edited by herbiemercman (see edit history)
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Are there any early warning signs of failure occuring, like a noise or lack of performance, boost low etc, or for the most part is failure sudden?

 

If you get a catastrophic bearing, compressor or turbine wheel failure whilst spinning at 100,000+ rpm you will get no warning. I had a stock turbine wheel fail on a dyno and it was like a grenade going off.

 

If you do a YouTube search there are many videos of turbos blowing whilst being dynoed, this one is quite spectacular :)

 

Edited by Nic (see edit history)
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That was awesome, looks like it is a rare ocurance, but possible to have explosive failure. May be not over reving and an annual inspection of the turbo bearing and turbine fins is a good idea, it's a simple job and would give some peace of mind.

 

I have a big AMG Merc and i just fitted another turbo at 230K miles, the bearing was ok but the turbine blades were eroded 20% and boost was down, it took a long time for me to notice why i was loosing power, the MAF was changed and all the pipes checked but no problem, the last thing was the turbo, German engineering and not bad at 230K miles. Herbie.

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