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Smoke on boost ?

On the way home I decide to give my 930 a bit of a push,to see how the performance is now that I have put a few klm since the turbo rebuild.

So I dropped back to 80kph, shifted to 3rd gear and gave a good bit of throttle bringing the rpm to around 3200 with 0.8 bar with a shift into 4th gear only to see a cloud of smoke left behind me.

I did this a couple more times and again there was some trailing smoke all be it less than the first time.

Any ideas why this would occur ?
Old 06-01-2018, 10:49 PM
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turbo bearings
Old 06-02-2018, 02:19 AM
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Crotchety Old Bastard
 
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Your turbo was recently rebuilt?
Oil is pushing past the seals causing the smoke. If your turbo was recently rebuilt what was the cause of the failure? If the underlying cause was the oil system and not the turbo you will keep blowing turbos.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 06-02-2018, 05:19 AM
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A bit more info to note:

I had a look under the rear as there was an oil spot on the garage floor and found it has come from the wastegate. The exhaust tip is dry and the wastegate wet.

Old 06-02-2018, 10:43 AM
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Quote:
Originally Posted by RarlyL8 View Post
Your turbo was recently rebuilt?
Oil is pushing past the seals causing the smoke. If your turbo was recently rebuilt what was the cause of the failure? If the underlying cause was the oil system and not the turbo you will keep blowing turbos.
Hello Brian,

This is the 930 in Australia which I had the turbo sent back 4 times before the turbo appeared to be fixed and since I have put around 100klms on it.
I did have an awful lot of oil throughout every part of the engine, even to the point of experiencing hydrolock.

Could it be possible that this oil coming from the wastegate be reminant from that ?

Steve.

Ps. It was turbo failure not oil system.
Old 06-02-2018, 10:52 AM
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^^^

Steve, that could very well be oil that entered the wastegate one of the times when your cylinders filled up with it to the point of hydrolock (although I am surprised to see that the oil is still so wet looking). Maybe do some more boosted driving, causing the wastegate to open, and see if it clears out before starting to get too worried about things like broken rings and/or severely worn valve guides (both of which could cause what you are seeing).
Old 06-02-2018, 11:23 AM
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Quote:
Originally Posted by Rawknees'Turbo View Post
^^^

Steve, that could very well be oil that entered the wastegate one of the times when your cylinders filled up with it to the point of hydrolock (although I am surprised to see that the oil is still so wet looking). Maybe do some more boosted driving, causing the wastegate to open, and see if it clears out before starting to get too worried about things like broken rings and/or severely worn valve guides (both of which could cause what you are seeing).
Hello Rawknees,

Do you think there is a way to clean the wastegate without removing it. It does not look as if it would be easily removed due to corrosion of the nuts and threads ?

Steve.
Old 06-02-2018, 11:41 AM
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Steve - no to cleaning without removing & dismantling, and I would not do that for the very reason you describe (just asking for trouble). If there is old oil in it, it will clear and burn out with a few more boosted runs, so if it says wet, then it will be time to start investigating.

The actual dump pipe in your picture could stay wet for some time, as it sees very little heat and air movement (relative to the rest of the exhaust). If you want, you can spray brake or carb cleaner in that to wash it out - won't hurt anything.

Last edited by Rawknees'Turbo; 06-02-2018 at 12:40 PM..
Old 06-02-2018, 12:38 PM
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Quote:
Originally Posted by Rawknees'Turbo View Post
Steve - no to cleaning without removing & dismantling, and I would not do that for the very reason you describe (just asking for trouble). If there is old oil in it, it will clear and burn out with a few more boosted runs, so if it says wet, then it will be time to start investigating.

The actual dump pipe in your picture could stay wet for some time, as it sees very little heat and air movement (relative to the rest of the exhaust). If you want, you can spray brake or carb cleaner in that to wash it out - won't hurt anything.
Will break out the brake cleaner, and give that a go.

Thanks mate.
Old 06-02-2018, 01:24 PM
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Quote:
I had a look under the rear as there was an oil spot on the garage floor and found it has come from the wastegate. The exhaust tip is dry and the wastegate wet.

That's a whole different problem. The wastegate sits higher than the J-pipe which means god knows how much oil is in the entire system. You really need to know where this is coming from. In your shoes I would remove the J-pipe then each bank of exchangers and examine everything. If whatever caused all that oil to be there is no longer dumping oil then you can wash out the entire system. If the problem has not been cured you will find where it has it's origins.
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Old 06-02-2018, 04:31 PM
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Maybe you just need to do a track day so you can blast all that crap out... maybe not while someone is right behind you.

When you get tired of it all ditch the mosquito fogger turbo and get a Garret.
Ball bearing GT35R or a GSX61. Chris at Turbokraft is very helpful here and he can fix you up.
Old 06-02-2018, 05:46 PM
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Thanks guys,

I donít get to drive it much so after getting it out and giving a few good boosted runs I will respond with the results.
Old 06-02-2018, 07:59 PM
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Crotchety Old Bastard
 
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Quote:
It was turbo failure not oil system.

Turbo oil system failures often cause turbo failures.
If the oil in the exhaust is from an old problem that is now fixed I would still want to clean it out of there. Coked oil in the wastegate and turbo can be harmful and it sure isn't efficient to the exhaust system as a whole.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-03-2018, 06:28 AM
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