Sadly I blown both turbos. Firstly they start whistle quietly and about 100 miles later I get Check Engine light and no boost. Firstly think that it`s lose turbo hose, bud sadly I was wrong.
Cayenne Turbo 2018, 43000 miles / 70000km, last oil change ~5000 miles back, serviced in porsche centrum, no warranty, ecu tuned ~month ago to 700hp, bought 2 months ago(don`t know previous owner).
Haven`t taken out turbos yet, but problem is probably turbo oil filter, what is cloaked. There are lots of Audis with exactly same problem. For reminder Cayenne Turbo uses same Audi 4.0L engine. (there is even poll have you turbos blown yet https://www.audiworld.com/forums/a8-...a8-s8-2966653/)
It can also be bad ecu tune(it was tuned 1 month ago), but I don`t have any idea how bad ecu tune can blown both turbos. Bad oiling can do it easily.
Any ideas where to get new turbos? Or mybe is better to upgrade it for more horsepowers now?

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ECU Tune = Pay to Play.

 

So car did 43k miles with no issues. One month after tune, boom. Seems very clear to me what facilitated the failure.

Anyway fix and move on.

 

The fact that both turbos were destroyed at the same time may point to another cause — FOD. We often see this type damage when turbine engines ingest foreign objects.

A pair of Borg Warner turbos are capable of sucking over 80 pounds of air per minute, or 17 cubic feet per second at 150,000 RPM. Given the higher boost (intake suction) levels of the tune, it is possible that a foreign object entered, or material from inside the air intake system detached and entered both turbos. Check the integrity of your air filter and look for missing bolts / screws / pieces in the air intake system.

Of course, your turbos could have suffered simultaneous over-speeds due to a bad tune. The centrifugal force on the turbine blades increases by the square of the RPM. At these RPMs, the increased force can actually stretch the blades and cause them to contact the turbine housing.

Here’s the big problem: All those bits of turbine blades were blown into the charge-air pipes and into the intercoolers. The smaller bits probably entered the intake manifold and were sucked into the cylinders. This is a major malfunction that won’t be fixed simply by replacing the turbos.

Those turbine pieces lurking in the system may eventually dislodge and get sucked into the cylinders. And if something is coming apart in the air intake, it will FOD your turbos again.

How do I know? A sheet metal tech forgot to cover the turbine engine inlet when repairing an engine intake. Metal shavings fell into the engine and we had to change engines. Guess what? Nobody cleaned the engine intake before the new engine was installed. Poof — two in a row! Another engine ruined.

 

this does look like "physical" damage as opposed to something that could be caused by software, but I'm new to this topic - so I might be wrong and welcome correction.

 

That's not tuning, that's physical damage to the turbos.

 

Yes, he is under the 80,000 km warranty so if he isn't out of time, I'd take it to the Porsche dealer in Estonia and ask them to fix it under warranty.

 

Discoloration on the turbo heat shields suggests excessive temperature from the tune.

The two turbos have different damage patterns. Possibly a bearing went to heaven and the turbine started wobbling and wiped itself out.

 

That's what I was thinking too....the bearings went south...

 

Worth a try if under warranty. If they find out a month before he tuned it to 700Hp from 520Hp he probably has a better chance winning the lottery.

 

Putting that info on the internet is another problem. He should keep that s*it private.

 

I don't know, do you think the ECM would store that type of information?

 

a tuned ECU is laughably easy to detect. same with piggy back tunes but just slightly harder since boost pressures etc will be out of spec a little depending on how aggressive it is. At least a piggyback is far less invasive

 

Manufacturers must love tunes at some level, super easy to detect and an easy out of all potential warranty issues.

 

I know, I was joking, of course.

My wife drives a 2018 Honda Odyssey that suffered from delayed throttle response/transmission delay that took Honda over a year to resolve. They initially thought it was a fault within the transmission and ran diagnostics. One of the tests reported on "torque load" on the transmission. This was to determine if we had towed more than the 3,500 lb limit. This came back as OK and the fault was ultimately found to be in the engine/transmission control software. It was reloaded.

While many have success with "tunes" and as posted above, something from the intake may have caused this damage, it's an expensive lesson for the OP as he'll possibly need a new engine if garbage has been sucked into the cylinders. I guess many like to "hobby" but if something goes wrong, it can get expensive.