Thread: Sticking VGT cleaning

Came across this searching for ways to clean a sticking VGT

[ame]https://www.youtube.com/watch?v=pAJSOsIbqyc[/ame]

Not sure I'd be game to spray that much liquid down my intake.

One big engines the turbo has water injection nozzles at the compressor inlet for cleaning the compressor. We inject solvent and water mixed together to clean the compressor blades, you can notice the performance improvement immediately by lower EGT. ( we do on line at MCR) The surging shown in the film could just as likely be caused by compressor surge as by stuck VG Turbine nozzles.

On your turbo you can see oily residue sticking to the compressor usually because your crankcase vent breathes into the air inlet. I have one of those things a doctor puts in your arm (canula?) with a variable valve. (Work in progress for 5 years, a "gunna" job, it took some explaining for a doctor fiend to give me one) . The plan is to run the engine and let the bag empty at "x" drops per minute into the compressor inlet. the water droplets will be "smashed" by the compressor and mechanically remove any deposits there.

The big turbochargers have another water injection system at the turbine inlet, ( say where your EGT probe is), we inject water at idle while the turbo is warming up, again the water stream smashes onto the blades and breaks the carbon off them. Those turbos have a drain in the outlet, initially the water will come out dirty with carbon, we keep injecting water in there until the water come out clean.
It's questionable if there's much benefit for a car that gets a good flogging occasionally, also the fuel we burn in our cars is such high quality the deposits on a well maintained engine would be minimal. Example the old turbo on my defender (200,000km) the turbine blades only has some black dust on them. The compressor looked a bit oily. Only time will tell with my VGT cheers simmo.