My 1st failure was so bad it was hard to distinguish the cause without stripping. It lost a chunk off the exhaust housing, bent the shaft and threw the compressor wheel nut off and popped the snail off. As said, they said oil starvation or foreign object, which one I never found out.
The second one was down to over speed even though on Garretts over speed example sheet where the whole exhaust wheel has exploded the root or heal of the blade was intact, this was the bit missing of my turbo.
Also as I am running a very sweet stock engine to get over speed I must have been running some amazing boost that would have killed the engine.
Funny thing is, I have had the original turbo that had done over 60k and was perfect when I removed it to "upgrade"

then after the 1st failure I replaced it with another CT20 borrowed of a friend which was perfect. This was replaced with the second attempt which lasted 1500 miles, whan this one went bang I bought a used CT20 which is still mint.
All turbos were primed and driven carefully for a week or so, the 1st one was driven gently as the PFC only had a generic map of a car with the same mods as mine (turns out it was almost spot on).
Odd how only TT units are affected by the oil starvation issues and or are hit by all the foreign bodies managing to get clean through my engine?
I would never use this company ever again, there are other more reputable companies out there. Ok, they might not be as well known but IMO they can't be any worse.
My TT experience cost me over £1500, Garrett money
