CXRacing gt45r “ball bearing” turbo failed
03-17-2019, 07:57 PM
#1
CXRacing gt45r “ball bearing” turbo failed 
Hard to see in the photo but I am able to drag my fingernail and get it caught on the shaft...
Well figured it might happen and I’m glad I caught it before any catostrophic damage occurred.
My Ebay CXRacing gt45 shaft had a ton of wiggle (lateral play?)... the bushing in the turbine side wore out. Mind you this had 2500 miles on it. Thinking of replacing it with an On3 one.
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03-18-2019, 08:48 PM
#9
03-18-2019, 08:51 PM
#10
9 Second Club
And as Z says, the brass markings on the shaft would suggest a journal bearing core.
03-18-2019, 08:56 PM
#11
Bizarrely, this thread is about a Chinese GT45.....so WTF has Precision got to do with anything ? I've Precisions on some cars still running after 15 years...how many of your Chinese units have run that long ?
And as Z says, the brass markings on the shaft would suggest a journal bearing core.
And as Z says, the brass markings on the shaft would suggest a journal bearing core.
03-19-2019, 11:54 AM
#14
So this is a Turbonetics-style single ball bearing on the compressor side with a journal bearing on the turbine side? Sounds like if someone were to set up the oil feed with a restrictor sized for a dual ball bearing turbo, that journal bearing wouldn't get enough oil.
03-19-2019, 12:08 PM
#15
9 Second Club
03-22-2019, 02:41 AM
#17
So this is a Turbonetics-style single ball bearing on the compressor side with a journal bearing on the turbine side? Sounds like if someone were to set up the oil feed with a restrictor sized for a dual ball bearing turbo, that journal bearing wouldn't get enough oil.
after a good amount of research I discovered why it failed. This was advertised as a ball bearing turbo. To me, that means front and rear. It also came with a restrictor. A quick search on the interwebs told me that BB turbos need less oil hence the restrictor. Using my seductive reasoning, i deduced (sarcasticly trying to sound smart) that I needed it.
Then I learned a lot of the Chinese “ball bearing” turbos are hybrids meaning BB on comp side and journal in the turbine. So using a restrictor is good for the compressor side but fatal for the turbine side. WHY IN THE ACTUAL F*** would you make a hybrid.
Alas, I understood that going cheap had its risks.
So fast forward to today. I ordered one of Huron Speeds full journal bearing billet 7875s with a .96a/r turbine housing. I figured go slightly smaller on the a/r for quicker spool. My 5.3 couldn’t produce enough exhaust gasses to get the gt45 with a 1.15a/r to spool up and produce boost until the engine saw 3500-4K rpm
03-25-2019, 01:04 PM
#18
They are just copying an old Turbonetics design. It's not a bad design as long as you feed it enough oil. Sadly whoever is selling it probably doesn't understand what it is or how to set it up properly. They probably got complaints about smoking without any restrictor, so they threw a "ball bearing" sized restrictor in the box and the complaints stopped. Problem solved, right?
