That's the story I got from Garrett themselves. That being said - I have a rebuilt VNT15 that was done by a company that I had heard some good things about(G Pop Shop). After getting it back I got word from Franko6 that they had gotten a few rebuilt by this same shop and they all failed...Ok I ask because I've heard that garrett doesn't make any pieces to rebuld their vnt turbos, and they don't allow distributors tor ebult vnt"s because they are hard to warranty and balance correctly
This is bull, There are companies producing OEM quality parts so rebuilt is as good as new.No, you can not reliably rebuild a vnt turbo. It is possible on paper, in theory, but reality is that no one so far does reliable rebuilds.
The thing is, how many rebuilders have the balancing equipment? If your rebuilder has the stuff and access to quality parts, I'm sure that they will be at least as good as new.I've had LOTS of turbo's rebuilt, especially PD140 'BKD' units that fail as standard often, and never had any issues at all. My turbo rebuilder has the latest VSR balancer and can balance past 200,000rpm, i'll scan a printout if anyone cares.
The basic part of a VNT turbo is no different to a W/G unit so its crazy to think this part cannot be rebuilt. The VNT mechanism parts are available new in the aftermarket.
Its like saying we can't diagnose our own problems as VW dont sell the software/cable (VAG-COM!!)
Problem is; rebuilders do not have access to original garrett parts for rebuilds. Garrett strictly controls where the parts are going. They might have a balancer, but again, someone experienced will have to do the balancing. Some turbo shops can't balance a new custom turbo build.
Those who say hybrids do not spin fast, your wrong. Vnt turbo can spool up to over 180,000 rpm/minute. Hence the reason why they use floating journal bearings. Ball bearing turbos spin around 100,000 rpm.
Their might be some rebuilder, somewhere in the world that might be able to do it. But why?
Savings in cost are minimal.
Quality of the parts is not known.
Lack of track record. ( specially in North America ) I never seen a rebuild last longer then 2 weeks.