Darren, ive got a Turbo Technics Turbo, now my oil is flowing how it should the turbo is wonderful
, not exactly sure what the specs are but I will find out, Its a Roller Bearing which can run up to 26psi, so obviously at 1 to 1.2bar it`ll be very efficient and well within its range.
What ive noticed is, its slightly more laggy than the standard turbo, but when it spools up it spools up hard and doesnt feel like it runs out of puff up in the rev range. Still a very responsive Turbo.
You could also look into a company called Turbo Developments
http://www.turbodevelopments.co.uk/ who are based in London, when I had my 11 Turbo most of the ownser club used their hybrids and they built me a T2/T25 which was fantastic on that car, we all used the turbos for trackdays and never skipped a beat. I was going to use them to build a turbo for the Pulsar but I had the Turbo Technics turbo built for me for free as I was owed alot of favours.
The other option is to just get yours rebuilt with a roller bearing and then you wont be at the limit of the T28 running 1bar. I guess really, you just want a T28 that can run 1 bar or a little more all day long without running out of puff.
I have found that Turbo Dynamics dealers say turbo technics are rubbish, and Turbo Technics dealers say Turbo Dynamics are rubbish, both are pretty much the same I rekon.
Sam