(03-07-2013, 10:35 AM)Anton Wrote: Occasional lol, its becoming more common when people are using bigger turbos. Some people have also been lifting the head and i've had HG issues. However people have been using ARP head studs which has cured that.
I don't get the whole thing about 'hybrid' turbos....
I think that's what some tried to do with the L series; ARP studs, but that idea seemed to be put to bed.
Hybrid turbo is just a turbo that's been made up of two different turbos, the only reason we tried hybrids on the L series because there we no direct bolt on turbos which meant the expense of custom downpipes and adapter plates which nobody wants to spend time or money on - so they tried to use the existing turbo and just upgrade the compressor wheel but as mentioned it wasn't very successful.
Now this other hybrid (the one used for this dyno graph I posted) someone had managed to find a turbo with the same exhaust manifold flange however the rest of the turbo wasn't ideal - so they took the turbine housing and mated it to a GT1752 so it's essentially some unknown turbine housing and GT1752 internals and compressor wheel housing - the guy wont reveal what the turbine housing is off (yet) because he was planning on making about 5 of these turbos and selling for profit.
It seems fairly easy to mate a TD04 to an XUD, aside from the actuator hence some people welding the wastegate shut, we don't have that luxury, which is a shame as TD04's are mega cheap!