t4 vs t3 t4 hybrid

[mattallac]

Need to check what A/R i have (warning :I am not in any way a turbo expert ,I'm learning) , but i would be interested in a different trim and keep my t4 and not dick around with fitment as long as i can get the spooling to start at an earlier rpm (3500). Questions :1.I have read about taking material off the A/R trim turbine to make a quicker spool, less rotating mass and better exhaust flow. Don't know how good or bad that is ?2. BB turbos are a good thing (for application) ,but at our shop we have had some problems with "bb" turbos with long term or extreme use on them ,RR why is this your preference ? In my limited experience 200 to 300 rpm quicker spool with the exact same turbos is the difference . Journal or bb can be a feeling issue (meaning how the turbo reacts to the drivers pedal action ). Price is also a huge factor BB is almost double . Remember its a street car and I'm not trying to make max HP, just a fast vintage driver .