ok so I spoke to Jim Berry on the phone.
Very surpised at what he said.
here it is in point form:
- Unles it is cracked, Do not change the standard Flywheel.
- Do not change the weight of the Flywheel. The japs got it right and we will not like it at all, for the 20,25 or 30. (Knows about the 30 Hybrid.
- The Standard nissan item is very strong and the talk about blowing them to pieces is a load of shit. He said only holdens and fords do that. Mr Nissan got it right apparently. Unless the guy that bolts it on removes the dowel, or doesn't bolt it up right. They are made out of good cast iron.
- Chrome Moly Flywheels are shit and are too hard
- Excedy have crap Centers and pressure plates on quite a few models (my model is one for example)