Some possibilities for you Sam..
- Down on compression
-Down on boost ...air leak .
-Restrivtive air filter (power drops away a bit early ooking at the graphs)
- Bypass valve spring broken which losses boost
-Conservative RR, or one with inadequate fans...you need to monitor the intake temp off the OBD2 port and say your not happy if they cant keep it below say 40 deg C
GTT Crank pulley gives only about 4bhp top end but a nice increase across the mid range.
Manifold? Not sure on your setup but the
JCW Motorsport one gains 3bhp on a GP......... I do know that.
-JCW210 is typically are about 195-197bhp not 210bhp .
It may be a 'little bit of everything' rather than one thing.
Best Regards Roland GTT
