its like moutain bikes gearing....bigger G's resulting the pedal gear will be the bigger compare to the rear one at the tyre....so higher boost is possible without compensating the turbo life n working efficiency...
the IHI of ur frens maybe got problem with air fuel setup or maybe their engine pressure is not ennuff to spool the turbo...maybe????
the IHI of ur frens maybe got problem with air fuel setup or maybe their engine pressure is not ennuff to spool the turbo...maybe????