Originally Posted by
beebone
Alright, I test different engine on my GT, Buggy engine makes car easy to drive because of low end torque. GT engine needs proper clutch adjustment to reduce low end stumble and stall. On road engine needs extremely late clutch engagement to get the right low end torque, I think the 8 or 9 mm insert help to bring the torque earlier right? But the run time.
Yes this is mostly true. The 8/9 restrictor releases quite a bit more power everywhere across the powerband. The runtime is reduced but not as much as you'd think. The 5-port GT engines are a good compromise between on and off road engines. Mind you if you run to ROAR/IFMAR rules then you are forced into a 7mm restrictor (stupid rule!).