When it comes to comet 30 series torque converters mounted on a heavily modified engine, as most know, in stock form they limit the engines rpms. There are several well known ways to make comet torque converters run better but so far there is no magic part that can make one engage at 3000 rpms and pull to 8000s. as far as tuning there are different springs for the driver clutch to change with engagement changing when the shift starts and stops and you can get a stronger yellow spring for the driven to slow down and stretch the shift a little allowing the engine to rev higher. I have herd from many people saying the yellow driven spring isn't strong enough to hit the rpms they want but changing springs isn't the only way to slow down the shift in a driven. this driven clutch is nearly identical to a snowmobile clutch and works on the same principles. and most snowmobile clutch tuning company's prefer to change the ramp angles on the clutch helix before messing with the springs. the comet driven clutch has a helix so why has no one tried messing with the angles on it yet? I would think making a custom helix the same size with longer shallower ramps combined with the stronger yellow spring should slow down the shift a lot more. also a lot of people complain that the overdrive a comet 30 series asymmetrical clutch reaches is to high of a gear ratio and drags down the engines rpms. from what iv read the 20 series symmetrical clutch doesn't reach an overdrive ratio so wouldn't that be a better choice when searching for every last rpm?