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One of the best ways to compare pDrive ramp angles is to know how TRA ramp angles work. Ramp angles are applied on a cam arm or ramp, providing the way the sled pulls hard. In simple terms, looking at a TRA ramp is a way of analyzing a pDrive ramp and you can answer tuning questions. How is this ramp with a higher curve work different than a ramp with a lower curve. Is it worth sometimes modifying a ramp, pDrive or TRA? Sometimes it is yeah, you bet, even waAAay better than using an adjustable pDrive ramp. I take you through the knowledge of the power of a primary clutch ramp. Getting into the pDrive ramps differences vids to come. Enjoy the vidya and remember "stay.....tuned !"