Depends on what spring you are referring to. The main torque spring or the 3 small clutch springs. The main torque spring determines how long you stay in low gear and how fast it downshifts. The red keeps you in low longer and downshifts quicker, but also causes your engine to rev higher.
The clutch springs determine what rpm you clutch engages for takeoff. The yellow 1500rpm, the red 2000 rpm.
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