CLUTCH CALIBRATION GUIDE:
There are 4 main adjustable components in an EVP Spec TAPP Clutch, these are:
Ramp Profile – Your TAPP clutch comes with a set of pre-chosen ramps that have been tested in many scenarios and have been deemed to be the most generic in most situations. Changing the angle or profile of the ramp will have many effects on the shift profile. This should only be done by an experienced tuner; you will likely not need to change this.
Ramp Angle – The ramp angle in your TAPP Clutch is adjustable from the outside via the use of the Quick Shift Bolts. As with other clicker style clutches, the higher the number, the higher the RPM. This will mainly affect the full shift speed but also affects the engagement and low speed slightly. IMPORTANT – Always adjust the ramp angle in pairs across from each other. If you do not, the clutch will be out of balance.
Roller Size – Your clutch was shipped with a predetermined roller size for your application. There are 3 sizes of rollers available: standard, 1mm oversize, and 2mm oversize. Bigger rollers make the low end “quicker RPM’s” but shift out quicker and lower the full shift RPM. Smaller rollers make the engine slower shift and raise the full shift RPM. This has to do with the angle of the arms combined with the weight difference of the rollers. IMPORTANT – As with the ramp angle, roller size must be done in pairs across from each other. Failure to do so will result in an imbalance of the clutch and possibly failure.
Weight Adjustment – The weight in the arms can be adjusted in two ways: set screws in the arms, and washers on the roller thru bolt. As with all other clutches, add weight to lower RPM, remove weight to raise RPM. Set screws in the arms affect the low-speed shift points more than the high speed and will reduce the max RPM, and weight on the roller bolt acts like tip weight in a conventional clutch affecting the high speed more than any other part of the curve. Adjust this as needed for your application. IMPORTANT – As with all other adjustments, do this evenly and only in pairs across from each other, failure to do so will result in an imbalance of the clutch and possible failure.