Balance Pipe = Low RPM torque
The R80G/S from 1980 to 1987 produced 56.7 Nm / 41 ft lb at 5,000 rpm. This model did not have the balance pipe and the collector box was a simple but flawed design.
The Later models fitted with balance pipe and large centre box was giving 61 Nm / 44 ft lb at 3,750 rpm.
The short shaft and centre stand of the pre 87 models does not accommodate the larger centre box so in this case fitting some of the aftermarket systems might not have much of a negative influence on low RPM torque.
If you do not mind the slightly reduced Horse Power and prefer torque at low RPM it will be best to stick with the original exhaust from BMW on all the models from 87 onward. Basically this is all the models fitted the with Parra-lever suspension.
|