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Re: Ok, I have a question, just installed UUC SS k (archive)

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Posted by Ron Stygar on June 23, 2000 at 22:52:23:

In Reply to: Ok, I have a question, just installed UUC SS kit posted by Jeff L on June 23, 2000 at 16:15:38:

Keep in mind that whatever percentage reduction in shifting throw you achieve results in the same percentage increase in shifting force. It's just lever physics. No magic here.
The stock shift lever in your car has a ratio of 4.86:1. The M-Z3 shift lever that you replaced it with has a ratio of 3.34:1. This results in a shifting throw reduction of roughly 31.3%. The shifting force goes up the same 31.3% amount. 3.34/4.86 = .6872427. 1 - .6872427 = .3127573. .3127573 x 100 = 31.3%.
Another example which takes into account the vertical off axis force. Vertical off axis force is the force felt at the transmission selector rod joint if the front and rear selector rod pins are not exactly inline. See the attached vertical off axis force pic. As mentioned above, the stock shift lever has a 4.86:1 ratio. The
M-Z3 shift lever has a ratio of 3.34:1. Say the force at the base of the shift lever is 26.51 pounds to move the transmission shaft (this is what it was in my '96 328is which uses the same transmission as the M3). With your stock lever the force at the shift knob would be 26.51/4.86 = 5.4547325 pounds. With the new M-Z3 lever WITHOUT THE ERK it would be 26.70/3.34 = 7.9940119 pounds. Still with me? WITH THE ERK it would be 26.46/3.34 = 7.9221556 pounds which is .0718563 pounds less, which is less than a 1 percent reduction in force felt at the shift knob using the ERK.
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