In Reply to: "ERK"! posted by Bob ///M3 on October 05, 2000 at 10:54:20:
The clearance thing is really what the ERK is all about. UUC based it on the ACS carrier which had a raised pivot point, much like the ERK provides. ACS had to do this because they welded an extension onto the bottom half of the shift lever and that extension caused interference. Moving the pivot point up gave them the clearance they needed.
Of course that doesn't mean that is the only way to fix this. Both the above shifters adjust the lever top to bottom ratio by just adjusting the levers bottom length. If you don't extend the bottom as far (for the clearance needed) but also adjust the levers top length you can have the exact same top to bottom ratio (which means the exact same throw reduction) and not need anything further to deal with a clearance problem. Because there is no clearance problem.
This is what Ron Stygar's shifter did in my Z3. The UUC kit uses a modified M-Roadster lever. The length below the ball was long enough to cause the selector rod to hit my driveshaft. The ERK raised the entire lever upwards (which raised the selector rod) which gave me the clearance needed.
Ron's shifter for my car is based on a modified 2.8l Z3s lever. The bottom length of this lever is about midway between my stock lever and the M-Roadster level. With it installed alone the selector rod has no interference problems. To duplicate the top to bottom ratio of the M-Roadster lever Ron also modified the top of the levers length. He made it the exact same ratio (he could have done whatever % reduction I desired) as the M Roadster lever. This resulted in the exact same throw (and force) as the UUC setup but required less parts to work.
Check out the link below for another guys great writeup on shifters.