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Old 12-16-2016, 01:12 PM   #931
berlow94
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It is a brake bias adjustment knob.
The car has no brake booster and runs dual master cylinders. The knob attaches to a cable that spins the threaded rod actuating both master cylinder.
It allows me to change my front/rear bias while out on track.


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Old 01-09-2017, 08:41 PM   #932
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I have the z4 3.0 shifter just installed it today but it was very stiff and notchy wanted to know how to clean up the stiffness makes me feel like I didn't install it right
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Old 01-11-2017, 06:07 PM   #933
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Quote:
Originally Posted by ckarsonkidd View Post
I have the z4 3.0 shifter just installed it today but it was very stiff and notchy wanted to know how to clean up the stiffness makes me feel like I didn't install it right
You're probably so used to the stock "bag of dicks" shift pattern that you think the Z4 is too notchy. Give it a week.
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Old 04-19-2017, 02:55 AM   #934
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I have been running my custom shifter and noticed that R and 5th gear engagement is not as smooth as I expected to be. The reason is, like all other short shifters, the extra length on the pivot point make going into R and 5th gear in a arkward angle as illustrated in my previous post.

So, I have come up with this design. It can be fully adjustable because the spherical bearing can be set at any length in its pivot point. making it any throw desired.

Attachment 112023
I found an old auction for a similar design from Belgium, but the arm is mounted to the transmission, not the chassis:








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Old 04-19-2017, 07:12 AM   #935
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That is a very clever setup!!
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Old 04-19-2017, 10:49 AM   #936
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It would be cool to see a video of that setup in action.
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Old 04-19-2017, 01:07 PM   #937
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That is exactly what I wanted to do, but dont have the resources like cnc or lathe. I bet it shift like butter.
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Old 04-19-2017, 08:35 PM   #938
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This design transmits all the engine vibration and noise through the shifter. It would be quite significant, especially with an M42. It would probably rattle a shift knob off pretty quickly.

Quote:
Originally Posted by raudonis View Post
I found an old auction for a similar design from Belgium, but the arm is mounted to the transmission, not the chassis:
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Old 04-20-2017, 05:16 AM   #939
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On a racecar that doesn't matter so much... for the street it would probably get annoying.
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Old 04-20-2017, 09:42 AM   #940
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If the engine is health, it doesn't rattle at all. I am running a daily solid shifter with bronze bushings with no problems except for the extra effort in certain gears.
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Old 04-20-2017, 04:14 PM   #941
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If the engine is health, it doesn't rattle at all. I am running a daily solid shifter with bronze bushings with no problems except for the extra effort in certain gears.
My guess is that your solid shifter setup is still attached in the rear at the body, so its not a full transmission mount like this setup. The half body mount still provides some insulation.

The rattle I'm referring to is about vibration. The M20, like most straight 6 engines, are pretty smooth as their design is inherently balanced. 4cyls on the other hand have a harder time with it. The M42 has lots of vibration, especially because it doesnt use balance shafts to counter any of it. I still remember using e28 rubber motor mounts on in my 318is (OEM m42 mounts are liquid-filled and expensive). The vibration was ridiculous and I went back to OEM.

The rubber isolation that BMW and other manufacturers design into shifters is to insulate the cabin from these vibrations. Unfiltered M42 vibrations might actually make the shifter more difficult to use.
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