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Old 03-28-2012 | 10:44 AM
  #879  
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JohnB
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Joined: Aug 2002
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From: Oregon City, Or
Default B4 front kickup experiment

First here is how I reduced the amount of kick on the front of my Associated B4.
Where the front bulkhead mounts to the chassis I added a small plastic washer that is .055" thick on each of the rear screws. So when all four screws are tighten the bulkhead sits at an angle to the chassis.

http://www.boiserc.net/Gallery/displ...lbum=136&pos=3



In doing this a gap is left under the top plate where it mounts to the top of the chassis by the servo saver. The gap ended up being about .145". So I found three spacers that thickness.

http://www.boiserc.net/Gallery/displ...lbum=136&pos=0


If you notice the chassis mount is beveled and the bottom of the top place is keyed to match, so have to bevel the inside of the spacers to match. This done very each with a counter sink bit.

http://www.boiserc.net/Gallery/displ...lbum=136&pos=1



So the result. We currently race on an indoor dirt track that is about 75'x70'. It's not super high bite, but has good traction. My car is absolutely dialed. I'm an old guy that has been doing this since about 1985 and has never really been satisfied and continually “tinkers" with things to try to make my car better. I always try small changes like this. If they work, awesome, your car just got better, if not, change it back and go on. The results of this change was not nearly as noticeable as I thought it would be. The car had a little bit more turn in steering. I will leave it for another race or two but will probably go back to the stock kick up. We'll see.
The bottom line is I now have another tuning option to keep with me and the ability to make the change quickly if needed.

Last edited by JohnB; 03-28-2012 at 11:02 AM. Reason: Hmm, guess I don't know how to post pictures now. Better for do some reading and figure it out.
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