Do-Luck (RXB) Center Support Bar
Personal Installation Instructions
by C. Jensen / L. Anderson
Instructions Based on Personal Experience
Begin with a little Disassembly and Preparation
Remove plastic doorsill scuff plates to gain access behind/under the carpeting and to the
mounting area near the seatbelt anchor.
Remove the lower seatbelt support assembly using a 14mm socket (the resultant large 14mm
cap screw will serve as the bar's primary fastening mechanism)
Next, I recommend discarding the stock lock-washer and then placing some cut silicone hose
in the new gap to help reduce vibration. This lock-washer steals precious threads from this
most precious of anchors in your car's safety system.
Look behind the carpet approximately 20cm from this primary bolt (toward the back of the car)
and note the perforated circle in the approximate location of the secondary fastener. It's like
it was waiting for this mod right out of the factory! Gotta love these cars!
Remove the circle of carpet and trim (if necessary) to match the newly revealed bolt hole.
The new bolts that came with the bar (11mm) will go in each of these holes.
Repeat the first (5) steps on the other side.
Installation of the Bar Itself
Locate and start the secondary fasteners on one side of the bar (since they're a little more
difficult to start) and do the same for the primary fastener, the bolt that anchored the seat
belt. Be careful not to cross-thread anything!
Adjust the threaded mid-section (using the mega-wrench included) until the mounting
flange on the other side lines up to its respective holes. First, make sure the lock nuts are
loose. They are loosened by rotating them towards the front of the car. To expand the bar
outwards, rotate the center nut toward the back seat.
Locate and start the secondary fastener thru the 2nd plate, then slowly adjust the threaded
mid-section until the flange lines up well enough to get the second and final primary fastener
Now is the time to line it up to your satisfaction. Be sure everything is all nice & tight.
Reinstall everything you removed. Beware that the carpet gets cinched down pretty tight and
Larry had to trim off the green plastic edge right near the bar on his '87T to get the door sill
plastic to mount w/o bumps. However, I did not. Whatever minor adjustment you have to do, it's
Lastly, I would retorque the center pre-tensioning nut after a couple weeks of driving to
get an optimal amount of preloading. I was able to crank down on it a little more after it had
time to settle and work itself in. Plus, the carpeting will compress a little more after a
while. Remember to retorque all (4) of the fastening bolts as well after retorquing the
Installation Time Estimates
45 mins -- 2 hours (depending on how much you savor this one :-)
Driving Impressions (- Chris)
Homer would give this one a "Woohoo!". There's a definite increase in the torsional ridigity
of the car. You feel it especially over bumps. From an engineering perspective, I'd say that
the natural frequency of vibration of the car is much lower now. When hitting bumps, the car
feels a little more "German" so-to-speak. It is, however, stiffer. Therefore, when riding on
washboard surfaces, you might pickup a little more high frequency vibration through the
car. Handling-wise, it's excellent and even more confidence inspiring... even for a non-targa
person such as myself.
Larry quantified it for targa people simply as "a 70% increase overall". He feels like he can
take corners much faster and with less dramatics. This is one helluva nice mod.
back to my mods page...
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Christopher M. Jensen
© 1995/96/97/98/99 CJ Inc.
Created: Apr 22nd, 1999
Last modified: Apr 22nd, 1999