924RACR
Joined: 29 Jul 2001
Posts: 9075
Location: Royal Oak, MI, USA
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 Posted: Tue Apr 15, 2008 4:22 am Post subject: Rear coilover shock option |
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OK, as promised, here's one of the cheap rear coilover options we've found. Not trivial to implement, but inexpensive enough to make it worth it.
It's the QA1 shock, a single- or double-adjustable coilover with monotube construction, digressive valving. These guys seem to have the best pricing:
http://autofabcart.net/qa1shocks.aspx
It's the Proma Star shocks, $150 for single-adjustable, $250 for double.
The main PITA is that these are 1/2" rod end mounted, not 12mm (as our stock shocks are). What we've done on our racecars (I'm actually running Bilsteins in the back, but same mounting) is to drill out the mounting spots to 1/2" and use 1/2" Grade 8 bolts. This requires a heavy-duty drill up top, as you're milling through a long bushing; it will eat any puny cordless drill.
You also have to make up spacers to locate the shocks centered in the mounting spot; the 1/2" rod ends are much narrower than the bushings on a stock shock. So what is the easiest is to get 1/2" ID pipe or tubing, and cut lengths as needed to fill the gap.
Alternately, if you have access to a machine shop and the time and inclination, you can have the shop machine spacers that will fill the gap and also allow you to use the original 12mm shock bolts.
Hope that helps...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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