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Old 08-08-2005, 09:53 AM
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Rear Drag Shocks on a Street Car?

The shop building my street rod (1939 Olds) has put in a coil over kit from Competition Engineering on the rear (PN C2051). Weight on the rear wheels is probably 1400 lbs. The shop installed 150 rate springs and 3-way adjustable shocks.

According to the Moroso/Competition Engineering catalogue these shocks (PN C2755) are for "Dray Racing Only, not for street use". The adjustments are 30/70, 40/60, or 50/50.

This car is only for cruising and parades, no drag racing. Before I take this up with the shop, I would like to know what the difference is between these "drap race" shocks and shocks for general street use?

1. How do drag shocks differ?
2. What setting on drag shocks is closest to a street shock setup?
3. If these drag shocks must be replaced, what type shock should I look for (that will mount on the coil over kit)?



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Old 08-08-2005, 08:36 PM
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Drag shocks are designed to shift weight in the car and to stop bounce. They work in both directions. Thus the percentage settings. In drag race applications. You would set the rear shocks at 50/50 and the fronts sb 90/10, bb 80/20.

90/10 would be closest to stock street. The warning for drag race applications only is to cover the manufacturers butt. The are probably not DOT approved. Also if some thing goes wrong and you try to sue. They will say, "You were told Drag Race only."

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Old 08-09-2005, 04:25 PM
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I would agree that liability concerns probably prompted the "for drag racing only" statement.

However, the shocks can do nothing to affect the weight transfer. Weight transfer is determined by the center of gravity height, wheelbase, and the acceleration. In fact, if the rear suspension is set up for 100% anti-squat, the shocks are totally unaffected on launch.
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