What does re-valving shocks accomplish? When is it needed?

[Steve@Rennsport]

Originally Posted by sugarwood

Are you saying you've never heard of this, or that it's not accurate?

https://youtu.be/BiW0ISi8N-w?t=44s

Its not accurate for a multitude of reasons.

[ted]

Originally Posted by RDM

So what would the recommended rebuild cycle be for Bilstein shocks on a street-driven car (years or miles)?

According to RE Suspension road race shocks need a rebuild every 3 or 4 years.

Replace oil and seals and sometimes the washer/shim stacks.
The oil eventually gets contaminated and that accelerates wear on seals and metal parts.
Apparently the thin metal washers/shim stacks in the shocks with time deflect and need to be replaced too.

Off road racers in extreme conditions do this a few times a season.

Production car shocks are said to last 50,000 miles. ymmv

A set of adjustable racing shocks that cost $2k to $4k+ that get rebuilt for $300 makes sense.
If you have less expensive shocks just replace them in pairs.

[ted]

Originally Posted by sugarwood

On other cars, it makes sense if the shock has no oil, there is no resistance, and a car will bounce on the coil springs when the spring decompresses.

The jounce is too random.
How much compression is in a good jounce?

I cant even jounce my race cars or 1 ton truck.

[911pcars]

Are you road racing where custom-valved shocks are mostly used? If not, standard, HD or sport shocks should be enough options for most owners. However, as always, YMMV.

Sherwood