jza80

iTrader: (32)

I have the Showa Bathurst coil overs on my FD, these use the stock Mazda shock absorber upper hats with a height-adjustable shock body. It seems that the shock bumper inserts (kind of a yellow color foam) are degraded and basically falling apart. The shock uppers themselves are in perfect condition otherwise, just the bumper material is bad. I am wondering how important this travel limit bumper is for a street driven car, or if there might be a replacement part available. For now I just cleaned out the crumbling inserts. If anybody has info on replacements I'd appreciate it. Shocks are in perfect shape otherwise, so I'd like to keep using them as they are a great street shock absorber albeit a real pain if height adjustment is needed.

gracer7-rx7

iTrader: (16)

That is typically referred to as a bump stop.
The stock Mazda upper shock mounts typically have a hard rubber bump stop. It is removable with some effort. If yours have a foam style bump stop as you make it sound, it very well may be aftermarket unless it came with the coilovers.
I'd recommend measuring the length and attempting to find a similarly sized aftermarket bump stop and trim to fit.
When I did my custom valved Fat Cat coilover setup I wound up using Miata bump stops and trimming to fit. 5xracing took over the Fat Cat bump stop business. Here are the various bump stops they offer:
https://5xracing.com/c-1231774-na-mi...-hardware.html

Some pics and info in my suspension thread: https://www.rx7club.com/suspension-w...setup-1104755/

You may be able to find similar elsewhere.

jza80

iTrader: (32)

Thanks for the link! Yes what I am asking about is the bump stop. It's hard to know the density of the existing bump stops as they are disintegrating into crumbs kind of like what happens to poly engine mounts. The material is yellow/orange in color, probably was originally ~1 inch in height but it's hard to know for sure since they are falling apart. I'll look into the offerings at 5xracing.

billyboy

More important than on tracks.....they don't tend to have potholes, spoon drains and speed bumps there! Stock FDs tend to ride the bumpstops, particularly in the rear, you run the risk of internal damage without them. Bilstein, etc, would have a nicer riding foam stop that should fit.

Zepticon

iTrader: (1)

I had the exact same issue on mine. As far as i found there are two options:
- Use some other bumpstops, from say a MX-5
- Buy new top hats that have them integrated like on the OEM suspension. (they only cost 20-30 USD more than the bumpstops xD)

I went for the later option. The original parts for the Showa Bathurst are not available anymore.