Jump to content
The mkiv Supra Owners Club

Rear Suspension Knock


Need4Speed

Recommended Posts

Originally posted by John Packham

Steve

 

That's the spacer I need. I'm going to make some up. Have you got the spacer on upside down? Could you do me a favour and tell the length overall of that spacer?

 

Hi John, here is a better picture. The spacer is already on it - it's a brand new unit from Toyota and I assume it's ready to drop on. It also comes with a big bolt, a washer and two nuts. One for the bolt and the other for the top I guess.

 

http://www.cargills.demon.co.uk/supra/BBSImages/Shock-top3.jpg

Link to comment
Share on other sites

  • Replies 66
  • Created
  • Last Reply

Top Posters In This Topic

The issue of the boot rubber is that the diameter of the strut body doesn't match the diameter of the boot. I suspect it's from a standard strut which has a different diameter? (see diagram) The question of compressing the strut; I did use my entire body weight to do it, and not all dampers expand by themselves. In 17 years of racing I've dealt mainly with 2.25" coil-over units, and usually they stay where you put them. If the returning characteristics of my Bilsteins is OK then I'm relatively happy. They both return at the same rate.

 

The key issue now is that I've found a bodge job and so asume everything is wrong.

 

I'm considering replacing the whole lot just so I know where I am. My view is that the Supra is a serious car and everything should be 100%.

 

ps The rattle is still there despite swapping the struts.

diagram.jpg

Link to comment
Share on other sites

The spacer on the stock ones is not REALLY a spacer, it's an extension piece, threaded and Loctited onto the stem of the shock. Your example looks wrong, what holds this top hat shaped spacer onto the piston stem? As it's part way down the chroming i can't see how it could be threaded on? Is it just an interference fit? if so, that does NOT sound correct!! At the least I'd want to TIG it onto the stem. As a by the by I have never seen these grey shocks on a from the factory car.

 

Can't say about the springs from a photo, but the coil number and wire diameter suggest these are stiffer and perhpas lower than the springs hat are factory fitted with the yellow Toyota Bilstein dampers.

Link to comment
Share on other sites

Final thought. Get Matt to measure the fully extended length of his shock, and do the same with yours, if the shock isn't long enough, extended, it will certainly knock over bumps. Does it try to pick up inside rear wheels coming out of tight bends? Are you sure these grey shocks are meant for the car, or some others modded to fit?

Link to comment
Share on other sites

Chris/Steve I'll measure when I take them out again in the week. The damper rod is long enough that the spring is not preloaded though. There's definitely over 50mm of compression when the car is stationary, so there's plenty of droop. Traction out of tight corners is not a problem.

Link to comment
Share on other sites

  • 2 weeks later...

One last thing to try to solve the knocking sound.

 

I had exactly the same thing, knocking sound on one side and not the other with after market suspension mods fitted by someone else. The car made a noise going over bumps or into potholes mostly at ordinary speeds, worse slower.

 

Turned out that on one side they fitted the bump stop up side down so that the plastic ring end of the bump stop was at the top going into the mount. It looks like you've taken the whole thing to bits so i guess you would have seen this, but as in my 4 visits to get this put right people always put things on the way they came off so you never know. Good luck.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.