replace tension compression rod bushes
Posted 07 September 2011 - 06:23 PM
So what has anyone on here done with their cars.. Thanks Jim
Posted 07 September 2011 - 07:09 PM
We both found less wandering when braking and more direct steering particularly while cornering, with no added harshness. I guess it may be over kill for a daily, kinda depends on what driving you will do. Track, daily, weekender?
Check these out... http://cgi.ebay.com/...=item3cb9fb3426
Posted 07 September 2011 - 09:01 PM
Would like to get or make a set
Posted 07 September 2011 - 10:09 PM
Posted 08 September 2011 - 08:32 AM
In my opinion, the polyurethane bushes really aren’t that harsh. A factor many people forget is how much ‘crush’ (preload) is put on the bush once the retaining nut is done up. Some poly bush kits have shorter crush tubes giving more preload on the bush. More preload = less give.
Posted 08 September 2011 - 11:09 AM
Posted 13 September 2011 - 06:51 AM
Thanks for the replies Boys, My car is certainly no rocket, now a weekender, occasional trip away & the odd sprint track day. I would like to find out if anyone has heard of the rubber/poly combination & what the outcome was.. Thanks Jim
I went the full poly route and snapped the T/C rod and almost my neck in a possible accident so now religiously tell people to avoid full poly! I was barreling down the back straight at 200 kph, down hill in to a 90 degree right hander, and had the right hand T/C rod snap at the bush. I can tell you I made the corner without hitting the sand, I even didn't brown my pants but MY GOD it was close!
If you want to keep the standard rod then you use poly on the front to keep from compressing and away from all the altering geometry goodness under braking and a rubber bush on the rear to make sure there is still play enough so the rod doesn't snap due to stress. Think of the rod like a paper-clip. If you use poly front and rear there is so little movement in the mount that the rod is constantly bending under suspension movement, eventually, just like the paper-clip, it will snap. Rubber on the rear allows the rod to move vertically without allowing it to squirm around under heavy braking loads.
Personally, I have gone to and swear by Techo Toy Tuning spherical ball jointed T/C rods, but they really are a race only mod and are excessive on a street car, not to mention likely illegal.
Posted 13 September 2011 - 01:02 PM
Posted 13 September 2011 - 04:24 PM
Posted 13 September 2011 - 04:50 PM
The T/C kits come with a measuring gauge to ensure the bushes are not overtightened and allow enough movement to prevent flexing the rods. I ran urethane for around 7-8 years, it was one of the first mods I did to the car when I got it, T/C rod bushes as well.... Maybe it was just luck that mine survived. I've never really paid that much attention to them, but I think from now on I'll be removing before events and checking them for straightness, twisting, corroision, streching of thread.
It's the first I've heard of it on a zed, could it just be 30+yrs of stress and fatigue... Corrosion?
Posted 13 September 2011 - 05:10 PM
We'd raced the car for 5 years before this happened so it was very unexpected. However, the zed gurus around the country all said they'd heard of it before and use the poly and rubber trick to avoid it. Stewert Wilkins also does a custom, thicker, threaded rod that looks good if you need/want a standard looking part, otherwise for the same price you can get in the TTT rods. Be careful with them too tho, as I had one of the retaining nuts come loose and fall off :s I seem to be cursed with these rod issues!
However, I came away fine and now just spend that much longer going over the car between events on the day and have a pretty extensive between race meets check list.
Posted 14 September 2011 - 08:09 AM
Whittie, did it snap at the end of the threaded section or at the step where the larger washers sit?
... and had the right hand T/C rod snap at the bush.
P.S. MS Paint for teh win
Posted 14 September 2011 - 05:13 PM
Posted 26 October 2011 - 02:46 PM
The T/c is certainly stock looking, but I doubt if you will have any problems with the retaining nut he supplies.
Whittie, may be the way to go?
Posted 26 October 2011 - 04:08 PM
The rods that are on my car do not have the step down like in the drawing that DAZDA posted and are 17mm thick the whole way through so they limit the stress point where they normally can break.
I have got one of those t/c bush kits like the one below, but since it won't fit over my large rod, I am willing to let them go if someone wants them for $25 + postage.
Posted 26 October 2011 - 04:23 PM
Posted 26 October 2011 - 05:50 PM
Posted 26 October 2011 - 05:59 PM
I did tell a lie. The ones I have do have the step down, but the threaded section is 17mm diam and the rod is 20mm diam. So a lot more "meat" there and gives a little adjustability with the longer threaded section?
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