Clunk under hard cornering - Bushes?

[Roadrunner]

Thread revival to close it off. Had the bushes changed to super pro polyurethane and after several track days, not a single clunk.
Very happy.

[greenMachine]

Oh. Polys eh?!

Tell you what, when I take my rubber bushes out, I'll save them for you, you may find a use for them .

Seriously, now that you have those useless pieces of steaming sh!t its a bit late to be giving gratuitious advice, but ...

As an ex-Superpro user, my advice is don't, but if you do, keep the grease up to them. Polys have a high degree of stiction - they don't slide easily. They rely on the lube, and the lube gets squeezed out fast. I don't think there is lube known to man that will stay there and keep working, not even that horrible stuff they come with. What can you do? Put grease nipples in and grease them regularly, at least every six months, preferably more frequently. The bushes need to be drilled through to the pins for this to work (and poly doesn't drill well). The best method is to dismantle them, clean, re-grease and re-assemble, but that is not something that many are prepared to do on a regular basis.

I pulled mine out of the racecar and replaced them with delrin (poly/bronze in some places). I found none of the pins came out easily, all required a hammer, some serious hammering. In a couple of cases the pin had seized in the bush, and the whole pin/bush was rotating in the housing - one of my knuckle bores was badly worn by that. Lesson learnt.

I will be replacing my SE's rubber bushes with a set of the SADFab poly/bronze bushes - polys with a bronze sleeve - the pin rotates in the bronze sleeve and the only job of the poly is to hold the sleeve in place. I'll do a thread when I do it.

For anyone wanting to learn more about bushings, especially delrin and poly/bronze, have a read of this. Unfortunately, you can't do the retrofit on Superpros, they use different bushing diameters.

[ManiacLachy]

Yep, bronze bearings for the win. Mine are getting close to going in!

I don't know why it isn't a more widely used solution, other than adding a little to the cost. Maybe it's not as practical as we're led to believe? greenMachine and I will find out soon enough I guess. We'll have to share notes.

Roadrunner, just be sure to grease regularly, maybe every oil change/3 months. Your's is a track car mostly now, right? Not so much for street & commuting? You should get a decent run out of those bushes. How does the ride feel on the polys compared to the rubbers?

[Magpie]

We'll have to share notes.

Can you include me please?

... just be sure to grease regularly, maybe every oil change/3 months.

That reminds me to do mine!

[Luke]

Oh. Polys eh?!
I found none of the pins came out easily, all required a hammer, some serious hammering. In a couple of cases the pin had seized in the bush, and the whole pin/bush was rotating in the housing - one of my knuckle bores was badly worn by that. Lesson learnt.

Yep same thing except mine were slightly stuck in after 3 rounds with Superpro.
I needed a hammer to get the pins out. No big blows required.
Energy Suspension ones were worse.
They pushed in by hand when they went in but did not want to come out after 1 round that easily at all.

And my super awesome home built setup I put on the front lower control arms of my car last September is still going strong.
I.L Bushings, with rear ones having a big metal washer and toilet cistern seal to stop movement.
Then again it has only done 1 track day since then. Time will tell.