Hey ho,

I've found a number of posts about the suspension knocking when turning, but mine is a little different.

I'm getting a knock from the rear offside (I think) only when I accelerate extremely heavily on a heavy gear change. Is this the same knocking issue that others are talking about?

It's a 55/STi

Thanks,

m

 

Mine knocks if I try and launch it !

It's the diff. carrier complaining I think, you can get a pair of lock bolts and some "pineapple rings" to sort the rear out.

HTH

dunx

 

Thanks for that dunx. I wondered if it was diff, but don't really know enough about them So, not a big problem then....

 

Only if you launch it alot !

LOL

I don't so haven't got round to doing the rear end mods mentioned.

However as it passes 400 bhp, and with a new "nasty" clutch in....

I expect it's a goer in the Spring !

dunx

t.b.h. It is likely to be a rear strut... they all do it, mine did till swapped !

 

hi m8 the knock that you are getting is caused by the diff cross beam bushes getting tired ,the have too much complience .when changing gear rapidly the beam moves upward and downward ,clonking against the body or the mounting bracket


this is how you cure the problem .fit the whiteline pineapple ring kit ,simple to do .hope this helps geo

 

Smart - thanks very much for the info and pictures

Would this be a warranty job though - this shouldn't happen should it?

 

How much is the whiteline pineapple ring kit? Does this replace the diff cross beam bushes or is it in addition to them? Is it easy to fit or does it require dropping the diff off the car?

 

They fit over and under the front cross beam of the rear axle. It can be done in situ in about an hour. They take the 'tramp' out of the rear axle assembly by eliminating rock or twist of the axle location.

They will transmit noise into the frame.

David APi

 

Got this noise aswell

 

You mean the rings will transmit noise David?

 

Yes the old NVH ( noisy viration harshness ) vicious circle, improve car, increase NVH.

I've just fitted up-rated engine/gearbox mounts to mine and it's quite noisy now !

dunx

 

Good noise though!
Dunx - I see from your Subaru pictures that you use performance friction brakes.
How do you find them?
Do you use Z compound?

 

Erm,

tbh it's whatever came in the box

BOB'5 might be able to tell you what he supplies as standard.

SORRY !

dunx

P.S. Awesome, cost the same as std. but on track they just STOP ! I was able to out-brake a classic running the same (std) STI Brembo set-up ! !

 

the pineapple bushes dont transmit that much more n.v.h ,because theres still a little complience in the poly type .theres a difference between engine and gear box mounts (heavy duty ie Hard Race type now that does transmit vibs into the car .theres a trade off between performance /handling and N V H,you cant improve one without loosing out on the other Thats Life cheers geo

 

It was just that first time out the whining from the gearbox came as a shock !

LOL

dunx

 

That's exactly the problem. The manufacturers go to great lengths to cut down NVH and the major units are all running on 'void ' bushes these days. A 'void ' bush is one where the rubber does not go all around the bush.

When you replace them with even full rubber bushes, let alone ' Neoprene ' ones, you immediately increase NVH.

All cars have diffs and gearboxes that make a noise, it is what transmissions do. What the manufacturer is trying to do, is prevent that noise being heard. As soon as you harden up the bushes the noise gets into the frame and can appear to be coming from just about anywhere.

Short shifters with hard bushes in do the same thing.

David APi

 

2-piece, patented floating design, curved vein with Z compound pads.

 

Cheers BOB'5 !

Saved me looking for the invoice !

LOL

dunx

 

Cheers guys.
Yeah, they are class!