sounds a bit daft but see when nailing it my car has started to do that banging up and down off the mark rather than screeching the tyres to fuck

it sounds/feels like the wheel bouncing up and down in the arch rather than planting 2 black lines??????????????/

ive got a full set of rear polyushes to go on+just fitted new coilovers

whats your views?bushes?

 

also got the dampers set quite soft for a long drive

 

I have been in a few 3 doors that do this....

back diff really bangs....

Not sure why though?

 

i rember it on old shonky fwd things when reving up and dropping the clutch,

 

propshaft bushes ?

 

Isnt that called tramping??? Something to do with dampers I think???

 

Its like axle tramp, diff bush and re newing any others should cure that.

 

opps just read it probably u say your back wheels are bouncing in which case what i said is complete bollocks no change there tho

 

the doughnut one that goes between box and prop?

i dont think so mate

 

on my old rst tubo it started to do it when i had the tracking done and got decent new tyres on it before it just used to light the tyres up and not really do it.i put it down to a bit more grip or tryes fitting for grip more as handle as still ok so not like a bush and suspension was all new and still took a beating everyday so didnt seem to be clutch or diff or gearbox as id have thougt they would have destroyed themselves if it was?
maybe you just got more grip now too

 

are the wheels still attached to the car?
checked your tyres?

 

saying that davie you could be right there as not reved to 6 and dropped it yet

at 4-5 the tyres could play a factor

 

Get yourself a rose jointed ZOO rear beam

I launch the fook out of the saff and it sticks like fook, nice black marks

 

i'd say tyres too. They have far too much grip to spin properly, no momentum in the car to get it going, so the only way the wheel can go is up!!!

Or am i talking shit

 

i know it probably sounds stupid but thats only thing i could explain it on the turbo.and it deffo had much more grip in dry and the wet i know its totally different on a rwd car so who knows?
who set up your coilovers anyway.was it just your mechanic?or you had it to clcm

 

I would say the new dampers are set too soft letting it squat more than before and loosing traction, try firming it up and see what happens.

 

What other weather conditions did u try it in if they were the same?

 

just meant from before the fooking tyres and tracking were done.
oh and also tried it in the snow

 

Tramp tastic, assuming bushes are ok this is your problem. Turn them up one click at a time untill it stops. I lunched a diff through tramp on really soft dampers.

 

could also be worn trailing arm bushes....as staffi said, get a rose jointed beam, or new standard ford bushes in there

 

My saph used to do this !

Chucked a diff out the rear cos it aswell !

I'd go wit the dampers too, cos I stiffened mine up on the rear & checked the tyres (one tyre was almost flat ) & she was fine after that !

Get the bushes fitted too !

jb

 

Check the rear diff mount bush, if it's fucked, the diff will rock back and forth in the rubber. This is what the poly diff mounts are for .

 

Or sh*t loads of silicon sealer ! ! !

Not that i'd do that ! (any more ! but it did work ! )

jb

 

And if the diff mount is on the weak/worn side DONT fit a welded diff cos it'll kill the mount in minutes ! ! ! I didn't do that either !

jb

 

cheers guys il stiffin the dampers up fit my new bushes and get an uprated diff mount i think

 

just to add..dont fit polybushes to the rear arms....you might think you are doing upgradings but you will be doing downgradings

standard ford spherical bearings only for rear arms

 

hmm mine bangs at the rear sometimes maybe i will fit one of these uprated diff bushes do they come ready to fit?i.e unbolt rear mount,bolt up new one??where u get them from?

 

cheers kev

 

Why use spherical bearings? whats wrong with poly?

Dan

 

because there is no way a piece of injection moulded plastic can keep the rear arms where they should be as well as a high quality OE spherical joint

polybushes are ok for some applications...just not cosworth rear arms

 

mine also does that every now and then was also told dampers may be the problem

 

I get ya cheers

Dan

 

are these the big rear bushes that are a cunt to fit anyway

 

Suspension wise I think my 'grp A' diff hanger is one of the best mods ive done.....huge improvement over the blomonge effort that Ford gave us

 

no those are the ones in the rear beam, the polybushes are a good upgrade for those, not too bad to fit once you cut the old ones out get a lenth of m12 threaded rod and screw it into the bolt hole , shove a block of wood between thebeam and chassis leg , lube the bush up well and slide bush up the rod chuck a couple of big washers on it then tighten a nut up on the rod and the bush will pull /pop into place

 

or...use the right tool....altho tbh I bet you cant even buy them now can you?

 

dunno probably not lol, i made one about 15 years ago for doing them with the beam off the car but find the threaded bar method works fine

 

where u get these from chap as mine bangs sometimes

 

From Mike Rainbum

 

cheers neil a.....very nice how much mr rainbird????