when you wheel spin why does it thud?

[magpie]

get some rear bush void fillers as they cut down on the movment/play in the beam.

danthe did a group buy ages ago on them.

they definetly work and cut down on the "ddddd ddddd ddddd" lol from the back end.

decent rear end bushes and void fillers is about as good as you are going to get to stop the odd noises even a good e30 will make under use.

cure-anti trampness'm.buy the time you've stopped this once in a weekend hop thing.for the car you're going to need anti camber,lsd
and all the garage Queen shoooZle that it comes with>or obey the fuel econ gauge

[bss325i]

cure-anti trampness'm.buy the time you've stopped this once in a weekend hop thing.for the car you're going to need anti camber,lsd
and all the garage Queen shoooZle that it comes with>or obey the fuel econ gauge

so why the gerry tramp?

loss of traction upon bite= mas rear bush stress the time you've spent Bunny hopping


i had this in a twin wheel luton once

[mc_hawkings24]

Anti tramp bars are we talking the cross braces that connect the live axle to the leafs to stop it steering the rear?? like you can buy for mk2 escorts capris etc?

i know a few people who've done there diffs at santapod as the floors so sticky

[harry_p]

It's just the tyres gripping / slipping at a frequency the dampers can't cope with which leads to wheel bounce which exagerates he probem.

A car with brand new bushes, springs, dampers and tyres can on occasion do it so it doesn't always mean somethings knackered, although sloppy bushes are almost certain to make it worse. Likewise, new or updated bushes might solve the issue by shifting the frequencies and resonances.

It's called axel tramp as a general term for it, although it is different to the wind up and unloading of a solid axel cart sprung car.

Quite a few fwd cars do it too, even from brand new. the Clio 172 was well known for it

[magpie]

cure-anti trampness'm.buy the time you've stopped this once in a weekend hop thing.for the car you're going to need anti camber,lsd
and all the garage Queen shoooZle that it comes with>or obey the fuel econ gauge

so why the gerry tramp?

loss of traction upon bite= mas rear bush stress the time you've spent Bunny hopping


i had this in a twin wheel luton once

what's with the finger?

i've only hopped a twin wheel luton with no pay load in the back.
so does that make my car good or bad in you're book?
tramping is an issue and clearly one ford sorted.
did the "GEMRANS" not resolve this?

i thought they were the most efficient Race

[bss325i]

Anti tramp bars are we talking the cross braces that connect the live axle to the leafs to stop it steering the rear?? like you can buy for mk2 escorts capris etc?

i know a few people who've done there diffs at santapod as the floors so sticky

Anti tramp bar.

[Kos]

i think i have the complete motorsport catalogue on CD somewhere

[bss325i]

i've only hopped a twin wheel luton with no pay load in the back.
so does that make my car good or bad in you're book?
tramping is an issue and clearly one ford sorted.
did the "GEMRANS" not resolve this?

i thought they were the most efficient Race

Ignor the finger, there is no SPEAK ENGLISH emoticon without the finger.

Do you have a problem with Germans?

[bss325i]

i think i have the complete motorsport catalogue on CD somewhere

Copy please!

Ace tomorrow?

[magpie]

i've only hopped a twin wheel luton with no pay load in the back.
so does that make my car good or bad in you're book?
tramping is an issue and clearly one ford sorted.
did the "GEMRANS" not resolve this?

i thought they were the most efficient Race

Ignor the finger, there is no SPEAK ENGLISH emoticon without the finger.

Do you have a problem with Germans?

#

9

[mc_hawkings24]

Anti tramp bars are we talking the cross braces that connect the live axle to the leafs to stop it steering the rear?? like you can buy for mk2 escorts capris etc?

i know a few people who've done there diffs at santapod as the floors so sticky

Anti tramp bar.

i see well if you didnt have that it would steer all over the place still needs the braces to make it straight. nissan micras have that sort of setup ie floating beam with panard bar.

cossies have this tramping problem badly and thats irs


ps: i have a german surname

[magpie]

micras

[gareth]

anto tramp bars can only work on a live axle as it can wind the springs into an 's' shape. the addition of horizontal bars will force the axle to move up and down in a parallelogram fashion. the E30 arms only have one pivot axis so can only move in an arc, so fitting an anti tramp bar will stop the trailing arm moving at all.

incidentally, with poly rear subframe bushes and leda coilovers (with rose jointed ends), my car doesn't tramp at all.
it did before though and at santa pod when it had the ledas but normal rubber beam bushes, i got axle tramp which promptly blew the diff

[Jimbo2006]

It's just the tyres gripping / slipping at a frequency the dampers can't cope with which leads to wheel bounce which exagerates he probem.

A car with brand new bushes, springs, dampers and tyres can on occasion do it so it doesn't always mean somethings knackered, although sloppy bushes are almost certain to make it worse. Likewise, new or updated bushes might solve the issue by shifting the frequencies and resonances.

It's called axel tramp as a general term for it, although it is different to the wind up and unloading of a solid axel cart sprung car.

Quite a few fwd cars do it too, even from brand new. the Clio 172 was well known for it

+1

Knackered bushes just make it worse, mine does it occasionally with all new polys, dampers etc.

Can occassionally read about it in the road test of a brand new car, rarely now but more so say 10 years ago when suspension design was less developed.

Horrid sounding noise though eh...

[da4x4turbo]

My sport used to do this. I replaced the top-mounts, polybushed the whole rear end including the diff bushing and now it doesn't do it anymore.

I'm going to have to increase the side profile of my tires now though to try and mitigate the effect of the extra hardness of the poly bushes. i.e. I'm hoping the sidewalls will absorb some of the extra "new" vibrations transmitted to the car through the new bushes.

I was going to increase the sidewall height anyway, and now I have a second reason.

As for polybushing.... Mixed reactions from people on here as to whether they're a good thing or not. Plenty of valid reasons for both opinions. If my car was a daily driver I'd take them out again. But it's not, so I'm happy out.