Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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I just put on lower rear springs but now when i go over speed bumps i hear a knocking sound, any idea how can fix this. it only happens whe i go over bumps if i jump on the back cant hear anything! Help!!
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scotty19
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Registered: 2nd Jan 03
Location: Warrington
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It will be your exhaust banging on your axle, mine does this, what u need to is get a pair of good quality exhaust rubbers and this should stop it .
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PeteMTBer
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Registered: 25th Mar 02
Location: Home: Brampton, Near Carlisle, Cumbria.
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Its a pain in the arse innit mate.
I'm down 60mm and it rattles even with stuff in the boot let alone 3 people in the back.
It is the exhaust rattlin on the axle like scotty19 said.
Try and raise your backbox as high as possible.
If all else fails get a custom system built on your car.
Pete
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moddedcorsa
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Registered: 15th Aug 02
Location: Argyll, West scotland
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first try turning the clamp that holds the backbox. this should sove the problem
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ally denton
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Registered: 31st May 03
Location: stonehouse, scotland
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have you tightened the 17mm nut and bolt at bottom of shock properly???
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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yeah, but i think i know what it is, does the spring have a gulley to sit in so the end of the spring is supported. similar to the front spring. cos it doesnt have one at the bottom but does it have one on top?
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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quote:
Originally posted by scotty19
It will be your exhaust banging on your axle, mine does this, what u need to is get a pair of good quality exhaust rubbers and this should stop it .
this is wierd, ive never had this problem and mines down 60mm
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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I had this problem as well......it requires a big peice of Foam or rubber being wrapped around the axel at the point where the exhaust is striking it.
Also, rotate the clamp
Matt
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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itsnot the zorst, i had it raised oop last night and it soonds like its comin from the springs the coils are touching eash other on full compression. is this norml ir have i got dodgy springs? will uprating the dampers help it any??
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TOMAS
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Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Its VERY normal for coils to touch, dont worry. That could cause whats known as spring chatter but its nothing like a BANG!
You sure you fitted the bumpstops back on the dampers, otherwise it will 'bottom out' metal on metal.
Last real thing would be the exhaust as mentioned above. To fix that forget all your foam tricks and go find a garage with a blow torch, simply heat up the bend until it glows then carefully just put a slight bit more bend on it, just enough to give you clearance, then hold it their and blow on it to cool it and set it in its new position. Moving the clamp around sometimes helps too.
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StuartGee
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Registered: 10th Dec 02
Location: Ellon, Aberdeenshire
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Same prob, but local mechanic said he reckoned it is the rear brake bias valve, you know that little shitty spring thing on the rear axle. But if it was that, I would be locking up the back all the time, and I aint!!! Hmmmmmm, I wonder!!
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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i aint got one of them cos i got a 1.2
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TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
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U sure? my 1.2 16V GLS 5door has one... Maybe just because its a 5 door like? Dont think that would make a bang, its on a spring anyhow.
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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definately dont have one, 1.2 8v has valves in the brake lines.
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ajscorsa
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Registered: 30th Apr 02
Location: Perceton, North Ayrshire
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my 1.2 8v has one 
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Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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we are talking about the rear brake compensator, the thing you have to mod if you are dropping your car any more than 60mm. maybe its just my car but i dont got one. vauxhall told me it was only on the 1.4 and upwards
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TOMAS
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Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Forget all that, it aint your problem... its something else...
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Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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it looks as if the spring coils are actually comng into contact wit each other is that common on spax 40 mm drop springs with standard dampers?
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jjcymru
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Registered: 28th May 02
Location: ammanford,south wales
User status: Offline
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did you fit shortened shocks?
are the coil ends on the stopper bit on the spring seat?
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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no not yet. standard shocks, there isnt any stopper bits on the rear of my motor
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jjcymru
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Registered: 28th May 02
Location: ammanford,south wales
User status: Offline
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you just answered the problem i think
theres meant to be a cup on the beam with a stopper in it to stop the spring going round in circles
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Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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nope wasnt there when i took the old spring off and put he new ones on. all there was was a rubber protector on te top and a metal washer thing on the bottom.
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