robl

iTrader: (30)

just need to know as my bc coilovers br series on left side are making some horrible thud noises while going over only minor ridges/pot holes.

any ideas what i can check myself? going to have a look today before work?

I only recently changed them from 27 from hard to 18 from hard in the last week and upped my winter tyres pressure to 40psi.

on the way home this morning dropped psi to 25 but still getting 'thuds' on the left side only.

Saalro

iTrader: (8)

If it's not the anti roll bar links or bushes, then maybe the BC top mounts, BC's are known to knock. But it could at a push be a drive shaft, although this is more on and off of power.

Thanks
Sam

scoobynewbie72

iTrader: (1)

From history the BC`s are known for it.

dazdavies

iTrader: (22)

Mine are also doing it on the left rear too. So I will be interested to see how you get on. As soon as I iron out post rebuild niggles it's going up to BC for them to look at it.

rickya

iTrader: (18)

Are they adjustable rears or std rubber top mounts?

bigarf

iTrader: (67)

mine used to do it awsell.hence why i'm now running teins again.

dazdavies

iTrader: (22)

Mine are adjustible solid top mounts.

robl

iTrader: (30)

thx for all tips, i will check everything when i get a day off work.

Anyone recommend a good suspension garage? I don't mind travelling for the right place.

rickya - "Are they adjustable rears or std rubber top mounts?" Not sure as they were on the car when i bought it. The car was mega low when i got it - ie rear arches rubbing on cornering, front wheels catching on arches before you get full lock. so a few months back i raised the rear suspension by 1 inch. The previous owner also had put on 18x8 wheels but I now have my winter wheels on that are 18x7.5 which made a good difference - no more rubbing on tyres.

It feels like one of the shocks has died, as even minor dips in road where theres a small damage to tarmac u feel a good bang through the car on that side.

I've had the spring twang before after hard cornering.

beliblisk

iTrader: (16)

Did you check top mounts screws.Since they are metal and if not fully tightened mouts might hit agains chassis,metal on metal sound. I have RM series with fully adjustable top mounts and mine knock only when hitting some major pot hole which is understandable.

rickya

iTrader: (18)

I would change the rears top mount section to std rubber ones and see If it improves.

robl

iTrader: (30)

beliblisk - yes I checked top mount bolts and all are tight on all 4 sides. Its only recently about a week after adjusting them to 16 clicks from soft that it started happening.

I have just gone now to 7 clicks from soft on all 4 corners and it has improved a little. I also removed front upper strut brace today that i fitted a few weeks back, i'll see if it improves on the way to work today.

rickya - thx for the tip but I think I'm best taking it to a garage to have a look at.

The rear strut top adjusters have remote adjusters, could one of these be bad and so maybe set on hardest setting constantly?

Markyscoob

If you feel a click as you adjust then they are fine.

Have you checked the bottom mounts? the spring seat and preload, etc.

Rubber mounts use a conical spring not a parallel one, but Apex have all these in stock.

robl

iTrader: (30)

I'm thinking its the front passenger side shock as when you press down on car and release its really very firm, no bounce at all.

Markyscoob - yeah i can feel a click when adjusting. I've got a mechanic friend coming round tomorrow to have a look, i will mention bottom mounts, the spring seat and preload, etc. cheers

robl

iTrader: (30)

just looked today and theres alot of oil around area of strut so looks like it needs a rebuild.

thx to all that replied for the help.

madfiddler

Sorry to bump such an old thread, but thought I'd chip in.

This has been happening to mine from day 1. I asked the guys from API to check and they said it's fine, but I still shudder when ever I hit a pot-hole. The bang is so loud. A friend suggested that perhaps the surface is hitting the rim? My tyre pressures are fine.

fat-thomas

iTrader: (4)

easy fix.

bin the cheap chinese ****.

fawor

iTrader: (3)

stop eat and talking ****e
few forum members swap ast for bc and saying bc's are a lot better on road
last review which i read was from member with 537bhp hatch sti

the shreksta

iTrader: (20)

Why does he have to stop eat???

Cpt Jack Sparrow

iTrader: (14)

'Cos he's Fat

BrownPantsRacing

iTrader: (6)

Maybe Flawor was telling his old mate Tubs to stop and eat. It's hard to know.

madfiddler

Mmmm, I can't really afford to throw them away. From a handling point of view they have certainly improved the car imo, it's just the pot holes... or even bumps in the road which sound like I've just driven over a curb...

fat-thomas

iTrader: (4)

ive had them and like your wrx they are cheap nasty sh1te.

madfiddler

Really not helpful! I was asking a serious question.

fat-thomas

iTrader: (4)

its a serious answer they knock and bang due to being cheap chinese crap.
live with it or buy better quality coilovers

madfiddler

I don't for one minute believe that API would sell me 'cheap chinese crap'.

So, I'm presuming that the bang is not the road surface making contact with the wheel rim then?

fat-thomas

iTrader: (4)

Usually top mounts in my experience of bcs

madfiddler

OK, thank you. Can this be fixed at all?

fat-thomas

iTrader: (4)

I never found a cure,reset preload,checked,had geo done.
But to be fair coilovers aren't a great choice on the road no matter what make.
The biggest issue I found with bcs was they are silly bouncy even on softest setting on country roads.
OEM shocks and lower springs are a far better combo for the road.

madfiddler

OK thanks for that.

BrownPantsRacing

iTrader: (6)

I have to agree with Tubs. This is why I stuck with OE shocks with decent lowering springs on my every day road car.

I have owned lots of cars road or race with coilovers and none were great on the road.