Miks15
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| posted on 8/2/08 at 03:41 PM |
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BMW suspension
I have just taken the suspension off my bmw and have realised that the upright is not like a cortine or sierra (doesnt have anything for the top ball
joint to fit into.
 
These are my uprights and as you can see the top mounting point and the two holes in it are for the shocks to attach onto it.
So my thought is this...
Can i make a bracket which bolts onto the tow middle holes and also onto the top one which will then allow a ball joint to be put through the top.
Has anyone had anything else like this before?
Does the hole for the ball joint need to be tapered?
Anyones views would be much appreciated
CHeers guys
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02GF74
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| posted on 8/2/08 at 04:08 PM |
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that' unfortunate.
Do you really have to use them?
I daresay you culd make a braket using the two holes and then bolt up to the horizontal upright hole (as in your pic), then bolt on a ball joint.
How easy, accurate and safe it will be aI cannot say.
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Mr Whippy
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| posted on 8/2/08 at 04:14 PM |
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I don't think that one is really suitable for this application. Unless that is, you can use the part that it bolted on to (modified off course)
as part of the setup
what does that part look like?
yes the balljoint should be tapered and about 10mm thick.
[Edited on 8/2/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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andyharding
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| posted on 8/2/08 at 04:19 PM |
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Don't see what the problem is, why not just use a rose joint instead of a ball joint bolted horizontally through the hole?
Are you a Mac user or a retard?
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Miks15
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| posted on 8/2/08 at 04:24 PM |
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the rose joint wont give me enough turn though surely?
I did think about it but i didnt think it would provide enough momevent for full lock
But mabye theres another way of using a rose joint instead of a ball joint?
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chrisg
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| posted on 8/2/08 at 04:43 PM |
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Something like this?
Cheers
Chris 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Mr Whippy
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| posted on 8/2/08 at 04:49 PM |
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that looks good problem solved
[Edited on 8/2/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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James
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| posted on 8/2/08 at 05:09 PM |
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Nice one Chris!
That upright 'looks' like it weighs a lot less than Sierra.... is that right?
cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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chrisg
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| posted on 8/2/08 at 05:18 PM |
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Yes it's lighter, about 900g
I've just noticed that it's held on with special bolts with eight flats on the head, I'll sus this drawing lark one day!
cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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James
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| posted on 8/2/08 at 05:34 PM |
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Presumably then subtract the weight of the adapter from the 900g right? 
Sorry, just checking!
Didn't even notice the bolts.... I'm sure Mclaren use bolts with more flats than normal.... so yours *must* just be more special!
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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chrisg
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| posted on 8/2/08 at 05:48 PM |
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Yes I'm "special"
cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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bonzoronnie
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| posted on 8/2/08 at 07:20 PM |
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quote:
Originally posted by chrisg
I've just noticed that it's held on with special bolts with eight flats on the head, I'll sus this drawing lark one day
I thought they were Torx bolts
Ronnie
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chrisg
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| posted on 8/2/08 at 07:25 PM |
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Yes that's it!
Torx bolts, not a cock up.
Yes, good thinking
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Miks15
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| posted on 8/2/08 at 08:49 PM |
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Chris thats brilliant
I was thinking something like that all though my drawings skills couldnt quite match.
Or something lff to the side of the mounting point.
Does it matter if the two wishbone mounts are directly above each other?
Does the balljoint mount need to be tapered?
Thanks for the good response... why i love this place
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James
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| posted on 8/2/08 at 09:07 PM |
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quote:
Originally posted by Miks15
Does it matter if the two wishbone mounts are directly above each other?
Does the balljoint mount need to be tapered?
Yes, because this is what forms castor. You need this if you want any form of self centring in the car! With 'Escort width' wishbones you
need 22mm castor (top trailing bottom). With 'Sierra width' I believe it's 25mm.
Yes, if you're using a balljoint that is tapered! So if it's a Transit BJ as in 'The Book' then it needs to match the
Transit BJ taper.
Hope that helps,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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Miks15
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| posted on 8/2/08 at 09:13 PM |
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so let me just get this straight.
The top mount needs to be about 25mm behind the bottom mount?
Can you get balljoint whichs arent tapered?(this would make my life easier)
If not whats the easiest way to get a tapered hole?
Thanks again
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chrisg
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| posted on 8/2/08 at 09:30 PM |
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You're right, the top mount needs to be further over like this
So that you can get the castor right.
cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Miks15
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| posted on 8/2/08 at 09:37 PM |
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thanks again chris.
BUt im a little confused as too how much castor it needs?
Does it need to be one directly above the other? or does it need to be slighty off center?
cheers
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JoelP
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| posted on 8/2/08 at 09:41 PM |
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top behind.
chris, your first one was ok because you can just tip it back to get the correct angle. Having the steering arm a bit up or down wont have much affect
here.
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Miks15
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| posted on 8/2/08 at 09:51 PM |
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how far does it need to be behind?
Why exactly does the castor need to be set like this?
thanks
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chrisg
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| posted on 8/2/08 at 09:52 PM |
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Between 5 and 8 degrees is usual, you really need a program like Susprog to work it out or copy a set-up that you know works well.
Cheers
Chris
EDIT:Castor provides self centring for the steering, without it the steering would feel very strange indeed
[Edited on 8/2/08 by chrisg]
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Miks15
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| posted on 8/2/08 at 10:01 PM |
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OK i think i get it now.
Thanks for all the help
very much appreciated.
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chrisg
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| posted on 8/2/08 at 10:04 PM |
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Have a look at this, it might help
castor
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Miks15
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| posted on 8/2/08 at 10:11 PM |
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thanks again chris been a great help all night
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James
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| posted on 9/2/08 at 12:12 AM |
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quote:
Originally posted by Miks15
thanks again chris been a great help all night
Somehow.... "ChrisG" and "all night" aren't two phrases I generally associate together! 
[Edited on 9/2/08 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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