kango
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| posted on 12/10/05 at 05:32 PM |
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Are you sure it is not easier to make the IRS wishbones and have everything adjustable?
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Ben_Copeland
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| posted on 12/10/05 at 07:10 PM |
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Well it would involve lots of mods to the chassis, plus if you dont get it set up right and the wishbones in the right position the handling with be
awful. You can really go wrong with live/de-dion axle.
Ben
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DAN57
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| posted on 12/10/05 at 08:38 PM |
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Dare I say I have a friend with a 1.7 X flow Caterham. (Am I allowed to say that here?) He has a live axle set up and does around 59sec laps at
Brands, not sure how quick that compares but was about 5 seconds a lap quicker than another friends £25k track mk1 Golf gti which is a lot. I must
admit I am now converted away from the irs idea and beleive if any real gain is apparent whether it is worth all the extra work and fabrication. IMO
anyway.
I don't normally venture to that neck of the woods Ben, but will definately let you know if I do. Thanks for offer.
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kango
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| posted on 13/10/05 at 04:15 AM |
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It is just the lack of proven drawings that put me off.
If you can manufacture front wishbones, why will the back ones be more complicated?
If you can fit the front wishbone brackets to a tapering frame, why is it so difficult to fit ir to the rear frame where things are a little more
sqare?
Remember I will be building my own chassis.
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Mix
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| posted on 13/10/05 at 06:14 AM |
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Don't be put off by the lack of drawings
There are quite a few of us on here doing our own thing with IRS. As you say it's relativley easy to construct.
My approach was to sit down and read as much as I could about IRS, then apply what I'd read to my build.
In the process I've learned to use CAD, (albeit not to it's full potential) which has come in useful in other areas on the car.
Go for it 
Mick
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907
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| posted on 13/10/05 at 08:36 AM |
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quote:
Originally posted by Mix
Don't be put off by the lack of drawings
There are quite a few of us on here doing our own thing with IRS. As you say it's relativley easy to construct.
My approach was to sit down and read as much as I could about IRS, then apply what I'd read to my build.
In the process I've learned to use CAD, (albeit not to it's full potential) which has come in useful in other areas on the car.
Go for it
Mick
I totaly agree with Mick, well, until you get to the bit about learning to use cad.
My post would read, "In the process I failed to learn how to use cad".
Instead, I drew it out on a sheet of ply, and used strips of cardboard to represent
the wishbones, with panel pins as the pivot points. Sad I know, but us "old 'uns"
have trouble getting our heads round this new fangled technology. 
I have made one "boo boo" though.
I'v used poly bushes inboard, and rod ends outboard, and I wish I had used rod ends
with a fine thread, instead of metric coarse, to give more scope for adjustment.
Paul G
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kango
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| posted on 13/10/05 at 06:26 PM |
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Did you use differnet length upper and lower wishbones?
what was the lengths you used?
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907
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| posted on 13/10/05 at 08:33 PM |
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Hi Kango,
Top one is a book front (top) but without the offset for caster.
Bottom is about twice as long.
It does depend on the length of the rod ends though.
I can measure exactly if you like in the morning.
HTH
Paul G
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kango
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| posted on 14/10/05 at 04:23 AM |
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Would be appreciated.
do you have some photoes of your set up?
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907
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| posted on 14/10/05 at 07:02 AM |
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Hi again Kango,
As set up at the moment, from the centre of the eye of the rod end,
to the centre of the w/b pivot (poly bush) is:-
top w/b 240mm (+ or - 15 adjustment)
bottom w/b 425mm (+ or - 15)
note: these dims do depend on the design of the upright, i.e. flange face to r/e pivot.
There are pics in my archive (irs rear & rear w/b's)
The top bracket rail with the shaped cut out for the d/shaft is made from 3mm wall.
atb
Paul G
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kango
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| posted on 14/10/05 at 06:35 PM |
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WOW !
What coating is on your chassis?
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907
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| posted on 14/10/05 at 11:23 PM |
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Dust
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Ben_Copeland
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| posted on 15/10/05 at 07:22 AM |
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Dont forget the stainless effect 
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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