twinturbo
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| posted on 17/8/04 at 05:29 PM |
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fao Graceland.. Sierra IRS brainstorm...
Hi Paul..
Took some Images of the rear Beam in the general position I intend to mount.
As you can see the axle line is a bit further back, you can move it forward but would need to modify the tubes arround the rear of the tranny tunnel..
The chassis is resting about correct ride hight so there will be a bit of camber alraeady ( nothing we are not used to on the sierra. ) Although this
is with 16" rims
I have still to work out the rest of the rear end support...
I know it's not elegant but I am trying to keep cost down... Pulled from spares cupboard..
TT
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Graceland
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| posted on 17/8/04 at 05:33 PM |
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nice one rob - cheers, not overly happy about having the mounting pieces sitting below the floor level tho - maybe thats something i will work on
while designing the rear ennd of my chassis 
cheers m8
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JoelP
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| posted on 17/8/04 at 05:39 PM |
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this is very similar to the setup i have ended up stuck with. Points i would mention, is that its a bloody heavy subframe! and on mine, i have ended
up with excessive camber, and i mean shitloads of it... its gonna go thru tyres fast.
aside from that, it does save a lot of effort.
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Graceland
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| posted on 17/8/04 at 05:44 PM |
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ya got any pics please joel?
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JoelP
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| posted on 17/8/04 at 05:50 PM |
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sorry, no camera! i mounted mine a bit further back, with the two donut like things about 3 inches behind the panel behind the seats. only other
mounting point is the bolt on the back of the diff. think mine was too low here, hence the shady angles. then just welded brackets directly onto the
trailing arms, for the coilovers. it works, but it wont contribute much to handling...
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Graceland
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| posted on 17/8/04 at 06:07 PM |
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d'oh - i'm sure i'll nock summat up with not much problem
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twinturbo
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| posted on 17/8/04 at 07:01 PM |
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Performance Sierra owners are used to too much camber...
Decambering is possible, with shimming
TT
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andyps
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| posted on 17/8/04 at 07:58 PM |
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There is a good diagram on the locost car club site shwoing how to mount the complete sierra rear suspension unit on a book chassis
link here
Andy
An expert is someone who knows more and more about less and less
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dblissett
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| posted on 17/8/04 at 08:42 PM |
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irs
i tried this as my first attempt at irs on my car
i scraped it because the car looked out of proportion and the rear wheels looked to far back
finally as joel says this tube is bloody heavy
if i was to do my back end again and i am not because its took three different designs to get it right ( and delayed me 10 months) i would spend my
money on a gts dedion
when you go off book its a whole can of worms
ps have a look at the thread suspension book
cheers dave
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twinturbo
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| posted on 17/8/04 at 09:08 PM |
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Andy:
The Diagram is ok, but does not actualy give any info or dimensions that are a revelation..
In fact it's missing a whole load of dimensions of any use..
Dave:
I am fully aware it's not ideal, but this is a first build "mule" to test ideas on..
The next chassis will be the Mcsorley long'n'wide with dual wishboned rear.. But that's some time off..
TT
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givemethebighammer
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| posted on 17/8/04 at 09:20 PM |
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take a look at a tiger cat they use the entire rear beam. Also the camber can be removed by fitting camber wedges (rs jigtec used to sell them for £25
a pair). Seem to indicate a 2 degree wedge . someone on here must be able to make these ?
the rh people had this info
http://community.rhocar.org/index.php?showtopic=1197
 
Rescued attachment post-5-1060635347.jpg
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dblissett
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| posted on 17/8/04 at 09:22 PM |
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chassis
iirc the plans for the sierra torque tube are to suit a 46" wide chassis
ie a plus 4 chassis
and yes lots of the dimentions are missing
have a good luck at a robin hood they do the same kind of thing with the 2b
but watch out the robin hood is a bit wider than 46" i think its about 48/50"wide
cheers dave
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MikeRJ
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| posted on 17/8/04 at 09:41 PM |
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If you are happy to go with a semi-trailing arm setup, then surely ditching that boat anchor of a tube and putting brackets directly on the chassis
(with suitable reinforcing) is the way to go? Would also mean you can dial out the static camber by placement of the brackets.
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twinturbo
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| posted on 17/8/04 at 10:22 PM |
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The plans are for the book chassis.
I had considered dumping the tube and just using the trailing arms.. This is an idea I may look at further.. The beam does incorporate some cushioning
but prehaps this will not be missed on the locost.
It would certainly add more scope for location of the suspension. And the inner mounts are incorporated with the diff carrier so only the outer ones
would be required.
TT
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stephen_gusterson
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| posted on 17/8/04 at 10:27 PM |
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when I looked at trying to use the sierra irs, mounting the big front tube mounts to the flat floor would have created a really big ride height.
if you look at pics of the robin hood 2b chassis, you will see they are recessed.
atb
steve
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Hugh Jarce
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| posted on 18/8/04 at 06:15 AM |
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I am tipping that can of Hyper Clean doesnt see too much use around your pace. Same with the broom and shovel!
The pay isn't very good , but the work's hard.
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twinturbo
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| posted on 18/8/04 at 06:34 AM |
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Hyperclean get's used evertime I am in the garage..
It's in a bit of a state at the moment. Not had any time to tidy up let alone work on the car.. And that garage is packed full...
1x Cosworth 24v
1x dismantled crossflow
1x dohc head
2x 4x4 sump
2x sierra fuel tank
2x Xr4x4 box
2x sierrea beam
3xsierra front diff
1x escort Box
12x alloy wheel + tyre
welder
compressor
crane
tools
8 cans spent oil
6 sets sierra suspension
4 sierra wishbones
4 front driveshafts..
2 steering racks
sierra 4x4 transmission tunnel
r/c plane
Diff
and that's just inside.....
2 vw engines outside
another box.....
etc...
And the Locost is not even supposed to be in the garage....
That's wher the prime project is supposed to be..
TT
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twinturbo
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| posted on 18/8/04 at 06:41 AM |
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What hight should the chassis be off the ground?
TT
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JoelP
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| posted on 18/8/04 at 06:53 AM |
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mines 4 or 5 inches. cant remember!
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twinturbo
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| posted on 18/8/04 at 07:26 AM |
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Ahh,
It's sitting 7" at the back and 6" at the front at the moment..
Camber at the back would be much worse witha 3" drop..
Think I will look at refabricating the mountings into the chassis and dispensing with most of the beam. Seems like a decent compromise.
TT
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stephen_gusterson
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| posted on 18/8/04 at 08:58 AM |
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my highly non std not-a-locost car is approx 8 ins off the ground. It looks ok on a 30's - 40's sports car replica, but would look like a
land rover version of a locost if used on a 'book' car
atb
steve
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MikeRJ
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| posted on 18/8/04 at 09:55 AM |
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Have a look at Spags "Pievan", a mini van with a mid mounted Rover V8 and using Sierra-esque rear suspension. He has actually fabricated
his own trailing arms based on the Sierra items:
http://www.spagweb.com/v8mini/pievan/sub_2.htm
Rest of the site is well worth a browse!
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stephen_gusterson
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| posted on 18/8/04 at 10:28 AM |
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I did something similar, but much more beefy than that.
looks to me like the hubs might tend to fold inwards. Mine was braced with 5mm plate onto 50mm arms
cant say they will ever fail tho - makes the 16mm rose joints look whimpy tho
atb
steve
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James
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| posted on 18/8/04 at 10:42 AM |
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TT,
Deepest sympathies... I hadn't realised you lived in Boscastle!
Atb,
James
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twinturbo
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| posted on 18/8/04 at 11:55 AM |
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Actualy the lower weather strip on the garage lets in water during heavy rain..
Not quite a torrent like BC though...
TT
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