Bob C
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| posted on 19/11/03 at 12:52 PM |
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"long" coilover shocks for IRS
Gents,
I'm intending to use mazda mx5 rear uprights on an IRS locost. On the donor car the spring/damper bolts to the bottom wishbone. I can do that
but would need a very long unit! Where should I look for such an item? I need to connect to the proper top mounting as that's what the whole
chassis design is aimed at.
Alternatively I could extend the caliper bracket to pick up the shock mounting, but the bolts are well inside the wheel so it soes not look nice.
If I pick up the top wishbone instead (like everybody else) I'll be compressing the top rubber thingy in a way it was not designed for - and -
you guessed it, the rubber thingy is in the upright, not the wishbone.....
Ideas, URLs etc. welcome!
Thanks
Bob C
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jcduroc
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| posted on 19/11/03 at 03:24 PM |
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quote:
Originally posted by Bob C
Gents,
I'm intending to use mazda mx5 rear uprights on an IRS locost. On the donor car the spring/damper bolts to the bottom wishbone. I can do that but
would need a very long unit! Where should I look for such an item? I need to connect to the proper top mounting as that's what the whole chassis
design is aimed at...
Thanks
Bob C
Bob
Why not bolt the upper shock joint to a properly designed triangulated chassis apex?
Joćo
 
Rescued attachment WESTFIELDSPORTSCARREARSUS2.jpg
JCM
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jcduroc
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| posted on 19/11/03 at 03:28 PM |
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...or this
 
Rescued attachment TritonIRS.jpg
JCM
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jcduroc
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| posted on 19/11/03 at 03:33 PM |
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...or this
 
Rescued attachment Striker_RrSusp2.jpg
JCM
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jcduroc
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| posted on 19/11/03 at 03:52 PM |
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If I'm not mistaken this is the MX-5 rear susp...
 
Rescued attachment REARTHU2.GIF
JCM
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jcduroc
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| posted on 19/11/03 at 03:53 PM |
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...and this is MK rear susp
 
Rescued attachment RearUpRight.jpg
JCM
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Metal Hippy
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| posted on 19/11/03 at 03:54 PM |
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JC... Are pictures 2 and 3 as easy to make as they appear to be...?
Cock off or cock on. You choose.
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Alan B
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| posted on 19/11/03 at 04:28 PM |
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With access to right tools, sure why not?
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jcduroc
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| posted on 19/11/03 at 04:34 PM |
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quote:
Originally posted by Metal Hippy
JC... Are pictures 2 and 3 as easy to make as they appear to be...?
I guess it is not more difficult (or easier) than putting the coilovers on the top of the uprights!
Alan's got a point there. I'll be sure within a few months (hopefully!).
Joćo
JCM
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Metal Hippy
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| posted on 19/11/03 at 05:05 PM |
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Well it looks like I've found out what I wanted.... Hoorah!
Cock off or cock on. You choose.
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Noodle
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| posted on 19/11/03 at 05:18 PM |
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quote:
Originally posted by jcduroc
...and this is MK rear susp
Picture 2 is also MK Indy rear.
Neil.
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jcduroc
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| posted on 19/11/03 at 06:49 PM |
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quote:
Originally posted by Noodle
quote:
Originally posted by jcduroc
...and this is MK rear susp
Picture 2 is also MK Indy rear.
Neil.
Well Neil, it doesn't look like their upright; it's very different from the one in picture 5
[Edited on 19/11/03 by jcduroc]
JCM
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timf
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| posted on 19/11/03 at 08:14 PM |
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picture 2 is an early triton rear upright
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Alan B
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| posted on 19/11/03 at 08:29 PM |
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Yep agreed..
1 is the Westfield XTR2
2 is the Triton
3 is the Silva Striker or Phoenix (I think)
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Bob C
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| posted on 20/11/03 at 12:24 PM |
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Ta for all the research JC. love the pic 2 upright (not keen on the rest of it..)(don't like the angle of the coilover or the fact that
it's top mounting looks flimsy). Pic 3 looks most like my "vision".
my choices seem to be:
1) more chassis work to get a lower top mounting or
2) "extend" a stock shock
Any thoughts re [2]? Weld on a 40mm diam extension tube???
I''m finding it difficult to get dimensional information about coilover units - the spax & koni websites just bang on about their
fiesta kits... Where should I be looking guys?
Cheers
Bob C
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Bob C
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| posted on 20/11/03 at 12:34 PM |
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Oh yeah - pic 4 is indeed an mx5 rear subframe - I note it has more extra bracing to the inboard lower wishbone pivots than I've seen elsewhere.
FWIW these pivots are on "cam bolts" on the mx5 so you can adjust rear toe, track & camber.
cheers
Bob C
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jcduroc
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| posted on 20/11/03 at 03:30 PM |
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quote:
Originally posted by Bob C
my choices seem to be:
1) more chassis work to get a lower top mounting or
...
Bob C
In any case do not mount the coilover in the middle of a tube; make an apex of 2 or 3 tubes dispersing the load to the structure.
Cheers
Joćo
JCM
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Noodle
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| posted on 21/11/03 at 10:54 AM |
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Well Neil, it doesn't look like their upright; it's very different from the one in picture 5
[Edited on 19/11/03 by jcduroc]
Well spotted that man.
This is an MK Indy rear upright
Cheers,
Neil.
 
MK Indy Rear Upright
[Edited on 21/11/03 by Noodle]
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kiwirex
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| posted on 25/11/03 at 07:40 AM |
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Back to the long coilover question - some of the later jap cars have mcpherson struts with very narrow coils at the back, which is almost the same as
a long coil over.
Different top mounts I guess, but I'm not an expert.
Talking 90-95 nissan sunny and toyota corsa (yep, not vauxhall corsa, different car altogether), and starlet II (or something).
Been thinking about using them myself because I can pick up a pair for $120, rather than the $600 (nz) two coilovers would cost me.
- Greg H
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