Macca
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| posted on 10/12/02 at 04:19 PM |
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Spring rates
The rolling chassis that I bought came with a set of AVO shock/springs.I have no idea of their rating but would guess they were purchased for a car
engined build.
Does anybody have any experience of these units and any surgestions as to spring rates to suit my build.
Book chassis, De-Dion and ZX9.
Cheers Col
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ChrisGamlin
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| posted on 10/12/02 at 09:08 PM |
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It really depends on what the spring rates are.
Mine has got Avo dampers that were originally bought for a race Locost with the X Flow in. I don't think the dampers are valved optimally for the
car, and the springs are a bit hard (300lb front, 175lb rear), but it handles pretty damn well so I'm not complaining too much.
Have a look at the tops of the springs, the spring rate is very often etched into them, so you can judge from there. Failing that, it is possible to
get a rough idea on their spring rate by putting them onto some bathroom scales and compressing them an inch, though this is quite tricky! Somebody on
the BEC list said that they use their pillar drill to compress the spring onto the scales, which is quite a good idea as its controllable, you can
exert more pressure, and it even gives you a measurement of downward travel to give yourself the proper inch of compression!
If all this is too much of a faff, I would say just try em first and see how it goes, its easy and cheap enough to swap springs at a later date, and I
think you can even get the shocks re-valved if really necessary.
Chris
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Jasper
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| posted on 11/12/02 at 08:20 PM |
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The chap at Dampertech suggested 275's up front, 175's at rear with Gaz shocks and bike engine.
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ChrisGamlin
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| posted on 11/12/02 at 08:45 PM |
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Not too far off mine then 
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sting
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| posted on 3/1/03 at 04:32 PM |
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Hi all
sorry about coming in a bit late on this one but i`ve been away.
Chris have you tried these rates on track?
Or would you need harder for track days?
Cheers
Sting
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Jon Ison
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| posted on 3/1/03 at 04:51 PM |
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250lbs front, 190lbs rear, track days no prob, adjusable platforms n shocks though, i do stiffen things up for the track, but remember to soften up
for the ride home, i forgot once, that M1 is "bloody bumpy" with little to no susspension movement.
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ChrisGamlin
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| posted on 3/1/03 at 05:08 PM |
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Yeh I use those shocks and springs on track, perfectly OK, rolls a lot less than a Westfield and handles really well (doesn't it Jasper?  )
Thats quite hard at the back compared with the front Jon, do you not find it a tad over-steery?
Chris
[Edited on 3/1/03 by ChrisGamlin]
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Jasper
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| posted on 5/1/03 at 02:33 PM |
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At Donnington the back of Jon's car was almost permanently coming round - though that was probably due to the insane cornering speeds and road
tyres!! Great fun though...
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Jon Ison
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| posted on 5/1/03 at 02:52 PM |
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the rears are inclined a little which as the effect of softening them slightly, but yea its a bit oversteery, but been an x autograss racer i like a
car that oversteers, just use the throttle instead of wheel.......
better tyres fitted now too, not realy had chance to push them to the limit yet but suspect there should be a improvement....
"insane cornering speeds" well maybe...
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Homer
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| posted on 6/1/03 at 06:47 PM |
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Hey Jon which club did you race with? Ever come down near the south coast to race? I might have been there to (Weymouth club) What car did you
drive?
 
Rescued attachment banger.jpg
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Jon Ison
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| posted on 6/1/03 at 07:12 PM |
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Class 8, 9, & 10, spent 15 years at in total, but as you well know, the cost of running a special is now more than club circuit racing ?????
the drive looks better without the mud all over it too, oh Nottingham club, raced under N8, then N2........
i still do a bit of banger racing from time to time, last car a cav came out in profit, £20 for car, one final win, £50, £30 profit, never heard of in
grassin ????
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