pmc_3
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| posted on 26/5/05 at 09:12 PM |
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coilovers and spring rates
What are peoples opininons on the protec alloy bodied coilovers? What adjustment do they have?
Just about to start the front end steering/brake/suspension upgrade on the dutton. Next problem is i'm not sure what spring rate to use at the
front. Reading some info on Duttons it would appear its currently Spitfire coilovers at the front about 180lbs. The rear is still leaf spring at the
moment somewhere around 95-115lbs. The car weighs in at about 650kg with 2.0 pinto.
A lot of the locosts and westfields seem to have much harder springs up front? Its being used for road use but will be doing some track days.
Any opinions? 
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NS Dev
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| posted on 27/5/05 at 07:47 AM |
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Protech Shocks - excellent value for money, very light, adjustable platform and damping (one control for bump and rebound)
As for spring rates, ignore those westy's with silly high spring rates. The rates you have now are perhaps a touch soft, but not far off at all
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pmc_3
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| posted on 27/5/05 at 07:58 AM |
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Thanks 
Dont know what options you get for the spring rates but I was thinking of upping the front to about 200lbs
Also whats the difference between 1.9ID and 2.25ID springs?
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ChrisGamlin
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| posted on 27/5/05 at 10:25 AM |
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You can only really compare spring rates with other cars the same as yours as suspension design has a large effect on the actual spring rates you need
to use. If you wanted to do a comparison with different cars then you'd need to work out the effective wheel spring rate which takes into
account the angle the spring/damper is at, and where it is attached to the wishbone etc.
[Edited on 27/5/05 by ChrisGamlin]
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Fred W B
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| posted on 27/5/05 at 11:11 AM |
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Ive doen a spreadsheet that accepts inputs for all the various parameters and desired wheel frequency, (as per staniforth) and outputs required
spring rate.
E mail me if you want a copy. I don't know how to get it hosted somewhere so all can see it?
Cheers
Fred WB
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NS Dev
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| posted on 27/5/05 at 11:38 AM |
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quote:
Originally posted by pmc_3
Thanks
Dont know what options you get for the spring rates but I was thinking of upping the front to about 200lbs
Also whats the difference between 1.9ID and 2.25ID springs?
They have a different internal diameter!
You really need to suck it and see with spring rates, but if it works now, then keep it the same with your new shocks and as you have already said,
work up a notch on the spring rates if it feels to soft. Always err on the softer side, and always play with the dampers a lot before changing spring
rates. Again start full soft on the dampers (knobs fully anticlockwise) and work up from there.
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nige
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| posted on 27/5/05 at 11:54 AM |
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springs
ns dev ....
what spring rates are you using on yours
front and rear ????????????????????????
when you start this journey
you think it will be done in " no " time but then " no " turns into a " bloody " long time
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NS Dev
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| posted on 27/5/05 at 12:06 PM |
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he he!
Don't know yet!!
Ball park start point is going to be 275 lb on the front and 160lb on the back.
I think the 275 lb fronts may be too hard though, especially when I get through SVA and add a front anti-roll bar.
I will get a few sets, they are only around £12 each from Rally design so I will get 160lb for the rears, which I am fairly confident will work, and
get 225lb, 250lb and 275lb for the front and try them. It's cheaper the buy the lot and only pay once for the postage!
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nige
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| posted on 27/5/05 at 12:15 PM |
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springs
COOL
that the figures i had in mind maybe
180 rear as im a lardy chap and 275 front
as mines plus 4 so there,s a bit more of
everything
cheers for that
when you start this journey
you think it will be done in " no " time but then " no " turns into a " bloody " long time
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paulf
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| posted on 27/5/05 at 09:13 PM |
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Im running 275 front and 160 rear and its not to bad , i have found that the rear sometimes bottoms out when two up but is fine on my own.
however i have stiffened the front dampers up to 5 clicks and now find i have ok turn in on slow corners and roundabouts etc but am starting to find
that i get understeer on long fast corners .This worrys me a little as the temptation to lift off is sometimes there even though i know i shouldnt,
would this be due to to soft rear springs or to soft dampers at rear?.I dont want to soften the front any more as it now seems ok on bumps etc.When
softer i was getting some bump steer.
Paul
quote:
Originally posted by NS Dev
he he!
Don't know yet!!
Ball park start point is going to be 275 lb on the front and 160lb on the back.
I think the 275 lb fronts may be too hard though, especially when I get through SVA and add a front anti-roll bar.
I will get a few sets, they are only around £12 each from Rally design so I will get 160lb for the rears, which I am fairly confident will work, and
get 225lb, 250lb and 275lb for the front and try them. It's cheaper the buy the lot and only pay once for the postage!
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