I'm looking at getting some custom made progressive rate springs for the rear of my RRC, mainly to restrict upwards tyre movement (blasted inner wheel arches), whilst maintaining a softish suspension and doing away with dislocating springs whilst I'm at it. I've measured and weighted up the RRC so I got a number of the basic requirements worked out, but I have a few questions.
1) I have static weights acting on the springs, are there any rules thumb for predicting the dynamic laods, both with the axle level, ie. driving over a speed bump and when on articulation, ie. driving quickly through a set of axle twisters?
2) Are there any companies that you would recomend for custom wound springs?
3) Has anyone used bump stops inside the coil springs on a LR, if so how succesful were they?
If I just extended the normal bump stops far enough to stop the tyre hitting the wheel arch on full articulation then there would only be an inch or so clearance between the axle and bumpstop when parked on level ground. I could lift the suspension more to get round this problem, but for various reasons I don't what to lift it much more than it already is.
Using double spring is another option, though the approximate costs I've gathered so far for custom wounds for a LR are no more expevise than a pair of uprated springs of a suitable rate/length and some X-springs.
Full Version: Custom coil springs
I think llovels in bradford will make you up any springs you want, i would also have a word with tomcat as they have some funky springs off the shelf at rather good prices.
Will.
Will.
QUOTE (muddy @ Aug 9 2008, 11:46 PM) 
I think llovels in bradford will make you up any springs you want, i would also have a word with tomcat as they have some funky springs off the shelf at rather good prices.
Will.
Will.
Spax used to do the custom stuff for pretty much the same cost as the off the shelf stuff.
You want to chat to Falkners, as they will design and custom wind any spring for you, at very reasonable prices. I have just order 8 springs for the racer, and was very impressed with the service and price. I haven't received the springs yet, but the order is being turned around very quickly (2 weeks for a custom designed and manufactured product). Assuming the springs are as good as the service, I will have no hesitation in using them again. Other friends who have used them have been more than happy with the product.
For info, they supply springs to Milners, Prodrive, Prolinx, White Power, Demon Tweeks and other high profile motorsport supplier.
D. Faulkner Springs LLP,
Greensleeves, Northfields Lane,
Westergate,
Chichester,
West Sussex, PO20 3UH
ENGLAND.
+44 (0)1243 543049
+44 (0)1243 542133
sales@dfaulknersprings.com
And you want to speak to Peter!
Hope that helps,
Toby
For info, they supply springs to Milners, Prodrive, Prolinx, White Power, Demon Tweeks and other high profile motorsport supplier.
D. Faulkner Springs LLP,
Greensleeves, Northfields Lane,
Westergate,
Chichester,
West Sussex, PO20 3UH
ENGLAND.
+44 (0)1243 543049
+44 (0)1243 542133
sales@dfaulknersprings.com
And you want to speak to Peter!
Hope that helps,
Toby
QUOTE (clbarclay @ Aug 8 2008, 06:57 PM)
1) I have static weights acting on the springs, are there any rules thumb for predicting the dynamic laods, both with the axle level, ie. driving over a speed bump and when on articulation, ie. driving quickly through a set of axle twisters?
I found the thread I was think of which promptet this question. See Simon's comment
http://forums.lr4x4.com/index.php?showtopi...359&hl=soft
QUOTE
As a rule of thumb, a wheel will see about 1.6 to 1.8G acceleration while off-roading. That means that if you jack a wheel until the spring just dislocates and measure the separation between the axle and bump stop, this distance should be at least 1.8 times greater than the distance measured when at rest.
For road-going cars, manufacturers use 1.5 to 1.6. Race & rally generally use 1.8 to 2. Stock Land Rover springs use about 1.7 - and that seems to give a good compromise of stability and flexibility. If you keep the same ratio and extend the spring - the handling will remain acceptable.
For road-going cars, manufacturers use 1.5 to 1.6. Race & rally generally use 1.8 to 2. Stock Land Rover springs use about 1.7 - and that seems to give a good compromise of stability and flexibility. If you keep the same ratio and extend the spring - the handling will remain acceptable.
My current estimations for new springs look like they will with stand a 1.7 G when loaded up on level ground (measured it loaded with my typical off roading gear and some extra ballast for good measure), but on full articulation they don't allow for much additional G forces when cross axled and ballasted.
Also as a check for ride height, what should be the distance between the bumpstop and axle (or alternatively compressed spring lengths) be for a standard land rover?
I found this on guide to coil overs on pirate 4x4. I certainly has some useful info including an excel based calculator for selecting spring rates.
http://www.pirate4x4.com/tech/billavista/coilovers/Part_1/
http://www.pirate4x4.com/tech/billavista/coilovers/Part_1/
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