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Alan & Evi

Advise on replacement front springs please

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Hi again folks,

I need advise please on what strength/rating springs I should get for the front suspension.

My current suspension set up is hopelessly too soft and low (set by previous owner), and is causing the front valance to fowl on normal height speed bumps (at 1mph!) and moderate bumps in the road, at around 40mph.

On a recent organised navigational run through the country, the front valance must have scraped the road about 30 times, sometimes really seriously, so leaving it alone isn't an option.

My set up uses the original Lotus springs (which seem to be really tired) and ProTech non-height adjustable shocks (there are height adjustable ones at the rear).

I want to replace the current springs with some new ones, but don't know what poundage/rate I should be after.

I am also thinking it might be a good idea to get some progressive/'rising-rate' ones, and any additional advise on this would be helpful.

I am not sure yet whether I will need to consider also raising the springs to raise the front ride height, but I would imagine that with some new springs at the correct poundage rate, the ride height should revert back to how it should have been from the factory, and that is all I am after.

The shocks are working fine, and will be kept.

You've all been so helpful to me before, and I hope I'm not being too much of a burden asking for help again.

Looking forward to seeing some of you at Duxford Air Museum this coming Monday 1st May, and maybe some of you at the Ace Cafe this Wednesday? We'll be there!

Thanks for your help, Al.

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There are springs for your car in the lotus parts sale, as I enquired about them for mine and was told they are for 85 and before models.

Might be worth a look?


Amateurs built the Ark

Professionals built the Titanic

"I haven't ridden in cars pulled by cows before" "Bullocks, Mr.Belcher" "No, I haven't, honestly"

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Alan

A couple of thoughts, are the rears adjusted too 'high' causing the front to dip and ...

Is one or both cracked and lost a coil?

Drove sues car 300 miles with a broken front spring and because the car is so 'flat' through the corners, couldn't tell!

John

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Think the 1st May is a sunday

Edited by pete

hindsight: the science that is never wrong

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I'm guessing you have the springs supplied with the Protechs by a specialist (although Protech do not supply them). Mine were like that, it may have contributed to the dampers failing very prematurely.

Before you consider getting new springs to fit, check the dampers themselves still have enough damping force.

You may or may not be able to use Lotus springs, Protech do bottom plates for original springs, but they also do plates for straight springs. Check the damper condition, check the style of springs in current use then consider either buying after market springs to suit or Lotus if you can accommodate them, perhaps even getting the alternative lower plates to go the Lotus route if you really want to.

After my experience I would simply not use Protechs again, but others have found them OK.

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Just to clarify, is it too soft, or too low ? I run standard springs on Protechs and find it a good set up. The front springs are a tapered coil.

The top cup that the spring sits in is supposed to have a fairly substantial rubber platform for the spring to sit on, might be worth making sure it's there.

In all this you should closely inspect the condition of all the bushes, these have an impact on your effective spring rate, and should be in first class condition or replaced prior to deviating on springs or shock absorbers.


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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I've looked at the car, and the fronts are original, too low and too soft. The rears are Protechs and are now adjusted to just below normal height. Alan, I'd suggest going for SJ's Protech front setup.


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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I took it from Alan's post that he had Protechs on the front too. So unless they're leaking fluid or something why change them ?

It also means that you are only changing one thing at a time, a practise I favour when it comes to suspension and set up. I'm running the standard spring on mine on Protechs and high seems just right. I'm not disagreeing with you, just posing a point of view. But would still renew the bushes while I was about it, if they only slightly sus. :yes:


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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Coz the rears have clearly been done quite recently, and for some reason a previous owner left the fronts old and weak. The entire car was ridiculously low. I adjusted the backs, but the front grounding was present before that. They gotta be done!

Bushes, yeah, I would. But that's up to Alan. :)


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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I just replaced my front springs (as well as bushes/dampners, other bits/pieces) with SJ "euro" front springs (on a S1). The SJ springs are COMPLETELY wrong. The ride hieight was rediculously high. I cannot recommend the SJ front springs. I think others on the forum have already mentioned this...I have the ride height right now, but it was pain in the backside.

Id recommend sourcing from somewhere else, or getting custom ones made using the factory spec. I havent measured the SJ ones, but there is no way they meet factory spec. Shame as everything else from SJ is usually top notch.

Marcus

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I just replaced my front springs (as well as bushes/dampners, other bits/pieces) with SJ "euro" front springs (on a S1). The SJ springs are COMPLETELY wrong. The ride hieight was rediculously high. I cannot recommend the SJ front springs. I think others on the forum have already mentioned this...I have the ride height right now, but it was pain in the backside.

Id recommend sourcing from somewhere else, or getting custom ones made using the factory spec. I havent measured the SJ ones, but there is no way they meet factory spec. Shame as everything else from SJ is usually top notch.

Marcus

So what front springs did you eventually use?


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