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Progressive rate front springs


DJB_Harvey

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DJB_Harvey wrote:
Right I've got a pair of new old stock C.Witor 200/400 progressive front springs to try on my Mk2 PI saloon ... Any thoughts on these ? Also which way round should they be fitted ? Thanks .


Glad you asked that Dave, I have a pair to build up which will go on the pi, I will ask CW when I ring him tomorrow as it was my first thought.
What inserts are you going to use?

I'm going to put them on the pi as it has no ARB and progressive springs were originally designed to do the same job (I have read somewhere!)
The struts on the pi which I rebuilt last year will go on the estate as I have never touched those ones.


Colin

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I'm going to use some Koni adjustable inserts to match my rear set . They seem to be superior to other types . Thanks for the info Colin I would've put them that way round ala valve springs .
Just out of interest I've always used 160LB semi fast road springs and these have given excellent results ... Just thought I'd experiment with the progressive types .

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I think Chris told me to put the tight coils at the top so the the dirt didn't rub between the coils.  I like them.  Much better ride than the ones that were on it before even though the ride height seems about the same.  Dunno exactly what was fitted before mind...... they were red and came with the car......

Nick

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I think Chris told me to put the tight coils at the top so the the dirt didn't rub between the coils.  I like them.  Much better ride than the ones that were on it before even though the ride height seems about the same.  Dunno exactly what was fitted before mind...... they were red and came with the car......

Nick

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Going from various Stag posts from what Chris Witor has said (and the specialists who sell his springs) they say to go from the top :).  It's what I plan to do anyway.

I shall admit Alan, whilst a saloon is slightly different, the figures Vizard suggests for the Saloon spring rates is quite different, but then he does say to go for thicker ARBs all round instead.

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Fitted the 200/400 springs today left the Konis until I've tested them on the road ... Don't like doing 2 changes at the same time otherwise your never sure what's improved what . In the end I put the tighter coils at the top , good job I did otherwise stones definitely could get trapped .
Surprisingly the ride height is now 10 mm higher which is not what I expected  but the old 160's had been on for over 10 years so they probably had sagged a little .
Road test reveals it's a lot smoother on the road I'll see how it goes over the next month or so before fitting the Koni's .

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If you have a look at the spring with the weight off the car on then you'll be able to tell , the progressive rate ones look almost  coil bound at one end depending which way round they have been fitted . If the tighter coils are at the bottom then there's a definate chance that large stones could easily get trapped .

Another thing about the progressive springs is that I didn't need to use the spring compressor to fit them ... There shorter but obviously stronger .

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DJB_Harvey wrote:
Another thing about the progressive springs is that I didn't need to use the spring compressor to fit them ... There shorter but obviously stronger .


That is a bonus on its own then Dave, I didn't get a chance to ring CW today in the end, I was busy fitting one of his 6-3-1 manifolds to the estate (all in the blog later).

Colin.

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