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caterham progressive springs
19sac65 - 28/9/12 at 02:13 PM

does anyone know what the rating of standard caterham roadsport rear progressive springs are
thinking of trying some on my westfield seiw
thanks

Bare - 28/9/12 at 03:41 PM

Progressive springs are Crap for track performance.. their response isn't linear and unstabling.
Great for Boulevard Cruising tho.

sebastiaan - 28/9/12 at 05:23 PM

quote:
Originally posted by Bare
Progressive springs are Crap for track performance.. their response isn't linear and unstabling.
Great for Boulevard Cruising tho.


Really, one of those responses? AGAIN? FFS man, lighten up a bit....

As for the springs, AFAIK the caterams used 90/180 LBS/in springs on the rear. Be aware that you need a bit more travel on the shocks though to account for the softer first bit of the spring. I do not know what lenght the cat springs were, at what length the spring rate starts rising and at what length it hit 180 LBS/in.

I guess it really needs some maths to figure out what would work.

sebastiaan - 28/9/12 at 05:24 PM

O, and welcome to the madhouse by the way! Hope you don't feel to discouraged by the initial reply to your question. We're quite a nice bunch normally.

rodgling - 28/9/12 at 11:13 PM

I have some 8" 2.25 ID 375/525lb springs available if interested? (I know that sounds quite stiff but I think that means the combined rate should be 218 which is more sensible).

[Edited on 28/9/12 by rodgling]

MikeCapon - 29/9/12 at 12:25 PM

quote:
Originally posted by rodgling
I have some 8" 2.25 ID 375/525lb springs available if interested? (I know that sounds quite stiff but I think that means the combined rate should be 218 which is more sensible).

[Edited on 28/9/12 by rodgling]


Just for your info a 375/525 spring will likely be a dual rate, starting at 375 lbf/in and swapping to 525 lbf/in at the point where the cose coils touch.

And +1 for Bare's opinion. I was shocked the other day when I saw Caterham were using progressive springs. On tarmac these are usually a bodge to repair poor design IMO.

rodgling - 29/9/12 at 12:48 PM

quote:
Originally posted by MikeCapon
quote:
Originally posted by rodgling
I have some 8" 2.25 ID 375/525lb springs available if interested? (I know that sounds quite stiff but I think that means the combined rate should be 218 which is more sensible).

[Edited on 28/9/12 by rodgling]


Just for your info a 375/525 spring will likely be a dual rate, starting at 375 lbf/in and swapping to 525 lbf/in at the point where the cose coils touch.

And +1 for Bare's opinion. I was shocked the other day when I saw Caterham were using progressive springs. On tarmac these are usually a bodge to repair poor design IMO.


I think the combined rate is actually 218 - I put them on the front of my car but they were much too soft (I was running 350 previously). If they were 375 going up to 525 I think they'd have been OK, or at least closer. But I think the comments here have probably killed the market for my old springs :-)

MikeCapon - 29/9/12 at 01:52 PM

quote:
Originally posted by rodgling
quote:
Originally posted by MikeCapon
quote:
Originally posted by rodgling
I have some 8" 2.25 ID 375/525lb springs available if interested? (I know that sounds quite stiff but I think that means the combined rate should be 218 which is more sensible).

[Edited on 28/9/12 by rodgling]


Just for your info a 375/525 spring will likely be a dual rate, starting at 375 lbf/in and swapping to 525 lbf/in at the point where the cose coils touch.

And +1 for Bare's opinion. I was shocked the other day when I saw Caterham were using progressive springs. On tarmac these are usually a bodge to repair poor design IMO.


I think the combined rate is actually 218 - I put them on the front of my car but they were much too soft (I was running 350 previously). If they were 375 going up to 525 I think they'd have been OK, or at least closer. But I think the comments here have probably killed the market for my old springs :-)



Sorry. I was certainly not trying to ruin your pitch. Only trying to inform. If you can let me have the wire diameter, total coil nos, OD and coil pitches I can let you know what springs you do have.

phelpsa - 29/9/12 at 03:59 PM

quote:
Originally posted by Bare
Progressive springs are Crap for track performance.. their response isn't linear and unstabling.
Great for Boulevard Cruising tho.


Also good for cars running even a moderate amount of aero downforce

Unlikely on a caterham, but they do have their place.

rodgling - 29/9/12 at 05:49 PM

quote:
Originally posted by MikeCapon
Sorry. I was certainly not trying to ruin your pitch. Only trying to inform. If you can let me have the wire diameter, total coil nos, OD and coil pitches I can let you know what springs you do have.


No worries, I wasn't really expecting to sell them but thought I'd offer. Out of interest, anyone have any springs for sale 2.25" ID, around 10" and 275 lb/in?