19 posts / 0 new
Last post
JeWe
Offline
Last seen: 11 hours 28 min ago
Joined: 27/09/2021
Springs

Car is a roadsport 140 with wide track front suspension and Bilstein dampers with adjustable platforms. Springs are Eibach 77843.

I am trying to make the car more compliant for our bumpy roads as it is a daily and covers about 8000 miles a year. Can anybody advise me if there are softer/progressive front springs and if this is an improvement.

Tazio
Tazio's picture
Offline
Last seen: 21 hours 55 min ago
Joined: 17/04/2014

The front springs you have fitted are deemed the race springs and rated at 250lbs, as per the Caterhamparts website, these are usually fine on the roads and are often fitted to stop the car bottoming on compression, I use them on my VX engined car and find them fine.

Do you know what the rears part numbers are? as normally they are progressive springs, part number 71198.

A person you could talk to is the ubiquitous Simon Rogers at Meteor Motorsport, he can advise you, ( and sell you all manner of upgrades if you let your guard down!) lol

JeWe
Offline
Last seen: 11 hours 28 min ago
Joined: 27/09/2021

Spoke to Simon, unfortunately the budget does allow his shiny upgrades just yet...

The VX engine is much heavier than the Sigma, this should make a difference in spring rates required. As mentioned I am looking for more compliance not outright track performance.

SM25T
SM25T's picture
Offline
Last seen: 7 hours 27 min ago
Joined: 17/04/2014

I fitted 300lb fronts and 180lb linear rears on my 1.8 SV together with one way adjustable dampers from Protect which were revalved by Procomp Motorsport. Great for road use. Smooth out the bumps effectively.

SM25T
SM25T's picture
Offline
Last seen: 7 hours 27 min ago
Joined: 17/04/2014

I fitted 300lb fronts and 180lb linear rears on my 1.8 SV together with one way adjustable dampers from Protech which were revalved by Procomp Motorsport. Great for road use. Smooth out the bumps effectively.

JeWe
Offline
Last seen: 11 hours 28 min ago
Joined: 27/09/2021

That sounds like a viable option. Could you give me any indication about price?

SM25T
SM25T's picture
Offline
Last seen: 7 hours 27 min ago
Joined: 17/04/2014

I paid £576 in total for 4 springs and dampers including revalving and delivery. Probably 5 years ago ?

7 wonders of th...
Offline
Last seen: 7 hours 21 min ago
Joined: 17/04/2014

250lb are normally fine for road, what tyres, pressures and ARB's are you running....?

Richard Price
Richard Price's picture
Offline
Last seen: 10 hours 44 min ago
Joined: 17/04/2014

Standard front springs are normally 150lbs/in. I'm sure there will be plenty of folks who have a set having "upgraded" to stiffer springs.

If you're after a more compliant ride, I'd try a set of softer springs. However, you may also need a set of spring retainers, as the 150 springs are 1.9" ID, where the 250's are 2.25".

 

JeWe
Offline
Last seen: 11 hours 28 min ago
Joined: 27/09/2021

Running Avon ZZS 185/55 R13 all round, 20PSI.

JeWe
Offline
Last seen: 11 hours 28 min ago
Joined: 27/09/2021

That looks like a good starting point, what is the rate for the standard rear springs?