JeWe Posted January 18, 2023 Share Posted January 18, 2023 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. Link to comment Share on other sites More sharing options...
Tazio Posted January 18, 2023 Share Posted January 18, 2023 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 Link to comment Share on other sites More sharing options...
JeWe Posted January 18, 2023 Author Share Posted January 18, 2023 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. Link to comment Share on other sites More sharing options...
SM25T Posted January 18, 2023 Share Posted January 18, 2023 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. Link to comment Share on other sites More sharing options...
SM25T Posted January 18, 2023 Share Posted January 18, 2023 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. Link to comment Share on other sites More sharing options...
JeWe Posted January 18, 2023 Author Share Posted January 18, 2023 That sounds like a viable option. Could you give me any indication about price? Link to comment Share on other sites More sharing options...
SM25T Posted January 18, 2023 Share Posted January 18, 2023 I paid £576 in total for 4 springs and dampers including revalving and delivery. Probably 5 years ago ? Link to comment Share on other sites More sharing options...
7 wonders of the world Posted January 18, 2023 Share Posted January 18, 2023 250lb are normally fine for road, what tyres, pressures and ARB's are you running....? Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted January 18, 2023 Area Representative Share Posted January 18, 2023 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". Link to comment Share on other sites More sharing options...
JeWe Posted January 19, 2023 Author Share Posted January 19, 2023 Running Avon ZZS 185/55 R13 all round, 20PSI. Link to comment Share on other sites More sharing options...
JeWe Posted January 19, 2023 Author Share Posted January 19, 2023 That looks like a good starting point, what is the rate for the standard rear springs? Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted January 19, 2023 Area Representative Share Posted January 19, 2023 Standard rear springs are progressive. From memory, something line 110 - 130 - 200lbs/in. But, in the normal operating range, you'll run in the 130 section most of the time. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted January 19, 2023 Share Posted January 19, 2023 Tyre pessures are a little high..What about your ARB's...? Link to comment Share on other sites More sharing options...
JP Posted January 19, 2023 Share Posted January 19, 2023 I've just received a full set from Protech - single adjustable with spherical bearings. I re-used my front springs as I had just fitted them before the car went off the road and on testing they were considered to be fine. Anyway, the springs are relatively cheap. Had I replaced all springs the total cost all-in would have been just shy of £700. Can't wait to fit them... Link to comment Share on other sites More sharing options...
Simon.Rogers Posted January 21, 2023 Share Posted January 21, 2023 Tazio that's a terrible thing to say about meFrom what you are describing road use wise and car weight I would get a set of 200lb front springs. Progressive rear.we can get that sorted - well the guys at the shop can as I am lucky enough to be in Daytona working for 2 weeks. Check out the FB feed for all the info.we can even probably make it work with springs that could be fitted to a new set of dampers in the future thereby saving some future cost/redundancy.we have our own progressive rear Eibach sorins made for us. However the cheapest way would be to find some used Caterham springs and swap. The front will be as Richard said @150lb which is a little soft for my liking. Or just mix. Get some. 200lb fronts new and regular Caterham progressive rears. Hope that helps. Link to comment Share on other sites More sharing options...
Simon.Rogers Posted January 21, 2023 Share Posted January 21, 2023 Tazio that's a terrible thing to say about meFrom what you are describing road use wise and car weight I would get a set of 200lb front springs. Progressive rear.we can get that sorted - well the guys at the shop can as I am lucky enough to be in Daytona working for 2 weeks. Check out the FB feed for all the info.we can even probably make it work with springs that could be fitted to a new set of dampers in the future thereby saving some future cost/redundancy.we have our own progressive rear Eibach sorins made for us. However the cheapest way would be to find some used Caterham springs and swap. The front will be as Richard said @150lb which is a little soft for my liking. Or just mix. Get some. 200lb fronts new and regular Caterham progressive rears. Hope that helps. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted January 21, 2023 Share Posted January 21, 2023 Before you start throwing money around I would drop your tyre pressures and look which ARB,s you have and if they are correctly set...... Link to comment Share on other sites More sharing options...
JeWe Posted January 22, 2023 Author Share Posted January 22, 2023 Have experimented with tyre pressures extensively, this seems to give the best results, car has been set up by PGM.ARB have been checked and have been set up carefully, Link to comment Share on other sites More sharing options...
JeWe Posted January 22, 2023 Author Share Posted January 22, 2023 Thanks Simon, will be in touch. Link to comment Share on other sites More sharing options...
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