Guest Posted April 25, 2014 Share Posted April 25, 2014 Hi All Still loving my sigma Supersport however I've been amazed at how differently it rides between driving it alone and driving with a passenger.When driving alone, it can be quite 'bouncy' as if it's very under damped. The car will happily skip over bumps and give me the odd heart-in-mouth moment. With a passenger there are no such issues. So the question is...is this common for other SS owners and what are the remedial actions (flat-flooring?)? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 25, 2014 Member Share Posted April 25, 2014 ... are the two conditions matched for speed? ;-) Jonathan Link to comment Share on other sites More sharing options...
GF04RCE Posted April 25, 2014 Share Posted April 25, 2014 Others here will understand this better than me but I wonder if Bump Steer comes into this...... with greater weight in the vehicle I guess it changes the influence of bump steer.... Big difference to my car since popping in a couple of 10mm spacers under the rack..... Just a thought..... David M Link to comment Share on other sites More sharing options...
Guest Posted April 25, 2014 Share Posted April 25, 2014 Quoting Jonathan Kay: ... are the two conditions matched for speed? ;-) Jonathan Yes. Link to comment Share on other sites More sharing options...
shn7 Posted April 25, 2014 Share Posted April 25, 2014 A passenger is a much greater percentage of total weight than in other cars so will have mouch more noticeable effects. Especially great rear end traction/grip. Having said that it could be that in your case this is being exaggerated due to poor corner weights. Has the car been flat floored and if so with what occupant weight(s)? Oh and not wishing to pry but how heavy is the passenger? Link to comment Share on other sites More sharing options...
Guest Posted April 25, 2014 Share Posted April 25, 2014 No the car has never been flat floored. My passengers range from 58kg to 85kg. Link to comment Share on other sites More sharing options...
shn7 Posted April 25, 2014 Share Posted April 25, 2014 OK so not exceptionally heavy passengers. You could try someone else's similar car but the key there is the word similar which isn't always easy to find given they are all different 😬 I'd suggest flat floor set up in the first instance though if you are considering any other suspension related changes do these first or you will need to for the setup again. Link to comment Share on other sites More sharing options...
Domus Posted April 25, 2014 Share Posted April 25, 2014 Eat more pies 😬 Link to comment Share on other sites More sharing options...
Mankee Posted April 25, 2014 Share Posted April 25, 2014 Doesn't a Sigma Supersport come with an uprated spring and damper package? I would check that you've got the right springs and dampers, as judging from Caterham's recent performance with parts supply, you might have uprated springs and standard dampers that can't control the spring properly Link to comment Share on other sites More sharing options...
Guest Posted April 25, 2014 Share Posted April 25, 2014 Hi Grant_7 I've got a sigma supersport . The car is noticably more responsive with just me in it but I haven't noticed a significant drop off in ride quality or cornering grip even on rough (are there any in the UK that aren't ) roads. As the suspension is adjustable it may well be worth getting it checked out. I'm thinking of getting mine set up properly before I track it. 😬 Tom Link to comment Share on other sites More sharing options...
Boris Posted April 26, 2014 Share Posted April 26, 2014 Hi Grant, Start with tyre pressures, I find the car is much more settled at 16 psi (but I'm on 15" CR500's, and I think your running 13") Then I think you need to speak with Troy here and get the car flat floored. It was by far the best upgrade I done. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted April 26, 2014 Leadership Team Share Posted April 26, 2014 +1. For 13" wheels try 17psi and see how it feels. Stu. Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted April 26, 2014 Share Posted April 26, 2014 Do you have the watts rear end? If just the trailing arms, make sure they're in the lower hole. Link to comment Share on other sites More sharing options...
Guest Posted April 27, 2014 Share Posted April 27, 2014 Thanks All As for tyre pressures, I'm running 35psi...just joking ( 😬) I'm running 18 psi cold. Will try 16 psi on a blat to see if it helps. In talking with Stuart Cresswell yesterday he is of the view that perhaps, and as was the case with his Supersport, the dampers have not been assembled correctly. Will post some pics up soon showing the setup which will help root cause the issue. However in the meantime http://www.jonrb.com/emoticons/skidmarks.gif 😬 Link to comment Share on other sites More sharing options...
RICHCAT7 Posted April 27, 2014 Share Posted April 27, 2014 You might joke Grant,but when i first got my 7 i was running about 30 psi,found it a bit skittish though Link to comment Share on other sites More sharing options...
Leadership Team Garry7 Posted April 29, 2014 Leadership Team Share Posted April 29, 2014 Another question, are the spring damper units fitted "upside down". ISTR that they fit them the other way up on Supersports? Link to comment Share on other sites More sharing options...
StEVEN Posted April 29, 2014 Share Posted April 29, 2014 The Springs and dampers are i believe Track Dampers and springs with a rear anti roll bar it has a stiff Kart like set up compared to my old k Series Cars which were much softer so much so on my previous k 160 VVC i smacked the sump and cracked the block which required a 6k engine rebuild through insurance 😔....so as you can imagine i don't moan about the stiff setup on mine 😬..The front shocks on mine are upside down, less unsprung weight so i'm told....the Sigma sump is low but has never touched the Tarmac ......The moral of this Post, Stiff is Best boys *tongue*Oooer 😳 Enjoy Link to comment Share on other sites More sharing options...
10uptobase Posted April 29, 2014 Share Posted April 29, 2014 My sigma roadsport was skitich and bump steered quite badly. Much better since I reduced the camber on the front wheels to the correct angle... 😶🌫️ Link to comment Share on other sites More sharing options...
Guest Posted April 29, 2014 Share Posted April 29, 2014 Thanks all. Am going to get some snaps of my setup and will post back soon. Link to comment Share on other sites More sharing options...
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