new 620 owner looking for advice

[turbo9111]

I have a new 620r and i,m looking for some advice, I've had the car for few weeks now from new and been out a few times covering 300 miles on our odd few dry road days, and im finding the suspension a bit to hard for road driving to the point where under aceleration when hitting a bump in the road it feels like its going to spit me off the road, ive thought of undoing the rear roll bar to try to make the rear wheels independant just wondering if anyone else feels the same with the 620 or is it a hand in pocket and get some adjustables on it soft for road hard for track ?,
cheers

[mrB10]

I'd take the car to a specialist and have them set the car up properly. It'll transform the car.

[Trackdayguy]

mrB10 said:

I'd take the car to a specialist and have them set the car up properly. It'll transform the car.

Great advice. It's also an R spec car which is a Track Focused Car, most tracks tend not to have those bumps. Hope you find a solution.

[turbo9111]

mrB10 said:

I'd take the car to a specialist and have them set the car up properly. It'll transform the car.

I was thinking this and im aware a good stiff car is awesome on track and crap on the road i have another couple of lotus cars with nitrons on and the adjustability suits both road and track im trying not to spend on bespoke shocks on the cat but got a feeling this is the way to go i come across a thread of using PENSKE shocks anyone got any experiance with these ??

[Tazio77]

Have a chat with Simon at MeteorMotorsport...

[HustleRussell]

You can disconnect the rear anti roll bar but it won’t make the suspension any more independent

Simple things first, what tyre pressures are you running?

[Caddyshack]

Don’t Caterham setbthem up for you? I would have thought they could tune it to anything you want?

Dave Wedge is known to be very good as are Gravity Force

[dsl2]

As already mentioned speak to Simon at Meteor motorsport, what he doesn't know about suspension & setting up a Caterham isn't worth knowing having been an owner & top level competitor in them for years.

Where are you in the west mids, I'm near to Droitwich & have quite a lot of Caterham experience if you want to have a chat or check the setup on my flat patch at home.

[Trackdayguy]

Looks like your getting some great advice, that's what these forums are all about.

[Equus]

HustleRussell said:

You can disconnect the rear anti roll bar but it won’t make the suspension any more independent

This. You've got a deDion rear end, which is a form of beam axle: it will never be independent.

Not wishing to cause a st storm on this particular part of the forum, but Westfields (which have true IRS by double wishbones) ride and grip significnatly better than Caterhams when properly set up, on the sorts of surfaces you get on public B-roads. The Caterham alternative would be a CSR, if you can find one.

As others have said, proper damping set-up is the key to getting the best compromise, but you do need to be conscious that you're driving a very light car, with very limited ground clearance and adverse sprung:unsprung weight ratio. With the best will, and the finest dampers, in the world, the laws of physics are against you: the dampers have got to be set stiff enough to check the unsprung mass to a standstill relative to the chassis, before it hits the bumpstops.

[fergus]

dsl2 said:

As already mentioned speak to Simon at Meteor motorsport, what he doesn't know about suspension & setting up a Caterham isn't worth knowing having been an owner & top level competitor in them for years.

Where are you in the west mids, I'm near to Droitwich & have quite a lot of Caterham experience if you want to have a chat or check the setup on my flat patch at home.

+1 for Simon @ Meteor

He now has a seperate site @ https://www.raceshocks.uk/

[jimmy7]

+1 for Simon and Meteor - he spec'd and supplied some Nitron shocks for my car and it has transformed it.

I see you are in the Midlands - McMillan Motorsport know their way around a Caterham, might be worth a chat also.

http://mcmm.co.uk/

[turbo9111]

Thanks for all the advice, due to personal reasons ive not been on here for few days but do apreiciate all the comments, cheers

[Monsieur Du Lard]

A 620r has stupidly hard spring rates - 300 lb on the rear. Leave the dampers alone, as this will make no difference. Get someone who knows what they are doing to flat floor and calculate the correct rates. DPR can do this.