How to stiffing rear of tarmac car

[greene94]

I have a rally car but I think the rear is a bit soft in the corners I have group a rear shocks and springs in is there any other roll bars I can put in or anything else I can do ?

[8valve-craig]

A GTE - GSi - TD rear roll bar might help. It fits inside the beam and is a bit thicker than other models. Otherwise, staying on roll bars a Cavalier / Saab secondary one can be fitted to the Nova Beam.

Regards to shocks and springs I'm sure Paul (Rallymarshal) will be along with some advice soon.

[greene94]

How do you fit a cavalier one to the rear beam ? Do you know anyone that done it to I see how its done

[Iain]

There's a thread in 'Articles' section on here with lots of how-to info and pics.

It basically clamps on the front (either welding tabs or U bolts) and attaches down the rear legs of the beam.

Coilsprings may be able to do you a stiffer rear spring.

[greene94]

Was thinking a stiffer spring but I have a rotten cavalier axle there with the roll bar on it so it would be cheaper to do what lbs spring would I run ? Any recommendations

[Iain]

I guess you need to know what you're running now to make an educated guess on what they should be.

[greene94]

I know there no way of testing the lbs of a spring so might just have to guess

[greene94]

I cant find the threw for the cav anti roll bar can someone post a link

[Iain]

Possibly harder if they're progressive but there has to be a way to test them at a proper place?

Here's the link for you good sir: http://www.pngclub.com/forum/showthread.php?185728-HOW-TO-Fit-a-secondary-rear-ARB-on-a-Nova-beam

[RallyMarshal]

Springs can be tested - Avo will do them on their rig plus many rally prep places.

If theyre progressive then its harder to do but standard rate arent too bad.

For info Im running 35nm coilover rears on smooth tarmac = 200lbs at the wheel on my Astra 1600cc but I prefer the car soft. I run a through the beam ARB and an external Astra GTE 16v ARB on the rear and no front ARB.

Just won our class at Blyton at the weekend so cant be too bad a setup though first time out with coilovers and was totally wet.

Paul.

[Novarally140016v]

I have a rally car but I think the rear is a bit soft in the corners I have group a rear shocks and springs in is there any other roll bars I can put in or anything else I can do ?

What is the specific handling issue?

I have bilstein rear tarmac dampers i think they are 200/80, with pro-tec rear springs and GSI anti roll bar.

Mine is fairly soft on rear, and the rear its a bit loose, but it cuts down the understeer from the front.

Christopher

[RallyMarshal]

....

..... and the rear its a bit loose, .....

Christopher

Understatement of the year looking at your Goodwood footage.. But loose is fast if you can control it.

Paul..

[greene94]

My car is probly set up really close to I'm going to try stiffin the rear up a bit mine would drive like yours there abit tail happy in the wet but everyone likes there car different set up

[Novarally140016v]

Understatement of the year looking at your Goodwood footage.. But loose is fast if you can control it.

Paul..

Haha,the problem with Goodwood is the stages are very short. If I could get some more tyre temperature on the rear i think it will be ok. We are going to try changing the toe and camber on rear to improve this.

But saying that it is predictable.

Christopher

[greene94]

What axle gave you in your car it must not be a standard one I you can adjust it

[Mxcrazy]

What axle gave you in your car it must not be a standard one I you can adjust it

Theirs is standard.

You can buy tapered shims to install behind the bolt on hubs to change the geometry.

[greene94]

I know you can adjust the camber that way but what way do you adjust the castor

[Novarally140016v]

I know you can adjust the camber that way but what way do you adjust the castor

You cant adjust the castor. So you put shims in top or bottom to adjust camber and shims front a back to adjust toe.

Christopher

[greene94]

Aww never thought about that what toe would you put on the back of a nova ?