Rear Negative Camber

[crf450 0 1 Cars]

I'm just replacing one of the stub axles on my 306 rear beam and while it was stripped down I thought I might bore the arm out to give the rear some neg camber. I've done a search and I think the SBC kit gives about degree one negative, does anyone know if this is about optimum for a track car?

Thanks Martin.

[Super Josh 4]

Don't know if the 1 degree of camber is optimum, but the SBC kit also gives a little toe-in too.

 

 

 

 

 

 

 

Josh

[nick 3]

Oi, stop pissing about with your own car and get my pistons done!!

 

Nick

Edited December 21, 2006 by nick

[shine 0]

I've been running with -2,2 degr negative camber rear on my Gti. Don't know difference to -1 degr, but regarding to std it's, very stable at rear, tire temp is almost same inside/outside after heavy track driving, and tyre wear seems to be equal over contact area.

 

When doing this mod I also added some to-in, about 2mm. This makes rear end less overstear.

[niklas 1]

It depends a lot on the roll stiffness of the car, but imagine that most cars with mcpherson struts use upto -4 degrees in the front.

Because of the way these beams work (with none camber gain) you want about the same camber in the rear as in the front!

But measuring the tire temperature is really the only way to know for your car!

[Henry Yorke 269 3 Cars]

309 GTI16's have -1 degree. Not sure how neg camber will impact the passive rear wheel steer on a GTI-6 as it may make it more snappy as the toe-in effectively alters mid corner under lead

Edited December 21, 2006 by Henry Yorke

[Powers 13]

Shine, how did you achieve those figures? Are you able to buy different stub axles in Norway? Thanks for the input.

[cybernck 402 1 Cars]

doesn't toe-in on the rear slow the car down a little bit?

[James_R 3]

they used to run something like 3mm per rim toe-out on the rear wheels only, which greatly improved tyre

heating and turn-in - hope that helps

 

That's part of an e-mail from one of the engineers that built the 306 BTCC's cars.

[phatgti 0]

I run 1mm toe out on my alfa to promote turn in - it's quite lairy on the first race lap until they get warm but if you can hold it then it's amazing.

I run 2-3mm toe out on the front as well with -3 camber and between -.5 and -1 on the rear.

[shine 0]

doesn't toe-in on the rear slow the car down a little bit?

 

Yes, slow down/get a more neutral rear end. As other say, some to-out will help turn in. It's always difficult to find whats best. I've tried to get as much balance in the car, and I was statisfied with the rear end a little bit more stable/neutral.

[shine 0]

Shine, how did you achieve those figures? Are you able to buy different stub axles in Norway? Thanks for the input.

 

I've machined the rear end myself.

[pdd144c 0]

You can buy the modified stubs from somewhere. Skip Brown kit is what I'm using on my car. Can't remember the price off the top of my head now...

[crf450 0 1 Cars]

Thanks for all the input chaps,as I have said I have the arms set up on the machine ATM waiting to be machined,the arm is set as standard with neg camber and toe in but not as much as some of you lot are running.

Cheers Martin