Front Camber on a SR3

[Ron V]

Hi Guys,

What are you guys running. Everything the Big R has points to 3.5 negative. My tire temps say that is too much.

What do you guys run?

Thanks!

Ron

[Simon T]

Whilst you can compare you will not get a true picture as type temp is also linked to tyre construction, make and pressure. Damper stiffness, toe and roll stiffness.

are you referring to front or rear?

Simon

[Ron V]

Hi Simon,

The Front is my main concern. My rears are coming out ok.

I recently switched from Hoosiers to Dunlops. I have 0 toe on the front, the 19.5mm Sway bar, and the single adjustable Intrax set to +3.

I am seeing 40deg differences from inside to outside on the tire. According to Dunlop this is Waaaaay too much.

I just want to get an idea of what settings guys have found that work to keep the tire temps in check.

Thanks for any help.

Ron

[splitpin]

Ron V said:

I recently switched from Hoosiers to Dunlops. I have 0 toe on the front ........

With Radical Dunlops, no front toe can't be right can it? Isn't the starting point 2-3mm overall toe-out?

[SportsLibre]

splitpin said:

toe-out?

[splitpin]

SportsLibre said:

splitpin said:

toe-out?

Yes in the the case of the front wheels, exactly that, toe out; as in "Negative toe, or toe out, is the front of the wheel pointing away from the centreline of the vehicle".

Mind you 15 years on, perhaps Radical don't know what they are talking about when it comes to setting up the cars they make?

Feel free to read the latest version here http://www.radicalsportscars.com/global/SR3_manual...

Edited by splitpin on Friday 26th September 23:07

[Simon T]

splitpin said:

With Radical Dunlops, no front toe can't be right can it? Isn't the starting point 2-3mm overall toe-out?

Yep

[bloberoo]

yep, toe out 100%, had a tyre reading lesson from someone very high up in The Company ...
His Surname kind of led to me to listen to every snippet :-).

[Ron V]

I love the way the car turns in with 0 Toe, sharp and precise. I know the recommended settings and my way there is less rolling resistance.......another topic of great importance with the Big R apparently.

I will try it with 1mm total toe out and see if that changes/stabilizes the tire temps.

However, I still think 3.5 deg negative camber on the front is too much.

Ron

Edited by Ron V on Monday 29th September 21:38

[Coldaswell]

I didn't check the set up on my SR3 when I bought it. It was very unstable on the brakes, back end wanting to overtake the front, and unstable at speed. Good for adrenaline but bad for trousers. As I hadn't driven anything like this type of car before I wasn't sure what to expect either.
Took it to radical for some other stuff and got it set up. Turns out it had the correct toe but in instead of out.

As for the camber, I don't run slicks so a direct comparison would be wrong but with all else equal, I'm now running half the camber on the front with a different manufacturer of tyre, same radial type construction. Even that might need at week less too. I was surprised how different it could be.

[Simon T]

FWIW I was running 4deg neg on the front and 1.75 neg on the rear. 3mm total toe out on the front and 2mm toe in on the rear measured as the difference between the front and rear of the rim at the horizontal centre line of the wheel

Simon

[Ron V]

Thats exactly what I wanted to know. Thanks Simon.

4 Deg neg on the front, wow. At 3.5 I have huge wear on the inside marker and not much on the outer one at all. and temp differences of more than 30C in most cases.

More test time needed I suppose. The Hoosiers were Super easy to run. No tire temp info and very forgiving. And for what its worth I think I may like the Hoosiers better at this point. The car feels VERY Stuck to the track compared to the Dunlops.

Ron

Edited by Ron V on Wednesday 1st October 00:06

[MindBend]

Running Hoosiers here and like 3-3.5 up front (SR8).
Love them as compared to Dunlop. Wear great and stick is awesome!

[splitpin]

Ron V said:

4 Deg neg on the front, wow. At 3.5 I have huge wear on the inside marker and not much on the outer one at all. and temp differences of more than 30C in most cases.

Huge wear on the inside and hardly any on the outside, well I've seen loads and loads of Radical Dunlops over the years and that's a first for me.

To rule out the very unlikely possibility that something associated is seriously amiss, I can only recommend that you put it exactly on the factory recommended settings and see what happens: if a Radical is set up correctly all round on properly fresh Radical Dunlops in combination with sound suspension and damping components (Intrax single adjustables probably just about qualify ) then the limiting factor on lap times will only be the driver ......... there are a lot of good SR3 pilots over here but there are only a handful (mostly essentially Pros) who can extract the maximum an SR3 is capable of delivering.

You may well ultimately have a preference for running on Hoosiers, but I think that is a red herring in context of the present problems; i.e. that would not explain why your Radical Dunlops aren't performing as they should and indeed do for many others.

Edited by splitpin on Wednesday 1st October 12:53

[BertBert]

splitpin said:

there are a lot of good SR3 pilots over here but there are only a handful (mostly essentially Pros) who can extract the maximum an SR3 is capable of delivering.

As a complete aside, and certainly not being in the camp of good SR3 pilots, I was amazed about how much the SR3 would give. It seemed the better I got and the harder I drove it, the more there was to come! Shame the budget-limiter kicked in and I had to desist!

Bert
PS sorry for the thread hijack!