Front Tyre Wear

[Smoke them tyres]

Just swap it the other way round though....adding the rear bar increases understeer.

At or past the limit, a stiff rear bar may then cause the car to go into snap oversteer once the rear grip limit is exceeded....compliance and controllability at the limit are then the issue.

But as a rule, understeer will be how these cars will respond.

Edited 18/11/10 12:34 PM by Smoke them tyres

[nelsonian101]

Don't you guys already have your understeer thread as a sticky?

Thought this one was about front tyre wear.

[Guest XR09]

  On 18/11/2010 at 9:34 PM, nelsonian101 said:

Don't you guys already have your understeer thread as a sticky?

Thought this one was about front tyre wear.

LOL ok. Front control arm bushed are soft and good for about 20,000k's. When they start wearing the lower control arm cannot do its job properly and the tire will not sit square on the road during load. Causing the inner to wear prematurely.

Personal I have my alighnment done every 5,000k's or so. Prob a bit much but I am over not getting any life out of my tires. And I have been playing with different ride hights.

[Smoke them tyres]

It mostly is, isn't it?

[Guest XR09]

If they gripped and did not understeer so much they would not wear so badly There not that bad @ understeer. But they love a goodyear, mash and peas for dinner.

[2MUCHKW]

  On 17/11/2010 at 2:23 AM, senna_T said:

Replacing the lower inner control arm bushes on the B-Series makes a huge difference to tyre wear.

Te standard lower inners are very soft from the factory - they are rubber with a gel centre (kinda like doughnuts at the servo!). They are great for reducing NVH levels and giving a comfortable ride, but rubbish for any sort of performance.

Under braking the rubber flexes and the arms can move out up to 10-15mm each side - this in turn creates a Toe out effect, wearing tyres and causing the tram-lining effect you feel on rutted roads.

Alignment can reduce this by starting off with a toe-in static setting of around +2, that way once under way and with some braking the toe out and tram-lining effect will be reduced.

Hey Senna,

Im getting all front control arm bushes replaced this Wed on my BF Typhoon.

What L & R Camber and what L & R Toe settings does Wholesale Suspension typically wheel align BF Typhoons too with stock OEM suspension?

My car has been badly wearing the inner edges of both fronts the drivers side the worst!

Presently my L Toe has been +0.7mm and R Toe has been +0.8mm

Presently my L Camber is - 0 54' and R Camber is - 0 56'

Presently my L Castor is +7 11' and R Castor is +6 59'

Cheers

Edited 29/01/11 02:41 PM by 2MUCHKW

[johnt]

I have had this problem & found the solution - it is caused by incorectly set toe in - some tyre fitters are using plain falcon settings on XRs - the less toe in (or worse, some toe out), the more the inner edge of the tread & shoulder will wear.

I had a set of front tyres that only lasted 16,000km - I expect 40,000km - when the replacements were fitted, I asked them to measure the wheel alignment before they started & they found the toe in/out was 0.03 degrees toe out.

Less toe in makes the steering more sensitive or twitchy on freeways & increases the dry weather front end grip / oversteer = you can hit lower speed bends like you are on rails - the rear lets go first.

It also increases the rearward load on lower front suspension bushes.

More toe in provides the opposite.

In wet weatther, all bets are off - you may oversteer or understeer, depending on road surface, tyre pressures & wear, driver's right foot.

As per the manua,l for the BA series sedans:

A plain falcon has between 0.02 degrees toe out & 0.18 degrees toe in, with 0.08 degrees toe in optimum.

An XR Falcon has between 0.06 degrees toe in & 0.26 degrees toe in, with 0.16 degrees toe in optimum.

Toe out is fun, although expensive - I have never gone through Galston Gorge (northern Sydney) as fast or as easily as with the toe out setting.

JohnT.