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 Post subject: Handling vs Road Holding
PostPosted: Sat Mar 31, 2007 11:01 am 
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1360cc
1360cc

Joined: Mon Jan 16, 2006 7:59 pm
Posts: 11749
Many people are throwing wide sticky tyres on their cars in an effort to improve road holding.

Is this having a detremental effect on handling especially on the limits of adhesion or is the road holding limits now so high that by the time the car communicates its intention to display that laws of physics are true you half way up a tree anyway?


I am finding that the cars I am driving with fab-o road holding do not communicate well and so I consider poor handling.


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 Post subject:
PostPosted: Sat Mar 31, 2007 11:58 am 
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998cc
998cc
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Joined: Thu Aug 25, 2005 3:23 pm
Posts: 505
Location: Canberra
Now theirs two things i would like to share and that's

inertia. The spinning of a mass (flywheel, brake disk or wheel) creates a gyroscopic affect. once this gyroscopic affect starts the mass wants to continue spinning on the axis in that direction. This creates drama's in both braking and turning because the wheels are fighting the change. This equates to heavy steering, and bad braking

This is more noticeable the bigger you make the wheels as it pushes the weight of the wheel and tire even further out from the centre and since F=MxA and M=FxD this creates a much more amplified feeling of inertia. This takes me to weight.

weight
This change in weight from small wheels to large wheels changes the weight imposed on the suspension known as 'unsprung weight'
this makes a dramatic change on the forces in the suspension and therefore the common shocks and suspension components aren't enough to keep it on the road evenly. this equates to wandering steering and lock up's while braking as the wheel is not in full contact with the road.

I think that most people fit them for a 'fat' look are disappointed because the car's slower off the mark, harder to stop and don't have that chuckability anymore

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I have fitted 13x7's to my 4EFTE ute more for traction than anything else.
I am going to use big vented brakes and I have nolothane bushes throughout and Koni's with adjustable camber and Castor bars with hi-lo's. I am hoping with all this I will have handling and bit more grip. But I can do the math's the 13x7 superlight's are about 5x heavier and their weight's in the outside too

EDIT: ME STOOPID (had a bit of a big one last night and it hurts to think :oops:

_________________
-doing a Degree in Mechanical Engineering,
and a few conversions:
13B Extend in a 1600
4EFTE in a mini ute (all slowly)


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