Friday night topic - most power through most narrow tyres
Discussion
kambites said:
speedtwelve said:
Years ago when I had a Lancia Delta HF Turbo it was putting (as standard) 140bhp/140 lbft through factory-spec 165 section tyres. Even for the late 80s it was a tad undertyred...
Surely it was putting it through all four wheels though? That's cheating. PhillipM said:
Your teacher lied to you. Sorry, they all do it.
I'm gonna go for anything group B on ice tyres...
Ice is a little different. For the road then narrow or wide tyres the actual grip is the same. Max acceleration a = u g coefficient of friction of the tyre x gravity. If you want more then wings help a lot as they push down into the tyres.I'm gonna go for anything group B on ice tyres...
Edited by delta0 on Friday 24th July 23:32
delta0 said:
Ice is a little different. For the road then narrow or wide tyres the actual grip is the same. Max acceleration a = u g coefficient of friction of the tyre x gravity. If you want more then wings help a lot as they push down into the tyres.
Afraid not, tyres are a viscoelastic system and they also have some chemical bonding going for them, mu is not a fixed constant irrespective of load anywhere outside of a perfect physics simulation, neither is the contact patch size constant given the respective stiffness of the sidewalls and loading.PhillipM said:
Afraid not, tyres are a viscoelastic system and they also have some chemical bonding going for them, mu is not a fixed constant irrespective of load anywhere outside of a perfect physics simulation, neither is the contact patch size constant given the respective stiffness of the sidewalls and loading.
u does change according to load and temperature definitely (and that can be modelled). That's why you get much higher u from racing slick tyres with a softer compound but when you do exceed the grip and they slip typically more than 5% then u falls dramatically. Road tyres are a little less of a cliff edge than that fortunately!234mph in 5,9 sec on the quartermile.................on 10.5 tires :
http://www.yellowbullet.com/forum/showthread.php?t...
Amazing what can be achieved with those skinny rubbers.
http://www.yellowbullet.com/forum/showthread.php?t...
Amazing what can be achieved with those skinny rubbers.
speedtwelve said:
Years ago when I had a Lancia Delta HF Turbo it was putting (as standard) 140bhp/140 lbft through factory-spec 165 section tyres. Even for the late 80s it was a tad undertyred...
Yes indeed, I remember them well - a friend had a few after he got fed up of fast Stradas - they used to literally 4 wheel drift in fast corners. The earlier ones had less power and slightly wider tyres ...and, as usual, most posters have missed the question.
The topic is in the current tense - who drives a car with skinny tyres?
Gandahar said:
...which man, or lady, drives a car with skinny tyres and large bhp through the driven wheels?
Is there anyone with more than 200 bhp with less than a 205 for instance?
I am sure there is. Show us your metal. Or rather lack of it.
Easy to go back 40-50-60 years and say "Ooo - look at those skinny tyres!" FFS they were all like that!Is there anyone with more than 200 bhp with less than a 205 for instance?
I am sure there is. Show us your metal. Or rather lack of it.
The topic is in the current tense - who drives a car with skinny tyres?
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