The grip circle.
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Discussion

iloveboost

Original Poster:

1,531 posts

191 months

Friday 14th February 2014
quotequote all
Grip circles are often mentioned on car sites but they seem to be only useful when talking about theoretical g-forces not driving well. Driving well seems to be the ability to load the tyres as fast as the car body moves but no faster so you don't overload the tyres. It seems to have nothing to do with the grip circle. Am I wrong?

conkerman

3,515 posts

164 months

Friday 14th February 2014
quotequote all
Wha?

I hear moscow is nice this time of year.

Kozy

3,169 posts

247 months

Friday 14th February 2014
quotequote all
iloveboost said:
Grip circles are often mentioned on car sites but they seem to be only useful when talking about theoretical g-forces not driving well. Driving well seems to be the ability to load the tyres as fast as the car body moves but no faster so you don't overload the tyres. It seems to have nothing to do with the grip circle. Am I wrong?
Overloading it would be taking it outside the grip circle, no?

pork911

7,365 posts

212 months

Friday 14th February 2014
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grip circle? is that a singleton's valentine?

jon-

16,534 posts

245 months

Friday 14th February 2014
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Apparently there really is no replacement for displacement hehe

Stick Legs

8,933 posts

194 months

Friday 14th February 2014
quotequote all
The problem is that the Torque bubble can seriously harsh the mellow of the grip circle, & don't get me started on the the power trip!
Man that is a buzz when it is right but whoah buddy, watch it 'fore it stings you, know what I mean...


iloveboost

Original Poster:

1,531 posts

191 months

Friday 14th February 2014
quotequote all
You don't have to be patronising or sarcastic because you've misunderstood me.
My point is that the grip circles people commonly reference don't take into account weight transfer only theoretical g-force and they suggest you should neither brake nor accelerate for maximum lateral cornering force and that this is bs unless you have a perfectly neutral car in all conditions and in all corners.
I'm NOT talking about the load vs tyre slip grip circles used in racing games like Forza.
If I appear crazy it is intended to be humorous but that obviously doesn't translate well onto the internet because despite the hints from emoticons biggrin that I'm being sarcastic/funnny sometimes people don't realise.
Thanks.

Upthejunction

108 posts

155 months

Friday 14th February 2014
quotequote all
iloveboost said:
You don't have to be patronising or sarcastic because you've misunderstood me.
You're 100% correct.
Who needs a reason to be patronising or sarcastic


Anyone else never heard of a grip circle?

Guvernator

14,460 posts

194 months

Friday 14th February 2014
quotequote all
Is this the thing that American's always seem to bang on about, lateral G or something? Never got why it was so important but that's all they seem to talk about over the pond when they talk about a cars handling.

Monty Python

4,813 posts

226 months

Stick Legs

8,933 posts

194 months

Friday 14th February 2014
quotequote all
iloveboost said:
You don't have to be patronising or sarcastic because you've misunderstood me.
My point is that the grip circles people commonly reference don't take into account weight transfer only theoretical g-force and they suggest you should neither brake nor accelerate for maximum lateral cornering force and that this is bs unless you have a perfectly neutral car in all conditions and in all corners.
I'm NOT talking about the load vs tyre slip grip circles used in racing games like Forza.
If I appear crazy it is intended to be humorous but that obviously doesn't translate well onto the internet because despite the hints from emoticons biggrin that I'm being sarcastic/funnny sometimes people don't realise.
Thanks.
No offence intended, I get the concept, but as you rightly point out unless there are no other variables it is not that simple.

Suspension geometry and weight distribution have a huge effect, Imagine any semi trailing arm car being faster 'rolling' through a corner than being powered through? There are a lot of variables. The fact that grip circles sounds a bit Troy Queef only adds to it's lack of credibility. wink

LuS1fer

43,517 posts

274 months

Friday 14th February 2014
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American acrs get over-tyred to get the highest g on tests but they also do the largely pointless slalom which generally doesn't correlate.

In reality even if one ccar can pull over a g and the other under a g, no-one will know in 99% of driving unless you're going to be pinning the throttle on a race track every day.

Americans just like big figures they can aim for and beat, never see that it has much point. They even fit a g meter in the Corvette HUD.

HumbleJim

29,007 posts

212 months

Friday 14th February 2014
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I think you are possibly talking about the Kamm Circle. Used by engineers to demonstrate theoretical grip.

It's quite usefull to illustrate why breaking and cornering (for instance) at the same time are a a bad idea.

Ozzie Osmond

21,189 posts

275 months

Friday 14th February 2014
quotequote all
HumbleJim said:
I think you are possibly talking about the Kamm Circle.
Sounds like one of those expressions it's best not to Google for images unless you have the parental controls fully activated...

HumbleJim

29,007 posts

212 months

Friday 14th February 2014
quotequote all
Ozzie Osmond said:
HumbleJim said:
I think you are possibly talking about the Kamm Circle.
Sounds like one of those expressions it's best not to Google for images unless you have the parental controls fully activated...
I double dare you (it's quite boring really)

nickfrog

25,339 posts

246 months

Friday 14th February 2014
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For me lateral acceleration is one of the most important features of a car and I wish European journos/testers gave it more prominence. It's far easier to use all of the lat grip performance of a car in safety than even a portion of its power on the open road. And far more fun IMO.