Sigh.

I must be doing it wrong. Good thing I no longer teach mechanical engineering...

When did I say that? Laminar is Re<2000, Turbulent is greater so its of course faster? Maybe I should stop posting when drunk

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

stuff you all, moar doof!

More weight, more choonz for habibz, cool factor goes up, can't loose!

Anyways 10% grip would be nice.

haha,

read back on my build thread. Unless the mod's deleted my posts.

You are totally right in your statement, ofcourse - its what ud expect.

But back to the old argument... regarding the exhaust flow/turbo porting etc

If you had a flow thru a pipe - that was laminar at a certain speed, you WOULD WANT TO make it turblent (artificially) - to allow a lower coefficient of static friction along the pipe (like making kinks and bumps etc in the pipe).

The easiest example i can give would be the modern golf ball - (not exactly flow in a pipe tho)

this is way off topic tho..


back on topic!

Yeah that is a bit off topic I can't remember it, but just remember turbulent flows open a whole other can of worms more than just minor friction losses along a pipe wall. (Also they can be used to your advantage too).

On topic:

That's pretty much what I said wasn't it? High school tells us that F=(mu) x N, so a larger weight (normal force) will have a larger force. But remembering of course you are looking at not just a simple friction problem, but rolling resistances, dynamic, static etc etc etc.

Which is why I said a lighter car would break traction differently to a heavier car. And looking at 10% weight change only (100-150kg), would the changes in forces be that noticeable compared to increasing grip (going from street to race tyres)?

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Ha, am i arguing with a physics professor??? hehe

What do you mean by "different?"


But is the grip from race tyres only 10% more than street tyres??

By different, I mean each vehicle will break traction at different speeds and have different momentum. So then it would come down to driver, track type etc etc to see what is better.

Grip from race tyres can be a lot more than 10% of a street tyre (all depends on the tyres!).

Personally I think the initial question is good if you are sitting around having a couple of beers and a chat. Start looking at the nitty gritty and there are too many variables to sway people each way. End of the day, get yourself 10% more power, 10% less weight and 10% more grip and have a 10% larger smile on your face.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Good call!

I agree with John that as a basic question it is a great question however if you want to get 130 kg out of a car you would almost certainly take some of the rigidity out of it. This leads to more problems if the thing wants to flex a bit more.

Dont get me wrong epic steerer in Mr jones but with him and ruari in the GTR it was 1960kgs. Seemed to change direction pretty well.

Brendon

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Losing is worse than death. You have to live with losing....

most cars would change direction well with approx 1200mm worth of rubber underneath it!! most buses have less than that

... So don't these 2 last statements kind of bring us right back to the point I already mentioned?

You've just said it right there- weight means very little in todays cars, it's the grip that is most useful!???

(Heat that popcorn up anyway Joe- you know I'm good at pushing buttons)

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"...even my Grandma can drive fast in a straight line"