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Old 5th January 2011, 23:26   #76
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Rehash, what do u mean by the lightest spot. Can u explain please ?
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Old 6th January 2011, 12:13   #77
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

@carbofibre, i'm just gonna quote from CARBIBLES : Wheel & Tyre Bible as they do a great job of explaining this :

Quote:
Originally Posted by Carbibles

Coloured dots and stripes - whats that all about?

When you're looking for new tyres, you'll often see some coloured dots on the tyre sidewall, and bands of colour in the tread. These are all here for a reason, but it's more for the tyre fitter than for your benefit.
The dots on the sidewall typically denote unformity and weight. It's impossible to manufacture a tyre which is perfectly balanced and perfectly manufactured in the belts. As a result, all tyres have a point on the tread which is lighter than the rest of the tyre - a thin spot if you like. It's fractional - you'd never notice it unless you used tyre manufacturing equipment to find it, but its there. When the tyre is manufactured, this point is found and a coloured dot is put on the sidewall of the tyre corresponding to the light spot. Typically this is a yellow dot (although some manufacturers use different colours just to confuse us) and is known as the weight mark. Typically the yellow dot should end up aligned to the valve stem on your wheel and tyre combo. This is because you can help minimize the amount of weight needed to balance the tyre and wheel combo by mounting the tyre so that its light point is matched up with the wheel's heavy balance point. Every wheel has a valve stem which cannot be moved so that is considered to be the heavy balance point for the wheel. (Trivia side note : wheels also have light and heavy spots. Typically the heaviest spot on the wheel is found during manufacture and the valve stem is then located diametrically opposite that point to help balance the wheel out).
As well as not being able to manufacture perfectly weighted tyres, it's also nearly impossible to make a tyre which is perfectly circular. By perfectly circular, I mean down to some nauseating number of decimal places. Again, you'd be hard pushed to actually be able to tell that a tyre wasn't round without specialist equipment. Every tyre has a high and a low spot, the difference of which is called radial runout. Using sophisticated computer analysis, tyre manufacturers spin each tyre and look for the 'wobble' in the tyre at certain RPMs. It's all about harmonic frequency (you know - the frequency at which something vibrates, like the Tacoma Narrows bridge collapse). Where the first harmonic curve from the tyre wobble hits its high point, that's where the tyre's high spot is. Manufacturers typically mark this point with a red dot on the tyre sidewall, although again, some tyres have no marks, and others use different colours. This is called the uniformity mark. Correspondingly, most wheel rims are also not 100% circular, and will have a notch or a dimple stamped into the wheel rim somewhere indicating their low point. It makes sense then, that the high point of the tyre should be matched with the low point of the wheel rim to balance out the radial runout.


What if both dots are present?

Generally speaking, if you get a tyre with both a red and a yellow dot on it, it should be mounted according to the red dot - ie. the uniformity mark should line up with the dimple on the wheel rim, and the yellow mark should be ignored.
^^ Didn't see a red dot on the tyres.

Also, I have no idea how many grams the difference in required balancing weights would be if the yellow dot was mounted at the valve stem vs diagonally opposite. Would be interesting to know.

cya
R

Last edited by Rehaan : 6th January 2011 at 12:32.
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Old 7th January 2011, 21:26   #78
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Many thanks Rehaan. Very interesting
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Old 8th January 2011, 16:36   #79
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Yellow wheel-spokes, I do not approve of. But the rest of it is a stonker, honest! Lovely and refreshing, the coat of yellow on a Ferrari is. Not to mention the ready-to-pounce stance!
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Old 9th January 2011, 15:23   #80
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

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Originally Posted by suhaas307 View Post
Yellow wheel-spokes, I do not approve of. But the rest of it is a stonker, honest! Lovely and refreshing, the coat of yellow on a Ferrari is. Not to mention the ready-to-pounce stance!
i too dont quite find the yellow "inserts" amusing.. but the rest is just sub zero!!
that yellow is the best colour on the 458 IMO.. i find it even better than the red!!
now time for some akrapovic exhausts to tear our ears off!!
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Old 9th January 2011, 15:40   #81
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

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i too dont quite find the yellow "inserts" amusing.. but the rest is just sub zero!!
that yellow is the best colour on the 458 IMO.. i find it even better than the red!!
now time for some akrapovic exhausts to tear our ears off!!
Absolutely! Love the yellow paint-work, and coupled with black wheels, the 458 is a stunner! But why Akrapovic exhausts? I'd go in for traditional Tubis instead!
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Old 9th January 2011, 18:14   #82
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Thannk you for posting a close up of those wheels. I needed that as I am recreating his car in 1:18 format and wanted to know if the whole wheel is yellow of just the grooves! So Thank You.
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Old 9th January 2011, 20:50   #83
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Quote:
Originally Posted by suhaas307 View Post
Absolutely! Love the yellow paint-work, and coupled with black wheels, the 458 is a stunner! But why Akrapovic exhausts? I'd go in for traditional Tubis instead!
well i havent heard any 458s on tubis yet..

and take a load of this!!


Cheers!!
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Old 9th January 2011, 20:57   #84
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Cause akras are fully titanium and save alot of weight and add more power and save weight. Rather than just noise... More go, leas show...
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Old 10th January 2011, 00:10   #85
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

I don't know about you guys, but the front of the 458 is UGLY. Seems like a concept car gone wrong. Thats the only qualm i have about the car.
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Old 10th January 2011, 11:11   #86
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

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I don't know about you guys, but the front of the 458 is UGLY. Seems like a concept car gone wrong. Thats the only qualm i have about the car.
You bet !
The F430 was very clean in its looks. If we read the initial comments on F458, you will find that majority of the population on this forum and else-where found it ugly. Post launch when the performance reviews were out, there were many converts because of the bump in horsepower over the F430 + the obviously better performance.

As many predicted, the design may grow on you. Well, it didn't in mine and your case.

Personally - I would go a little far in admitting that had this not been a Ferrari or some other not so big brand, it wouldn't have been such a success story.
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Old 10th January 2011, 11:35   #87
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Quote:
Originally Posted by bivin View Post
well i havent heard any 458s on tubis yet..

and take a load of this!!

Cheers!!
Quote:
Originally Posted by insideman View Post
Cause akras are fully titanium and save alot of weight and add more power and save weight. Rather than just noise... More go, leas show...
I'm sold!

Akrapovics on the 458 sound fantastic! I think I just had a crisis! I thought only Tubis could recreate the magical Ferrari noise, but Akrapovic has done a superb job!

I've heard Akras on a 997 Carrera and it makes every other 911 sound pedestrian!
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Old 10th January 2011, 14:40   #88
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

as far as i am concerned, the 458 is by dar the finest car Ferrari have ever made.
nothing even comes close.....
as far as the looks are concerned, ots of cars are termed ugly when they launch, but the looks grow on you.
in terms of technology, i dont belive there is any car out there that can match the 458 ......
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Old 10th January 2011, 22:25   #89
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Quote:
Originally Posted by dipen View Post
You bet !
The F430 was very clean in its looks. If we read the initial comments on F458, you will find that majority of the population on this forum and else-where found it ugly. Post launch when the performance reviews were out, there were many converts because of the bump in horsepower over the F430 + the obviously better performance.

As many predicted, the design may grow on you. Well, it didn't in mine and your case.

Personally - I would go a little far in admitting that had this not been a Ferrari or some other not so big brand, it wouldn't have been such a success story.
Agreed.

Its just like one of things. An ugly chick with an awesome personality (Even though Patrick Bateman would disgaree in saying there is no such thing as a chick with a good personality...but thats off topic).
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Old 11th January 2011, 23:34   #90
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Default re: Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!

Saw this some days ago. A few pics.

Ferrari F458 Italia in Mumbai! EDIT: 458 Pics on pg2 + VIDEO pg7!-img01305201101091631.jpg

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