New Rims

[IH8TOADS]

get 19's or 20's. I got black 20's and love em!! Rims on a T seem to look an inch smaller than what they really are.... especially up close.. wierd!! maybe I'm getting used to bigger wheels. My insurance SGIO allowed 20's so I'd be worrying about this more than warranty.

[Dagabond]

  ford268 said:

ford say

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When you say "Ford say" do you mean Ford HQ or the knob on the floor at the dealership who sold you a motor vehicle but hasnt got a friggin clue about what it is he-she has actually sold to you....

They stand around all day with there head up there buttocks waiting to sting some poor bugger out of a bit of hard earned, you'd reckon the mongrels could take a few hours outa there day to research exactly what it is there slingin into somebodies hands....

But no there to far entrenched down the back office backstabbin and laughin there arses off at the silly friggin price they've just conned out of the last punter....

[ford268]

the guy who sold me it told me.. I will check again from someone else, another thing, is it true that having 19s you will loose 20 rwkw..

[cooltint]

  ford268 said:

the guy who sold me it told me.. I will check again from someone else,  another thing, is it true that having 19s you will loose 20 rwkw..

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What possible difference could it make if the rolling circumference is still the same ie by way of lower profile tyres.

Doesn't seem to have hurt my car any.

Big AL

Edited 20/03/07 02:04 PM by cooltint

[turtle33]

  ford268 said:

they reckon any bigger than 18s and it void warranty.. I have seen the phoons in octane with black rims and they look awsome.. do yous reckon that 18s are too small..

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get it in writing from the tool who told you then fax it to the dealer principal.

Edited 20/03/07 02:35 PM by turtle33

[Evil F6]

What about all those poor guys with BF II F6's, as they only have 19" wheels now. Damn, voided warranty from the factory.

[TurboDewd]

  ford268 said:

the guy who sold me it told me.. I will check again from someone else,  another thing, is it true that having 19s you will loose 20 rwkw..

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LOL

r u asking these questions with a straight face?

if you can afford an F6 I would presume you have a fair head on your shoulders therefore shouldnt need to ask all these ridiculous questions youre asking.

I used to think there is no such thing as a dumb question...not Im not so sure.

Are you sure youre not from LS1.com.au and trying to make us Ford fellas look stupido?

[jordak]

  TurboDewd said:

  ford268 said:

the guy who sold me it told me.. I will check again from someone else,  another thing, is it true that having 19s you will loose 20 rwkw..

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LOL

r u asking these questions with a straight face?

if you can afford an F6 I would presume you have a fair head on your shoulders therefore shouldnt need to ask all these ridiculous questions youre asking.

I used to think there is no such thing as a dumb question...not Im not so sure.

Are you sure youre not from LS1.com.au and trying to make us Ford fellas look stupido?

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Don't listen to him, he's still pissed about the failed boob job

As for the salesman, chances are he was either jealous that you were in the process of buying something that he only gets to clean, didn't have any rims to sell you or more likely than not, just a NOB!

As already said 19's wont void your warranty.

Nor will they rob you of 20rwkw either. But hey even if they did you only need to go down the rd and see another D!ickhead salesman in the exhaust shop and he'll gurantee you an extra 40rwkw by installing a nice new shiny exhaust system.

[aiboart]

  cooltint said:

  ford268 said:

the guy who sold me it told me.. I will check again from someone else,  another thing, is it true that having 19s you will loose 20 rwkw..

←

What possible difference could it make if the rolling circumference is still the same ie by way of lower profile tyres.

Doesn't seem to have hurt my car any.

Big AL

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If tyre circumference is the same for the 19” and 18” wheels - gearing is unaffected.

However this is not about gearing... this is about geometry, mass and energy.

Think of it this way,

Road wheels behave as flywheels that soak up and store energy. (and so do brake discs and anything else in the driveline for that matter…)

If you want to use the engine power (FWKW) to accelerate those (fly)wheels round and round (and forward when on the road), that’s fine...

...but...

to reach any given wheel RPM (or roadspeed) you really want those (fly)wheels soaking up the least amount of energy possible, that leaves more power (RWKW) from the driveline to accelerate the rest of the car…. forward. (or the dyno roller around and around)

1 (geometry) If you went from the 18” to a 19” version of a wheel and the design and the materials remained the same, the mass of the rims in the 19” wheel is distributed further out from the centre than the mass of the 18” wheel. So while the outside diameter of this 19” and the 18” wheel and tyre combo is the same, the metal in the rim of a 19” wheel is traveling faster than the metal in the rim of an 18” wheel at any given wheel RPM.

Therefore, it takes more energy to get the 19” rim to the same wheel RPM as the 18”rim.

Hence, the 19” rim accelerates more slowly for any given FWKW; hence, the dyno registers less RWKW.

Remember, the dyno is actually measuring the acceleration of the rear wheels; anything that impedes acceleration shows up as a reduction of RWKW.

2 (mass) The 19” version of any given wheel design is obviously heavier than the 18” version.

So not only is the metal in the 19” rim traveling faster for any given tyre RPM, there is actually more metal going round in the rim in the first place.

Therefore, it takes more energy to get the 19” rim to the same wheel RPM as the 18”rim.

Hence, the 19” rim accelerates more slowly for any given FWKW and the dyno registers less RWKW.

Extra wheel weight also shows up as simply… weight in the car.

The dyno will pick up the effect of an increase in rotational mass or polar moment as a reduction of RWKW.

The forward acceleration of the car however will additionally be affected by the increased mass of the wheels.

So in short, in going from 18” to 19” rims

Will it slow you down? In general, yes, unless you use true lightweight rims.

Will it decrease RWKW by 20KW as measure by a dyno? N.I.

Will it decrease RWKW as measured by vehicle acceleration times? N.I. but the effect will be more pronounced than the dyno reading.

Regards,

aa

Edited 21/03/07 08:05 AM by aiboart

[ford268]

thanks for that. the only reason I ask if it reduces by 20rwkw is because I read it ont his site.. I think it was a pretty old forum but it came from someone on here.. thanks anyway for all your info and I will be sure to contact ford and see what the go is.. considering they did sell me a car that was actually already sold.. and then another that had hail damage.. and finally third time I got it