Does GT takes Earth gravity difference into account?

[Flash3001]

Does GT or any other racing simulator take into account the difference in gravity between spots in Earth?

 

[polysmut]

Does GT or any other racing simulator take into account the difference in gravity between spots in Earth?

Surely it's a minimal difference & is somewhere around "g"(the acceleration towards the Earth's centre of mass being approximately 9.81 metres per second squared) at all points on the Earth's surface?

There are about 3 tracks in GT6 with lower gravity than that. They aren't on Earth though.

 

[Il_Conte_Sky]

It could have a point on a hillclimb like Pikes Peak...otherwise I think that's not a real relevant factor in a driving/racing simulator...

 

[Ryk]

Didn't notice anything close to the Mascons on the Moon missions in the old Lunar Rover.

But it would make for a great excuse if you missed a target time, I wasn't that you were too slow, it was that the gravity was too high and time slowed down.

 

[Famine]

Does GT or any other racing simulator take into account the difference in gravity between spots in Earth?

GT6 has three events on the Moon.

 

[GTPorsche]

Air density is not the same as gravity. Those are two very different forces.

 

[Flash3001]

GT6 has three events on the Moon.

I'm aware of that.
Changed the title to correspond to the real question.

 

[Flash3001]

Surely it's a minimal difference & is somewhere around "g"(the acceleration towards the Earth's centre of mass being approximately 9.81 metres per second squared) at all points on the Earth's surface?

There are about 3 tracks in GT6 with lower gravity than that. They aren't on Earth though.

I'm not an expert. But if we take an BMW M4 weighting 3530 lbs, or 1601.18 KG.

Let's suppose it was weighted in Quito, Ecuador. If we move it to Oslo, Norway it would weight 1608.79 KG. A 7.61 KG difference.

Gravity in Oslo: 9,819126
Gravity in Quito: 9,772632

If it were Gold it would be a US$ 267,839.53 difference. kkkk

Sources:

http://www.bmwusa.com/Standard/Cont...Features_and_Specs/M4CoupeSpecifications.aspx

http://goldprice.org/

http://www.grupocalibracao.com.br/download.aspx?idAttribute=artigo_arquivo&idContent=1241

 

[Famine]

I'm aware of that.
Changed the title to correspond to the real question.

I'm not entirely sure it would be necessary for the game to do that.

The effective gravity at the Earth's surface is between 976 and 983 gal - a difference of around 0.7%, or 7kg for every tonne - but that's at extremes. Have a look at numbers near race tracks in the game:
Tokyo: 980 gal
LA: 980 gal
Melbourne: 980 gal
Rome: 980 gal
Frankfurt: 981 gal
London: 981 gal
Brussels: 982 gal

A 0.2% difference, or 2kg/tonne. The heaviest cars in the game would vary by 4kg (actually marginally less) from lowest to highest.

The effect of altitude is about 0.3 milligal/metre, so unless you're planning on doing a race on a track higher than Everest (8848m = 2.7 gal), that's even less significant.

 

[Beeblebrox237]

The mass, in kilos, wouldn't change. A kilogramme is a measurement of mass, not weight. Weight is measured in Newtons, or pounds if you prefer. I'm surprised you didn't mention this, @Famine.

 

[Famine]

The mass, in kilos, wouldn't change. A kilogramme is a measurement of mass, not weight. Weight is measured in Newtons, or pounds if you prefer. I'm surprised you didn't mention this, @Famine.

Yeah, but in the game "kg" is shorthand for "kg equivalent force". You can see that in the torque figures too, listed in lbft and kgm, rather than lbfft and kgfm.

 

[Beeblebrox237]

Yeah, but in the game "kg" is shorthand for "kg equivalent force". You can see that in the torque figures too, listed in lbft and kgm, rather than lbfft and kgfm.

I know this is true for torque figures but I wasn't aware that it was also true for the vehicle weights. If it is true then they really ought to label them correctly since they have, apparently, labelled a weight value as a mass.

 

[Famine]

I know this is true for torque figures but I wasn't aware that it was also true for the vehicle weights. If it is true then they really ought to label them correctly since they have, apparently, labelled a weight value as a mass.

They have since GT1, as I recall. Always been weight in kg or lb.

Of course since gravity is so relatively consistent over the Earth's surface, it usually doesn't matter all that much - a 10000N car is ~tonne pretty much everywhere - but the LRV-001 is of course labelled with a weight in kg (210kg) and should really be listed as a 210kg mass, given its significantly reduced weight in lunar gravity.

 

[notStig]

Yeah, but in the game "kg" is shorthand for "kg equivalent force". You can see that in the torque figures too, listed in lbft and kgm, rather than lbfft and kgfm.

Interesting because my game actually displays torque as mkgf. Maybe it has something to do with the region?

I know this is true for torque figures but I wasn't aware that it was also true for the vehicle weights. If it is true then they really ought to label them correctly since they have, apparently, labelled a weight value as a mass.

Yes, but in this case it's for ease of understanding. While it's technically incorrect, the general public usually calls what is mass, weight. It's an "acceptable" mistake if you're just giving information to the public. You can also see this on the technical specifications for cars in real life.

 

[Thematic]

Yes, but in this case it's for ease of understanding. While it's technically incorrect, the general public usually calls what is mass, weight.

Which is sloppy since it's difficult to see where the misunderstanding crops up.

 

[quatschkopp]

Does GT or any other racing simulator take into account the difference in gravity between spots in Earth?

GT6 is "in theory" very well aware of gravity.
I don't know if it takes different spots on earth (or any other spots on the moon) into account. But, it should theoretically (I never researched that stuff) be aware of:

"AccelerationOfGravity" (where the only values I can see are 1.63 and 9.8)
plus
"Altitude"/"Latitude"/"Longitude" for every track.
Again, I'm not sure if these values are being used to fully measure the gravity on that spot wherever, or if they're just used to present some nice Information for the user loading the track or whatnot.

They have since GT1, as I recall. Always been weight in kg or lb.

Of course since gravity is so relatively consistent over the Earth's surface, it usually doesn't matter all that much - a 10000N car is ~tonne pretty much everywhere - but the LRV-001 is of course labelled with a weight in kg (210kg) and should really be listed as a 210kg mass, given its significantly reduced weight in lunar gravity.

Now this is interesting, as my source for data says exactly "210" for the "Weight" of the LRV. Whatever measure it really is, I don't like to get into details like that with you again

Interesting because my game actually displays torque as mkgf. Maybe it has something to do with the region?

No. PD are using some specific measures internally, and these are then converted into any other measure. At least to my knowledge..

 

[Flying Kiwi]

 

[yewles1]

It feels like it at Matterforn...

 

[eran0004]

The difference in gravity on Earth has no effect on performance, so why would it be important to take it into account, and how can we tell if it does that?

 

[Vegard]

The difference in gravity on Earth has no effect on performance

It would have some effect, but it's so small that it's negligible.

 

[Famine]

Now this is interesting, as my source for data says exactly "210" for the "Weight" of the LRV.

That'll be why I said that figure and why it's in GTPEDIA.

 

[Beeblebrox237]

They have since GT1, as I recall. Always been weight in kg or lb.

But kg isn't a measurement of weight. Mass is directly proportional to weight, as per Newton's second law, but refers to a different set of properties.

Of course since gravity is so relatively consistent over the Earth's surface, it usually doesn't matter all that much - a 10000N car is ~tonne pretty much everywhere - but the LRV-001 is of course labelled with a weight in kg (210kg) and should really be listed as a 210kg mass, given its significantly reduced weight in lunar gravity.

👍

 

[Famine]

But kg isn't a measurement of weight. Mass is directly proportional to weight, as per Newton's second law, but refers to a different set of properties.

Yup. Of course Gran Turismo isn't alone in this regard. Almost no game I know that displays vehicle parameters has mass in lb or kg - always weight.

As mentioned, it's just shorthand for "kilogram-equivalent force at 1g" anyway.

 

[dr_slump]

- a 10000N car is ~tonne pretty much everywhere

You probably wanted to say the right thing, but it's actually the other way round. Force is what changes, not mass.
Otherwise the car would've to lose and gain ballast constantly.

 

[Famine]

You probably wanted to say the right thing, but it's actually the other way round. Force is what changes, not mass.

It's the same either way round - I didn't say what quantity would change...

A car that weighs (exerts downward force of) 10,000N would "weigh" (have a mass of) ~tonne* pretty much anywhere on the planet. On some parts of the planet, the ~tonne car would weigh (exert downward force of) 10,020N and on some parts it would weigh (exert downward force of) 9950N, but pretty much anywhere it would weigh (exert downward force of) 10,000N

*That would require a car with a mass of 1,019kg, give or take a few significant figures

 

[dr_slump]

@Famine
So in this case you weren't talking about one particular car, but instead of any car without defined mass.

EDIT:
Always these edits... missing half of it.

 

[VBR]

GT6 has three events on the Moon.

 

[eran0004]

It would have some effect, but it's so small that it's negligible.

In theory it would have a microscopic effect, but in practice you wouldn't be able to tell the difference.

 

[Vegard]

In theory it would have a microscopic effect

in practice you wouldn't be able to tell the difference

Hence; negligible.

 

[eran0004]

Hence; negligible.

No difference = no effect.