Tyre Widths?

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AERO_HDT
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AERO_HDT
Does PD factor in the varying width of tyres when modelling cars? It seems to me that the feel of a racing tyre is a standard "X" amount of grip for every car, the same for sports and road tyres.

Does PD model in the fact that a Lexus has 265 series rubber on the rear end and a Viper has 335? because if you ask me, the tyres feel like 'one size fits all' and the different grip levels each car has come down to torque at the wheels and weight shift at any given point whilst driving.

Anyone else think this is the case?
 
Hi HDT if you go into the on game manual and into driving options
there is a list of what tyre is recommended for all of the stock cars
such as Mazda rx7 should have S1 tyres to simulate new tyres and N3 to simulate old tyres.
As for the difference in width front to rear tyres im not sure how PD have done this :sick: anyone else got info?

I would like to see a sticky of this screenshot posted here
if anyone can help??
so everyone can look up what tyre they should be running on what car
 
I've seen that list and it sounds 'about right' for each car, but say for example you place an M3 and a Viper on the same S1 rubber, it feels as if both cars have the same grip threshold at the rear, which effectively means that cornering comes down to how much a car weighs rather than a weight/tyre width combination.

If you stuck a Cappuccino on slick R3 rubber, it still wouldn't have the same amount of grip as an F430 with Sports S2 tyres. Simply because the Cappuccino only has 6" wide rear tyres and the Ferrari has 12" wide rears.

The same goes for front tyres too.
 
I think what's happened is that GT5:P only has a very basic tire-wear engine right now. In the hard S-class events that are 7 laps long, the grip levels don't decrease at all. R3 tires, which are essentially qualifying tires, should heat up and wear down quickly, but they don't.

The GT4 tire-wear engine, which had tires independently heat up and lose grip, apparently hasn't been developed for GT5:P yet. I suspect the same is true for tire widths - we only have a basic tire model, and the physics for different tire widths simply has not been developed yet.
 
You could put S-1's on a AWD car and R3's on a MR car, and the AWD would have more grip, so it's not all about the tyre grip, but the type of car.
 
I disagree with that one Fanatic, the current Suzuka 600PP event is testament to that. When they had the unlimited tyre choice for 600PP events, guys were running sub 6'50 times in MR cars. Now that there's the S1 events, I've yet to see a time run under 7'00 in an AWD car.

Where is Scaff when I need his input?!

;)
 
I would imagine it's a pretty simple calculation. For example the 135i uses 215/40/18 tires at the front and 245/35/18 at the rear. So I would imagine PD simply adds what they calculate the contact patch would be for these tires and the tire compound together. Then as the car starts moving and cornering they increase or shrink the size of the contact patch from each tire's grip equation, depending on how loaded or unloaded they are. What they don't seem to take into account is air pressure and side wall stiffness. Well they do, but it's the same for every car.

AWD cars only have more grip than 2WD when they are under acceleration (for obvious reasons). Under braking or cornering at a constant speed they are the same as 2WD cars. AWD cars also have more stability than 2WD cars, which people may confuse as more grip.
 
My issue isn't with AWD versus FR or MR. My issue is with tyre widths. I know they don't model sidewalls and pressure, but do they model tyre widths? In my opinion, it doesn't feel like it at all. The threshold for all cars appears to be the same, regardless of what sort of contact patches these cars would have in real life.

I seriously think that PD have modelled the tyre physics on 9 different tyre contact patches, not one for each car in the game.
 
for me i wish PD just had an original fitment spec tyre for each standard car, no complicated guessing whether one car is is supposed to have N1's or S2's (save that for tuning only) etc to get closest to real life. And that way it would make it more realistic when I race an old 68 Charger with it s original skinny crossply (non steel belted radial) tyres than just hoping N1's or S2's or whatever replicate this.
 
for me i wish PD just had an original fitment spec tyre for each standard car, no complicated guessing whether one car is is supposed to have N1's or S2's (save that for tuning only) etc to get closest to real life. And that way it would make it more realistic when I race an old 68 Charger with it s original skinny crossply (non steel belted radial) tyres than just hoping N1's or S2's or whatever replicate this.

👍👍👍

I think all the tires need a little more grip.
 
My issue isn't with AWD versus FR or MR. My issue is with tyre widths. I know they don't model sidewalls and pressure, but do they model tyre widths? In my opinion, it doesn't feel like it at all. The threshold for all cars appears to be the same, regardless of what sort of contact patches these cars would have in real life.

I seriously think that PD have modelled the tyre physics on 9 different tyre contact patches, not one for each car in the game.

nah no way, tune the blitz to max power and do the same with the viper they both have about the same amout of hp 692 for the blitz and 697 for the viper. then take them for a test drive the blitz will spin for ever and the viper hooks up relitively easy. Now im not talking stock set ups here either ive been working to get the blitz to hook up for a few weeks now. But look at the back tires the blitz, at least width wise looks like normal street tiers 10" wide MABYE the viper on the other hand has massive meats in the back prob a 325 375 something like that by the look of it.
 
Good stuff this is something they can factor in GT5, Can you do it in forza 2 ?

Yes you can mount tyres with different widths in Forza2.
Unfortunately tyre grip in Forza is too high compared to GT5P.
Driving the same cars on the same track in both games you can reach much higher corner speeds and lower lap times in Forza2 with stock tyres.
 
I disagree with that one Fanatic, the current Suzuka 600PP event is testament to that. When they had the unlimited tyre choice for 600PP events, guys were running sub 6'50 times in MR cars. Now that there's the S1 events, I've yet to see a time run under 7'00 in an AWD car.

Where is Scaff when I need his input?!

;)

I should of phrased it as better performance, as apposed to better grip. I have managed to run Suzuka 600pp on S-1 tyres at 6'48 in an EVO X. I was running practice laps though, not an actual online race.
 
If you stuck a Cappuccino on slick R3 rubber, it still wouldn't have the same amount of grip as an F430 with Sports S2 tyres. Simply because the Cappuccino only has 6" wide rear tyres and the Ferrari has 12" wide rears.

The same goes for front tyres too.
not stricktly true, the R compounds offer a notably higher ammount of grip over the S compounds. Also how much grip you have comes down to more than just contact patch and weight. The cars setup has a lot to do with it as well. What you should be cmparing is two cars with the exact same compound. Saying this car with R compound shouldn't have as much grip as that car with S compound is something a: that I personally think is wrong given that the R compounds are competition slicks and the S tyres arn't and b that even if the variables involved mean that should be the case, we don't know the exact properties of these tyres so there is no way for us to know.
 
i'm with AERO on this, it looks like they dont compensate for the width of tyres. i also have yet to do a sub 7min on the 600pp suzuka (s1) i've been very close but not been done yet. could be do-able if pp was set to 599 if you have 3 decent laps.
 
PD's generic N1-R3 tyre types is almost last factor coming from obsolete old GT physics model and should be eliminated, because it brings only confusion into simulation. One car with N2 is more accurate to real life than other car with S1. There are many types of tyre on the market and real cars, many compounds, thread designs, profile heights, sidewall strengths and all this colourful world of tyres should be in GT.
 
Personally I think it's time for PD's tyre system to be completely overhauled.
 
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