Announcing ric-o-mputer&dyn-a-mate
Posted by ricomaster
No need to make apologies, great opening post. 
My Grand Prix 4 Files
I'm a total dick. How many people can say that?
Thanks you ricomaster, very nice!
------------------------------------------------------------------------------------------------
PLEASE VISIT: Grand Prix Mods Blog
PLEASE VISIT: Grand Prix Mods Blog
Excellent question, thanks for asking
That brings me to the point when I tried my hand at editing GP4 physics: I could not, because it all seemed so confusing and disconnected. Inside GP4, values influence each other and I could not figure them out.
Note:
I am not in any way implying anything wrong about any community member's work - I find it all fantastic for opening so many possibilities.
I find specially amazing PRBlanco's offsets, Lo2k tools, Carl_gp's Memory Access and Oggo's Blender plugin.
(Meanwhile, I could not find answers to my questions, so instead of giving up my little mod, I tried solving my problem.
Then I thought it would be selfish to develop this tool and not share it, so voila'
Ok going on
I'll comment on values that I had to decide when defining my physics model:
Top Speed
In my understanding, an arbitrary top speed (although probably correct) might end up in contradiction with other user chosen values for engine power, air density, drag coefficient and frontal area, because they all influence top speed.
Top speed should be the result of those values, not the other way around - again, that's my view on the subject.
Different numbers in a multiplication can give the same results, so do unrealistic values.
Lateral acceleration:
Now, how I am supposed to have correct F187 lateral cornering acelerations? ( or let's say 126C2 Ferrari for 1982)? Too many conflicting values and ranges from google.
Downforce:
The proper name in Physics would be lift force (FL) ( when negative, it expresses a downwards lift, hence "down force"
So:
Lift force:
A very simplistic general formula should be FL=m(ay−g); but then for this formula, all grip comes from normal load, and tyre friction is not a limiting factor to lateral force - which is wrong, because they are. In other words, for simple formulas like this, the car would never slip.
Anyway, let's use this formula
If we want to to have -21,574.63N for lift force (FL), the formula FL=m(ay-g) becomes ay=(FL/m)+g; ay=(21547.63/605)+9.80665=45.467195m/s², that divided by 9.80665 results in ay=4.636g.
Therefore, as demonstrated above, we have ~4.6g as value for a 2001 F1's lateral force acceleration which would result in (-2200kgf) of lift force in simple formulas.
Lift force (downforce if you will) is a function of lift coefficient (how efficient the wing is), speed, air density, frontal area, and varies with speed.
It generates downward pressure on the axles according to downforce distribution, influencing the each tyre's grip, which defines the lateral acceleration capabilities during cornering.
Also, the tyre's friction coefficients change with temperature and load - the higher the load (weight, downforce, load transfer), the lower the friction coefficient goes.
Ric-o-mputer® have all those parameters included in the computations.
Carrying on
Braking torque and peak deceleration
When modeling the F187 Ferrari from 1987, given an aero setup, mass, tyres, speed, what would it really be capable of (braking)? I was not happy with google's 3-4g, or 4-5g etc.
Braking torque is a function of the maximum grip force the tyres are capable of generating, under dynamic speed, downforce, load transfer, friction coefficients and the tyre contact area!
The max deceleration is influenced by: speed / downforce / brake balance / tyre coefficients / contact patch area / drag force / axle loads / weight transfer.
So, as for GP4's default values, I believe Geoff Crammond and his team did their homework and I am not to question any of that - I assume they had contact with manufacturers and F1 teams so they knew very well what they were doing.
What I do question, when I am trying to change the default values, is if I am being scientific enough (like they were) and if the values I have are really plausible - the way I found is to calculate them through Physics.
All those parameters above are used in ric-o-mputer® calculations.
Have you tried it?
Do take a look at all the helper comments, instructions, editable values.
I'd appreciate feedback on its ease of use (or lack of it)
Ric-o
PS dyn-a-mate® too isn't "another torque editor" haha - it does not edit, it generates maps from references or user input
Edited 9 time(s). Last edit at 09/29/2025 06:39PM by ricomaster.
That brings me to the point when I tried my hand at editing GP4 physics: I could not, because it all seemed so confusing and disconnected. Inside GP4, values influence each other and I could not figure them out.
Note:
I am not in any way implying anything wrong about any community member's work - I find it all fantastic for opening so many possibilities.
I find specially amazing PRBlanco's offsets, Lo2k tools, Carl_gp's Memory Access and Oggo's Blender plugin.
(Meanwhile, I could not find answers to my questions, so instead of giving up my little mod, I tried solving my problem.
Then I thought it would be selfish to develop this tool and not share it, so voila'
Ok going on
I'll comment on values that I had to decide when defining my physics model:
Top Speed
In my understanding, an arbitrary top speed (although probably correct) might end up in contradiction with other user chosen values for engine power, air density, drag coefficient and frontal area, because they all influence top speed.
Top speed should be the result of those values, not the other way around - again, that's my view on the subject.
Different numbers in a multiplication can give the same results, so do unrealistic values.
Lateral acceleration:
Now, how I am supposed to have correct F187 lateral cornering acelerations? ( or let's say 126C2 Ferrari for 1982)? Too many conflicting values and ranges from google.
Downforce:
The proper name in Physics would be lift force (FL) ( when negative, it expresses a downwards lift, hence "down force"
So:
Lift force:
A very simplistic general formula should be FL=m(ay−g); but then for this formula, all grip comes from normal load, and tyre friction is not a limiting factor to lateral force - which is wrong, because they are. In other words, for simple formulas like this, the car would never slip.
Anyway, let's use this formula
If we want to to have -21,574.63N for lift force (FL), the formula FL=m(ay-g) becomes ay=(FL/m)+g; ay=(21547.63/605)+9.80665=45.467195m/s², that divided by 9.80665 results in ay=4.636g.
Therefore, as demonstrated above, we have ~4.6g as value for a 2001 F1's lateral force acceleration which would result in (-2200kgf) of lift force in simple formulas.
Lift force (downforce if you will) is a function of lift coefficient (how efficient the wing is), speed, air density, frontal area, and varies with speed.
It generates downward pressure on the axles according to downforce distribution, influencing the each tyre's grip, which defines the lateral acceleration capabilities during cornering.
Also, the tyre's friction coefficients change with temperature and load - the higher the load (weight, downforce, load transfer), the lower the friction coefficient goes.
Ric-o-mputer® have all those parameters included in the computations.
Carrying on
Braking torque and peak deceleration
When modeling the F187 Ferrari from 1987, given an aero setup, mass, tyres, speed, what would it really be capable of (braking)? I was not happy with google's 3-4g, or 4-5g etc.
Braking torque is a function of the maximum grip force the tyres are capable of generating, under dynamic speed, downforce, load transfer, friction coefficients and the tyre contact area!
The max deceleration is influenced by: speed / downforce / brake balance / tyre coefficients / contact patch area / drag force / axle loads / weight transfer.
So, as for GP4's default values, I believe Geoff Crammond and his team did their homework and I am not to question any of that - I assume they had contact with manufacturers and F1 teams so they knew very well what they were doing.
What I do question, when I am trying to change the default values, is if I am being scientific enough (like they were) and if the values I have are really plausible - the way I found is to calculate them through Physics.
All those parameters above are used in ric-o-mputer® calculations.
Have you tried it?
Do take a look at all the helper comments, instructions, editable values.
I'd appreciate feedback on its ease of use (or lack of it)
Ric-o
PS dyn-a-mate® too isn't "another torque editor" haha - it does not edit, it generates maps from references or user input
Edited 9 time(s). Last edit at 09/29/2025 06:39PM by ricomaster.
Wow, I need some time to detox my brain from scrolling thru the YouTube reels and such to get all this maths and science... So for now I'm a bit speechless. Should try this one out when I'll get back to GP4 one day (I'm too much busy irl rite nao to play it)
Previous acc (Soutsen) has been banned from use cos of some annoying spammer used the same @mail domain.
↑↑↑ Link to my YouTube channel with some of my STUPID music.
Previous acc (Soutsen) has been banned from use cos of some annoying spammer used the same @mail domain.
↑↑↑ Link to my YouTube channel with some of my STUPID music.
version 33 uploaded
announcing magicIndex ®
correlator of surface index to magic data's track grip
matching physic's values and track conditions to GP4 physics and MagicData
try finding the Easter Eggs (2)
announcing magicIndex ®
correlator of surface index to magic data's track grip
matching physic's values and track conditions to GP4 physics and MagicData
try finding the Easter Eggs (2)
Sorry, only registered users may post in this forum.