Sure, no problem! Hopefully they’ll be worth your while.
RR
do you think this formula could work on an f1 car?
I guess its worth a shot
Car Make & Model: Lotus E21
I would like my pressure in: psi /
Front Tyre-Width/Side-wall Percent-
age/Rim Size: 265/60R13
Rear Tyre-Width/Side-wall Percent-
age/Rim Size: 355/45R13
Vehicle weight (in pounds): 1,422 lbs
Not sure but might work…
Front Tyre Pressure: 23.4 psi
Rear Tyre Pressure: 22.1 psi
Please remember to tweak the car to suit these pressures or they won’t work!
RR
This will be an interesting challenge for you RR.
Car: Camaro ZL1
Weight: 3981lbs (for a series I’m in)
Front Tire size 285/35R20
Rear Tire size 325/35R20
Pressure in PSI please. I’m curious to see how your formula will calculate psi for a heavy car.
Front Tyre Pressure: 28.9 psi
Rear Tyre Pressure: 27.4 psi
Thanks RR! Here’s what happened.
I originally had the car set at 28.0 psi up front, 27.5 in back. The car at that time was grippy, but not consistently. Plus my tire wear was uneven, with the rear wearing a lot more than the front, which you’d expect in a RWD car as heavy as mine. Now, with the new pressures, I’m getting a little more responsiveness (tested it on Laguna Seca, still doesn’t like the Corkscrew or the following corner, with push on exit and in the middle of the corner) as well as a bit more consistent feel in terms of grip. Plus, my tire wear is even (but the right front wore a little more, but not much), and the tire temps -the rear tires taking a bit longer to heat up while the fronts heat up quicker, giving me back end grip longer, and front end response quicker. Granted, I’m running a lot of camber (in the 3’s up front 2’s in back), but the car feels faster. I shaved 4 tenths of a second off my opening lap, from a 1.39.998, to a 1.39.539, and beat my fastest lap in the car, from a 1.35.112 to a 1.34.877. Not an extreme difference, but they matter in an endurance race.
Thanks again!
Yey! I think I might keep this formula… apart from one, all the rest have been a great response! Thanks man, if there is anymore cars, just post the info here.
Thanks again for the feedback, it really helps me understand whether they’re working or not,
RR
could you please do this one for me?
Car Make & Model: BMW E92 M3
I would like my pressure in: psi
Front Tyre-Width/Side-wall Percent-
age/Rim Size: 265/35R18
Rear Tyre-Width/Side-wall Percent-
age/Rim Size: 305/35R18
Vehicle weight (in pounds): 3,536 lbs
Front Tyre Pressure: 29.4 psi
Rear Tyre Pressure: 27.8 psi
I would like psi calcs for the following car, please and thank you.
Meow.
Car: Ferrari GTO (1984)
·Front Tyre-width/Side-wall Percentage/Rim Size: 265/40R16
·Rear Tyre-width/Side-wall Percentage/Rim Size: 335/40R16
·Vehicle weight (in pounds): 2,268 lbs
Front Tyre Pressure: 26.0 psi
Rear Tyre Pressure: 24.1 psi
Thank you! Much grippier around corners. Seems faster, can’t give times because this is my first racing game and I can’t stay on the track consistently. 
Are you using dotNet VB or old VB 6?
Thanks for the help.
Doesn’t matter if your fast or not, if your times are improving or at least your doing the same times but the car feels better then that’s better than nothing isn’t it?
Anyway, I’m using Microsoft Visual Basic 2010 Express. It’s free and isn’t a trail period so yeah…
RR
Can you do the indy cars? I’m laying in bed and cant get the values rite now lol but they’re weights and tires dont change… And wouldnt rim weight matter or not? Im no expert in fact im a dunce but just tryin help if you forgot to factor it.
If you can tell me the weight of the rim go ahead but, where is that information stated? From what I know, the only information that rims give is how much the rims take off the gross weight!
But yes, it is a factor and it’s kind of… incorporated into the gross weight of the vehicle. But it’s a force which should be counted for but as usual, Forza doesn’t provide the means so I have to work around it.
Erm… now the indy cars might work, same as the F1 cars but the tyre pressure formula is only for Circuit racing not Oval!
RR
I put the tire pressures that your gave me onto the f1 car and I can tell the car is much grippier but I can’t put up my fast times so right now I am trying to build a tune to fit the tire pressure. But overall the formula you have works for the f1 car.
I put the tire pressures that your gave me onto the f1 car and I can tell the car is much grippier but I can’t put up my fast times so right now I am trying to build a tune to fit the tire pressure. But overall the formula you have works for the f1 car.
Oh great, thanks for giving it a go and hopefully with the right tune you’ll be beating your PB’s!
RR
Hi RR,
as an avid fan of your tuning formulas I’m eager to try out your new tyre pressure formula.
I actually have two configurations of a Mustang 69:
Weight: 2697
Front Tyre: 225/60R15
Rear Tyre: 225/60R15
Front Tyre Pressure: 27,4 psi
Rear Tyre Pressure: 29,0 psi
Weight: 3509
Front Tyre: 225/60R15
Rear Tyre: 225/60R15
Front Tyre Pressure: 26,6 psi
Rear Tyre Pressure: 29,8 psi
All tyre pressures are calculated according to your old formula.
I would like to have the tyre pressures in psi for both configurations if you don’t mind.
Thanks in advance!