Have you ever wondered how work out your Tyre pressures?

Well hopefully with my simple formula I have designed, you'll be able to get the perfect tyre pressure for your car!

I have been creating formulas like this since FM2 and this is my first one for tyre pressures.

With only recently creating this formula for tyre pressure, I have already found an improvement within my cars ability and mine which I hope use will find to.

Tyre pressure equation (Psi) = (WD %( LBS)) * (9.8 / (USR – LSR)) + 14.7

abbreviation meanings:

WD = Weight Distribution

LBS = Weight of car in pounds (Only pounds!)

USR = Upper-Spring-Rate (Maximum stiffness the spring(s) can go)

LSR = Lower-Spring-Rate (Minimum stiffness the spring(s) can go)

9.8 and 14.7 are constants which must

**NOT**be changed!

***Note***

When finding Front-Tyre Pressure use Rear Weight-Distribution

When finding Rear-Tyre Pressure use Front Weight-Distribution

When finding Front-Tyre Pressure use Rear Weight-Distribution

When finding Rear-Tyre Pressure use Front Weight-Distribution

Example:

In this example I will use a 2013 Lotus E21 (F1 car) just because it's light.

Weight Distribution: Front - 46% / Rear - 54%

Weight: 1422 lbs

Upper-Spring-Rate: 589.3 lb/in

Lower-Spring-Rate: 73.7 lb/in

Once you have got your values substitute them into the formula...

Front Pressure (Psi) = (54 %( 1422)) * (9.8 / (589.3 - 73.7)) + 14.7 = 29.3 Psi (3 significant figures) or (±0.5)

Rear Pressure (Psi) = (46 %( 1422)) * (9.8 / (589.3 - 73.7)) + 14.7 = 27.1 Psi (3 significant figures) or (±0.5)

If you want to get the perfect tyre pressure within "0.1 Psi" please follow these steps:

I will use the example F1 car setting(s) as a reference!

1. Once you have gotten your Psi set them to the nearest ±0.5 - E.g. 29.3 Put to 29.5 (Closer to 29.5 than 29.0)

2. Remember the difference between the calculated and the rounded value - E.g. 29.3 - 29.5 = -0.2

3. Once you have found the difference, at the main menu go to: FORZA PROFILE > HUD > UNITS and change to "METRIC"

4. Now in Metric go back to your car to tuning setup and adjust the tyre pressure(s) - E.g. Difference = -0.2 so tap left

**D-Pad**twice to go down.

5. Once tyre pressures have been adjusted restore you original HUD - Unit setting and your tyre pressure(s) in Psi should be within 0.1, 0.2, 0.3, 0.4 etc.

Taking Mathematics to the game!

"The true sign of intelligence is not knowledge but imagination" - Albert Einstein

For my open source tunes please click 'here'

Hope this helps!

Enjoy,

RR

Enjoy,

RR

*Edited by user Saturday, June 21, 2014 2:07:37 PM(UTC)
| Reason: Not specified*