Wednesday, 25 November 2015
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The following guide is about the theory behind setting up the engine and gearbox parameters of a modern Formula 1 car in rFactor 2. Engine Rev Limit Increasing the rev limit increases the engine's horsepower but also results in higher engine temperature and thus lower reliability. Lowering the rev limit reduces the horsepower, creating lower engine temperature and a higher reliability. The longer you're racing (in respect to time and the number of laps), the more the emphasis should be placed on reliability. In the mod's engine.ini file, look for: RevLimitRange=(14000, 100, 11) //Base RPM, RPM increment per step, number of steps This means that the base RPM at which the Rev Limit will engage is 14000. It also means that there are 0 to 10 multipliers of 100 RPM that can be added to the Rev Limit. For example, 14000+(100*5)=14500 RPM. Radiator Size This setting adjusts the air flow to the radiator, which helps cool the engine. The larger the opening, the cooler the engine will run, making it safer to run at a higher RPM. A large radiator opening creates more drag, though, which will reduce top speed. In the mod's engine.ini file, look for: RadiatorCooling=(12.0e-4, 1.0e-4) This shows the cooling rate with velocity. Starts with 12.0e-4 and increments by 1.0e-4 for each setting increment. OptimumOilTemp=107 This value means that the optimum oil temperature is 107 degrees Celsius, keep this in mind when adjusting the radiator size. Boost Mapping Setting up the boost mapping depends on the mod. In general, the boost mapping affects three elements: Engine RPM, fuel consumption, and engine wear. In the mod's engine.ini file, look for: EngineBoostRange=(0, 1, 3) This means that there are 3 levels of boost and each level can be incremented in single steps (i.e. 1, 2, and 3). BoostEffects=(-250,-0.40,-0.05) //RPM increase per setting, % fuel consumption increase per setting, % engine wear increase per setting This means that each increment in engine boost, will produce a negative increment (-250) in RPM, it will reduce fuel consumption by 40%, and will reduce engine wear by 5%. Keep in mind that these values are shown as negatives so their effects are inverted, therefore if the maximum RPM reached by the engine is 15000 and is limited to 15000 with the Rev Limit, we should have the following:
[b]Boost Setting[/b]
[b]Max RPM[/b]
[b]Fuel Consumption[/b]
[b]Engine Wear[/b]
1 15000 Maximum Maximum 2 15000-(250*1 increment)=14750 40% less 5% less 3 15000-(250*2 increments)=14500 80% less 10% less

Note: The second parameter (fuel consumption increase) has yet to be confirmed. BoostTorque=-0.0671 This means that the engine torque will decrease by 6.71% for every boost increment. BoostPower=-0.0678 This means that the engine horsepower will decrease by 6.78% for every boost increment. Engine Brake Map The engine brake map is the amount of throttle that is left on the engine while the accelerator pedal is not pressed. For example, if this setting is set to 10, it means that 10% of throttle will be left once the pedal is not pressed, therefore, the lower the setting, the more the engine will brake.

[b]Setting[/b]
[b]Effect[/b]
Higher number Less engine braking Lower number More engine braking Gearbox Ratios Lengthening the gears will increase potential maximum speed, but decrease the car's acceleration abilities. Shorter gears, on the other hand, decrease maximum speed while creating an increase in acceleration power. Smaller numbers are called "taller gear ratio" while larger numbers are "shorter ratio".
[b]Ratio[/b]
[b]Effect[/b]
Shorter More acceleration. Less maximum speed. Taller More maximum speed. Less acceleration Final Adjusting the final drive will determine the top speed reached. This should be set so that when in the highest gear, in our case, 8th gear, the car reaches max RPM at the end of the longest straight of the circuit. If the max RPM is not being reached at the end of the longest straight, then the final drive is too long and should be shortned. Reverse The use of a low setting is recommended for the reverse gear, it will help when trying to get out of the gravel after a spin.

Janos Magasrevy
SRH Founder and Director

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