This guide is aimed at people starting to tune, if you’re looking for advance information, I would redirect you to WormBurner Guide :
http://forums.forza.net/turn10_postst221_Tuning-Guide.aspx
This is gonna be basic to help you get into it.
Feel free to ask question.
Before we begin:
If you don’t understand the terms « Understeer » and « Oversteer »;
Those are important term if you look to start tuning.
Before we Begin II :
Which order should you tune :
The car should be tuned as a whole. Each part affect another.Start by the parts you’re sure you understand. Then, save your tune and go for the parts you know less about, this way you can always come back to your original tune.
If you’re really looking for an order, here the order I do it most of the time :
Tire
Gearing
Brake
Differential
Spring
Damping
Anti-roll bar
Aero
Lets begin
Tire :
Optimal grip for tire is achieved around 32-35 psi. Personally I try to get them as close as possible to 32 pi.
Front tire
Higher PSI = More grip on front tire/Less on Rear
Rear
Higher PSI= More Grip on Rear/Less on front
Note : If you do rivals, you should make sure your tire are stable at this PSI,
If you more in « 3 laps races », you should make sure to be at the right psi for as long as possible.
Gearing :
Short answer :
Higher gearing : More accel / Less top speed.
Longer Answer :
Too long and you wont have enough accellaration, too short and you will end up losing time as you will always shifting between gear, and your top speed wont be high enough.
Options 1 :
Go with the sport transmission Then go on the track you’re tuning for, find the fastest part of the track, and adjust the final drive so you’ll come as close a possible to the red line on your last gear.
Options 2 : Find your max HP, and tune your transmission so when you’ll shift, you’ll end up about 750-1250 rpm under your max HP.
Options 3 :Learn more about shifting and powerband;)
Alignement
Camber
I think this image pretty much explain it :
Front and rear :
Positive Camber :
You probably don’t wanna run Positive camber (In Forza).
Negative camber :
You want to run Negative camber, usualy -1,0 or more. Too much and it will be less effective. You need to find the sweet spot.
Toe :
Toe-in= Positive degree Toe-out = Negative Degree
Toe IN improve stability
Toe Out provides turning response
Excessive toe-in makes the car unresponsive and doughy to turn-in,
Excessive toe-out makes the car nervous and lacking in directional stability.
Caster :
Image:
Caster starts at 5,0 degree. To make it simple, more caster = more camber during turn. Too much caster and you’ll loose stability.
Anti-roll bars :
Stiffer front : Decrease oversteer
Stiffer Rear : Decrease understeer
Springs :
Reduce oversteer by stiffening the front springs or softening the rear.
Reduce understeer by softening the front springs or stiffening the rear
Ride Height :
To quote Wormburner :
«Keep this as low as possible without the car bottoming out »
Damping
Reduce understeer by softening the front dampers or stiffening the rear.
Reduce oversteer by stiffening the fronts and softening the rear
Usualy run bump at around 70 % of rebound.
Aero :
Add Front downforce :
More front stability/Braking
Less Accel//Top speed
Add Rear downforce :
More Rear stability/Braking
Less Accel//Top speed
Braking
Brake balance :
You need to balance so the front and rear wheels lock about the same time. More on the front and you wont have optimal braking, more on the rear and it will feel very unstable, and probably cause oversteer at the corner entrance,
Brake Pressure :
This wont make the car brake more, it will only make tge trigger more sensible.
Differential :
During a turn, a car inside and outside wheels doesnt turn at the same speed. It’s the differential that make the magic happen. During straight line, the wheels are gonna be locked together. The Decel setting is gonna set when the wheels unlock, and the Accel setting is gonna set when they lock back together. For a rear wheel drive car:
Accel :
A too high % here, and it will cause corner exit oversteer. Too low and the driving wheels accelleration wont be optimized (Sometime will cause one of the driving wheel to lose grip)
Decel :
A too low % here, and the car will have oversteer on corner entrance. Too high and the driving wheels braking wont be optimized (Sometime will cause one of the driving wheel to lose grip)
Distribution Front/rear (AWD only):
More at the front, and the car will act more like a FWD car, more at the back and it will act more like a RWD.
