How to make the car more powerful?

Hello I have a car which goes well on straight fields but when I drive it on a mountain it doesn’t go what do I do?

here’s the script also and I didn’t make it btw

– get the specifications
local speed = script.speed.Value
local accleration = script.acceleration.Value
local steeringspeed = script.steeringSpeed.Value
local steeringangle = script.steeringAngle.Value

– set up the shortcuts
local vehicle = script.Parent.Parent
local seat = script.Parent

– find the tires
local A = vehicle.A – front left
local AA = vehicle.AA – front right
local B = vehicle.B – back left
local BB = vehicle.BB – back right

– find the steering mechanism
local steerA = vehicle.SteeringA.Servo
local steerB = vehicle.SteeringB.Servo

– set up wheels’ motor accerlation
A.Motor.MotorMaxTorque = accleration
AA.Motor.MotorMaxTorque = accleration
B.Motor.MotorMaxTorque = accleration
BB.Motor.MotorMaxTorque = accleration

while true do

-- power the wheels
velocity = seat.Throttle * speed -- use the seat's throttle to determine the wheels' action (backward? forward? nothing?)
A.Motor.AngularVelocity 	= velocity
AA.Motor.AngularVelocity 	= velocity
B.Motor.AngularVelocity 	= -velocity
BB.Motor.AngularVelocity	= -velocity

wait()

-- steering
steering = seat.Throttle * speed
steerA.AngularSpeed = steeringspeed
steerA.ServoMaxTorque = 100000000
steerA.TargetAngle = steeringangle*seat.Steer
steerB.AngularSpeed = steeringspeed
steerB.ServoMaxTorque = 100000000
steerB.TargetAngle = steeringangle*seat.Steer

end

I think that changing the speed and acceleration values higher will move the car faster and make it more powerful. Did you try that?

Yes I tried changing acceleration and max speed but it makes the car go very fast.