How to simulate vehicle acceleration ?

Hello! I have a problem trying to simulate vehicle acceleration, I tried doing for i loops

Seat.Changed:Connect(function()
	for currentspeed, 100 do
		wait(1)
		Speed = Speed + 1
	end
end)

or using repeat loop

Seat.Changed:Connect(function(pro)
	local input = Seat.Throttle
	repeat 
		wait(.5) 
		Speed = Speed + 1
	until seat.Throttle ~= input
end)

Hope you can help! (And thanks for reading :D )

There's a lot of ways you can do this. Easiest way is to simulate a throttle and turn that into RPM. Then you can grab a gear ratio to simulate transmission and turn that into speed. Here's a little script I wrote.

local Throttle = 0
local RPM = 0
local MaxRPM = 5000

local Speed = 0

local GearRatio = 1/4 --4:1, for every rotation of the wheel, four rotations of the engine were accomplished. don't worry about that too much as we aren't simulating it.

for i = 0,1,0.02 do --increase throttle, and calculate speed.
	Throttle = i
	
	RPM = MaxRPM*Throttle
	Speed = RPM*GearRatio

	print(Speed)
end

You can simulate fully the real interactions that occur between the throttle (and throttle valve) and the engine, alongside an actual transmission and clutch, and properly turn this all into a rotation velocity, but that's a huge amount of physics (and calculus) and not necessary, I assume.