Springs and Shocks or Coilovers
For decades, dumping ride heights by means of lowering springs or some sort of adjustable coilovers has been the starting point for almost every build.A coilover is an automobile suspension device. "Coilover" is short for "coil spring over shock". It consists of a shock absorber with a coil spring encircling it. The shock absorber and spring are assembled as a unit prior to installation, and are replaced as a unit when the shock absorber has leaked. This provides damping without torsional loads. Some coilovers allow adjustment of ride height and preload, using a simple threaded spring perch similar to a nut. More advanced adjustable coilover systems use a threaded shock body, along with an adjustable lower mount for ride height adjustment, while an adjustment knob is used to adjust damping.A shock absorber (in reality, a shock "damper") is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. A shock absorber is a type of dashpot.
Wheels and Tires
Few performance upgrades are as beneficial and as obvious as the right wheels and tires. Yet too often heavy, weak, low-quality wheels cast by children in third-world countries stuffed inside of tires you've never heard of are used. A standard automotive steel wheel rim is made from a rectangular sheet metal. The metal plate is bent to produce a cylindrical sleeve with the two free edges of the sleeve welded together. At least one cylindrical flow spinning operation is carried out to obtain a given thickness profile of the sleeve—in particular comprising in the zone intended to constitute the outer seat an angle of inclination relative to the axial direction. The sleeve is then shaped to obtain the rims on each side with a radially inner cylindrical wall in the zone of the outer seat and with a radially outer frustoconical wall inclined at an angle corresponding to the standard inclination of the rim seats. The rim is then calibrated.
Intake
The path air takes to get into and out of your engine will never change directions, the factory airbox and intake tubing poses the most significant and obvious restriction.Production cars have specific-length air intakes to cause the air to vibrate and buffett at a specific frequency to assist air flow into the combustion chamber.Aftermarket companies for cars have introduced larger throttle bodies and air filters to decrease restriction of flow at the cost of changing the harmonics of the air intake for a small net increase in power or torque.
Exhaust
An exhaust system is usually piping used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of:Cylinder head and exhaust manifold,a turbocharger to increase engine power,a catalytic converter to reduce air pollution,a muffler to reduce noise.
Header
It's true that your engine's header(s) are stuffed in between its intake piping and its exhaust and all of a sudden, we are not following that same path but there's a reason for that.
Clutch and Flywheel
The right clutch will allow you to better transfer all of that torque to your tires and a lighter flywheel can make all of that happen just a little bit faster.
ECU and Electronics
You won't be able to show off whatever tunable ECU or piggyback box you have just wired into place at your next donut shop meet but like the right wheels and tires, it will be one of the most important mods you'll ever make. That intake, header and exhaust you just bolted up.An Engine Control Unit (ECU) is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance.
Cams and Valvetrain
Bigger cams and more durable valvetrain bits will do you little good without first opening up the intake and exhaust paths and having some sort of tunable ECU to make it all work together, though.A valve train or valvetrain is a device that controls the operation of the valves,[1] in which a sequence of components transmits motion throughout the assembly. A traditional reciprocating internal combustion engine uses valves to control air and fuel flow into and out of the cylinders, facilitating combustion.
Fuel System
A higher flowing fuel system made up of a bigger pump and injectors has got to happen should you ever want to crank the boost up.A fuel pump is a frequently (but not always) essential component on a car or other internal combustion engined device. Many engines (older motorcycle engines in particular) do not require any fuel pump at all, requiring only gravity to feed fuel from the fuel tank through a line or hose to the engine. But in non-gravity feed designs, fuel has to be pumped from the fuel tank to the engine and delivered under low pressure to the carburetor or under high pressure to the fuel injection system.
Big-Brake Kit
Larger rotors and calipers with more pistons than what the factory already set you up with won't make a whole lot of difference if the ability to make a whole lot more power and you needing to slam on the brakes in a hurry and without overheating them is not there.
Anti-Roll Bars
Typically, antiroll bars are there to balance out an already put together suspension. Hold off on these until springs, shocks and ride height have all been configured.An anti roll bar is a part of many automobile suspensions that helps reduce the body roll of a vehicle during fast cornering or over road irregularities. It connects opposite (left/right) wheels together through short lever arms linked by a torsion spring. A sway bar increases the suspension's roll stiffness—its resistance to roll in turns, independent of its spring rate in the vertical direction.
Aerodynamics
Your street car does not need any sort of aerodynamic help beyond what the factory already did for you. You will never be going fast enough to take advantage of any of it which makes it the obvious upgrade to save for dead last.
