Why is it that when I put spoilers in my car it improves braking but it also increases the braking distance?
I am aware of the purpose of spoilers. This problem keeps bothering me. When I put spoilers in my car, it actually feels like dragging a truck.
Does anyone have an explanation for this?
Hey dude, when you add spoilers, and wings you are increasing the weight of your car a little bit, so increasing your breaking distance, this is where your tuning comes in, try adjusting things like the downforce of your wings and your brake bias, with some of the other extras like your new bumpers and skirts etc, most of these are made to increase straight line speed by pushing the air more under or around your car, so this will in turn increase your braking distance. Hope this answers your question. 
First, I want to say that wings and spoilers are not the same thing. What you usually see are wings, not spoilers. Spoilers are more basic and more primitive, and often do little to nothing (depending on what sort of spoiler on what sort of vehicle.) An F1 car, especially prior to all the regulation restrictions dramatically reducing their downforce, can produce many thousands of pounds of downforce, which you could never hope to achieve with spoilers, and if you could somehow get that sort of downforce with a spoiler the size of a barn door it would have so much atrocious drag that you would shoot whoever put it onto your car.
Regarding “dragging a truck,” what you’re likely talking about is the down-side to wings - drag. The F1 cars I previously referenced don’t get all that wonderful downforce for free. All that downforce comes at the expense of straight-line speed. This is why they don’t always run as much downforce as possible, because it’s ideal to find a sweet spot where the lap time gains from the downforce outweigh the time lost from reduced top-end speed. On circuits like Monza, they spend so much time at full throttle that it’s more important to focus on top speed and less on cornering performance, so they run lower downforce there. Their wings produce so much aerodynamic drag that simply letting off the throttle slows the car like you stomped on the brakes on a typical road car. Now, F1 cars are the extreme, with other race cars having lower downforce and production cars having far less still even with aftermarket wings, but this is meant to illustrate what is going on. Wings add downforce which improve performance in areas like cornering but at the cost of slower top-end speed due to the aerodynamic drag.