Updated: Feb 25, 2020
by Drew Thirlaway
Sleeper cars are a super interesting subject. A sleeper or Q-car is a car that is a high performance vehicle, but has an unassuming exterior. A lot of people who know what sleeper cars often just look at the outside and think “gross”, when actually you shouldn’t judge a book by its cover, or in this case a car. One thing about sleeper cars are that you can't always tell that it's a sleeper or not because they can just be a generic looking car but there could be a masterpeice under the hood for all you now.
Lots of people just think that sleepers are just some Honda with a crazy engine, when actually almost every vehicle (as long as it isn’t a super-car or a high-performance vehicle already) can be converted into a sleeper. One of the funniest but most amazing sleepers I have seen is a Mini Cooper that beat a McLaren 720s (which is the fastest super car) out of the show room. The ways you can improve a car is you can add a turbo. It uses the exhaust gas to drive a turbine. This spins an air compressor that pushes extra air (and oxygen) into the cylinders, allowing them to burn more fuel each second. You can also upgrade the engine to one that has a higher horse power and more cylinders. The highest amount of cylinders you can have so far is a v20 (20 cylinders) which you mainly get in Bugatti’s. Some of the most common engine you can get is v8 in a lot of cars nowadays.
Some older cars are v6 down to v4. So usually you have people taking a basic car (let’s just say a Volkswagen Polo) and give it a ridiculous engine like a v8-v12, or if you want a crazy car give it a v16 if you can get your hands on one. Sometimes people use nitro fuel which gives a massive increase to speed. When you heat nitrous oxide to about 570 degrees F (~300 C), it splits into oxygen and nitrogen. So the injection of nitrous oxide into an engine means that more oxygen is available during combustion. Because you have more oxygen, you can also inject more fuel, allowing the same engine to produce more power.
Sleeper cars...always more to them than meets the eye!