Car Not As Fast Anymore

Fast and Furious 6 not about cars anymore?

I gues.......s.....s.sss

My car doesn't reach top speed anymore?

I will give you mechanics 101 class lesson. the parts that limit top speeds are
#1 final gear ratio lower gears give quicker responce but less top end speed
#2 fuel supply, your fuel pump must supply enough fuel presure to reach the desired need of the engine idle requires 1lb 5 grand required 10lbs (example numbers)
#3 air supply the faster the engine revs the more air it needs to continue climbing
#4 cam shaft and valves at a cetain rpm valves float and are not functioning correctly to continue higher rpm
almost always the problem is fuel based in this situation for street driven vehicles. ps
I agree you dont need 115 anyway but the issue could be costing you fuel milage
also the smog system may need replaced and your loosing power through a plugged cat converter.

How Fast are Police Cars?

Both are true. The Police Interceptors are built on a racing frame instead of the commercial passenger car frame. The geometry of the frame / wheels is different also, which contributes to the handling. Which also makes them not very comfortable.

Here's the kicker. Although the police cars can out preform and out maneuver most of the other cars on the road, we seldom chase anymore. Too many innocent people get hurt. The blame used to fall on us and now the courts are passing blame on the bad-guy we're chasing, but regardless - chases injure innocent people and we just don't chase many people anymore because of that. Once we have identified the driver, the car, etc.. We have other ways to catch them later - safer. Chases are for Hollywood now.

Hope this helps.

Why doesn't Engine "RPM" matter in how fast the car goes?

You seem to be very confused. Let's use realistic examples.

Car A has an engine that produces 150 ft-lbs of torque, 150 HP, and redlines at 7500 RPM. It's gear ratios for final gear are .85 & 3.5 (1:0.85 is the gear ratio of the final gear, while 3.5:1 is the differential unit.) The car runs on 17" tires (~1.3 meter circumference)

Car B has an engine that produces 300 ft-lbs of torque, 300 HP, and redlines at 7500 RPM. It has the same gearbox and differential as car A. It has the same tires as well.

So at say... 5000 RPM; lets see how fast car A travels. So 5000/0.85 = 5882 RPM. 5882/3.5 = 1680. The tires are rotating at 1680 RPM. 1680 * 1.3 = 2184 meters per minute. 2184 * 60 (60 mins per hour) = 131,040 meters an hour. Turned into KM/H, that is ~ 131 KM/H. Thats pretty realistic if you ask me.

Now, how does the 300 HP car handle this? 5000/0.85 = 5882 RPM. 5882/3.5 = 1680. The tires are rotating at 1680 RPM. 1680 * 1.3 = 2184 meters per minute. 2184 * 60 (60 mins per hour) = 131,040 meters an hour. Turned into KM/H, that is ~ 131 KM/H.

I quite literally copied and pasted it simply because TORQUE AND HP HAVE NOTHING TO DO WITH SPEED!!! <----

Now, torque can indeed affect top speed in the way that if a car is not very aerodynamic and is limited in speed by it's aerodynamic defincies, then a car with more power can power through the air more than a weaker car. The same is also true for if the cars are going up a hill or incline; the car with more power can utilize it's power to get the upperhand, but otherwise, if it's a flat land and aerodynamics dont come into play, then the cars will be going at the exact same speed.

An extremely good write up on HP, Torque, and RPM, which I think could be very useful to you :
http://www.automotiveforums.com/vbulleti...

Does more horsepower make a faster car?

First of all, horsepower means nothing, nada, zilch. For the torque freaks out there, that doesn't mean anything either.

The only thing that matters is the area under the line you drive on a distance/time or velocity/time graph. The greater the area, the better your car is at accelerating. More velocity or distance earlier is the key. That is why a super bike with 150HP will smoke any muscle car with 400HP.

That's not to say that power won't affect how fast your car is, but it does so in a very non-linear relationship. Adding 15HP to a 300HP engine won't give you consistently noticeable performance increases. In order to half a track time, you'd have to have four times the horsepower you have now.

And it's not just making the power, it is getting it all to the ground. Burnouts are cool, but they don't get you anywhere. You need a certain amount of wheelspin, but too much will actually rob you of performance. You also need to make sure your driveline components can take the added stress.

Removing weight is a very effective and much cheaper way to increase performance. Also, driver skill can make a lot of difference.

These modern cars often take the driver out of the picture because they have launch control (the Challenger does anyways) which means a computer is setting everything up for optimum acceleration.


But don't get sucked in to the drag race thing. Not only is it illegal and dangerous, but it will just prove that there is always somebody faster than you (good luck against the new Nissan GT-R). Just drive for fun and enjoy your vehicle's performance. I have a ton of fun with an old underpowered RWD car going sideways on dirt roads.

What do you consider a "fast car"?

Generally speaking, the 7-second 0-60MPH mark is considered the benchmark among common cars. A car that can do seven is what would be considered about par for new cars.

For instance, a 2015 V6 Accord doing a 0-60 in 6.5 seconds is considered reasonably fast, all things considered. On paper, the number isn't all that impressive, but in any normal off-track driving situation, you'll find that you are well past the speed limit and getting well into unsafe driving speeds in mere moments, while the 4-cyl CVT model does a modest 7.5 seconds, but is still more than adequate for pretty much any driving situation.

If your car can break seven seconds, it can take the majority of cars currently sold (although perhaps not by much).

If you want to talk about cars that are specifically designed to be fast at the expense of convenience, the numbers slant quite a bit. Once you start talking five seconds, you are into V8 Mustang territory, and breaking four seconds becomes supercar territory. I would say that anyone who says a car has to break four seconds to be considered 'fast' has never driven a car that can do that (at least not to its potential) because the word 'fast' does NOT come CLOSE to describing what it feels like to be accelerated at those speeds.

Seven seconds = Faster than your average commuter car.
Six seconds = Quite fast (think the new Mazda MX-5).
Five seconds = Very fast, to the point where you have to actively think about traction or you'll crash.
Four seconds = Insanely fast, you really should attend a professional driving school before driving one of these cars.

Note that being able to afford a fast car doesn't automatically make you qualified to drive one.

My car won't go faster than 60 mph. Why?

I reside in North Carolina and purchased a brand new 06 Acura TSX from a trader in PA in Nov. 06. I drove the vehicle seven-hundred miles again to NC. I drove at distinctive speeds. I extensively utilized the cruise manipulate however now not at all times. and did not more than five-6 miles over the velocity prohibit. The velocity prohibit on one of the highways, in particular in NC, is 70 MPH. My vehicle now has close to sixty four,000 drawback loose miles.