can you remove the speed limiting device on new cars without it affecting anything?

Answer 1

It isn't a "device" per se.
It is programming in the Engine Management System (e.g. "The computer").

The only ways to stop it from working is to change the programming or replace the module with another one.

Changing the programming requires a specialized system that can re-flash the chip in the EMS that removes that limit. I know some engineers who helped develop the EMS for Ford and they kept the programmers for "future testing". But unless you live near Dearborn, MI, you don't have much chance of going this route. Police cars are programmed to not have this restriction. The computers in their cars are setup without this limit. When they are re-sold, this is generally re-flashed to re-instate the limit.

Replacing (or supplanting) the EMS requires buying an aftermarket computer that plugs in where the current one goes. You would install new software through a laptop. This is an expensive solution (a couple thousand dollars) and is usually only used on race cars with after-market fuel and ignition systems.

Unfortunately, there is generic device no you can plug in and re-program the EMS. There are some chips available for some performance cars that claim to advance the timing and remove the speed limit - and even increase the rev limit - but again, they are very specific in the models they target.

I agree that the limit was put there because of lawyers and laws. Police don't want high-speed pursuits and lawyers have held auto-makers responsible for people driving too fast. So the government mandates speed limiters.

I disagree that the answer to your query that limit is caused by a rev limiter. The speed is being limited, not the revs. There is a rev limiter in the EMS, but that doesn't limit the speed. The speed limiter caps engine performance long before a car in 6th gear would hit its rev limiter.

(Technical info: it works by choosing a cylinder and not sending a spark to it. Then the next cycle it fires that cylinder and chooses another one to skip. This prevents fuel from building up within a cylinder if it is chosen multiple times in a row. On some high-powered cars, multiple cylinders (as many as 4) will be shut off in a single cycle.)

(Interesting aside: If you want to see how far off calibration your speedometer is, reach the maximum speed of the EMS rev limiter. It will be a round number like 80, 100, or 120. If your speedo doesn't stop there (perhaps it stops at 99), then your speedo is off by that amount. In this case, 1 mph. Most car's speedo's are off (over) by 2mph. Police car speedo's are calibrated, certified, and sealed.)

Answer 2

Absolutely not. Have you actually seen what happens on motorways with trucks which are currently limited on their top speed? They bunch up, travel way to close to each other and take an age to overtake if one of them can manage another 1mph. If you limit all cars to a max 70mph then exactly the same will happen with cars on motorways and dual carriageways. Thus causing more accidents through drivers "switching off". Very very bad idea.

Answer 3

You need to get the after market programmers on domestic cars and special chips or add on computers for most imports.
The speed limiter is to keep the lawyers at bay. The upper speed is limited to the speed rating of the tires installed at the time of delivery for liability and safety reasons. On the car, it will not hurt it to remove it, but make sure you have tires for the higher speeds. They can blow up.

Answer 4

I own a shop, and do a lot of this kind of work. First off its not a speed limiting device, it is a rev-limiter that keeps the engine rpm's from going up too high beyond the manufactures recommended red-line. If you will go to this site
www.fuelairspark.com and check out a device called "Fast Flash" you will see what you need to purchase, and how to do it. There are other companies out there that deal with this issue, but through my experience I have found this one to be the best for what you wish to do.
Glad to help out, Good Luck!!!

Answer 5

on some vehicles you can "chip" them but for say on like an intrepid with a 3.5 they are goverened to 118 mph but if you are in good with the dodge dealership you can have the PCM reprogramed to "police package" wich will allow it to run somewhere around 135 to 140 mph.....if you do something like that then you really need to consider upgrading the speed rating on the tires

Answer 6

all you need is a scan tool thats capible of re programing the computer just program the car to how fast you want to go like program it at 80 mph so youre kids cant speed or program it to 150 so you can get killed you can alyays reprogram it back when you sell the car to pay youre speeding tickets

Answer 7

You can usually get a "race" chip.

It doesn't affect anything if you don't over-rev the engine, or if you don't speed.

Answer 8

There are no speed limiting devices on new cars!!

Answer 9

Yes you can remove it. It's called a governor. Your car will no longer cut out at high speeds.

Answer 10

you have to buy a new chip