How do you change a cars electronic speed limiter?

Question

I have a 2006 chrysler 300C that has an electronic speed limiter, how can I change the speed limit that it will stop at? What programmer/chip would I need to get? Thanks =)

Answer 1

Just to add onto what Mad Jack said, there is also a reason that Chrysler didn't put higher rated tires on the 300. The brakes and suspension are not designed for speeds over the limiter. When you start going 130-160 MPH, you are asking a LOT from your brakes, and other components in the car. I have a 2004 4 cylinder Audi. My car will do a GPS confirmed 161 MPH at redline in 5th gear. The speed limiter on my car was set at 128 MPH from the factory, but my factory tires were rated for 168 MPH. I later realized this is because my brakes were not designed to repeatedly stop the car from these sort of speeds. I later upgraded the brakes, and removed the limiter. Be careful.

Answer 2

Just about any aftermarket programmer will alter the top speed limiter. Get with the times. They haven't used a chip to alter the programming in an automotive computer since the OBD2 computer came out in 1996.



You realize this top speed limiter is in place for a reason. The manufacturers will set the top speed limiter to just below the speed rating of the factory installed tires for liability reasons. They do not want to get sued because some idiot exceeded the capabilities of the tires installed on the car. Are you an idiot?



So before even thinking about messing with the top speed limiter, you need to replace the tires with a speed rating that is above your targeted top speed. It would really really suck to be going 120 MPH on your 110 MPH rated tires and have a blowout because you exceeded the limitations of your tires.



Maybe this is something you should not even be messing with. The fact that you were looking for a chip to alter the programming in this car and that you do not understand why the limiter is in place tells me that you are pretty clueless about this process.

Answer 3

Well, for one, it's a Chrysler 300, not a sports car, so the speed limiter is already set higher than the car will ever need to go. For two, without serious modifications, you won't exceed the stock limiter on any race track either.