alright i fig. i would ask. did a search could not find. how fast will an 09 quadcab 4x4 sport with hemi go?

i tested it in my ex- caliber srt4 ...

but dont plan on it in the ram, just curious.

 

Slightly off topic.. How did you like your srt-4 caliber?

 

Thought I read the computer shuts down the engine at 105mph.

 

The computer will cut fuel to ensure that you don't exceed the speed rating of the tires (plus a factor of safety). 105~110 mph sounds about right. I remember the TJ Rubicons had a lower speed threshold than standard TJ's because of the speed rating of the MTR tires.

Unless someone knows how to edit the safety feature controlled by the computer, and puts on a set of performance tires at the track, we won't know the true top speed of these babies.

 

this is the worst part of the 09 truck, on my o5 i used to drive the back roads from laredo texas to BFE and i would AVERAGE about 125mph. i used to do that about once ever couple of months. The air would ge under the turck above 130 and you didnt feel like you had good control. so i kept it to about 125. I dont know why ppl in the other thread where complaining about people driveing that fast. I have a small airplaine and on a slight down wind landing you flare to land at wll be over 100mhp and then your driving on only 3 8" tires and steering with nothing but your feet. Speed is a function of your brains ability to think far ahead of the airplaine (or in this case the turck) granted some people cant think ahead at the checkout line in the store to know they are going to need money in a few mins. but in my opinion they shouldnt be driviing or flying.
jmo
Lee

btw Disable that damn speed limiter.

 

I was very disappointed to find out that the rev limiter kicked in a 107! I hit 107 on the on ramp to the freeway!! 09 4X4 Laramie w/hemi.

 

Like I said, the speed limiter is there because of the speed rating of the tires. I saw a video presentation by some guys from BFGoodrich on what happens to a tire when it exceeds its speed rating. Needless to say it ain't pretty... The video was of a tire on a dyno spinning up to and beyond its speed rating. Because the tire is spinning so fast, the human eye can't distinguish the shape of the tire. They use a strobe light that is synchronized to flash once per tire revolution so that you can visually distinguish what the tire would look like statically. Beyond their speed rating the tires don't stay perfectly round anylonger and begin to distort and become oblong. On a dyno, it was cool to see, but add a moving vehicle to the equation and bad things can happen.

Although small, your airplane tires are designed for high performance. High performance tires are specially designed to maintain their function at higher speeds. This comes at a higher cost though. Since your average family sedan or pickup so rarely sees speeds in excess of 100 mph, the auto makers use tires designed for just that. For reasons including safety of the consumer and litigation protection for themselves, they added fuel cut off programing in the computer to ensure that the vehicle cannont exceed the speed rating of the standard equipment tire.

Pretty much all the standard family vehicles come this way these days. Vehicles that are specifically intended for high performance (like all SRT vehicles) do come with high performance tires and no fuel cut off limitations. Since there is no Ram SRT currently, all Rams will come with this fuel cut off embedded in the computer. Then again, R/T's might be an exception... I hope this helps.

 

Mine hits a wall at 105mph.

 

Mine hits the wall at 105 mph as well.

Most vehicles these days are limited by the tires speed rating. I know that a Challenger R/T has a computer controlled limit of 147 mph because that is the speed rating of the tires on that model. The Challenger SRT-8 has better tires that have a speed rating of 186 mph, so it has no computer controlled limit, and it tops out at 168 mph. Even bullet bikes have computer controlled speed limiters. My Yamaha FZ-1 is computer limited to 165 mph, due to its tire limitations. A Yamaha R-1 comes with better tires, but is still computer limited to 186 mph due to tire limitations.

 

Mine quits at 100, not even 105. I double checked it with my gps which logged 101.