My speed limiter shuts down my truck at just over 80 MPH. Why is that so low?
I thought they didn't kick in till 95 or so.
We have turnpikes here in OK that the speed limit is 75 and traffic normally runs about 80 to 85. So from the factory this will not work.
I was just wondering if everyone was in this same boat as me?

 

First off, what do you drive?

 

I'm sorry.

2008 F250 CC SRW 5 pseed auto 3:73 gears

 

weird, usually they run up to 97 mph or something like that, right around 160km/h anyways in my dads F350

 

Mines stops pulling @ about 86 mph, 08 F450 w/488 gears

 

DTC P0297 will be set if the vehicle is operated to a speed that the speed limiter is encountered. 95 Mph for F250/F350 and 81 Mph for F450/F550

This is from online factory service manual.

Bob

 

Check your tires - normally 3/4 ton and up trucks do not come with speed rated tires, so any sustained speeds of 85 or above is a strick no no from a safety standpoint.

This is one reason why the speed limiters seem lower than it would seem practical.

Normally not enforced, unless it is a commercial use truck, trucks over 10k GVW (not combined) are also limited to the same speed as the commecial large trucks, therfore that is why the F450 and up are set at 80 or so top speed as nowhere in the states is it legal to drive faster than 75, and for example here in Washington state, max speed for any truck over 10k GVW is 60, in Oregon, it is 55 mph!!! Yes, 55, and boy do things go by slowwwllly at that speed!

So, given the speed limits, and the unavailability of high speed rated tires for trucks of the 450 and up size, there is a logical reason why these larger F450 are set so low in top speed. Keeps those stupid ones from klilling those innocent ones when they loose a tire!

Things change when you get above that "magical" or maybe not so magical 10k range. And I imagine that it is something that as time goes on wil have to be addressed as these larger trucks are being used more and more in a non commercial use.

David

 

Mine is an F250 & it will kick out at 95, unless I put in a chip. And, of course, the dealer will point out this "over-speed" condition & how he "re-set" it. So you probably won't want to go in for many re-sets ...

 

What size tires do you have? I'm just wondering if you're going faster/slower than your speedometer shows due to larger than stock tires. Seems weird it would shut down at 80ish when everyone is saying it should when you hit 95mph.

 

Thats what I think too!

It has the factory 285 tires on it.

I checked my speedo against my GPS and it seemed very accurate.

 

Thats very weird my 250 with 3.73 gears and 37 tires, tops out at 97 i think, you should take it in.

 

and tell em what... my truck doesnt go fast enough? ive gotten up to 85. plenty fast enough for this boat

 

I was talking to the original poster......................................85 in some parts wont get you past a semi lol.

 

Yeah that's true. I don't know if the dealership will do much! On my truck (too embarassed to say what) it has a wind noise at 80+. They can't touch it because it's faster than any posted speed limit. I bet they will say the same BS to you. Good luck man!

-rockstate

 

Well I found out my mystery as to why my truck would run any faster.

Ford loaded it with the wrong data from the factory. They reloaded the PCM and TCM.
I had taken it in because the CEL came on, and this is what the report said. I'll have to wait till I can see if it will run over 83 now.