I can make a case for a high speed limiter. You are behind some traffic following behind a truck going up a hill where passing opportunities are brief. That traffic is content to just follow the truck slowly up the hill. You would like to get around them since these are rolling hills and this is going to happen a lot. The faster you can get around that traffic, the faster you get back into your lane and out of the opposing traffic lane. Maybe you don't need to go 110MPH continuously, but maybe a five second burst will do it.

 

Seems that everyone is forgetting the main concern of overspeeding these trucks...tire capabilities! My Nitto Ridge Grapplers are only rated up to 100mph. I'm not willing to test that limit in an 7000+ truck!

 

I am a bit of a lead foot but the 96 mph limiter in the my F250 seems appropriate. But I can see wanting to go a little quicker when you're in the middle of nowhere and just looking to get from point A to B, or dyno runs or racing. I am surprised how easily and smoothly these trucks cruise along at their max speeds. They do drink a bit more fuel though. I think you would be less likely to be pulled over than if you were driving a sports car or anything that would be more appropriate at higher speeds. Speed rating of tires and maybe drive line components are risk too, Not to many tires with appropriate load ratings have speeds ratings that are more than 106 or 112 mph.

 

It was worth it for me, just to be able to make those passes when needed. But as was noted it will be tracked in the ECU, not sure how that worked though. I don't know if the dealer has to go looking for it but it was never brought up when I had my vehicle at the dealer.

 

Rural Nevada also has some 80 MPH speed limits. There have been numerous times I was running 85 on I-80 and been pasesd by a loaded semi like I was crusing a school zone.
If a Peterbilt can run close to 100 with 80,000 pounds, a empty Super Duty should be OK for a quick blast,

 

Agreed. But speeds higher than 96MPH would have to be done like a "Push to pass" feature in that it lasted for no more than 30 seconds or so. Parts like tires and driveshafts have engineered limits. They'd be okay for a brief overspeed, but some folks would just ride that speed all the way across Nevada without some built in limiter.

 

The speed ratings on the tires are referring to sustained speed. Not a quick burst to pass a line of miss daisy's. Just a FYI.

 

There will be people out on the interstates and backroads trying to attempt this in mostly stock trucks if it was easy to remove the speed limiter!

 

The current F-450 is limited to 87mph; I know this because I hit it every single day on the way to work. All it takes is foot to the floor to pass someone on a two lane and by the time I come around I'm already on the limiter. That figure exists solely for the commercial tires, which are rated there at full load. They don't offer a prorated speed rating, but the reality is they are fine going faster when not under max load. I am still waiting until 5 Star has tuning available, and the second they do I am buying a tune for this truck. I've tuned nearly every vehicle I have ever owned, but it wasn't for the speed limiter, it was for transmission shift strategy and throttle response mainly.

This is the first Superduty however where the speed limiter is truly a nuisance for me, and I can't wait to get rid of it. Anyone who feels these trucks are somehow unsafe at speed clearly has never gone 160mph on the interstate at 3am for fun LOL. My 450 is more stable at speed than my past two trucks, and I have had both of them to 120+ many times. You start to get tire shake more than anything else at those speeds but as long as you aren't cruising there it's really not an issue, provided you are running appropriate tires and they have been road force balanced at speed.

After all that nonsense, to answer the OP's question, no, a tuner is not a waste of money if you know actually how to drive and enjoy doing it.

 

Exactly.. generally the speed rating on a tire is for 10 MINUTES at that speed.. a quick burst to 120or 130 is not gonna hurt them.. just make yer quick burst to your speed then back off.. 60 seconds tops.. Wayy to many grown men that are nannys.. i see semi's goin 100 down hills all the time.. enjoy life.. enjoy that rush..

 

Correct.. speed ratings are for 10 minutes at that speed.. a quick burst aint gonna hurt nothin.. my young days i didn think twice goin 120 on old bias belted tires..

 

I have never found the max speed bc the speedo stops at 100mph. But let me tell you, these things pull hard at 120+mph. No idea on the top speed but pretty sure ive eclipsed 130mark on 75mph rated 19.5” tires.


tire speed rating are generally for max speed with maximum rated weight on them. So if theres a lot less weight on them then max speed rating theoretically is greater bc not as much heat will be generated bc the tires wont be flexing as far.


I dont think anyone is talking about traveling at 120mph for any extended distance. Doesn't matter what vehicle your driving. Cruising at 120mph is going to end badly eventually.


everyone is ok with a speed limiter untill your in an emergency life or death situation. In an emergency situation i dont need a nanny getting in my way.

 

While recently buying a set of tires. I noticed the speed rating of tire for a SRW truck was 98 mph up to 108 mph ( if memory is correct ) and I assumed thats why out SD tap out at 96 mph. The first time I realized my truck wouldnt go faster, I was kind of disappointed. I drive to work at 4am and usually cruse at 80-85 mph and if i want to pass a vehicle, the limiter comes up very fast. Oh well, it is what it is

 

SRW trucks are limited due to tire constraints. I have been told that DRW trucks are limited to a lower speed due to limitations in the driveshaft speed/RPMs.

 

Semi tires are all stamped with a 75 mph max these days. When loaded heavy on hot days running too fast in a semi will blow tires. Just take a trip between Pheonix and Palm Springs on I-10 through the desert. The shoulder is littered with blown tire carcasses for 200+ miles.

I think the limiter is ridiculous myself but most people have zero common sense anymore so everything is dumbed down. We could use a lot more natural selection but the big corps are in it to save us from ourselves with the help of our worthless government. The other day I received a thick envelope from Ford about a "recall". It is an addendum to the owners manual because the govt didn't think they explained how to set your headrest well enough. Nannyism is a huge thing these days. Stupid and a waste of time and resources but I am sure it makes some "feel better"...