I was taking a trip the other day and needed to pass some slow traffic and found that the engine quit making power at around 95 mph. From 45 to 95 comes fast. Not good to have power stop when passing.
I know it is not safe to be driving our trucks at around 100 mph, but for a short burst to pass traffic, it is more dangerous to have the engine quit making power while you are trying to pass.
We purchased our truck new in 2012 so since I just found out about the problem, I have not had the truck up to 95 before now.

 

It is set to stop making power at 95 mph due to tire limits. The only way I'm aware of to defeat this is with a tuner.

 

If you check this thread about enabling the exhaust filter screen, you can see one of the parameters that can be change is the "Speed Control". This might be the one you want disabled. Now, will your local shop change the parameter is the question or can you find someone locally with a clone VCM or enhanced version of Forscan.

https://www.ford-trucks.com/forums/1...ut-dealer.html

 

How many rpms were you turning? You might be up against a rev limiter that prevents engine damage.

 

I was not looking at the rpm gauge, but with the high gear ratio and being in drive, I would think the rpms would be low. I don't know when or if I will be taking the truck up to 95 mph again, but if I do, I will check the rpms.

 

I just got off the phone with our local Ford service manager. He said it would be $105 to turn the speed limiter off. I asked him why a five minute job would cost $105. He said that they had to reflash the computer and would need all sets of keys to do this.

Does this sound right to you?

 

I bet it takes 10 minutes and the charge sounds normal. Some dealers will do it for 1/2 labor rate instead of an hour. Be thankful you are not in Alaska where the labor rate is $130/hr or more.

 

I'm going to disable the 'Speed Control' setting at lunch and report back.

When I read 'speed control', I automatically assumed 'Cruise Control'

The speed limiter is at 97 I believe and it is due to tire limits.

While that fast isn't something I regularly do, I have found myself hitting that quite easily when passing on a two lane road, especially in Montana.

While your tires won't explode when you hit 98, I wouldn't drive that fast for an extended period due to heat build up. But a short burst to pass should be fine.

 

Confirmed, the 'Speed Control' setting is NOT the speed limiter. It disables the Cruise Control.

I also tested the DRL function, it works, but it uses a low power version of the low beam headlight. I don't care for that, so I left it disabled.

 

I just got the latest Forscan app and the extended license key so I can play around with it as well. I will say that the app saved my bacon when I was on my way up to Alaska in 2014. The trucks HVAC quit working. I could hear the fan turn on but no air would blow out of anywhere... Running the complete vehicle test fixed it. Once the app forced the truck to cycle through the HVAC vents it started working again.

I have DRL's on... Unfortunately that is how they work. Sucks, but at least I don't have to worry about getting a ticket on some of our lights on all the time roads.

On other neat thing is that you can change tire sizes which is nice, since I am planning on getting smaller winter tires.

 

With these trucks, you will run out of horsepower well before you run out of RPM's. With the speed limiter off, these things will haul some serious buns.

 

I don't think I would be pushing these trucks to the HP limit speed wise... The aerodynamics and suspension for mid to upper triple digits on a stock truck would be a tad scary, IMHO.

 

Aerodynamics was specifically why I said you would run out of horsepower before RPM's. I'm sure someone could do the math with final drive ratio, RPM's and speed, but if you had the power to hit redline in 6th, you'ld be movin!! I've had mine way too fast a few times. It can get dicey, and I can't get the mental image of sliding to a stop on my roof in the event of a tire failure, out of my mind.

 

To me it's the sudden stop from over 100mph that gets me...

 

Sudden stops can be harsh as well.