What is the top speed of the 6.7 Ford?

Stock Ford Super Duty pickups with the 6.7L Power Stroke diesel typically cap out around 100 mph (160 km/h) due to the factory electronic limiter. Exact figures vary by model year, trim, tire size, and whether the truck is towing or under heavy load.

How Ford limits top speed on 6.7L Power Stroke trucks

Ford uses an electronic speed limiter as part of the powertrain control module configuration to prevent excessive engine RPM and protect driveline components in heavy-duty use. The limiter can differ by market and calibration, and it can be influenced by the vehicle's axle ratio, tire size, and whether the truck is in tow/haul mode.

Common factors that influence top speed

Several variables determine the practical top speed of a 6.7L-powered Ford truck. The following list highlights the main ones you should consider before testing speed on a highway.

• Tire size and type: Larger or taller tires affect gearing and the actual top-end speed.


• Axle ratio and gearing: Numerically higher ratios reduce top speed; lower ratios can raise it, within engine and transmission limits.


• Electronic tune and limiter settings: Factory limters cap around ~100 mph in most configurations; aftermarket tunes can change this but may affect warranty and safety.


• Towing and payload: Heavy loads increase drag and drivetrain load, reducing achievable top speed.


• Transmission configuration: The 6.7L Power Stroke is paired with automatic transmissions (often 6- or 10-speed); gear ratios influence top speed and acceleration.


• Engine and cooling performance: Temperature, intercooler efficiency, and ambient conditions can impact sustained top speed.

In practice, most stock 6.7L Super Duty trucks reach about 100 mph in normal driving, with occasional reports of 105–110 mph under optimal conditions or with specific calibrations. Always drive within legal limits and prioritize safety.

What to check for your specific vehicle

To determine the exact top speed for your vehicle, consult the owner's manual, Ford's technical docs, or your dealership. If you have an aftermarket tune, refer to the tuner’s documentation, as it may alter the speed limiter and emissions settings.

Summary

The top speed of a Ford truck with the 6.7L Power Stroke diesel is generally around 100 mph, with variation depending on year, configuration, tires, and tuning. For precise figures, verify your specific vehicle's specs and settings, and always observe legal and safety limits.

What is the weakness of the 6.7 Power Stroke?

Downwind of the turbo on a 6.7L Power Stroke, the cold-side intercooler pipe—which routes boost from the engine's air-to-water intercooler toward the heads—is well-known for failing. The factory piece is infamous for becoming brittle over time, often cracks under boost, and some of them even explode.

Which is better, 7.3 gas or 6.7 Power Stroke?

The main differences are that the 6.7L diesel engine offers significantly more torque and better fuel efficiency (especially when towing), while the 7.3L gas engine is cheaper to purchase, lighter, and has more horsepower at higher RPMs. The best choice depends on your needs: choose the 6.7L diesel for heavy-duty towing and commercial use, and the 7.3L gas for lighter towing and general use where lower upfront costs are prioritized.
 
This video explains the performance difference between 6.7L diesel and 7.3L gas engines in Ford Super Duty trucks: 47sJB ReviewsYouTube · Nov 19, 2023
6.7L Powerstroke Diesel 

• Performance: Has substantially more torque, making it ideal for heavy-duty towing and hauling. 
• Fuel Efficiency: Gets better average fuel economy compared to the gas engine, though fuel costs can be higher. 
• Cost: Has a higher initial purchase price. 
• Maintenance: Can have higher maintenance costs and requires exhaust fluid (DEF). 
• Driving Experience: Less prone to "hunting" for gears when towing up hills. 
• Ideal For: Towing very heavy loads (14,000 lbs or more) or frequent commercial use. 

You can watch this video to see how the 6.7L diesel engine performs when towing heavy loads: 45sJB ReviewsYouTube · Nov 12, 2023
7.3L Godzilla Gas 

• Performance: Has more horsepower at higher RPMs, but significantly less torque than the diesel. 
• Fuel Efficiency: Lower fuel efficiency compared to the diesel, especially when towing. 
• Cost: Cheaper to purchase upfront. 
• Maintenance: Generally has lower maintenance costs and no need for DEF. 
• Driving Experience: Can feel underpowered when towing heavy loads and may require more gear-shifting. 
• Ideal For: Lighter towing (around 10,000 lbs) or general use where lower purchase cost is a priority. 

This video compares the 7.3L gas engine with the 6.7L diesel engine for truck owners: 58sT & T Landscape & MasonryYouTube · Dec 10, 2022

How do I turn off my Ford speed limiter?

Ford speed limiter removal typically involves reprogramming the Powertrain Control Module (PCM) using diagnostic tools like Ford IDS, or using third-party software like Forscan on certain models. Some vehicles may have a factory-set speed limiter that can be disabled via the "My Key" system through the instrument cluster settings, but this is different from a professionally installed limiter. Professional tuning companies can also remap the ECU to remove or adjust the limiter, sometimes alongside other performance upgrades.
 
This video shows how to remove the speed limiter on a 2017 Ford Transit using Ford IDS: 59sTool Hut USAYouTube · Dec 25, 2024
Methods for speed limiter removal

• Using Ford IDS or a similar professional tool: Technicians can use dealer-level software like IDS to access programmable parameters and disable the speed limiter directly. 
  • Process: Connect the tool to the vehicle, navigate to module programming, programmable parameters, and speed items, and then select "Disable Speed Limiter". 
  • Note: This method is often used for commercial vehicles like the Ford Transit. 
• Using Forscan: On some models, Forscan can be used to remove or adjust the speed limiter. You'll need an OBDII adapter and the Forscan software. 
  • Note: Forscan may not work for all models, and some limitations exist, such as not being able to remove all types of speed limiters, as mentioned on Facebook. 
• Professional ECU remapping/tuning: Performance tuning companies can remap the ECU to remove the speed limiter. 
  • This process can be done by either sending the module to them for reprogramming or by visiting a dealer who has the necessary tools. 
• Disabling "My Key": If your vehicle has a factory-installed speed limiter, you may be able to disable it by clearing the "My Key" settings. This is a user-accessible feature, unlike professional limiter removal. 
  • Process: Find the "My Key" option in the instrument cluster and follow the prompts to clear the settings. 

You can watch this video to learn how to disable My Key settings on a Ford vehicle: 1mPiscataway MechanicYouTube · Dec 4, 2020
Things to consider

• Vehicle type: The method of removal can vary depending on the vehicle. Commercial vehicles like the Ford Transit may use a different process or have different limitations than other Ford models. 
• Safety and legal implications: Removing a speed limiter can void your warranty and may lead to excessive wear and tear, reducing the lifespan of your vehicle. It is crucial to understand the risks before proceeding. 
• Professional help: If you are not comfortable with the process, it's best to consult a professional tuner or a Ford dealer for assistance. 

What's the fastest stock diesel truck?

The fastest stock diesel truck is the 2023 Ford F-250, with a 0-60 mph time of 5.5 seconds. It is the quickest stock diesel truck ever tested by Car and Driver, though performance can vary slightly depending on the specific configuration and testing methods. 
You can watch this video to learn more about this topic: 58sPowerstroke CentralYouTube · Dec 10, 2024

• Performance: The 2023 Ford F-250 SuperCrew 4x4 was clocked at 0-60 mph in 5.5 seconds.
• Speed: It achieved a quarter-mile time of 14.1 seconds at 97 mph.
• Comparison: This makes it faster than its 2020 predecessor, which had a 0-60 mph time of 6.1 seconds.