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Is the a speed limiter on the duramax?

skav

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skav Enthusiast

skav

Posted
Posted

I was on the freeway following my wife in her Mini Cooper S, when she took off so we started playing. At close to 100, my truck felt like it laid down.

 

Then I started checking the dic thinking maybe there was a speed limiter but couldn't find one. Can anybody confirm if they do have a factory speed limiter? My speedo goes to 140 if that helps;)

 

 

 

 

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SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

You can't adjust the governor in the DIC, the only thing in the DIC that's similar is where the truck can warn you when you reach a certain speed. It's probably governed at 98 like my '14 and my 98 Z71 that I had. Some K2s are governed at a little over 100 but there's no common denominator. Some say it's tire ratings, but not really agreeing with that unless I see actual proof from GM that that's the reason.

skav Enthusiast

skav

Posted
  • Author
Posted

You can't adjust the governor in the DIC, the only thing in the DIC that's similar is where the truck can warn you when you reach a certain speed. It's probably governed at 98 like my '14 and my 98 Z71 that I had. Some K2s are governed at a little over 100 but there's no common denominator. Some say it's tire ratings, but not really agreeing with that unless I see actual proof from GM that that's the reason.

Yeah, it seemed to shut down at 98. Can the dealer raise it or is it something that can only be done w a tuner?

 

 

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SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

Yeah, it seemed to shut down at 98. Can the dealer raise it or is it something that can only be done w a tuner?

 

 

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Tuner

 

No need to even ask the dealer because they will just ask why are you going that fast in a heavy full size truck. I see no need to go that fast, but I can't tell anybody what to do lol.

skav Enthusiast

skav

Posted
  • Author
Posted

Did i forget to mention the disclaimer that it was done in a closed course with professional drivers?

 

 

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MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Only way is with a tuner. Speedo range doesn't matter and realistically it only goes to 140 to accommodate use in Canada where they use the metric system. Especially on a HD truck I'd be wary about exceeding the speed rating of the tire.

SMiller Senior Enthusiast

SMiller

Posted
Posted

Leave it alone, I have seen the YouTube videos of driveshafts exploding at high speeds.

 

I love to drive fast and do stupid stuff but 100mph is plenty for a tall 7,000lbs truck with E range tires and stock driveshafts.

02suburbanZ71 Senior Enthusiast

02suburbanZ71

Posted
Posted

Only way is with a tuner. Speedo range doesn't matter and realistically it only goes to 140 to accommodate use in Canada where they use the metric system. Especially on a HD truck I'd be wary about exceeding the speed rating of the tire.

His truck can definitely use that 140 speedo! Just gotta get a good tune [emoji4]

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Hardly. Driving a truck that fast without proper tires and driveshaft mods is stupid.

02suburbanZ71 Senior Enthusiast

02suburbanZ71

Posted
Posted

Yeah with the factory driveshaft nobody on here would recommend that. Really need to have high speed tires for going 140. very dangerous

  • 4 years later...
Monkeyman51 New Member

Monkeyman51

Posted
Posted

No tuner will over write the programming on the truck, however if the speed limit is let’s say 75 and three cars are going 70 in front of you 

you may have to accelerate to above 90 to

pass all three, by the way you can’t go 100 mph in a L5P it falls on its face just above 94

Colossus Senior Enthusiast

Colossus

Posted
Posted

I have a Hypertech Max Energy tuner that allows me to program in the limiter... Currently have it set to 130.  Would I drive that fast?  Hell no.  But it is nice being able to hammer on it and pass a long line of cars on a 2 lane highway and do it quickly.  I've had it to 115 and didn't take it any faster.  Never will.  Unless being chased by a bunch of pissed off women!

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