Speed governor?

[Magoomba]

I recently had the chance to take my 2015 Sierra Denali 5.3 to private facility where I could open it up a bit. Found out the engine speed is capped at 98 mph. It was revving nicely (and quite smoothly) through the gears and when it hit 98 mph, the RPMs dropped like a rock and it quietly continued to cruise at that speed, even though the accelerator was still on the floor. Needless to say, I was kind of disappointed. Mind you, I would not drive like this on public roadways, but nonetheless, I've never owned a vehicle that was governed like this.

 

Anyone else know about this "feature" included in this truck?

[RyanbabZ71]

Yes highly talked about topic. It is governed because your tires aren't rated for higher speeds.

 

 

Ryan

[SouthernSilveradoGuy85]

Mine's at 98 also, while others I've read posts that are different. It's not a big deal anyways unless it's governed to low that you can't pass on the interstate. Other than that it needs a governor mostly to protect you from yourself.

[redwngr]

GM pickups have had this 'feature' for quite a few years.

[Liquorice]

I got stopped by a cop a few years back.

He was in a GM truck, I was in a BMW 325is

He didn't have radar, but the ticket said 160km plus as his truck hit the governed speed and he couldn't catch me.

He got me at a red light - I didn't even know he was following me!

 

Sam :-)

[POS VETT]

My GMT-800 had a speed limiter at a slightly higher speed, about 110 mph if I remembered correctly. My K2XX is limited just a hair under 100 mph when looking at the analog speedometer.

[RyanbabZ71]

My GMT-800 had a speed limiter at a slightly higher speed, about 110 mph if I remembered correctly. My K2XX is limited just a hair under 100 mph when looking at the analog speedometer.

The gmt800 was also set to 98 mph factory just like the 900 and k2 series trucks

 

 

Ryan

[brokesilverado]

The speed governor was first installed in 1993 trucks.

[02suburbanZ71]

So pre 1993 does not have any speed limiter, ?

[MikeNH]

So pre 1993 does not have any speed limiter, ?

 

No but they probably won't get above 100 anyhow.

 

 

But seriously you have to be a moron to run these trucks above 100 without proper tires or driveshaft balancing.

[02suburbanZ71]

No but they probably won't get above 100 anyhow.

 

 

But seriously you have to be a moron to run these trucks above 100 without proper tires or driveshaft balancing.

I was just curious because i was going 70 one night and my pal with an 88 5.7 pulled so far away i couldnt see his lights lol and i thought he had a limiter. Thats how he blew the stock 5.7 too doing a truck pull at WOT with no rev limiter. BOOM

[thewhitestallion]

I was just curious because i was going 70 one night and my pal with an 88 5.7 pulled so far away i couldnt see his lights lol and i thought he had a limiter. Thats how he blew the stock 5.7 too doing a truck pull at WOT with no rev limiter. BOOM

 

rev limiter and speed governor are two different things.

[02suburbanZ71]

 

rev limiter and speed governor are two different things.

I know

[2017SierraSLT]

Tune it, and the governor will be history. However. this will be traced if any warranty work is performed on said truck.

[brokesilverado]

So pre 1993 does not have any speed limiter, ?

Let me restate pre 1993 had no rev limiter or speed limiter. I had a 93 & a 94 both I installed jet stage 2 e prom chips in. It would limit the top speed to approximately 128mph. A friend had a 92 & he would pass me by at a pretty good clip. If I had to guess his would hit 130 or 135 it just took it forever to get there.