Speed Limiter Delete

[Driver72]

One of the things that has perplexed me a bit about GM over the years is their desire to put 99 mph top speeds on their trucks and large SUV's.

 

My question is, the 6.2 liter V8 with the 8 speed auto apparently has the ability to top out at it's 99 mph limiter by the end of the 1/4 mile.

So there is potential of it going 100+ in a 1/4 mile if it wasn't limited.

 

Is there a way to defeat the speed limiter without a tune?

I'd love to see what this truck will do at the drag strip "stock" without it being limited to 99 mph.

 

Plus I'd love for it to have a 110-112 mph top speed just in case I need find myself up along side a competitor, as every one of the competitor trucks are limited to 107+ mph.

[JoeTrahnier]

If you were looking for something to go fast in, why'd you buy a truck?

 

 

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[Driver72]

If you were looking for something to go fast in, why'd you buy a truck?

 

 

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Not the point of the question I asked. Thanks

[Knotsure]

They are big heavy dangerous machines and they are not design for top speed. That being said I am with you on that topic. I would love to go faster than 100, but I fully understand and won't argue with the limiter.

 

 

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[MikeNH]

Common knowledge that higher speeds can cause catastrophic drive shaft failure. Just look at dyno pulls for GM trucks. If you want to go faster, you need a tune.

[Imcrazy]

My cousin claims his is limited to 115, he has a 5.3. In a quarter mile ON A TRACK sure I'd push it above 100 but, I've been told that sometimes they limit speed due to driveshaft balance. I had my sierra up to about 90, it had hwy tires, my 16 silverado has AT tires and I have no desire to run it that fast....

[Matthew Kashima]

Just buy a simple hand help programmer. I have the Diablo Trinity and love it. I took of the speed limiter and modified several more parameters.

[redwngr]

One of the things that has perplexed me a bit about GM over the years is their desire to put 99 mph top speeds on their trucks and large SUV's.

 

My question is, the 6.2 liter V8 with the 8 speed auto apparently has the ability to top out at it's 99 mph limiter by the end of the 1/4 mile.

So there is potential of it going 100+ in a 1/4 mile if it wasn't limited.

 

Is there a way to defeat the speed limiter without a tune?

I'd love to see what this truck will do at the drag strip "stock" without it being limited to 99 mph.

 

Plus I'd love for it to have a 110-112 mph top speed just in case I need find myself up along side a competitor, as every one of the competitor trucks are limited to 107+ mph.

No.

[x219c]

I have the 5.3 and it goes over 100. It was at least 105. I don't know what it's limited at though. I'm 100% stock. Idk why some are limited lower than others, unless it's due to tire ratings.

 

If it helps, my truck is a 16 5.3/3.42 4x4 cc. Lt z71. Nothing special, it would seem. Came with the 18s.

 

 

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[BlueTopaz14]

Mine stops at 98 [emoji17]

 

 

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[djxn40]

The software is what limits the speed so obviously you need a tune. Either handheld or custom tune. I turned my speed limiter off. I have no intention in going over it anyway but I don't feel I need to be limited like a child either

 

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[Amuro]

Mine tops out at 99 and that's it.

[Driver72]

Thanks for the responses.

As I figured it would need a software flash, but I've never owned a GM truck before this, so I'm not in the know about all GM's standards, practices, or if their are other tricks that you can do without a flash. I'm also unaware of all their reasons (like some stated about the driveshaft).

However I did read an article that listed another (older model) GM truck with a top speed of 107. Maybe that was an anomaly like others have posted where their trucks actually do go above 99 mph. But I do know that many (or most) of GM's trucks/Tahoes/Yukons/Suburbans are limited to 99 mph for many years.

Motor Trend, or maybe it was C&D tested a new 6.2 with 8 speed auto and listed the 1/4 mile trap speed at 99 mph.

That's what prompted the question. Figured they might of hit the speed limiter sometime before the end part of the 1/4 mile, making me wonder if the truck would of hit 100+ had it not been limited.

 

Thanks again all.

[KARNUT]

I live in Texas and have travel north and west on roads with higher speed limits. Every truck I've owed with a limiter I've removed it with a hand held tuner. More than a few times being able to go faster has been a life saver. Two lane roads out west have high speed limits and passing would require a little more than 99 MPH. I think more than a few people would spend a few dollars more for tires that handle 120mph if that's what it takes. I can't imagine the drive shafts a problem. You could get all technical about gear ratios and driveshaft speed and despute that.

[vonshep]

99 is fast enough for me faster seems like fun then a deer jumps out and ruins your whole day