06 chevy silverado can’t go above 85 mph

I took my truck to a local dragstrip just to see what it could do. To my suprise the truck would not go past 85 mph. I was curious to know if anyone knew why and if there is any way to disable it or modify it

Do you have the 4.8 L ? If so you can get a power programmer for this vehicle that will :

Adjust Shift Points

Adjust Shift Firmness

*Eliminate Speed Limiter*

Recalibrate Speedometer for Larger Tire Sizes

Recalibrate Speedometer for Gear Changes

Adjust Rev Limits

Adjust Cooling Fans

Choose from three available Performance Settings

We sell these all day long up here and the customer have positive things to say about them. Most of the guys up here love the diesel programmers that give them an extra 100+ horses to their trucks.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

I have the 5.3L. how much is the programmer? and do you need a laptop to adjust the PCM?

Cheap trick is to turn your key to start. Knocks out the computer out of the loop and as long as the clutch isn't pushed/shifted to P or N it won't crank.

Adrianspeeder

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'02 F250 PSD, '97 F-150, '71 F-100, '66 F-250, '93, '92, '88, '84 Broncos

Penn State electrical engineerin' major

The power programmer is 349.99 retail plus ship, it is the same for 4.8,5.3 and 6.0. You can also get a superchips programmer to do the same. And in reality there are many more programmers out there but these 2 sell and installed nearly a hundred. They just plug into your diagnostic port bottom of the dash. You go through and select the options you want and then it will upload into the vehicle computer. Just make sure to program it back to stock if you have any service work or if the dealer hooks there computer to it and flashes it you'll chance damaging it $$$$.

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like nousername says there might be something else like tire size afecting it and i know that for a fact. i have  a 03 silverado with the 4.8 and before it will shut off at 99 and it still does but it takes it a wile to get up there. the reason is that i have oversise rims (22")

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i know some stuff and what i dont know ill make it up feel free to ask

99 mph is the stock setting for newer Chevy trucks to stop accelerating, the cheapist way to remove this without having a laptop and the programs to do it yourself is to get a mail order tune from www.wait4me.com, which runs about 150 bucks, or 75 if you send them your original PCM.

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2003 Chevrolet Silverado Standard Cab ~ Alpine CDA-9851
Diamond Audio D3600.1 ~ 2x Diamond Audio TM310D4
Diamond Audio D3400.4 ~ Diamond Audio Hex S600s
AstroStart RS5204 Remote Start/Alarm

TruckSystem wrote:

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99 mph is the stock setting for newer Chevy trucks to stop accelerating, the cheapist way to remove this without having a laptop and the programs to do it yourself is to get a mail order tune from www.wait4me.com, which runs about 150 bucks, or 75 if you send them your original PCM.

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I just got my laptop 2 weeks ago!! Would it be possible to write a program or is there a standard program that you use?

Have to love speed limiters. Goes to show that you should get manual transmissions, hehehe. I know the computer can still limit the engine even with manual.

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

How does the comp limit the speed? By cutting fuel, or does it have to do with the VSS?

The ecu has speed sense going to it and since it controls the fuel it can change the rate the injectors pulse.

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.