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06 chevy silverado canít go above 85 mph


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geesssare 
Member - Posts: 27
Member spacespace
Joined: July†07, 2005
Location: United States
Posted: July†14, 2006 at 11:06 PM / IP Logged  
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
Velocity Motors 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March†08, 2002
Location: Manitoba, Canada
Posted: July†15, 2006 at 8:33 AM / IP Logged  

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.

    Jeff
    Velocity Custom Home Theater
    Mobile Audio/Video Specialist
    Morden, Manitoba CANADA
    geesssare 
    Member - Posts: 27
    Member spacespace
    Joined: July†07, 2005
    Location: United States
    Posted: July†15, 2006 at 1:44 PM / IP Logged  
    I have the 5.3L. how much is the programmer? and do you need a laptop to adjust the PCM?
    adrianspeeder 
    Copper - Posts: 53
    Copper spacespace
    Joined: March†01, 2005
    Location: United States
    Posted: August†01, 2006 at 11:27 AM / IP Logged  
    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
    '02 F250 PSD, '97 F-150, '71 F-100, '66 F-250, '93, '92, '88, '84 Broncos
    Penn State electrical engineerin' major
    xtremej 
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    Joined: February†24, 2006
    Location: United States
    Posted: August†01, 2006 at 12:08 PM / IP Logged  
    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 $$$$.
    oscarnl86 
    Copper - Posts: 84
    Copper spacespace
    Joined: July†07, 2006
    Location: United States
    Posted: August†15, 2006 at 10:39 PM / IP Logged  
    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") 06 chevy silverado canít go above 85 mph -- posted image.
    i know some stuff and what i dont know ill make it up feel free to ask
    TruckSystem 
    Copper - Posts: 185
    Copper spacespace
    Joined: March†18, 2005
    Location: United States
    Posted: August†20, 2006 at 10:05 PM / IP Logged  
    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.
    2003 Chevrolet Silverado Standard Cab ~ Alpine CDA-9851
    Diamond Audio D3600.1 ~ 2x Diamond Audio TM310D4
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    geesssare 
    Member - Posts: 27
    Member spacespace
    Joined: July†07, 2005
    Location: United States
    Posted: October†20, 2006 at 6:51 PM / IP Logged  
    TruckSystem wrote:
    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.
    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?
    auex 
    Platinum - Posts: 5,041
    Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
    Joined: December†23, 2002
    Location: Arizona, United States
    Posted: October†20, 2006 at 7:03 PM / IP Logged  
    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.
    Certified Security Specialist
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    geesssare 
    Member - Posts: 27
    Member spacespace
    Joined: July†07, 2005
    Location: United States
    Posted: October†20, 2006 at 7:07 PM / IP Logged  
    How does the comp limit the speed? By cutting fuel, or does it have to do with the VSS?
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