Jump to content

Speed limiter delete

Stephen L. Pannell
 Share

Recommended Posts

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
On 5/10/2025 at 3:32 PM, GETGONE said:

 

I've run mine to 112 countless times with zero issues. 31K miles and still going strong. Took it to a test and tune and ran about a dozen passes trying various launches, no issues. Best of 14.2 in the 1/4.

 

Nice time!  If memory serves, that 112 mph problem applied to K2 1500s.  I recently learned that my kids have been exceeding 112 with their GMT900s with 6.2s too!  

  • Replies 99
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

eppieguy
eppieguy

Maybe 

Silverado4x4
Silverado4x4

Tires and driveshaft. Once a driveshaft comes out of balance at those speeds it will destruct with in seconds.

CamGTP
CamGTP

They do make one.   It requires voiding your warranty and spending a minimum of $1,900 to purchase a new unlocked computer from HP Tuners and the credits to tune it.   I doubt you'

Posted Images

redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)

Driveshaft seems to get a lot of the press, but tire speed rating should be looked at too. 

(yes, I realize that exceeding speed rating isn't likely to cause immediate failure...)

 

Do they know about tire speed ratings? 

 

Speed (and load) rating will also be on the tire.

Factory tires on my '21 were speed rating S.

 

image.png.5304200992d5297646c02b5c85367739.png 

 

 

S

An S speed rating indicates the tire has been approved for speeds up to 112 mph (180 km/h) under optimal conditions. Everyday passenger vehicle tires can be S speed rated, but S tires often prioritize specific performance or function. Many all-terrain LT tires are becoming available in an S rating as that’s the OE spec for many of these vehicles like the Ford Raptor. 

 

 

This is was on a set of Duratracs I used to have.

Load load rating 109, speed rating S

image.png.a570718ea773e27958721328faf017bd.png

 

 

Current '23 has  275/60R20 115S 

So again, speed rating S 

 

My current winter tires are speed rating R.

 

Speed rating R allows for speeds up to 106 mph (170 km/h) under optimal conditions. Like Q, R tires generally prioritize a particular function or unique performance over maximum speed capability. R speed tires are rare but can be found on some heavy-duty light truck (LT) tires, as well as studdable and studless winter tires.

 

Edited by redwngr
redwngr Senior Enthusiast

redwngr

Posted
Posted

 

Speed Rating Miles/Hour KM/Hour Typical Application(s)
L 75 120 Trailer tires
M 81 130 Spare tires
N 87 140 Spare tires
P 93 150  
Q 99 160 Select winter tires
R 106 170 Passenger and light truck tires
S 112 180 Passenger and light truck tires
T 118 190 Passenger and light truck tires
U 124 200  
H 130 210 Passenger sedans, coupes, SUV and CUV’s tires
V 149 240 Performance sedans, coupes, and sports cars tires
W 168 270 Performance sedans, coupes, SUV and CUV’s tires
Y 186 300 Exotic sports cars tires
Z 149+ 240+ High-Performance vehicle tires
  • Like 1
GETGONE Enthusiast

GETGONE

Posted
Posted

Trail Bosses with the 18" tires are electronically limited to 98mph due to tire rating. The 20" wheel option bumps the limiter up to 112mph because of the S speed rated tires.

PunchT37 Enthusiast

PunchT37

Posted
Posted
3 hours ago, swathdiver said:

 

Nice time!  If memory serves, that 112 mph problem applied to K2 1500s.  I recently learned that my kids have been exceeding 112 with their GMT900s with 6.2s too!  

LOL. Busted.

 

My 2000, GMT800, that I still have, has a 128 limit. I have seen 4000 rpm`s in overdrive with 16 inch wheels and 3.73 gears. Poor 100 mph speedo.

  • Like 1
redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)
16 hours ago, PunchT37 said:

LOL. Busted.

 

My 2000, GMT800, that I still have, has a 128 limit. I have seen 4000 rpm`s in overdrive with 16 inch wheels and 3.73 gears. Poor 100 mph speedo.

I'm curious what the tire loading label on the doorpost lists as the speed rating?

Edited by redwngr
PunchT37 Enthusiast

PunchT37

Posted
Posted
1 hour ago, redwngr said:

I'm curious what the tire loading label on the doorpost lists as the speed rating?

S. But, this truck has a whole new computer.😉

redwngr Senior Enthusiast

redwngr

Posted
Posted
4 hours ago, PunchT37 said:

S. But, this truck has a whole new computer.😉

 

Thanks.

 

So if they were installing S rated tires on (at least some) 2020's the original limiter was likely lower/

 

 

 

 

PunchT37 Enthusiast

PunchT37

Posted
Posted
4 hours ago, redwngr said:

 

Thanks.

 

So if they were installing S rated tires on (at least some) 2020's the original limiter was likely lower/

 

 

 

 

 

4 hours ago, redwngr said:

 

Thanks.

 

So if they were installing S rated tires on (at least some) 2020's the original limiter was likely lower/

 

 

 

 

Factory limiter on that 2000 truck was 96 mph.

  • Thanks 1
  • 5 months later...
Silveradgo Enthusiast

Silveradgo

Posted
Posted (edited)

I have yet to top mine out since I had it unlocked and then tuned it (High Country 6.2 10 spd), but my tires will limit me as I have a brain. But damn the ecm and tcm tune feels great. If anybody is on the fence, just do it. I'm still tweaking some of the shift times to get rid of the sluggish shifts on lower power shifts. mid power shifts are .200 seconds and full power are .100 seconds, tires chirp with only a small boost in pressure and reducing shift times.

Edited by Silveradgo
johnnyquick Enthusiast

johnnyquick

Posted
Posted
10 hours ago, Silveradgo said:

I have yet to top mine out since I had it unlocked and then tuned it (High Country 6.2 10 spd), but my tires will limit me as I have a brain. But damn the ecm and tcm tune feels great. If anybody is on the fence, just do it. I'm still tweaking some of the shift times to get rid of the sluggish shifts on lower power shifts. mid power shifts are .200 seconds and full power are .100 seconds, tires chirp with only a small boost in pressure and reducing shift times.

Who tuned it and how much did it cost you?

Any mods beside the tune?

Silveradgo Enthusiast

Silveradgo

Posted
Posted (edited)

I tuned it. Only have a K&N Blackhawk intake on it for the sound. Longtubes will be the next go-fast mod.

 

Edit: I'll have to get a video of the induction noise during the 1-2 shift at like 4.5k 🤤

Edited by Silveradgo
GETGONE Enthusiast

GETGONE

Posted
Posted

How did you tune it since you have to send in the ECM last I knew to get it unlocked to be able to tune it.

Silveradgo Enthusiast

Silveradgo

Posted
Posted
8 hours ago, GETGONE said:

How did you tune it since you have to send in the ECM last I knew to get it unlocked to be able to tune it.

See my earlier post

GETGONE Enthusiast

GETGONE

Posted
Posted
4 hours ago, Silveradgo said:

See my earlier post

You have 3 posts. You just said you had it unlocked and you tuned it. That tells me NOTHING. WHO unlocked it? WHAT are you using to tune it? New member sounds like a troll.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,897
    Total Members
    8,960
    Most Online
    ncleg
    Newest Member
    ncleg
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,086 Guests (See full list)

  • Latest Articles

  • Posts

    • dna9656
      New to Me 2010 SLE (Quirks, Issues)

      By dna9656 · Posted

      Your tire pressure issue may just be batteries, you can reset them using tge Ing switch (I think) and the owner's  manual. ChatGTP will b e a faster, better help than Google.
    • Another JR
      Towing In Loose Gravel

      By Another JR · Posted

      The thinking is that starting out in a higher gear makes it easier to avoid applying excessive torque when pressing the gas pedal. In a modern 4wd truck with 4 low and a limited slip or locking rear end, I would use 4 low and try to crawl up the ramp. Sometimes if they are too slippery, you have to back up to let the boat have some bouyancy, and then accelerate briskly to get some momentum to help you pull the through the slippery parts. 
    • XY74
      Roll up bed cover experiences

      By XY74 · Posted

      I have a Retrax pro that I first had on my 2020 chevy and transferred it to my current GMC.  It stays in the garage most of the time, so hard for me to judge it's long term weather resistance.  It still works perfectly, been very durable.  It doesn't see oil patch usage, but it's not a mall queen.  It keeps most things mostly dry (small leaks) and the security of it is enough to slow someone down but not keep them out for long.  I would buy one again, it works for me.     
    • fm2176
      New to Me 2010 SLE (Quirks, Issues)

      By fm2176 · Posted

      Thanks to the convenience of Amazon, I was able to get a few things done to the truck today.  I installed Carquest Premium oil and air filters with five quarts of Mobil1 High Mileage 10-30 along with a quart of Pennzoil Platinum 5w-30 I already had.  The latch for the flip up center console lid was broken so I replaced it along with the power mirror switch.  I found my push retainer assortment this morning and reattached the plastic under the bumper and it was only held on with a few screws and retainers.  Then I programmed a new remote keyless entry fob so I can lock my dog in the truck when I take her out with me (I've got to keep the air going for her since it's been in the 100s).  Finally, I ordered some LED interior bulbs and replaced the reading lamps.  The front lights are working fine while one of the back lights only works intermittently and the other not at all.   While under the truck, I found the source of at least one of the noises: the sway bar links need replacing.  I ordered a set of Suspension Dudes links with Code Red bushings.  Never heard of them, but they're made in the USA and have decent reviews.  While making yet another Amazon order, I went ahead and added a set of front tow hooks.  I went with red, since that's the color of the sway bar link and bushings and it should look decent enough on a black and chrome truck.  Speaking of which, it doesn't bug me much, but the passenger side mirror has a chrome cap while the driver side doesn't, so eventually I'll make them match one way or another.  Oh, and I ordered a $20 TPMS reset tool.  No idea if it will do anything for my sensors but it was cheap and will work for the Ford Transit Connect as well.     For tradition's sake, I ordered a new oil change wrench.  I kept the Snap-On 9/16"x15mm GM wrench I bought when I was 18 in the 2006 GMC from the time I bought that truck until the truck was lost.  While I was tempted, there's no need to spend $80 for a new SO wrench, or even $50 with shipping for a used one on Ebay.  I just bought a Duratech 15mm extra-long ratcheting wrench to do the job as needed.  It works, and if I like that wrench enough, I'll buy the set.  
    • Another JR
      Multigate electrical problem

      By Another JR · Posted

      The recall is for exactly this issue - those drain holes combined with the limited environmental capability of the tailgate electronics card inside the tailgate were a problem. The “safety issue” was the potential for the tailgate to spontaneously open, but all kinds of tailgate misbehavior can occur from water contamination of that control card.    There is no real fix yet. The initial recall just disabled the tailgate. Later, when parts became available, they would replace bad parts with new parts of the same bad design. My dealer is going nuts because the few times I let them get their hands on my truck, my tailgate is off due to a slide-in camper installation. They really want to cut my tailgate wires, but I won’t give them the chance. I will let them get their dirty hands on it when a real fix (redesign) is available.  My tailgate, which works just fine with sealant plugging the drain holes, will remain safe in a dry storage crate until then.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...