A different speed limiter question?

[RollaMo]

Originally Posted by jkchambless

Wait, what's to stop any LT or SS driver from buying tires that are not rated at 155mph? Has anyone actually tested whether a dealer would be willing to both sell a person the higher rated tires AND change the limiter? I keep hearing people say that the dealers won't do it but no examples.

You will never get a dealer to change any of the factory parameters in your cars computer.
Just ain't gonna happen.

If you want to put lower speed rated tires on your factory SS, that is on your shoulders. YOU changed your car, and GM can't be held responsible for that.

In the same way, if you have a dealer put higher speed rated tires on your car, they will still NOT change the factory parameters of the computer.
That would put the liability on their shoulders, and they are not going to do it.

[OK2DRUL]

Wait, what's to stop any LT or SS driver from buying tires that are not rated at 155mph? Has anyone actually tested whether a dealer would be willing to both sell a person the higher rated tires AND change the limiter? I keep hearing people say that the dealers won't do it but no examples.

I don't know of a tire that would fit that the stock RS/SS wheels that would not be speed rated to 155mph. Even Continental ExtremeContact DWS tires have a W speed rating that's 168mph.

I'm sure someone could find a dealer out there that would do this for them, but at what cost? The wheels, tires, and computer upgrades would cost more than the difference in price from a LS to a LT I'm sure. Seems like it would be diminishing returns for someone that took the cheap way out in their purchase to begin with....

[wadeh]

Originally Posted by cornerspeed92

Yes,i know this.Im just asking a hypothetical question. I was just wondering since it all has to do with the tire package,how they could deny anything, since the car was just being brought up to the specs of every other car.

I believe that the issue is that they know that the tune has been changed because of a checksum. They do not know what you changed. Sure, it may have just been the speed limiter, but it could also have been timing or mixture settings that could actually damage the engine.

Also, I believe that the system is set up with a count of how many times the tune has been changed. So if you set up a tune that harms your car, and then return it to stock tune, they will still see that it was modified and they won't be responsible for the consequences.

[SteelCamaro]

Chances are, if you're in a position where you need your LT to go faster than 118, you will have already made significant modifications to it anyway, rendering any warranty issue pointless.

[OrangeVert]

Originally Posted by wadeh

I believe that the issue is that they know that the tune has been changed because of a checksum. They do not know what you changed. Sure, it may have just been the speed limiter, but it could also have been timing or mixture settings that could actually damage the engine.

Also, I believe that the system is set up with a count of how many times the tune has been changed. So if you set up a tune that harms your car, and then return it to stock tune, they will still see that it was modified and they won't be responsible for the consequences.

Makes pefect sense. Dang algorithms!

[90503]

Originally Posted by cornerspeed92

I guess i need to get out of the house and start getting a life ,i apparently have too much time on my hands No im not interested in changing any tune,just throwing this out for a discussion,and im sure i was wrong about it being an LT,i guess the base model is the LS,thanks for the clarification

Mark, sign up for auto-x Saturday at Fontana...that'll get you out of the house....lol....

[SSMickey]

Originally Posted by cornerspeed92

As we all know we are limited to 155(except ZL1-LT) and since the LT comes with 18" tires i believe...and the car is limited to 118 MPH because of this. If someone were to put the RS package tires and rims(Pirellies)on,and raise the limiter to the same as everyone else 155,how could GM void there warranty? I mean, the LT is the same exact car as the 1LT,2LT....correct?

There is one way...MAYBE. If you get the dealership to install the correct tires and wheels, they MAY be willing to flash the correct calibration from GM. I know back in 04 when I bought my Silverado, Chevy had an upgraded wheel/tire set that also came with a new calibration for the new tire size.

[JCunningham]

better change the brakes too if GM would ever do it. I dont think the factory brakes LT will do much to slow you down at 155 or GM didnt test them going that fast

[cornerspeed92]

Originally Posted by 90503

Mark, sign up for auto-x Saturday at Fontana...that'll get you out of the house....lol....

Hey Tom,yeah i might be instructing on the big track,if so i will stop by and say hi