I hit 100 in my 2000 Z71 with the 5.3 the other day, (yeah, yeah, I know),
and it seemed to stumble once I passed that mark. I got off it right away
but I'm curious to know whether or not the top speed on this vehicle is
governed. If it is, can it be changed and how will that affect warranty?
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When I bought a power chip for my 88 S-10 a few years ago, the
that came with the chip mentioned a rev-limiter and illuded to a speed
limiter in some cases. In a 2000, the computer would certainly have the
inputs/outputs to accomplish it - but I don't have any direct knowledge
of one. I do know that a few years ago all of the speed-bikes did
equal top-speeds in some of the time-trials (173MPH) - and that it was
widely speculated that there was either a rev or speed limiter in the
computers somewhere (speed was more heavily speculated cause they were
different brand bikes).
Now a days the thing to watch out for seems to be the little black boxes
that tell on you. ie: broadcast your acceleration and top-speed history
to every cop you pass. Beeee scaaaaaaaared! LOL.
Yes it is set at 100. It can be changed BUT not easily, it is set
because A. the tires are not speed rated for any higher. B. It's a TRUCK
not a sports car, guess what happens if you have to rapidly avoid
something? I'll give you a hint, Roll, Roll, Roll your truck, heavily
down the road.... and YES it will void the powertrain warranty, because
it would be considered "modification for racing" regardless if you race
it or not. I'm kind of surprised Manufacturers don't void a lot more if
they find a chip in them.
hypertech power programmer will allow you to tell your truck you have higher
speed rated tires.
still, i think the programmer will limit out about 124. H Rating?
i have one on mine. http://www.truckperformance.com
No. Federal law prohibits a dealer from voiding your warranty just
because you are using aftermarket parts, with only two exceptions:
A warranty claim can be denied only if the part is the cause of damage,
This is the part they use to void warrantee coverage if you use a K&N
filter, or other part and it causes problems.
or if it adversely affects the emissions or the emissions system.
Guess what adjusting the programming of the factory computer does? Ford
and GM have already stated that they will NOT cover warrantee work on
vehicles that have a chip in them or if the factory programming has been
We had a case last year of a Corvette that came in running
rough. Long story short.....had a bunch of bent valves. Now,
this is pretty much impossible with stock software. You can't
over rev it unless you happened to grab a very low gear at
high speeds (which poses it's own difficulties.) The customer
had non-stock intake, non-stock exhaust, and non-stock
wheels and tires. Took the engine apart to check possible
problems with the timing chain and gears. Nothing found.
Anyway, after some bickering and fighting, the customer
gave up and paid for a brand new motor as the district
service manager refused warranty on the engine.
We suspected that he had reprogrammed the software
at some time, but (as far as I know, someone can correct
me if this is wrong) apparently you can revert back to
factory software quite easily. I suggested to the DSM
that it might not be a bad idea if GM includes some sort
of flagging mechanism to tip off the dealer tech's if
non-factory software has been installed at any time.
Ya know Ian I bet in a couple of years cars like the Corvette will come with
OnStar as standard and when the car is started with modified software the
OnStar system will let GM know that you did it.
Probably will be powered by Bill Gates!
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