Top Speed Limiter

It appears that the Factory computer has limited my top speed to 95 mph. With over 400 hp under the hood I'd like to see what my truck can do. Aside from disableing the top speed limiter with a Hypertech reprogramming system or a chip is there any other way to disable this Factory system.

Mahalo,
Haw'n Hog

not that im aware of

I have dealt with the same deal on my 2000 Sierra. I'm at 2800 RPM when my limiter kicks in @97MPH. I would like to see the rest of the story without installing a chip.

the only way to bypass or change your speed limiter, 1998 or newer, is with a Hypertech tuner.

your computer is programable. 1997 and older were learned units that had to have a new PROM (chip) installed, to change any fuel/timing inputs.

look at the bright side: at least you can change it with little or no effort. :iceslolan

Mahalo guys! Because my Truck is equipted with a Whipple Supercharger I can't mess with the Factory computer EXCEPT to change the speed limiter. I just didn't want to buy a Hypertech tuner ($300+) for just that purpose. 400+ hp and I can't get pass 95mph. I do get there awfully fast though.....!

Guess I'll live with it - FOR NOW!!!

i'll give you 60 days before you buy one and really stretch that thing out...........!!!!!!!!!! :biggrin:

wait you spent 3-4 grand for a supercharger and 5-6 hours putting it on and you have a problem spending $300 and 20 minitutes to increase your top speed to 129.

so after bragging to everyone about how your supercharged 400+ hp truck really moves i would love to see your face when the guy who spent 300 for the proggrammer blows by when your truck falls flat on its face at 95.

i spent the money and time putting a supercharger on mine and had no problem spending the extra 300 so i wouldn't have to hide my face as someone blew by me at 110

I bought the truck outfitted with the gear. However, point well made!

see if you can sweet talk a friend at a dealer to go inside and disable the limiter all together.

I bought the truck outfitted with the gear. However, point well made!

if you bought the truck setup already ,make sure you got the programer for the s/c, most kits come with a hand held programer that changes the timing and fuel settings, if you take it somewhere and they accedently reprogram the computer you could have some serios proplems.
if you didn't you might want to call whipple and see if there kit came with one, if it did you definitly want to get a replacement, and ask if they can set it up to do the basic adjustments shift,rpm,speed, tire,gear ect.
try and kill two birds with one stone.

my s/c came with one from superchip (it was a powerdyne)

truck moved even with 35" tires, too bad the peice of shit locked up on the highway in vermont last year.
really miss the extra power, going to try a magna charger later this summer
you might want to get some traction springs from jcwhitney or traction bars, i got some stainless from rcd had the springs on before, really help the truck hook up off the line and keep the springs wrap from making the tires hop.

Mahalo guys! I'll check my Chevy (dealer) sources to see if I can get someone there to kill the top speed limiter. I'm pretty sure (but, then what do I know...) the Whipple doesn't come with a program tuner. I've got the installation manual and there is no mention of it. Aside from that, no one I dealt with mentioned one. I was told and it's mentioned in the insattlation manual not to mess witht the factory computer (with the exception of the top speed limiter. It also states not to mess with the Whipple computer. I'll check with Whipple to see wht is allowed.....

The State (HAWAII) just passed a law that can cause you to lose your license for up to 5 yrs if you are caught: 1) going 35 mph over the limit, 2) street racing, AND 3) going over "90" mph.

That being the case I'm not in a rush to over ride the T S Limiter. But it will go one day.

well that really sucks, good thing i don't live in hawaii my license would be gone.

WAIT A MINUTE. WHAT THE HELL A"M I SAYING ,BEATIFUL TROPICAL ISLAND, TAKE MY LICENCE I"LL WALK.

p.s. must be tuff, all that sun, scenery and beutiful weather must be really depressing.

p.s.s. any dealers looking for techs let me know

Hey guys, just so you know. A hypertech programmer will NOT remove you top speed limiter. It will only allow you to raise it about 10 mph. The only way to remove it is to install a JET SCU-2000. It allows transmission shift points and speedometer calibration for vehicles where tire size or gear changes are required. It also eliminates the top speed limiter in these applications. It simply plugs in to the transmission and is adjusted with the turn of a switch. It will run about $125 but well worth it.

actualy it will let you raise it 30 mph to 129 or their about since stock is arount 95

^^I have a hypertech and have had my speedo pegged out. Of course I don't have proof of it since I nearly ran off the road taking a pic of the speedo at 105 in my sig below.

Like mjgjr said there are levels at which you can set the top speed to depending on the speed rating for your tire with the Hypertech.

^^I have a hypertech and have had my speedo pegged out. Of course I don't have proof of it since I nearly ran off the road taking a pic of the speedo at 105 in my sig below.

Like mjgjr said there are levels at which you can set the top speed to depending on the speed rating for your tire with the Hypertech.

next time bring a freind, nobody really wants to die alone

Its definately more than a 10 MPH raise.

As for the guy with the supercharger. If you dont have other mods, you really arent getting the most out of your power. Especially when you have 400 HP and your shift points are stock, your throttle response is normal, and you have the 95 MPH limit. Spend some cash and get a Hypertech and a Venom Control Module. Two mods worth it if you ask me. I have less raw power than alot of people heavily modded... But my truck runs alot better than most of the guys I have raced, just because my engine responds better.

next time bring a freind, nobody really wants to die alone

Heh can't get anyone to ride with me for some reason :evillol:

Heh can't get anyone to ride with me for some reason :evillol:
maybe you shuold shower more often LOL

Very interesting..... However, this from the Hypertech FAQ Site:

The Power Programmer III, available for 1994-97 LT1 and LT4 cars and 1996-2001 Vortec Trucks, allows the user to set the top speed limit to match the speed rating of the tires that have been installed on the vehicle.

I assume this to mean that if I tell it I added on a set of Z rated tires it will allow me to set it to the max....

Because of the Whipple Supercharger computer I can only mess with the Top Speed Limiter on any given programming devise.

not sure about pp3 but the pp1 for my 2000 only went to 129 over that i think you will need a custom program

PP3 is the same it goes by tire rating and 129 is high as it goes. I seriously doubt my truck will go that fast (129) I was heading down a 6% grade coming out of the mountains when I pegged my speedo at 120 (Hey at least I'm honest) and that was pushing it with all she had downhill.

Vettibution: (writes) As for the guy with the supercharger. If you dont have other mods, you really arent getting the most out of your power. Especially when you have 400 HP and your shift points are stock, your throttle response is normal, and you have the 95 MPH limit. Spend some cash and get a Hypertech and a Venom Control Module. Two mods worth it if you ask me.

Money is not the issue here. The Whipple SuperCharger has its own computer. It runs in syn with the stock computer and assumes comand for all functions EXCEPT the Top Speed Limiter. The Installation Manual warns against altering the stock computer with the exception of the Top Speed Limiter. That will be priority number ONE!

As for mods: My '99 Silverado has had its trans, rear-end, intake, exhaust system, brakes and suspension modified. I was going to install headers, but am putting that on hold for awhile. The faulty gas gauge and a water injection system is being installed. The TSL is next! BTW: Estimated HP will be up around 450 and NO PLACE TO GO FAST. I live on an ISLAND!

Heh can't get anyone to ride with me for some reason :evillol:


lol