Governor?

KMT15 · September 28, 2002

I have a 99 Silverado. I was on the high way early this morning and it was very quite, so I decided to see what she had. After eaily hitting 98MPH it cut back to about 93MPH. I thought there was only a governor on the 4.3L? How do I get rid of this?

-KMT15

Firetiger(MN) · September 28, 2002

Nope, there is a speedo triggered shut-down on the motors other than the 4.3. In fact, most motors have this. Including Camaros. I believe you can use a Hypertech programmer to remove this "feature".

normy01 · September 28, 2002

If your vehicle is on propane the governer does not work

Shaners · September 28, 2002

Firetiger is right. There is a speed limiter programed into your truck. It can be changed with a programmer like the HyperTech.

The reason GM does this is because your tires are only rated for speeds under 100 mph.

5.3LSilverado01 · September 28, 2002

My friends '97 4.3L S10 had a govener at 95mph, but if you turn the 4-flashers on, no govener. Very strange. That doesn't work on any of our vehicals, yea i had to try

KMT15 · September 28, 2002

What is the potential top speed for a Silverado/Tahoe with a 5.3L? Just curious.

-KMT15

OneFastSilverado · September 28, 2002

I remember reading somewhere...(I think in a magazine) that with the use of the Hypertech PP3 top speed was 126.

99silveradoz71 · September 29, 2002

Don't want to have the liability issues of people cranking it up on tires that aren't designed for it.

KMT15 · September 29, 2002

Im thinking about getting either 20' rims or 22' rims, would the low profile tires on those be sufficiant to go over 100MPH? and how much does the hypertech thing cost?

-KMT15

Shaners · September 29, 2002

The HyperTech Programmer will set you back $250-$300. It will allow you to make alot of performance changes to your motor too, along with compensating for tire size and speed limiters.

The new tires you are considering should have a speed rating on them, so you should be able to figure out the max safe speed for the tires. It will be a letter like "Z".

MountaineerTom · September 29, 2002

I remember reading somewhere...(I think in a magazine) that with the use of the Hypertech PP3 top speed was 126.

Actually, I think it's 128, but what's 2 MPH.

jd hauler · September 29, 2002

Hey shaneres, as far as the hypertech programmer, does it really help the truck make more hp or not? I see these things in every book or magazine I read, but am leary to spend $350 bucks to raise my top speed when all I do is tow. What all will it really do and how good are the changes. thanks

Shaners · September 30, 2002

Hey shaneres, as far as the hypertech programmer, does it really help the truck make more hp or not? I see these things in every book or magazine I read, but am leary to spend $350 bucks to raise my top speed when all I do is tow. What all will it really do and how good are the changes. thanks

I really don't have the the answer. I personally don't have one and like you I have only read about them.

I've seen claims of close to 40 HP increase on the 6.0L with the Hypertech and premium fuel. I find that a little extreme, but I bet 30 HP isn't out of the question.

The charts I've seen, show a very parallel HP/torque curve which is a good thing!!! High HP/Torque numbers mean nothing to me in real world towing/driving... I need to keep the big numbers down low...

The Escalade is making 345? HP on premium fuel with a different cam and some different mapping, so that is why I think a stock 6.0L should be able to achieve 330 HP with the Hypertech. Please keep in mind that this is just my speculation though...

MountaineerTom · September 30, 2002

I don't have one either, but I think all the power tuning is done under full throttle driving. Under part throttle, which I would consider normal daily driving, no extra HP/Torque gains are made. Other features such as tire size adjustments, top speed limiter, shift firmness is still there under normal drining.

That's the way I understood it from reading info on the Hypertech website. Can anyone that has one confirm this?

CapnDean · September 30, 2002

IMHO

Avoid the hypertech chip UNLESS you are taking your truck to the track.

As noted before...the majority of the performance gains occur at the extreme ends of performance range and will likely be less than noticeable in the daily driver end of the spectrum.

That being said you will increase the chance of engine ping/spark knock/valve rattle...likely have to pony up for the premium gas etc...

Most all of the chips advance the base timing into the ping zone anyway. {Granted that optimum performance comes at the bitter edge of detonation}.

Just my 2 cents...