SPEED LIMIT??

This afternoon I was driving on the highway and for the first time I tried to reach the H3 max speed.

BUT, when I reached the 100 mph line the engine abruptly stopped ( ignition cut off )... and re started again just below the 100 mark!!

is there a speed limiter built in or is just my car?

if there is one, does anyone know how to by pass it

I've never heard of that..Call your dealer and ask them..very interesting!

A lot of vehicles now have speed limiters in their computers to prevent tire failure liability, but they just limit throttle setting. Shutting the engine off and restarting at high speed could, IMO, be a dangerous process. It would be surprising to me if GM programmed it that way.

When my PCM was reprogrammed, the speed limiter was removed. (Limiter originally set at around 100mph.)

I had the feeling that the engine stopped in fact it just lost power until I was just below 100mph and started again normally.

I then remain just below the 100 mark for 1 or 2 minutes without any vibration or problems, the engine was doing 3200 rpm.

my usual speed is about 85/95 on the highway the engine does 2850/3000 rpm at that speed.
never had a problem not even a small vibration and the car has already 5000 miles after less than 60 days since I bought it.

one of my friend has a Grand Cherokee 5.7 hemi, he does have a limiter but when he hits the 110+ mph.
could that be a trick from GM Europe?

I think they are capped at 96 or 98 mph ... I'm rather surprised it would cut the ignition off though .. all off a sudden no power brakes, no power stearing .. Are you sure it didn't just cut fuel delivery to bring you down under the cap/governor? I had this very same thing happen to me in my old Avalanche before I had said cap removed ... I was told at that time this is what happens ...

Pretty sure it's 96MPH.

My '96 Blazer shut off the fuel at 96. I discovered it when coming home from Ole Miss one day, haulin down I-55. I did it again just to make sure. And sure enough, 96MPH was the magic number.

I know people the went past a hundred on a h3

Yes, GM usually sets it's vehicles to shut off at 100 mph. And yes it shuts off, but restarts the moment it drops back below that number. I would have to assume that the H3 is the same, but don't know for sure. Becuase it shuts off right at 100, and restarts right away once under 100, it's usually not going to be a problem. The powerless experience should only last a second or so, so I doubt there is any real danger. I would rather it not did it, but I'm not the chief designer at GM. Most re-programers usually have an option to raise the limter speed, or do away with it completely.

Hi,

I am going to the dealer tomorrow morning first time!!

I want this limiter removed, the car can do 110 being still below 4000 rpm.

i keep you posted.

It is actually 98mph. Im pretty sure GM has electronically limited (with a fuel shutoff) all trucks and suv's at least since I had a '97 S-10

Thanks for the info,

I can understand Mercedes and BMW having a limiter programmed at 155 mph but 98!!!

the H3 can do much better than that and still remain very safe. I shall have this limiter removed and find out what this car is upto.

any idea about the best way to take it off??

I saw a Range Rover roll several times at 90-100 mph on the I-5 a few years ago. The guy had just passed me in my Montero seconds before. I was going about 75 and he went by me like was standing still. It was straight and dry too. Since seeing that, I have no urge to go anywhere near 100 in any SUV, especially one with big squishy 33s.

JM, yes, there is a speed limiter on the H3 and it is set at 100 miles an hour! A buddy of mine has a friend that tried it on his H3 and his did the same thing when he reached 100 on the speedometer.

I just installed (today) a PCMforless and had the speed limiter taken out. I just may try it to see what happens!

quote:

ORIGINAL: JM
the H3 can do much better than that and still remain very safe. I shall have this limiter removed and find out what this car is upto.

any idea about the best way to take it off??

Good luck with that.

I can already tell you that the dealer isn't going to take it off for any reason you can come up with. (unless of course you get some shady service tech to do it for you, without the managments knowledge.) Where are you driving 100 mph at anyway? I'm not sure how I feel about them putting the limiter on there.... but, at the same time, I'm uneffected by it because I have no need to drive 100 plus mph.

If you're driving that fast, and have a wreck and kill someones family, you had better pray to whomever you believe in, that it's not mine.

Some of us have had PCMforless reprogram our computers. Cost is $149.00. Best bucks that I have spent for a mod. They will remove the limiter (if you want). I don't like the idea of a speed limiter (and had it removed), but I don't plan to test the truck to see if they indeed removed it.

Much more importantly, they made several 'individualized' performance (and preference) tunes. For instance, I tow a 3500# boat occasionally and they took that into consideration. There are a couple of lengthy threads on the topic.

PCM reprogram is highly recommended...

Sounds about right to me from what I've heard ... Cutting the ignition would be a safety hazzard, fuel on the other hand ... Man, these are the things that makes me miss the SRT-10, no cap ...

quote:

ORIGINAL: ZYNE
Man, these are the things that makes me miss the SRT-10, no cap ...

Well I recon so, with one of these bad boys under the bonnet....Must of been a screamer

Didn't know we have autobahn here in North America.

Speed limits are there for a reason.

If I'm not mistaken, JM is in France..I'm not sure what the speed laws are there but its a whole lot closer to the autobahn than I am.

Doh! I guess St. Tropez' in France a'ight.

Viva Le France!

Those damn French drive like crazy Brits n e ways.

quote:

ORIGINAL: Ghostrider

If I'm not mistaken, JM is in France..I'm not sure what the speed laws are there but its a whole lot closer to the autobahn than I am.

Ahhh..

Still a crazy thing to do (run that speed for those distances) with any type of off road tire. I don't even want to think of the heat they would start to generate after a while at those speeds. After a while of that, sooner or later ones going to fail, more than likely. They were never intended to for that level of performance.

Hi, fireman.

I understand your point and partially agree with it.
but,

first of all, where I live we have a lot of highway without speed limit so I am not doing anything against the law,
second speed in itself is NOT dangerous, the way someone drive is, thus when I am driving fast I make sure that I am not endengering anyone else safety,
third I have been lucky enough to own all sort of exotic very fast cars so I am used to drive fast on long distances without loosing my concentration.

last, you Americans are having these very low speed limits for years and are trained to drive in between, let say, 50 and 70 mph, your cars and most of your roads are built with this parameter in mind that's why I partially agree with you.

We, in Europe are used and trained to drive faster and most of our highways and some of our cars are safer driving 120 mph than yours driving 70.

make no mistake, I am not saying that our cars, our highways or our driving are better. The legal and technical approaches are just different.

in any event, one has to adjust his driving to his own hability and to the external factors surrounding his car by doing that you drive safely for you and for the others.

Obviously all the above is pure theory applicable on a case to case basis, limiters are made for the average driver turning ''amok'' on a friday evening.... for that reason I am not against limiters.... but really, do you believe that an accident is less serious driving 98 mph instead of 105?

BTW, I am driving since 32 years and never got a speed ticket, let alone a car accident (thanks God!)

Ahhh..

Still a crazy thing to do (run that speed for those distances) with any type of off road tire. I don't even want to think of the heat they would start to generate after a while at those speeds. After a while of that, sooner or later ones going to fail, more than likely. They were never intended to for that level of performance.
[/quote]

Wrong !

my tires are labelled ''T'' they are built for speed upto 113 mph sustainable for 8 consecutive hours (so the manufacturer - MICHELIN- says).

H3 top speed - without limiter- is 111 mph and I have no intention to drive that fast for 8 consecutive hours, thus I am well below the limits.

you have to keep them at 35 psi or 40 if you're heavily loaded and then NO PROBLEMO

I do not agree about the GM speeed limiter, i went 115 in my trailbalzer a few times in AZ