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.