I have a 2001 M6 Z-28, on my way to and from G12 in Atlanta this weekend I got into a few races with some buddies that drove down with me. My car would pull hard as hell all the way to 120 Mph but would cut out and fall on it's face, felt and sounded like the rev limiter. So I put the car in 6th gear and rolled up to 120 again but with the same thing. I thought these cars weren't governed until 160 or something. Do I have a problem elsewhere causing the computer to shut the car down at 120? Any help would be appreciated.

 

Did the car come with Z rated tires? If not sounds like the speed limiter.

 

rarely will you find a z28 and m6 that is NOT equipped with Z-Rated tires...

 

mine was fully loaded but didnt hav the zrated tires gov kicked on at 112-115 tune took care of that tho

 

That's strange, the car is a Hurst equipped Loaded M6 so you'd figure it wouldn't be limited so low. My 98 Auto would pull all the way to 155mph with no problem. So I guess it's got the speed limiter set, so a tune needs to be done to remove it correct? I need to look on my window sticker and see what rating the tires are. Thanks

 

Here's what the window sticker says, P235/55 R-16 S/B Radial B/W tires.
I have the preferred equipment group package with practically every available option although I'm not sure about the tires, what does B/W mean?

 

black wall ????????

 

Z rated tires was an option on mine, and not under the preferred equipment group section - sticker says P245/50 ZR-16 S/B radial B/W tires.

 

If you got the 235 size, you usually did not get z-rated tires. My 98 brochure specifically linked z-rated minimum with 245 tires.

 

That's what it is then, mine came with the shitty 235 tire which isn't Z rated so it has the speed limiter set. I'm calling up Intune to see if I can have this re-set in my computer, kinda sucks when my car falls on it's face when it was pulling so damn hard. These cars are insane on the top end.