MyLilWS6

My buddies 99 Z28 m6 starts to cut out and miss right when he hits 120mph.
It runs fine and pulls hard all the way up until the speedo gets to 120 and the car won't go any faster. It feels like hitting the rev limiter but worse. Is there a govener from the factory or is it somthing else? The only mods are a lid and exhaust.

Thanks guys

Z28Venom

iTrader: (13)

If he still has the stocker tires, check the speed rating on them. If the tires are Z-rated then it should top out at 160 or so.. But if he has the cheapos.. W or Y rated or something like that. Then he'll have a limiter at 118 or 119.

Which pretty much sucks ***.. Time to get either a Predator or HPP3.

The factory set the top speed of the car according to the speed rating of the tires. I believe Z-rated tires were an extra option or something.

DANSLS1GTO

How exactly does it suck *** that GM makes a car that is limited to the safe speed at which you could drive it stock? I think letting the car get up over 120 and having the tires disintegrate and all of the consequences of that would suck *** much more.
That being said - as stated any of the PCM controllers can eliminate the cutoff.
Dan

12stones

iTrader: (2)

GM is just tryin to keep him safe with lower rated tires. like another said, get hpp3 or predetor, and slap on same Z rated rubber

demonspeed

iTrader: (7)

If it doesn't have QLC in the RPO codes on the door, then it has the lower limiter. I think the Z rated limiter is 162.

99PontTA

well i'm glad yer in cali if yer drivin 120........i'm far away from the pieces of flesh that will surely be torn off your body as the car flips and rips apart from using the wrong tires!

TheBlurLS1

iTrader: (8)

my buddies 99 gt stang cut off @ 120. with his new 3.73 rear end and little bitty slicks, his car was cutting off on the 1/4 when he was actually only doing about 98 because the car thought he was still going 120. i found his speedo output and wired a simple toggal switch into one of the wires which we ran up between the console and the driver seat. at any speed, you can flip the switch and the speedo dies. he has no problems with the SES light or performance at all. it was frustrating that first night at the track though when his car was runnin better than ever but still cuttin off before the finish.

ULTIMATEORANGESS

iTrader: (4)

i always thought only 2.73 geared a4s had a factory speed limiter.



m6 ls1s are 3.42 equipped.ive never heard about them being governed before redline.

THECowboy

i'm not sure what gearing i have since i am that much of an idiot, but here on the NJ Turnpike i've hit 135 in an A4, stock

JEB99TA

iTrader: (32)

Well, I've hit 142, without realizing it, while on the Interstate ... gettin' it on with a new (390 HP) Cobra ... no traffic ... open space on both sides of the road. When I looked down at the speedo, it was a little scarey ... imediately backed off. The Superchip programmer knocked off the rev limiter successfully. Well, that was bone stock 6 months ago ... lookin' for that Cobra now. This time, it will be at the dragstrip in a controlled environment.

Nine Ball

iTrader: (38)

As others have stated, the speed limiter was dependent on the type of tires your Camaro originally came with. Cars with the GSC or RSA Goodyears came with a 162 mph limiter since the tires were Z-rated. The non-Z rated tires had a limiter at 120 mph.

You guys should have been around in '98 when we didn't have programmers or custom tuning yet. It was HILLARIOUS when guys on the net learned their brand new Z had a 120 limiter on it. I believe none of the Pontiacs had the lower limiter, as they should have all came with Z-rated tires.

Tony

PlainwhiteZ28

My stripped M6 came with the limiter, its actually at about 117 on mine


oh not after TSP tuned it out

Brandon_TA

iTrader: (1)

i dont know if theres a limiter on mine or not... Trans Am
Ive taken the needle all the way around past 155... ya, i know im crazy ... but i like to live on the edge.

BMF

Chevy should have just put Z rated tires on stock. It is a friggin sports car isn't it?

KrazyDan

[QUOTE=BMF]Chevy should have just put Z rated tires on stock. It is a friggin sports car isn't it?[/QUOTE
Its also another way for them to make more money

DO NOT take the limiter off unless you get new tires

MyLilWS6

Yea, from the factory his Z28 came with some lame Dunlop Qualifier's(sp?). He now has 18'' Z06 rims with Z rated tires.

Thanks for the help
Nick

NBM2001z28

iTrader: (43)

i've done more then 165 in mine, i used to have the factory 118 mph limiter, but speed inc's basic tune killed that. i got that tune for a good deal less then they usually charge so it was cool

demonspeed

iTrader: (7)

[QUOTE=KrazyDan]Screw just the Z rated tires... the Z28's should have come with 17x9's too. Those 16's don't cut it.

slow

iTrader: (7)

but by the time you add Z tires, and 17by9 rims, your $22,000 Z28, isnow a $24,000 Z28

Ryan

PlainwhiteZ28

I was told that it didnt matter how fast you went on the tires, but the sudden braking or force of turns at high rates of speed would peel the tread off?