not really.... and im not the only one to mention it. and unless you can radar prove that you can hit 155 in a stock cobalt, it isnt happening. The speedometer is off.

 

What makes you think it cant? Maybe we are doing more if the speedo is off? Saying it cant do 155 when we already have a couple of member that surpased that is kinda ignorant.

 

ok, I will

lets review you previous post

um...you do argue a lot. No need to rehash this.
I have a GPS unit that says I have gone faster than 155. How wrong are GPS units?
Z rated tires are rated at 168
Y rated tires are rated at 189
States do limit how fast cars go, its called a speed limit. Its up to the individual to obey the laws imposed by the state. Consequences follow for not doing so.
The gearing of said corvette would be the same no matter where you buy it. Think GM will custom make a set of gears for 1 state, I doubt it.

An FYI while on the dyno my car hit 155 in 4th gear. Granted, this wasn't on the street, the car is more than capable of doing speeds in excess of 150.
I honestly love hearing all the 'internet experts' explain what a person can and cannot do with the cars.

 

Yeah the Cobalt can go up to 318mph. But with the stock tune and Stage Kits, Zinner is right. The car is set to cutoff at 158mph and resume at 155mph. That is what the video of Darksun shows.

 

z rated tires are rated for 149+, they dont say the top limit. thats why they started putting 2 letters on them. i think y's are 189 and w's are 168. they do road races out in west texas too... lots of 200mph+ cars. then theres the silver state classic road race and several others.

 

 

You're right on that, my old age is starting to affect me and for some reason I was thinking the cutoff was 138, when it's 143. My bad.

 

Doc, while you're usually right about a lot of things, Z-rated tires are actually 149+. When they first hit the market, they were thought to be as fast a tire as anyone would ever need. As cars got faster, people wanted to know exactly *how* much over 149 they could go. Hence the introduction of W (168 mph) and Y (186 mph) tires, both of which are also Z-rated.

And to get to 155 in 4th, you've got to be spinning the engine at 7600 rpm, or have some insanely large tires. (you are running 20s though, aren't you, so I guess it's not out of the question!)

The car is geared to hit 143 in 4th at 7k rpm, on the stock tire size, and I'm pretty sure that's something that doesn't vary from car to car.

 

First of all, for the corvette thing it wasnt supposed to be a REAL thing, it was a "it would be funny if" thing.... No **** they wouldnt change the gears for one state.....

Second, You are modified and I said NOTHING about modified cars. I said Stock cars with STOCK PCMs. And GPS units are not 100% correct. If they were, they wouldnt say that they are only accurate within 3 meters.

Third, I didnt say that Z rated was exactly 189, I said it was somewhere around there. My argument was that cars are limited to the rating of their tires. Why do you think most cars are limited at 107?

Fourth, nobody said anything about how fast a car can go on a dyno. That information is useless in this argument.

 

If u read his post a little more clearly, it was 10-15 seconds to get from 150 to 155.... not to 155

 

I've hit only 145 with just an exhaust. It would not go any faster than that. I was only around the low 5000 rpm range. But let me tell you, I will never do taht again. That's a little on the fast side for me.

 

chipmonk212121 just keep digging your hole buddy.

 

Heres the gold star you've earned

 

actually not really, if he says he went 155mph in 4th on a dyno it means that there was no govenor limiting him to 140mph...

 

i never said anything about a govenor limiting anyone to 140. and he wasnt stock anyway. The cars gearing alone with the STOCK PCM limiting it at 6500 wont go 155.

 

ya someone already told me that. I though he said 10-15 seconds to go 0-155.

 

Thanks
I actually had the 20's on when it went to 155 in 4th and the speed came off the dyno not the speedo.

no kidding, he just gave a excuses rather than owning up about his post...

 

**** it, Im just gonna stop arguing. If I dont stop, nobody else will..... I know im not gonna say im wrong and neither will anyone else. Its a free country, you can believe what you want and I can believe what I want.

 

Look, with all that has been said in this thread can anyone tell me why my car will only do 140mph stock and modified with a Injen CAI? The CAI made very little differance in 1st and 2nd, but car does pull harder in 3rd and 4th. Still will not go faster than 140mph though. Did everycar come with 4.08 gears from factory, cause mabey that is why? I'm not really sure. Not try to star any problems with people, just really want to know why car will only do 140mph. I've seen the pics of others speedo's showing over 150mph, just wonder why my car is differant?

 

Like they said before your elevation has thinner air and is robbing your horsepower.

 

Take a trip to Phoenix this winter and find an open road, and I guarantee you'll go faster than 140.

 

But even with the thinner air the CAI incresed my HP and gave me better airflow, my car still tops our at 140mph. I could be wrong, but shouldnt the CAI at least increased my top speed 2 or 3mph?

 

the thinner air robs more HP that your Injen gains. Example. (not real numbers)
if your car has 205 stock and that thinner air robs 15hp while your injen gains 5. you are still at 195. Im sure someone else can explain it more in depth. but its something along the lines of that.

 

Will do, I've driven from Vegas to Phoenix many times, but not in my new Cobalt. It would be fun, long desert straght aways, and lots of mountain curves. I have freinds who live there. It would be fun to get some pics of my car on the hoover dam. Probaly actully be going this fall though. Hope car will hit 140mph by then, but I will let you know. Probally be the last trip in the Cobalt though, Going to trade it in on the Soltice GXP next Spring.

 

Nice! Getting that car over 140 shouldn't be an issue at all. Either way, post up when you make your trip. It'll give us Phoenix guys a reason to go do something.