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Old 10-14-2011, 06:59 PM   #1
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Scott (Fbodfather), what say you...

Will the ZL1 have an electronically limited top speed in production models? I would assume yes, but would like your input.
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Old 10-14-2011, 07:57 PM   #2
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I'm not Scott or know what he knows but it would be safe to assume that the auto will cut out at 175 and the manual should not have a limiter. This is based off of the CTS-V.
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Old 10-14-2011, 07:59 PM   #3
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I'm not Scott or know what he knows but it would be safe to assume that the auto will cut out at 175 and the manual should not have a limiter. This is based off of the CTS-V.
I'd say this is a sound guess.

And I'll also add that I think this might fall under the "details that have not been revealed yet"
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Old 10-14-2011, 08:06 PM   #4
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True. I was not asking what that limit might be, simply if there was going to be one. I didn't think that would be any sort of secret to reveal.
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Old 10-14-2011, 08:12 PM   #5
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True. I was not asking what that limit might be, simply if there was going to be one. I didn't think that would be any sort of secret to reveal.
You'd be surprised what they might consider a secret.

Consider this...fwiw....factory-spec powertrain ZL1 was able to reach 174 on the straight portion of Nurburgring Nordschiefe.
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Old 10-15-2011, 03:21 AM   #6
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(had to be said)
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Old 10-15-2011, 06:26 AM   #7
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My guess is it will be limited to the speed rating of the tires, just like any car. They have to limit their liability if a tire fails.
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Old 10-15-2011, 06:35 AM   #8
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You'd be surprised what they might consider a secret.

Consider this...fwiw....factory-spec powertrain ZL1 was able to reach 174 on the straight portion of Nurburgring Nordschiefe.
173 according to the video
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Old 10-15-2011, 06:58 AM   #9
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My guess is it will be limited to the speed rating of the tires, just like any car. They have to limit their liability if a tire fails.
Correct... but that doesn't hold true to the SS which is limited at 155 by the factory...

The tire is a ZR20 106Y - this means that the tire is a Z rated tire, meaning the top speed is in excess of 149 mph. The 106 is the load rating... but the most important number is the Y. This is the top speed the tire was tested at in excess of 149 mph. A Y rated tire is good to a verified test speed of 186 mph. I am wondering what super cars have as tires or... Y is the last rating, up to 186 and we know a good number of cars exceed that number. I do not expect the ZL1 to break 186 mph due to aerodynamics and weight.

Not sure why they limited the SS 30 mph below the tire rating...
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Old 10-15-2011, 12:45 PM   #10
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It would not make sense to limit the ZL1
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Old 10-15-2011, 12:52 PM   #11
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What is the tire rating of the CTS-V? Seems to me that is a good car to base guesses on, since it has basicallly the same drivetrain.
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Old 10-15-2011, 01:10 PM   #12
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sucks that they will limit me to 186 on Iowa roads WTF!!!!
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Old 10-15-2011, 07:54 PM   #13
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Quote:
Originally Posted by Road Rage View Post
173 according to the video
Good catch...I dunno where I got "4" from...hmm..

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Originally Posted by IROCanSS View Post
I do not expect the ZL1 to break 186 mph due to aerodynamics and weight.
CTS-V is said to have a theoretical top speed of 191mph. I think the ZL1 will 'theoretically' be able to exceed that...

Not sure why they limited the SS 30 mph below the tire rating...
If I were to make a guess....I'd say it's limited based on high-speed stability/price...a 1SS is so attainable...as a manufacturer, I'd be seriously concerned that most drivers would try to reach that speed. And perhaps the SS isn't all that stable at speeds of 155+...all guesses on my part.
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Old 10-15-2011, 10:09 PM   #14
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Originally Posted by IROCanSS View Post
Correct... but that doesn't hold true to the SS which is limited at 155 by the factory...

The tire is a ZR20 106Y - this means that the tire is a Z rated tire, meaning the top speed is in excess of 149 mph. The 106 is the load rating... but the most important number is the Y. This is the top speed the tire was tested at in excess of 149 mph. A Y rated tire is good to a verified test speed of 186 mph. I am wondering what super cars have as tires or... Y is the last rating, up to 186 and we know a good number of cars exceed that number. I do not expect the ZL1 to break 186 mph due to aerodynamics and weight.

Not sure why they limited the SS 30 mph below the tire rating...
Great info again IROCanSS Well, the last letter in the alphabet is Z. Hopefully someone can provide an answer to your question so that we all may understand the tire ratings for speed beyond 186. As a side note <sarcasim alert> I would like to add that Scarrzz has two ZZ's in his name, and he's already done 186 on two wheels <dude's got some brass ones dosen't he?LOL> That measily 'ol 186 number on four tires ain't didly compared to two. We'll get an answer soon. There are those pushing the envelope who will quickly exceed the factory "limitations". I for one will not, but am willing to ride shotgun...heh-heh...
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sucks that they will limit me to 186 on Iowa roads WTF!!!!
....now that's funny!
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Old 10-15-2011, 11:12 PM   #15
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Originally Posted by IROCanSS View Post
Correct... but that doesn't hold true to the SS which is limited at 155 by the factory...

The tire is a ZR20 106Y - this means that the tire is a Z rated tire, meaning the top speed is in excess of 149 mph. The 106 is the load rating... but the most important number is the Y. This is the top speed the tire was tested at in excess of 149 mph. A Y rated tire is good to a verified test speed of 186 mph. I am wondering what super cars have as tires or... Y is the last rating, up to 186 and we know a good number of cars exceed that number. I do not expect the ZL1 to break 186 mph due to aerodynamics and weight.

Not sure why they limited the SS 30 mph below the tire rating...
Its like the sky rides at san diego zoo or sea world. Rated to 400lbs but can actually handle 600lbs. Its just a way of not taking risk, cause if I built a swing to 150 lbs but I know it can handle 200lbs. If they are 200lbs and break the swing, it is not my fault at all because the warning said the max and they pushed it. So if they know the tires can handle 30mph more, why not take a precaution and rate it a little lower and save your a^$
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Old 10-15-2011, 11:23 PM   #16
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Originally Posted by IROCanSS View Post
The tire is a ZR20 106Y - this means that the tire is a Z rated tire, meaning the top speed is in excess of 149 mph. The 106 is the load rating... but the most important number is the Y.
From looking at the pictures of the tires on the ZL1 convertible where I've been able to see the tire rating, I think that the load rating is 100, and not 106. Save the attached image of the ZL1 convertible, and check out the the tire rating of the front left tire.
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Old 10-15-2011, 11:31 PM   #17
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And I'll also add that I think this might fall under the "details that have not been revealed yet"

bingo -- we have a winnahhhh...............





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Old 10-16-2011, 01:51 AM   #18
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I do not expect the ZL1 to break 186 mph due to aerodynamics and weight.
Weight has very little to do with top speed; it's almost all aerodynamics that dictate top speed.
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Old 10-16-2011, 02:03 AM   #19
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bingo -- we have a winnahhhh...............





all in due time - all in due time............

Doesn't GM realize ....We aint got time to wait!

I'm going hunting for 2 weeks in Nov....2nd and 3rd week! I wanna have my car ordered and paid for by then! Don't wanna miss the boat!
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Old 10-17-2011, 11:16 AM   #20
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Weight has very little to do with top speed; it's almost all aerodynamics that dictate top speed.
I think I read somewhere that past 100 mph weight doesn't play much of an issue. As you said, aerodynamics are key.
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Old 10-17-2011, 12:20 PM   #21
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Mr. Link wasn't even going full throttle down the back straight in that video, so I bet if you get ZL1 on a straight, flat, smooth surface, mid-180s will be easy. After the video at the 'Ring, my initial guess might be too conservative
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Old 10-17-2011, 04:19 PM   #22
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Mr. Link wasn't even going full throttle down the back straight in that video, so I bet if you get ZL1 on a straight, flat, smooth surface, mid-180s will be easy. After the video at the 'Ring, my initial guess might be too conservative
Not so sure about that... he was doing all the RPM's the car was rated for....
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Old 10-17-2011, 04:25 PM   #23
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Mr. Link wasn't even going full throttle down the back straight in that video, so I bet if you get ZL1 on a straight, flat, smooth surface, mid-180s will be easy. After the video at the 'Ring, my initial guess might be too conservative
HAHAAHA.... I'm afraid at 180 a bird might drop a splatter bomb on my windsheild and without my fire suit and helmet and roll cage, I'd be a goner!!

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Old 10-17-2011, 04:44 PM   #24
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Not so sure about that... he was doing all the RPM's the car was rated for....
If the telemetry was accurate, going down that straight, the G'dots should've been a deep green color. Some of that time it was blue or black, indicating little throttle input; if he were on the brakes, the dots would be red. Have another look at the video and run and pay particular attention I don't know if the car would've been controlable going faster - I'm just saying he was WOT the whole time.

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HAHAAHA.... I'm afraid at 180 a bird might drop a splatter bomb on my windsheild and without my fire suit and helmet and roll cage, I'd be a goner!!

Icky...
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Old 10-17-2011, 04:48 PM   #25
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If the telemetry was accurate, going down that straight, the G'dots should've been a deep green color. Some of that time it was blue or black, indicating little throttle input; if he were on the brakes, the dots would be red. Have another look at the video and run and pay particular attention I don't know if the car would've been controlable going faster - I'm just saying he was WOT the whole time.



Icky...
Valid point... but go back and notice the RPM's at what MPH was it?
171 MPH?
Clearly indicates a pretty much WOT condition.... OR at least to a point anything more and it would be either floating valves or slinging a few.... Yeah, lets see if we can blow this puppy up ON camera.....
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