Top Speed?
Thread Starter
Burning Brakes
Joined: Feb 2000
Posts: 919
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From: Nashville Tennessee
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Top Speed?
Ok, here's a hypothetical for ya:
Does the stock Coupe or the stock ZO6 have a higher top speed?
Premise: The rear axle ratio on the ZO6 is 3.42:1 and the coeffecient of drag is .31.
The rear axle ratio on the Coupe is 2.73:1 with a coeffecient of drag of .29
According to Chevrolet, the top speed of the ZO6 is 171.
The Coupe's top speed, again, according to Chevrolet, is 175.
Whatcha' think?
:confused:
Wanna race? :D
Does the stock Coupe or the stock ZO6 have a higher top speed?
Premise: The rear axle ratio on the ZO6 is 3.42:1 and the coeffecient of drag is .31.
The rear axle ratio on the Coupe is 2.73:1 with a coeffecient of drag of .29
According to Chevrolet, the top speed of the ZO6 is 171.
The Coupe's top speed, again, according to Chevrolet, is 175.
Whatcha' think?
:confused:
Wanna race? :D
Drifting
Joined: Apr 2001
Posts: 1,773
Likes: 0
From: Norman Oklahoma
Re: Top Speed? (decay)
I just recently did a run up to 170 with a 02 Z06 at the same time. We were about even from what I could tell but he started in front of me and I wasn't really paying attention to him. Granted his car is stock and I have a few mods (I also have 3.15s not 2.73s) We both ran out of room at about the same time and both got to around 170. I don't know if that helps any :cheers:
Jerry
Jerry
Burning Brakes
Joined: Oct 2000
Posts: 1,094
Likes: 2
From: Seattle suburb wa
Re: Top Speed? (decay)
actually, the factory quoted Z06 top speed is at red line not rev limit, and since a stock Z06 can achieve revlimit in 5th gear, the actual top speed of a Z06 is an identical 175/176 mph, same as a 3.42 M6 coupe. the coupe can not reach redline, much less revlimit in 5th, it's drag limited at about 5725 rpm, which is 175 mph, as GM quotes.
BTW - the slowest C5 is an auto 2.73, which will only do bout 170, it has a harder time pulling it's slightly lower 4th (compared to M6 fifth ratio) into the wind, and tops out earlier, even with it's superior drag coefficient (compared to the frc body).
the auto 3.15's supposedly will get the same buck seventy five as the stock 6 speeds. The 99/00 FRC's supposedly had a 2 mph or so top end disadvantage to the 6 speed coupes due to their worse cd..
they say, but I've seen no data, that the 01 and especially 02 coupes, both M and A, are good for a lil more than the older ones due to more power. more power damnit, Scotty more power! I'm nota magican captain, that's all she'll take...
so bottom line, the absolute slowest c5, in every category, would be a 97/98 A4 2.73 car :)
BTW - the slowest C5 is an auto 2.73, which will only do bout 170, it has a harder time pulling it's slightly lower 4th (compared to M6 fifth ratio) into the wind, and tops out earlier, even with it's superior drag coefficient (compared to the frc body).
the auto 3.15's supposedly will get the same buck seventy five as the stock 6 speeds. The 99/00 FRC's supposedly had a 2 mph or so top end disadvantage to the 6 speed coupes due to their worse cd..
they say, but I've seen no data, that the 01 and especially 02 coupes, both M and A, are good for a lil more than the older ones due to more power. more power damnit, Scotty more power! I'm nota magican captain, that's all she'll take...
so bottom line, the absolute slowest c5, in every category, would be a 97/98 A4 2.73 car :)
Melting Slicks
Joined: Feb 2001
Posts: 2,137
Likes: 1
From: Oklahoma City OK
Cruise-In III Veteran
Re: Top Speed? (99 Corvette)
If you use a spread sheet to calc the top speed at 6600 rpm rev-limit (5th gear) on the Z06, it is 177.7mph. Actual tire circumference can make a few mph difference.
The 02 Z06 that 99 Corvette was following only went to 6300 rpm on that run (169.6mph) because I, er, ah, I mean't to say the guy that was driving that car didn't want to hit rev-limit. :blueangel:
[Modified by FRISKY, 10:40 AM 4/13/2002]
The 02 Z06 that 99 Corvette was following only went to 6300 rpm on that run (169.6mph) because I, er, ah, I mean't to say the guy that was driving that car didn't want to hit rev-limit. :blueangel:
[Modified by FRISKY, 10:40 AM 4/13/2002]
Burning Brakes
Joined: Oct 2000
Posts: 1,094
Likes: 2
From: Seattle suburb wa
Re: Top Speed? (FRISKY)
If you use a spread sheet to calc the top speed at 6600 rpm rev-limit (5th gear) on the Z06, it is 177.7mph.
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Racer
Joined: Oct 2001
Posts: 336
Likes: 0
From: WTR TX
Re: Top Speed? (decay)
Ok, here's a hypothetical for ya:
Does the stock Coupe or the stock ZO6 have a higher top speed?
Premise: The rear axle ratio on the ZO6 is 3.42:1 and the coeffecient of drag is .31.
The rear axle ratio on the Coupe is 2.73:1 with a coeffecient of drag of .29
According to Chevrolet, the top speed of the ZO6 is 171.
The Coupe's top speed, again, according to Chevrolet, is 175.
Whatcha' think?
:confused:
Wanna race? :D
Does the stock Coupe or the stock ZO6 have a higher top speed?
Premise: The rear axle ratio on the ZO6 is 3.42:1 and the coeffecient of drag is .31.
The rear axle ratio on the Coupe is 2.73:1 with a coeffecient of drag of .29
According to Chevrolet, the top speed of the ZO6 is 171.
The Coupe's top speed, again, according to Chevrolet, is 175.
Whatcha' think?
:confused:
Wanna race? :D
Hope this helps..
Melting Slicks
Joined: Feb 2001
Posts: 2,137
Likes: 1
From: Oklahoma City OK
Cruise-In III Veteran
Re: Top Speed? (no cure)
No, I am using the actual roll-out measurement of a new tire as measured on the ground. Also, in the real world I have been over 174 mph many times.
And before you say my speedometer is off, I had that checked when I dynoed the car and it is off less than 1 mph at 200 mph.
And before you say my speedometer is off, I had that checked when I dynoed the car and it is off less than 1 mph at 200 mph.
Drifting
Joined: Jul 2000
Posts: 1,289
Likes: 0
From: Newport Beach, CA, USA
Re: Top Speed? (no cure)
No Cure:
In the last dyno of my car it was SAE 502rwhp and 491rwtrq through cats and mufflers. The car is on street tires with stock gears. Is this enough to calculate top speed?
The above numbers were with a 229 cam. To improve idle, etc. I am currently in the process of "camming down" just a bit. What would top speed be if power went to SAE 485rwhp/rwtrq?
Thanks!
PS: On the roadcourses I have been to, no one exceeds 160mph or so.
In the last dyno of my car it was SAE 502rwhp and 491rwtrq through cats and mufflers. The car is on street tires with stock gears. Is this enough to calculate top speed?
The above numbers were with a 229 cam. To improve idle, etc. I am currently in the process of "camming down" just a bit. What would top speed be if power went to SAE 485rwhp/rwtrq?
Thanks!
PS: On the roadcourses I have been to, no one exceeds 160mph or so.
Burning Brakes
Joined: Oct 2000
Posts: 1,094
Likes: 2
From: Seattle suburb wa
Re: Top Speed? (Mako)
Mako,
hp/tq does not come into play for speed in gears calcs until overcoming wind resistance matters, which for M6 C5's is in 5th gear.
what's needed is tire height in inches, transmission gear ratio, rear axle ratio, engine rpm, so your not including your rev limit means I can't answer your question. I assume you have a raised rev limit. 502 thru cats/muffs is awesome, you have some beast.
which tracks can you get 160?
shiny side up
David
hp/tq does not come into play for speed in gears calcs until overcoming wind resistance matters, which for M6 C5's is in 5th gear.
what's needed is tire height in inches, transmission gear ratio, rear axle ratio, engine rpm, so your not including your rev limit means I can't answer your question. I assume you have a raised rev limit. 502 thru cats/muffs is awesome, you have some beast.
which tracks can you get 160?
shiny side up
David
Racer
Joined: Feb 2002
Posts: 299
Likes: 0
Re: Top Speed? (decay)
I'd posted a thread several weeks ago about the R&T March issue which did a shootout between the Z06, 911 and NSX. One of the things I remember about the article (and I can dig it up again if anyone's interested) is what mph numbers they achieved at redline. I distinctly remember the Z06 hitting redline at 170 in 5th gear, and R&T had "estimated" top speed @ 171.
And honestly, for those of us who have been up in that speed range with six speeds, 6th really doesn't feel like the other 5 in the "pull" department. I've always been curious why it felt like 6th really was just a "coasting" gear rather than a gear that you can really use to accelerate much. Anyone else have a 6th that acts that way?
And honestly, for those of us who have been up in that speed range with six speeds, 6th really doesn't feel like the other 5 in the "pull" department. I've always been curious why it felt like 6th really was just a "coasting" gear rather than a gear that you can really use to accelerate much. Anyone else have a 6th that acts that way?
Race Director
Joined: Mar 2001
Posts: 14,480
Likes: 132
From: PA
Re: Top Speed? (Gunny)
And honestly, for those of us who have been up in that speed range with six speeds, 6th really doesn't feel like the other 5 in the "pull" department. I've always been curious why it felt like 6th really was just a "coasting" gear rather than a gear that you can really use to accelerate much. Anyone else have a 6th that acts that way?
Racer
Joined: Oct 2001
Posts: 336
Likes: 0
From: WTR TX
Re: Top Speed? (Gunny)
I'd posted a thread several weeks ago about the R&T March issue which did a shootout between the Z06, 911 and NSX. One of the things I remember about the article (and I can dig it up again if anyone's interested) is what mph numbers they achieved at redline. I distinctly remember the Z06 hitting redline at 170 in 5th gear, and R&T had "estimated" top speed @ 171.
And honestly, for those of us who have been up in that speed range with six speeds, 6th really doesn't feel like the other 5 in the "pull" department. I've always been curious why it felt like 6th really was just a "coasting" gear rather than a gear that you can really use to accelerate much. Anyone else have a 6th that acts that way?
And honestly, for those of us who have been up in that speed range with six speeds, 6th really doesn't feel like the other 5 in the "pull" department. I've always been curious why it felt like 6th really was just a "coasting" gear rather than a gear that you can really use to accelerate much. Anyone else have a 6th that acts that way?
[Modified by 96GTS, 10:59 PM 4/11/2002]
Melting Slicks
Joined: Jun 2000
Posts: 2,221
Likes: 0
From: Los Angeles CA
Re: Top Speed? (QuickSilver97)
We all do. The 6th gear is an overdrive gear. Top speed is achieved in 5th gear in all of our 6 speed cars.
-Adam
Drifting
Joined: Jul 2000
Posts: 1,289
Likes: 0
From: Newport Beach, CA, USA
Re: Top Speed? (no cure)
No Cure:
Sorry about omission of the rev. limiter: the new limit is a safe 6800. I think top speed in this car will be in 6th gear. It will not max out 6th, but should go a ways up 6th before running out of ponies!
Please calculate it for both iterations of power (i.e., SAE 502 and 485).
Thanks for the use of your brain!
Sorry about omission of the rev. limiter: the new limit is a safe 6800. I think top speed in this car will be in 6th gear. It will not max out 6th, but should go a ways up 6th before running out of ponies!
Please calculate it for both iterations of power (i.e., SAE 502 and 485).
Thanks for the use of your brain!
Racer
Joined: Jul 2001
Posts: 446
Likes: 0
From: San Antonio tx
Re: Top Speed? (Mako)
My A4 with 2.73's has seen 172, with very little mods (in sig) and without the use of the N20. It still had a little more pull, maybe enough to hit 175. I was at about 58-5900 rpm.
Daren
Daren
Melting Slicks
Joined: Aug 2000
Posts: 2,303
Likes: 154
From: Green Bay WI
Re: Top Speed? (MRR2)
Even the Twin Turbo that Motor Trend tested would not pull 6th gear. Top speed of 226 was achived in 5th. :chevy
MRR
MRR