Maximum Top Speed
Thread Starter
Teching In
Joined: Aug 2002
Posts: 25
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From: GLASGOW, KY. 42141
Maximum Top Speed I hope that I'm posting this in the appropriate section! A discussion the other day resulted in some different opinions, what do you guys say? Is it possible to achieve maximum top speed in overdrive gears, or would you have to maintain at least a 1.1 ratio? An A4 for example: Would top speed be achieved in 3rd, [or 4th od]? 6 speed: In 4th, or [5th or 6th od's]? Please tell me what you think so this matter can be resolved! <img src="http://www.stanggang.com/smilies/smiley-faces26.gif" alt=" - " />
On The Tree
Joined: Sep 2002
Posts: 162
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From: DFW, TX
Re: Maximum Top Speed My C5 six-speed will hit top speed in 5th gear with the the factory stock 3.42 rear-end. I now have 4.10 gears and the new top-speed gear is actually 6th. I've done 174mph before I lifted with the stock gears in 5th gear. I've since done 170mph indicated on the HUD in 6th gear with the 4.10 rear-end. The rpm's were between 4000 and 4500 (couldn't get a good look). It was pretty fun. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
TECH Fanatic
Joined: Oct 2002
Posts: 1,648
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From: F.H,Waterford,Port Huron, MI
Re: Maximum Top Speed Top speed on my 01" 161mph my friends 96" corvette collector ed. is 181mph. We have tested both. Howerver I think horsepower is what matters as horsepower is what keeps the car moving and a roll and torque moves you from a stop. Or something like that?? Now of corse I have to beat my friends top speed..... <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
Re: Maximum Top Speed I hit the rev limiter in 5th (6800) with the HUD saying 182mph. I don't know how acurate the HUD was, but I magine it's within a couple of mph. I shifted to 6th and the car would pull no more. It actually slowed down. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
Staging Lane
Joined: Dec 2001
Posts: 61
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From: Lewisville, Tx
Re: Maximum Top Speed </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DTG99Z28:
<strong> Hit 150 in 4th and was still going and let off but i think it gets the best time to top speed in 4th but to maintain i would have to go to 5th. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> I don't know what you were driving but it wasn't an F-body. Even shifting at 6500 rpms with 3.42s I can only go ~136 in 4th gear. 5th gear is the top speed gear for 3.42s, not 4th. Hell even if you dropped down to 2.73 gears in a M6 you STILL couldn't hit 150 in 4th.
<strong> Hit 150 in 4th and was still going and let off but i think it gets the best time to top speed in 4th but to maintain i would have to go to 5th. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> I don't know what you were driving but it wasn't an F-body. Even shifting at 6500 rpms with 3.42s I can only go ~136 in 4th gear. 5th gear is the top speed gear for 3.42s, not 4th. Hell even if you dropped down to 2.73 gears in a M6 you STILL couldn't hit 150 in 4th.
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Re: Maximum Top Speed The guy's in the Drag section could probley help you on this top speed question <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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Re: Maximum Top Speed Technically F-body's and C5's could reach higher top speeds but the gearing is incorrect. This link shows the theoretical top speed taking into account drag and frontal area.
http://www.smokemup.com/auto_math/hp...resistance.php
According to that calculator a stock 2002 Camaro should be able to go 180-190mph with proper gearing.
http://www.smokemup.com/auto_math/hp...resistance.php
According to that calculator a stock 2002 Camaro should be able to go 180-190mph with proper gearing.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Maximum Top Speed With stock power (or even close to stock power) and stock gearing, your top speed will most definitely come in OD for an automatic whether you have 2.73, 3.15, or 3.23s (F-body A4s come with 2.73s and 3.23s while C5 A4s come with 3.15s.) It will come in 5th for an M6.
Thread Starter
Teching In
Joined: Aug 2002
Posts: 25
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From: GLASGOW, KY. 42141
Re: Maximum Top Speed </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Colonel:
<strong> With stock power (or even close to stock power) and stock gearing, your top speed will most definitely come in OD for an automatic whether you have 2.73, 3.15, or 3.23s (F-body A4s come with 2.73s and 3.23s while C5 A4s come with 3.15s.) It will come in 5th for an M6. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thank you Colonel! That's what I was looking for. That should settle this issue nicely! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<strong> With stock power (or even close to stock power) and stock gearing, your top speed will most definitely come in OD for an automatic whether you have 2.73, 3.15, or 3.23s (F-body A4s come with 2.73s and 3.23s while C5 A4s come with 3.15s.) It will come in 5th for an M6. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thank you Colonel! That's what I was looking for. That should settle this issue nicely! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Re: Maximum Top Speed there was some guy here who claimed that in his convertible camaro he did around 200mph +/- speedo, gear/tire error.
I dont know what gear tire combo he had but he had over 500rwhp due to his vortech supercharger.
my ***** have only let me get up to 150, that was on shock suspension.
one of these days ill take it to a track like mid america to see if i can get 200mph <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
I dont know what gear tire combo he had but he had over 500rwhp due to his vortech supercharger.
my ***** have only let me get up to 150, that was on shock suspension.
one of these days ill take it to a track like mid america to see if i can get 200mph <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
TECH Fanatic
Joined: Aug 2002
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From: Objects in mirror no longer matter.
Re: Maximum Top Speed </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FAST LS1:
<strong> Technically F-body's and C5's could reach higher top speeds but the gearing is incorrect. This link shows the theoretical top speed taking into account drag and frontal area.
http://www.smokemup.com/auto_math/hp...resistance.php
According to that calculator a stock 2002 Camaro should be able to go 180-190mph with proper gearing. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That calculator does not take into account frictional loss with the tires etc (the weight of the car among other things complicate the calculations). Also the horepower curve must be greater at all points in high gear than the rate at which wind drag is increasing (= .5 X velocity of the wind squared X air density X drag coefficient X frontal area) in order to actually reach your top speed at a given peak horsepower. This is why many actually slow down when shifting to sixth at redline.
<strong> Technically F-body's and C5's could reach higher top speeds but the gearing is incorrect. This link shows the theoretical top speed taking into account drag and frontal area.
http://www.smokemup.com/auto_math/hp...resistance.php
According to that calculator a stock 2002 Camaro should be able to go 180-190mph with proper gearing. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That calculator does not take into account frictional loss with the tires etc (the weight of the car among other things complicate the calculations). Also the horepower curve must be greater at all points in high gear than the rate at which wind drag is increasing (= .5 X velocity of the wind squared X air density X drag coefficient X frontal area) in order to actually reach your top speed at a given peak horsepower. This is why many actually slow down when shifting to sixth at redline.
Re: Maximum Top Speed Regardless of what differential ratio you have or what gear you are in you want your final gearing where you reach approximately peak hp for maximum speed. If you are geared where you are much over peak you will be going slower and conversely geared where you are much less than peak you will be going slower.
