How Fast?
Thread Starter
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
How Fast?
A Vette traveling at 5500 RPM`s in 4th driving into a 4.11 gear with rear tires of 235-60R-15`s would be going how fast? No its not a trick, I just wanterd to know the approximate speed it was traveling. Any idea? 120, 125, I dont have a clue. 
Le Mans Master
Joined: Apr 2005
Posts: 6,335
Likes: 416
From: Seattle Area WA
Here is a calculator, but you need some more numbers to calculate it, Transmission gear ratio and tire diameter.
http://wahiduddin.net/calc/calc_speed_rpm.htm
http://wahiduddin.net/calc/calc_speed_rpm.htm
Drifting
Joined: Jan 2008
Posts: 1,962
Likes: 5
From: Schererville IN
207.8 mph 
That was fun! any more????
no wait! that can't be right?? Well that's what that link says???
LOL-trick website-it asks for "Tire RADIUS"-not diameter!
That was fun! any more????
no wait! that can't be right?? Well that's what that link says???
LOL-trick website-it asks for "Tire RADIUS"-not diameter!
Last edited by blckslvr79; Feb 21, 2008 at 01:50 PM.
Drifting
Joined: Jan 2008
Posts: 1,962
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From: Schererville IN
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Thread Starter
Race Director
Joined: Nov 2002
Posts: 12,142
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From: Taylor Michigan
Thanks Gentlemen,
I didn`t have a clue but I guess the buck O fore [104} sounds about right.
The trans is a M21 but high is 1-1 anyway right?
This was not a 1/4 time, just stood on it for a moment ot two.
The trans is a M21 but high is 1-1 anyway right?
This was not a 1/4 time, just stood on it for a moment ot two.
Race Director
Joined: Jan 2003
Posts: 15,172
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From: State of Confusion
5500 x .006 x 1/2 TH (Tire Height, or 13.5 ) div/by 4.11 = 108.39 MPH +/-
Race Director
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From: Forked River NJ
Race Director
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From: Foxfield CO 1970 Convertible
Drifting
Joined: Jun 2007
Posts: 1,404
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From: Ansonia/NYC CT
Hmmm.....so, now I know. My speedo is off by about......30 miles per hour. Good GOD!!! No wonder it felt...."Fast", lol.
And on another good note, I smoked a NEW Rustang GT the other day. God, that felt so good. A little sign that I am getting some things doen with this car.
And on another good note, I smoked a NEW Rustang GT the other day. God, that felt so good. A little sign that I am getting some things doen with this car.
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
It just really shows you how non OD trannys really suck. If Ironcross had a TKO 600 with a .64 OD he would be doing nearly 160 mph at the same 5500 rpm. I have driven my 434 ci vette for about 20 miles at over 6000 rpm in 5th gear and 4.11 rear end. It gets my speed fix in for a few days
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
In 6th gear at 6500rpm with my 25.5" tire and 3.55 gears I would be at 277mph. So I guess my car isn't gear limited. 
And with 600hp on tap my car probably wouldn't be hp limited.
So the remaining factor would be the car itself.
I'm sure it would catch air and/ or destroy itself before it hit top speed. 
Can you imagine having wheel bearing failure crawling past 160mph? ---> 
And with 600hp on tap my car probably wouldn't be hp limited.
So the remaining factor would be the car itself.
I'm sure it would catch air and/ or destroy itself before it hit top speed. Can you imagine having wheel bearing failure crawling past 160mph? --->
Racer
Joined: Apr 2007
Posts: 361
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From: Sacramento (Citrus Heights) California
In 6th gear at 6500rpm with my 25.5" tire and 3.55 gears I would be at 277mph. So I guess my car isn't gear limited.
And with 600hp on tap my car probably wouldn't be hp limited.
So the remaining factor would be the car itself. I'm sure it would catch air and/ or destroy itself before it hit top speed. Can you imagine having wheel bearing failure crawling past 160mph? --->
And with 600hp on tap my car probably wouldn't be hp limited.
So the remaining factor would be the car itself.
I'm sure it would catch air and/ or destroy itself before it hit top speed. Can you imagine having wheel bearing failure crawling past 160mph? ---> 
Race Director
Joined: Apr 2003
Posts: 19,344
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From: Tampa, Florida
It just really shows you how non OD trannys really suck. If Ironcross had a TKO 600 with a .64 OD he would be doing nearly 160 mph at the same 5500 rpm. I have driven my 434 ci vette for about 20 miles at over 6000 rpm in 5th gear and 4.11 rear end. It gets my speed fix in for a few days