what rpm equals what speed.
10-31-2006, 06:31 PM
#41
5th Gear Member
Join Date: Aug 2006
Location: Haverhill, MA
Posts: 3,664
RE: what rpm equals what speed.
ORIGINAL: AdderMk2
there is no friggin way your car was doing 4k in 5th gear.
I can almost guarantee that my car has ALOT more power than yours, and i had to use nitrous to break 150... and thats about 4200 rpms.
your car neither has the aerodynamics, nor the power to go that fast.... so on you my friend.... i call BS
ORIGINAL: frdmstng1986GT
i dont trust those speed calculators. i had my car up to 4000rpm orso in 5th and with 2.73's it said i was doing like 175mph or so in my basicly stock 86 gt.lol.. i dont think so. it doesnt calculate in for wind resistence.. or tire resistence
i dont trust those speed calculators. i had my car up to 4000rpm orso in 5th and with 2.73's it said i was doing like 175mph or so in my basicly stock 86 gt.lol.. i dont think so. it doesnt calculate in for wind resistence.. or tire resistence
I can almost guarantee that my car has ALOT more power than yours, and i had to use nitrous to break 150... and thats about 4200 rpms.
your car neither has the aerodynamics, nor the power to go that fast.... so on you my friend.... i call BS
edit: i forgot to mention my foot was through the floorboard
10-31-2006, 06:51 PM
#42
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: what rpm equals what speed.
133 - 137 makes much more sense. Like I said, I have found that the calculator is very accurate. The things to take into consideration... the RPM (is that a 3000, or is it really a 2950 or 3050?) the tire size (are they properly inflated?)...
But things like wind and friction are not a factor because, although they DO affect how fast you can go...their effects are directly shown on your speed and engine RPM. So that takes them out of the equasion.
A few people made the point that the calculators are for theoretical speeds. This is true, but not in the sense that you are thinking. The "theoretical speed" that it equates is the top speed of your car. If you have X gears in your car, and you have Y transmission, and your redline is Z, then in theory, you can figure out what your top speed is before you bust redline. Of course, your car probably does not have enough power to ever reach that limit (due to drag, etc.) And THAT is how it is a theoretical speed.
But if you are actually traveling at a given RPM in a given gear with a given rear end and given tires, then you can accurately determine your speed. It's just a simple equasion.
But things like wind and friction are not a factor because, although they DO affect how fast you can go...their effects are directly shown on your speed and engine RPM. So that takes them out of the equasion.
A few people made the point that the calculators are for theoretical speeds. This is true, but not in the sense that you are thinking. The "theoretical speed" that it equates is the top speed of your car. If you have X gears in your car, and you have Y transmission, and your redline is Z, then in theory, you can figure out what your top speed is before you bust redline. Of course, your car probably does not have enough power to ever reach that limit (due to drag, etc.) And THAT is how it is a theoretical speed.
But if you are actually traveling at a given RPM in a given gear with a given rear end and given tires, then you can accurately determine your speed. It's just a simple equasion.
10-31-2006, 08:11 PM
#43
Banned
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
RE: what rpm equals what speed.
ORIGINAL: P Zero
Adder, the '85's and 86's are actually MORE aerodynamic than the 87-93's, you have to look at them from the profile, the 85/86 has a pointed nose where the 87+ is almost literally flat. So which is more aerodynamic? Also, you needed nitrous to get to 150????ARE YOU FUKIN KIDDIN ME! Dude my 94 probe GT with 207K on it will do every bit of 140/145, I test drove a new Saturn Ion redline got it goin 150 NO PROBLEM. And those cars only have 200hp, hell the probe probably only has 190. So if your cobra needs nitrous to get to 150 you got some serious problems.
Adder, the '85's and 86's are actually MORE aerodynamic than the 87-93's, you have to look at them from the profile, the 85/86 has a pointed nose where the 87+ is almost literally flat. So which is more aerodynamic? Also, you needed nitrous to get to 150????ARE YOU FUKIN KIDDIN ME! Dude my 94 probe GT with 207K on it will do every bit of 140/145, I test drove a new Saturn Ion redline got it goin 150 NO PROBLEM. And those cars only have 200hp, hell the probe probably only has 190. So if your cobra needs nitrous to get to 150 you got some serious problems.
I'd be willing to be that my car could hit 155+ with 3.73 gears
10-31-2006, 08:17 PM
#44
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: what rpm equals what speed.
ORIGINAL: AdderMk2
I'd be willing to be that my car could hit 155+ with 3.73 gears
I'd be willing to be that my car could hit 155+ with 3.73 gears
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