What parts of a car determine the actual speed in km/ph or m/ph?

Originally posted by GT Man Utd star
I meant:
In Gran Turismo what makes the speed what it is in a race. What things of the car in the spec.
For example: A Nissan Skyline GTV V Spec 2 that has a 1048hp is slower than a RUF CTR2 which has 800hp in a maximum speed test.
Why? What factors of the car cause this? Weight? Torque? Gear Ratio?
And sorry for my wording before.
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Well, assuming you've got your gears set correctly for max speed, then the difference between the Skyline and the CTR2 is that the Skyline has an adjustable rear wing giving downforce. The CTR2 does not.

Rear wing = More drag = less max speed.

Even if you put the Skyline's wing down to it's minimum, it's still more than the CTR2 has.
 
Originally posted by daan
Well, assuming you've got your gears set correctly for max speed, then the difference between the Skyline and the CTR2 is that the Skyline has an adjustable rear wing giving downforce. The CTR2 does not.

Rear wing = More drag = less max speed.

Even if you put the Skyline's wing down to it's minimum, it's still more than the CTR2 has.
Click to expand...

Basically what you are saying is that the aerodynamics of a car have a big effect on top speed, which is true. To see how much aerodynamic drag means to top speed, consider this... For you to double your speed (any speed) you need to increase horsepower eightfold, which means that if your car requires 10 hp to go 60 mph, it will require 80 hp to go 120 mph. Try this for a test: get any Formula 1 car, put the front and rear downforce all the way up and go for the top speed test, then put the downforce all the way down and do it again. You will get a lot more top speed because your car is creating less downforce. The more downforce a car's wing creates, the more aerodynamic drag it creates too.

Weight is another thing that limits top speed. Top big rig trucks like Peterbilts, Freightliners, Volvos, etc... have over 400 hp, but won't go as fast as cars with 400 hp. Weight, however, limits acceleration more than it limits top speed.
 
I think though with a long enough road you could get a mack truck or whatever to go "fairly" fast, cause once youve got upto speed the momentum must be huge!!
 
Originally posted by Gt3iSaLlIc
I think though with a long enough road you could get a mack truck or whatever to go "fairly" fast, cause once youve got upto speed the momentum must be huge!!
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Well, that's obvious, the mass of the vehicle is huge! In Australia they have these huge rigs that cross the country from N to S, E to W and they are fast! It just takes them a while to get up to that speed when they are loaded... Anyone from Australia here has more info on those rigs?
 
Originally posted by Gt3iSaLlIc
I think though with a long enough road you could get a mack truck or whatever to go "fairly" fast, cause once youve got upto speed the momentum must be huge!!
Click to expand...

Mass doesn't have anything to do with top speed. Those trucks can get going plenty fast because they generally have 500hp diesel engines with 10 or 18-speed gearboxes, but they're not meant to go much over 80mph -- they usually have double overdrives to save gas. The aerodynamics and transmission limit the top speed severely. The only thing the extra mass does is hurt acceleration and braking.
 
I don't know if you know much about Physics but mass and momentum are 2 different things. And notice how i said "fairly" fast i never said they could go fast...Plus i think 80mph is fastest enough for something with a mass of about 20 tonnes.
 
after reading all this i am totally confused... I dont even know what the question was!?!
oh here it is:
What parts of a car determine the actual speed in km/ph or m/ph?
Click to expand...
now the answer to this is as follows...
the speedometer is the devise that determines what speed a vehicle is moving at. the sensor for the said devise is usually attached, as some have mentioned on the driveshaft which goes to the axle. now this is not always the case. there are for example some cars that have thier sensor attached near the front/rear brakes measuring rotations of the wheel rather than drive shaft.
I thing that anyone who has mentioned the sensor for the speedometer being attached to a spinning thing is probably correct or close to it. however those who have mentioned anything else, including HP dont have a clue what the question is :p

"what's yer fav car?"
"er.... HP!" :p
 
Originally posted by Gt3iSaLlIc
I don't know if you know much about Physics but mass and momentum are 2 different things.
Click to expand...

Really? I've had two years of college physics, but that's news to me!
</sarcasm>

You post still makes no sense. Let's analyze what you said, since you want to be picky.

Originally posted by Gt3iSaLlIc
I think though with a long enough road you could get a mack truck or whatever to go "fairly" fast, cause once youve got upto speed the momentum must be huge!!
Click to expand...

Now, allow me to fix the grammar and spelling for you:

I think, though, with a long enough road you could get a Mack truck or whatever to go fairly fast because once you've gotten up to speed the momentum must be huge!
Click to expand...

Look at what you said. Read it a couple times. Note the use of the word because. Note that it doesn't even make sense to describe momentum as huge (huge, which is synomymous with massive). Please tell me what because and the words following it are supposed to mean. The only interpretation I could make of your statement is that you think the truck could go fairly fast because it has so much mass (and therefore so much momentum). I was trying to be nice and explain things to you, because your statement makes no sense whatsoever.

You're trying to make some sort of connection between top speed and mass or momentum, and it's just not there. You might as well have said, "I think a Mack truck can go farily fast cause its color is so big!!"
 
Originally posted by BadBatsuMaru
"I think a Mack truck can go farily fast cause its color is so big!!"
Click to expand...

:lol:

come on BBM, give tha kid a break1! :)
hehe!

besides, theres nothing wrong with big colours ;)
 
besides, theres nothing wrong with big colours
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Yeah, damn Americans!
[color=E3E0D6]End sarcasm.[/color]
 
You post still makes no sense. Let's analyze what you said, since you want to be picky.

Now Badbats lets get our spelling correct before we go Criticising people about theirs.
Were did you come up with the theory that mass and momentum are the same thing, there just not! you have to calculate mass before you can calculate momentum, Hence the equation P = m * V. Meaning momentum equals mass times velocity.
I may have wrongly conveyed what i was saying before, but still mass is measured in Kg or Pounds ( I dont know what you use for weight in the US) and momentum is measured in Kgm/s or Killogram meters per second.
And as i have explained to you before im still comming to terms with the English language, so chances are i wont get it right first time.
 
Since we are in the subject of spelling and grammar, I want to be picky too! It's one of my pet-peeves; I actually go through the trouble of editing my posts if I mispell something, I hate :mad: when I read someone's post and there's so much garbage language (and no, it's not slang, it's garbage) that you cannot understand what the person is saying. Here's my two cents:

"There" is not a contraction of "they are", the proper contraction is "they're".

You should write the first letter of the first word of a sentence in upper case, and *please* do not put ALL WORDS IN UPPER CASE! It looks stupid, it seems like you are shouting.

It's not "im", it's "I'm".

The pronoun "I" is always in upper case, there are no exceptions.

And, lastly, if you do not succeed, try again, English is not my first language either! :D

Now, back to your regular program...
 
Oh im sorry, don't cry about it.
My English isnt good im working on it, ive stated this to people on numerous occasions. At least im *****n trying!.
 
Originally posted by Gt3iSaLlIc
Oh im sorry, don't cry about it.
My English isnt good im working on it, ive stated this to people on numerous occasions. At least im *****n trying!.
Click to expand...

I am not criticizing you... I said: If you do not succeed, try again. My fiancee too can barely speak English...

It's just that the topic of language popped up and I wanted to share my two cents... :cool:
 
Originally posted by Gt3iSaLlIc
Now Badbats lets get our spelling correct before we go Criticising people about theirs.
Were did you come up with the theory that mass and momentum are the same thing, there just not! you have to calculate mass before you can calculate momentum, Hence the equation P = m * V. Meaning momentum equals mass times velocity.
I may have wrongly conveyed what i was saying before, but still mass is measured in Kg or Pounds ( I dont know what you use for weight in the US) and momentum is measured in Kgm/s or Killogram meters per second.
And as i have explained to you before im still comming to terms with the English language, so chances are i wont get it right first time.
Click to expand...

My point is that momentum is directly dependent on mass. You were trying to relate top speed to momentum. You implied that high momentum would bring about higher speed. As you seem to know, momentum is dependant on speed. "Huge" momentum, as you said, implies a combination of speed and mass. It is ridiculous to say that going fast makes you go fast, so therefore I must assume that you were trying to say that being heavy makes you go fast.

I'm not trying to be rude here. If you're going to respond, could you please tell me what you were trying to say? As I said before, I know exatly what momentum is, but that doesn't explain your statement.
 
Originally posted by BadBatsuMaru
My point is that momentum is directly dependent on mass. You were trying to relate top speed to momentum. You implied that high momentum would bring about higher speed. As you seem to know, momentum is dependant on speed. "Huge" momentum, as you said, implies a combination of speed and mass. It is ridiculous to say that going fast makes you go fast, so therefore I must assume that you were trying to say that being heavy makes you go fast.

I'm not trying to be rude here. If you're going to respond, could you please tell me what you were trying to say? As I said before, I know exatly what momentum is, but that doesn't explain your statement.
Click to expand...

Yeah sorry about my original statement, let me try and reword what i meant to say. I did write that post at 2am or some stupid hour of the morning.
I meant to say basically that if a mack truck was to reach the top speed that some off these cars do, the momentum would be huge.
Their you go...my bad.:D
 

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