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Discussion Starter #1
Below are a few calculations that show the affects when you add HP or subtract weight.

Power at Flywheel (BHP) : 306
Weight without Driver (KG) : 1592
Power to Weight Ratio (BHP Per Ton) : 195.30
0 - 60 (Secs) : 5.61
0 - 100 (Secs) : 13.40
60 - 100 (Secs) : 7.79
Quarter Mile (Secs) : 13.90
Terminal Speed (MPH) : 101.87
Drag Strip Quarter Mile (Secs) : 13.80
Drag Strip Terminal Speed (MPH) : 103.02

The first calculations are based off of a stock v6 genesis coupe


Power at Flywheel (BHP) : 400
Weight without Driver (KG) : 1410
Power to Weight Ratio (BHP Per Ton) : 288.24
0 - 60 (Secs) : 4.19
0 - 100 (Secs) : 9.27
60 - 100 (Secs) : 5.08
Quarter Mile (Secs) : 12.39
Terminal Speed (MPH) : 115.58
Drag Strip Quarter Mile (Secs) : 12.29
Drag Strip Terminal Speed (MPH) : 116.90


The second set of calculations are based off making the coupe 400 lbs lighter and bumping up the horsepower to 400 (flywheel) hp.


Power at Flywheel (BHP) : 450
Weight without Driver (KG) : 1592
Power to Weight Ratio (BHP Per Ton) : 287.20
0 - 60 (Secs) : 4.20
0 - 100 (Secs) : 8.96
60 - 100 (Secs) : 4.76
Quarter Mile (Secs) : 12.35
Terminal Speed (MPH) : 117.41
Drag Strip Quarter Mile (Secs) : 12.25
Drag Strip Terminal Speed (MPH) : 118.73


The third set of calculations are based off of stock weight but bumping up the (flywheel) hp to 450.Very interesting that it only took 50 more hp to equal the numbers of the 400 lb lighter coupe.
Of course this is very basic and raw and there are so many other variables, but it gives you a general idea how weight and HP affect acceleration.

Car Stats - Calculator
 

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interesting
 

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***** Know It All
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Subtracting weight only helps initial acceleration, after a certain point, it doesn't matter. Reducing weight also benefits handling and braking. If there was a way to test lateral grip, skidpad, and 60-0 numbers, this would put it in perspective. Also, adding 150hp to the V6 requires FI which is going to add weight as well.
 

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MR TURBO 2 U
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Subtracting weight only helps initial acceleration, after a certain point, it doesn't matter. Reducing weight also benefits handling and braking. If there was a way to test lateral grip, skidpad, and 60-0 numbers, this would put it in perspective. Also, adding 150hp to the V6 requires FI which is going to add weight as well.
power to weight ratio all the way

as to the above comment rethink it eg: carry your shopping bags for a minute does it matter less or more at start or the end of the minute! just as you fatigue after the minute to a smaller extent so does the car!

your correct with the rest save the fi 150-200 hp more is achievable no fi but with careful planning and building of the motor!
 

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It does matter more at the beginning. That's just basic physics. The initial movement must overcome the mass of the object, friction, and gravity. Once it's moving, you only have friction and gravity to combat.

Colin Chapman, the founder of Lotus, had these brilliant quotes: "To add speed, add lightness." and "Adding power makes you faster on the straights. Subtracting weight makes you faster everywhere."
 

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MR TURBO 2 U
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It does matter more at the beginning. That's just basic physics. The initial movement must overcome the mass of the object, friction, and gravity. Once it's moving, you only have friction and gravity to combat.

Colin Chapman, the founder of Lotus, had these brilliant quotes: "To add speed, add lightness." and "Adding power makes you faster on the straights. Subtracting weight makes you faster everywhere."
is it me? is it difference in culture? can you please stick to facts!

fact is:
1, weight = load
2, yes there is load on take off
3, load / weight has not changed at the end or "after a certain point!" as suggested
4, carrying a load for us is tiresome more so after a while than at the start!
5, similarly, this too is true for an engine! (heat, friction etc.) go do the whole equation then talk to me!
6, your getting confused with power require to move an object to start then keep it moving only the smallest part of the equation!

as to Chapman did i not say "power to weight ratio all the way"? so we agree! so why direct that statement at me? you need brownie points? or a bozo badge?

seems some of u guys just cant be helped!!!

when will you get it through your thick skulls i'm here to help "not to big note" as suggested by some.

but to get info and share it!

to save some of you from being ripped off!

to help point out the lies!

if i say something trust me i can back it up!!! or i wont say it!

i hate shops that lie to make a sale it makes us all look bad and makes me waste time i could spend productively rather than justify everything i say! like right now!!!

now if you got some facts then say them otherwise leave your games for others!
 

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^ Maybe it's because no one understands what you're saying?? :dunno:
P.S. I understand English probably isn't your first language, not trying to rip on you for that. Also not trying to rag on you for not being from the USA.

N20 is right though, it does matter more on the start. That's not to say decreasing weight doesn't matter after you start, it just matters a little bit less.
 

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Phase... Firstly, I'd like you to point out what portion of my post isn't a fact? The law, or the quotes? Secondly, please quit with the huge fonts and colors and all. It's annoying at best, and at worst I'm always tempted to edit all of your posts to look normal.

I just stated basic knowledge. Sure, the first paragraph had to do with your post, but that line break there leads to a second idea. Nowhere did I quote you, so don't take it so personally.

Also, if you want to argue the Laws of Motion with Newton, go ahead, since it's his first law; a body in rest tends to stay at rest, and a body in motion tends to stay in motion, unless acted on by external forces... but it's kinda hard to argue with a dead guy.

edit: I don't need brownie points or anything. Especially when it's easy to get rid of people I have an issue with. ;)
 

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^ Banhammer activate? lolz just kidding
Haha not quite. Takes someone really being an e-douche for that... or just me having a really bad day and someone decides "it's take a potshot at a mod day" :rofl:

edit: oh god I fell for my own white text trick :rofl:
 

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@ phase autos - please tell me you know more about physics than that. your shopping bag analogy has nothing to do with what we're talking about here. N2O is right. Once an object is moving, it takes less force to keep it moving due to Newton's First Law!!! There's a reason its a LAW!!!

Think of it this way....try pushing a heavy piece of furniture across a smooth surface. It is hard to get started, but once it is moving, you don't have to exert near as much force to keep it moving. Same with a car....

On a side note, is it just me or did you just try to turn this into a marketing pitch?
 

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I cleaned up the thread. What I said still stands.
 

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MR TURBO 2 U
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What I said still stands.
this means?

are you not allowed private contact details? if so i will gladly remove them infact i will hide them til i get an answer from above or i find the relevant forum rules!

and thanks for the courtesy of a pm with an explanation!
 

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I think if I posted a phone and email it would be ok, but since you have obvoiusly showed interest in making or selling items in the future, you can't do that now. Like if I came on selling wheels, and then put a personal phone and said call me for engine related quesitons.... That could be me backdooring the vendor rules as I am not posting my number to sell but to help... but once on the phone, who knows what you talk about.

I think that is what he is getting at.

One of the good thing about helping them in public online is it could help more than one, and it grows the forum. A phone number can help on a case by case basis which you can provide to those who want it via PM withough breaking any rules.
 

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You have PM. Please stop derailing the thread. Otherwise I'll have Kam ban you. :rofl:
 

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@ phase autos - please tell me you know more about physics than that. your shopping bag analogy has nothing to do with what we're talking about here. N2O is right. Once an object is moving, it takes less force to keep it moving due to Newton's First Law!!! There's a reason its a LAW!!!

Think of it this way....try pushing a heavy piece of furniture across a smooth surface. It is hard to get started, but once it is moving, you don't have to exert near as much force to keep it moving. Same with a car....

On a side note, is it just me or did you just try to turn this into a marketing pitch?
no but i know how to apply rules to calculations these are the op's calculation description from his chosen site!

ALL theory performance figures quoted on the car statistic lists are calculated using the Letstorquebhp.com formulas (calculator), none of them are from any given road test. All the figures are THEORY only and the aim of the site is for a fun comparison between all types of performance cars, standard or modified, and mainly in the UK, although some imports are covered.
1) The Formulas used and statistics shown on letstorquebhp.com theory performance web site and calculator, predict 0-60mph, 0-100mph and ¼ mile times (with the ¼ mile terminal speed) for road legal cars on road legal tyres. To check the accuracy of these figures we recommend you compare them to real life road test figures that you may have come across in magazines and sites.

2) It also calculates a separate Drag ¼ mile (with terminal speed and not in relation to the road figures shown) to show the slightly quicker time on a well gripped Drag Strip approved surface. This figure should be compared with real drag strip times achieved at official events (and not the road figure mentioned earlier). They do not allow for none road-legal drag slicks (which can be up to a second quicker on the 1/4mile if not more depending on the drive type).

3) The formula’s only use three items of easy obtainable data to produce the figures, these are Flywheel Power (BHP), Kerb Weight (KG) and Drive type (4WD, FWD or RWD). Formulas do not take into consideration other factors that could also affect real life figures, e.g. torque, gear ratios, aerodynamics, air density, temperature etc, these are not easy obtainable.

4) The 0-60 (and 0-100) quote takes into consideration an average amount of manual gear changes. In real life times can vary if an extra gear change is required before reaching the quoted speed.

5) A “through” 60-100 time is also quoted by subtracting the 0-60 from the 0-100 figure. The real time to cover this segment may well be quicker (due to correct gearing) but the “through” figure shows the time elapsed between 60-100 while covering the 0-100. It gives an indication of a car’s comparison performance once moving, and does not confuse the figures with a different amount of gear changes between cars.

6) Average aerodynamics are used and therefore terminal speed and 0-100 can be slightly out; terminals are based on Power and ¼ mile times.

7) Traction difficulties are taking into consideration for each drive type formula, e.g. 4wd can launch very quickly showing an improved 0-60 (and ¼ mile) compared to Fwd which can suffer from reduced traction off the line.

8) The 4WD formula has now been adjusted (times increased) to allow for heavier cars (e.g. over 1500kg) when launching.

9) Formula’s have been setup to allow for the real possible traction limits of proven cars, e.g. quickest times possible (for the very highest possible power) for 0-60 are set at 2.5secs for 4WD, 2.7secs for RWD, and 4.0secs for FWD, although careful drag suspension setup and legal drag tyre/wheel choice may well be very important to get anywhere near these times.

10) Road/tarmac ¼ mile terminal speed is connected with the quoted 0-100, i.e. if the terminal speed is exactly 100mph then both times should be the same.

11) The calculator has been set with maximum and minimum parameters to stop users entering unrealistic data for the drive type used, to avoid bikes, and none performance vehicles:

4 Wheel Drive (4WD)
Minbhp - 70bhp, Maxbhp - 1500bhp
Minkg - 700kg, Maxkg - 3000kg
Minbhp/ton - 95bhpton, Maxbhp/ton - 1000bhp/ton

Rear Wheel Drive (RWD)
Minbhp - 70bhp, Maxbhp - 1500bhp
Minkg - 350kg, Maxkg - 3000kg
Minbhp/ton - 95bhp/ton, Maxbhp/ton - 1300bhp/ton

Front Wheel Drive (FWD)
Minbhp - 70bhp, Maxbhp - 700bhp
Minkg - 600kg, Maxkg - 2000kg
Minbhp/ton - 95bhp/ton, Maxbhp/ton - 700bhp/ton

12) All formulas were designed with trial and error using research from proven road tests in magazines, this covered various different levels of cars that were used as a basis for setting the formulas, for example, figures from Hot Hatches like the Clio 172, to Supercars like the McLaren F1 were used as a guide. Also results from official modified car events were used as a guide when allowing for very high BHP per ton.

13) We suggest if you're asking us to predict the time of an extreme highly modified vehicle that has a full dog box then, as a rough guesstimate, please minus a few tenths from the drag 1/4 mile that we calculate, e.g. if the vehicle has 800bhp then minus 0.8 seconds from the drag 1/4 mile, if it has 600bhp then minus 0.6 seconds and so on. A full dog box can make a noticeable difference above 60mph, so we hope to have this option supplied with the calculator soon.
where is newton? opps no mention! here is another few!

Horsepower from 1/4 Mile Time & Speed (ET/MPH) Calculator
1/4 Mile ET Calculator
Horsepower Calculator from 1/4 mile ET and Trap Speed - DragTimes.com

what still no mention!

so i'm wrong and all your drag calculators too!

but a few keyboard warriors that know it all are right! think not!
:bowdown::bowdown::bowdown:
 

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***** Know It All
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Wow, this thread boomed in the past few hours, LOL
 
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