Otherwise, all bets are off. If it's more of an exponentially shaped powerband, that 3000lb 210hp will beat the same style powerband 200hp car.
Or maybe the extra power lets that first car get into VTEC first, and it will still beat that lighter car.
So in the end, you CAN'T claim what you're claiming on a general basis. However you CAN generally claim that a reduction in mass can be equivalent to a drop in E/T.
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Resident Mechanical / Automotive Engineer, B.A.Sc., EIT
VTEC: Leave it to Honda to give you turbo lag without the turbo
what is this nonsense about weight versus horsepower? 100lbs translates to a 10hp loss? no. if I add my 280 pound fat ass to my cars weight, im not gonna see 25ish hp loss
simply moves a bit slower. same crank power, same wheel power.
yeah but we're not talking sprung and unsprung we're talking static weight. for our examples we will assume that nothing else on the car is changed but the static weight. with less weight to move, the car will get faster.
yeah so f=ma where f=force m=mass a=acceleration a=f/m so as m gets smaller a would get larger essentially making the the time to cover a given distance faster. now for 99% of the cases this holds true 100lbs = .1 sec is the average of time gained or lost for the weight. weight has no direct relation to hp by adding weight it will not effect hp and the other way around.
thats something a ricer would say. "I lost 3000lbs so I must have 50,000whp"
Quote:
Originally Posted by user12
well I stated my reasons.
your turn.
I did what you're saying is asinine
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Quote:
Originally Posted by WVU97GS-R
a ex in perfect condition might put down about 100whp. basically lawnmowers will give you a run for your money
Quote:
Originally Posted by Snoopy
if you're somehow getting the filter on your sri submerged, stop driving.
what is this nonsense about weight versus horsepower? 100lbs translates to a 10hp loss? no. if I add my 280 pound fat ass to my cars weight, im not gonna see 25ish hp loss
simply moves a bit slower. same crank power, same wheel power.
im not saying your engine is magicly losing HP.
but as you stated your car moves slower, same thing as you doing a few mods to your car making it quicker then load your car up full of all your friends...suddenly your car is the same speed it was before you did your mods.
but as you stated your car moves slower, same thing as you doing a few mods to your car making it quicker then load your car up full of all your friends...suddenly your car is the same speed it was before you did your mods.
what are you saying then? that 100 pounds of extra weight translates to a car performing like its down 10hp?
that is incorrect as well. if you have very short gears, you wont see much of a difference. if you have low torque and long ass gears, tehn you might see a larger difference
There is no "one" formula for 100 lbs = 0.1 seconds.
It holds true for most cars. But yes, there is a mathematical way to get it. I can copy and paste my code if you like, but it consists of a computer program solving Ordinary Differential Equations (ODEs) on a time domain of t=0 to t=whatever you want. Then you look at whatever differential or integral you want to find the distance covered in a certain amount of time. If you re-run the program by removing 100 lbs from the mass of the vehicle, you will see that on average, the vehicle's 1/4 mile time improved by about 0.1 seconds.
I use a computer program because it would take weeks to solve hundreds of ODEs by hand since I've got like 10 parameters running with like 10 different equations at once.
__________________
Resident Mechanical / Automotive Engineer, B.A.Sc., EIT
VTEC: Leave it to Honda to give you turbo lag without the turbo
im still not sold on the 100lbs making a difference. now if the difference was like 200lbs, then I could see an average .1 time difference or a performance hit similar to losing 10hp.
but not 100. my car is a putter. its a torqueless motor. it drives close to the same whether im alone and empty trunk, and when I have a passenger and a full turnk. its performance is hit barely. and thats with a motor pushing 80-90 torque on a good day. handling is where its a huge difference
Just remember that on a 15 second car...0.1 seconds is a measly 0.667%....where as 100 pounds out of a 2600 lb car is a noticeable 3.8%. So it's definitely plausible even without doing all the math.
__________________
Resident Mechanical / Automotive Engineer, B.A.Sc., EIT
VTEC: Leave it to Honda to give you turbo lag without the turbo
im still not sold on the 100lbs making a difference. now if the difference was like 200lbs, then I could see an average .1 time difference or a performance hit similar to losing 10hp.
but not 100. my car is a putter. its a torqueless motor. it drives close to the same whether im alone and empty trunk, and when I have a passenger and a full turnk. its performance is hit barely. and thats with a motor pushing 80-90 torque on a good day. handling is where its a huge difference
do you know how fast .1 is? its barely noticeable. especially on a 15 sec car but when you get down to 10-12 sec 1/4 miles it makes a difference
__________________
Quote:
Originally Posted by WVU97GS-R
a ex in perfect condition might put down about 100whp. basically lawnmowers will give you a run for your money
Quote:
Originally Posted by Snoopy
if you're somehow getting the filter on your sri submerged, stop driving.
I use a computer program because it would take weeks to solve hundreds of ODEs by hand since I've got like 10 parameters running with like 10 different equations at once.
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