Phlip00WS6

iTrader: (7)

Just wondering how much each passenger (150-200lbs) actually slows you down (car lengths) when street racing in an LS1...

Texas Heat

iTrader: (9)

I dont think much at all, but the ricer's claim about 2 1/2 car lengths per 115 pound girl.

Phlip00WS6

iTrader: (7)

Well thats nuts.. but I figured it had to be worth somthin. I hear that at the track every 100 lbs was good for a tenth, and on the street every hundred was good for a car length.

dragonZ28

iTrader: (32)

I've typically heard that every 100lbs = .1 seconds. I don't know how exact this science is, but the weight will make a difference.

PEDRO

i once raced a gt and he took me bye a car. I let my 3 passengers out and ran him again and took him by 2 or so nad then he accused me of spraying? but depending on the number of people yes it will make a good difference.

Phlip00WS6

iTrader: (7)

Sounds about right.. nearly a car length per person.

jermzz

iTrader: (18)

People make a big difference. I raced an 03 cobra on the freeway and we were dead even, then he took out his passenger who was filming (about 270 lbs id guess) and he started pulling 2+ cars

cantdrv65

iTrader: (3)

Passengers make a HUGE difference....Weight matters!

BeavermanA

iTrader: (1)

ET = CubeRoot of (weight/hp) * 5.825 so....
If your car weighs 3400lbs with 310hp at the wheels, it takes 12.94 seconds in the 1/4, adding 175 lbs would give you an ET of 13.16 seconds. Lets say you have 500hp at the wheels, this will give you 11.03 seconds and adding 175lbs 11.22 sec. There is little difference between the two calculated ET differentials when adding weight to the car; from this formula it seems theoretically you'll lose about .2 seconds per average male in a 1/4 mile race. So if you're racing for anything other than fun, kick your buddies onto the curb before you start .

97sicksled

just open the door and push the fat chick out there took a couple tenths off your 1/4 easiest mod in the world except for having to push a fat chick out off your car, maybe then the passenger side of your car won't scrap the ground

mike c.

iTrader: (1)

if you know alot of fat people like i do they slow you down alot.

marlowchris

Assuming you trap 115 in the quarter. 0.1 sec is about 1 car length. So 150 lb passenger = 0.15 sec = 1.5 car lengths

Plus dont forget about other weight savings, like extra fuel, etc.

duffman

There is more factors than just weight and peak power, such as gearing, torque, torque and power delivery(you would have to know the exact numbers at every rpm), steering, tires, wieght distribution, suspension, and shift timing. So you couldn't be completely accurate, but as a general rule that should be close most of the time.

BeavermanA

iTrader: (1)

Of course the 1/4 mile times aren't going to be accurate; there are a multitude of other factors under the hood and in our environment to give many variable times. If you're using the same car at the same track though, all these factors should remain pretty much constant. The equation is simply for calculating time differentials with respect to added or removed weight, not actual run times.

z_speedfreak

iTrader: (3)

now some one needs to find out how much passengers affect your mpg's

stockz

Formula_X

I notice a huge difference with passengers. One time I had the car full (4 ppl) and I was testing to see if I could even do a burnout... I could barely peel out at all from a dead stop, just a chirp ! Alone, I can roast the tires at 10mph. Every passenger I have, I notice a big difference. You should be able to notice this, its VERY obvious when your driving, the car dogs down with the more people you add.

ebear

I dont mind 1 passenger.. but when my car is full I hate how sluggish it feels

bjamick

iTrader: (31)

mine makes a big difference i only weigh 130 lbs and with just 1 passenger i can tell a diff. but i took out the jack and spare tire and gained half a tenth lol and thats only like 30 lbs so think about a fat a** in your car. big diff

Sc 540i

Good question. I've always wondered how much it mattered.