Weight? LBs= Horsepower?!

[Hortos]

Hey me and my friends have been arguing over this nonsense for alittle while now.

1. Is 100lbs of weight = to 10 horsepower in identical cars?

2. If your car has 10 horses per 100 lbs will it run 13s? Like an E46 M3.

[randomtask37]

ive herd taht for every 10 lbs u loose its about the equivlant of gaining 1 hp.

[Rob]

weight/hp is not a linear scale. it is very difficult to have an *accurate* measure, most of the "10hp=100lbs" type comments are rough estimates. And without knowing specific power output, weights, tire sizes, wheel weights, gearing, track conditions, etc etc you can't really accurately estimate those things

easy way: test n tune at your local drag strip

[OreoGaborio]

what rob said... there's alot of variables. i guess that 10=100 theory is just kinda like a general rule of thumb estimate, give or take a few hp

[matt325is]

Some say -100lb = - 1/10 in the 1/4 mile

matt

[E30godz]

yea i think thats a better comparison than horsepower

[e30Matt]

Yeah, considering a stock 318iS weights 2600lb w/134hp, I'd say 1hp = 10lb is a really bad estimate...

[808BMW]

Yeah, considering a stock 318iS weights 2600lb w/134hp, I'd say 1hp = 10lb is a really bad estimate...

?

[rs4pro3]

318is has a Lb-hp rating of 19.42lbs/HP
325is 16.73 lbs/hp
M3 14.23 lbs/hp
E46 M3 10.26 lbs/hp
All this info is from this Table(best BMW info you'll ever find)http://www.bmwccaclubracing.com/2004...ableofbmws.htm

[Speed25]

Yeah, considering a stock 318iS weights 2600lb w/134hp, I'd say 1hp = 10lb is a really bad estimate...

He means taking off 10 lbs. would be like gaining 1 horsepower.

[TheyCallMeDale]

there are other factors other than just weight. Add a 4.10 lsd to a 325is and youll beat and e30m3, without changing the power to weight ratios at all

[Rob]

there are other factors other than just weight. l

yup, which sort of invalidates the entire argument, and chunks it under the category of 'bench racing :P

[Digitalwave]

Yeah, considering a stock 318iS weights 2600lb w/134hp, I'd say 1hp = 10lb is a really bad estimate...

You are stupid.

[Rob]

yeah, 318is have 138hp, sucker.

[Brew]

Also, if you lose weight in wheels and tires, there is more of a gain than an equivelant loss of "sprung" weight.