how much would 100-200 pounds off your car bring your time down? someone told me its like one tenth every 100 pounds. can anyone give a second opinion

 

<-- second opinion, i heard thats correct also, so i guess its close nuff'

 

also depends how fast your going, 100 lbs on a 18 second car might pick it up .3-.4 but a 100 lbs on a 8 sec car might only make a .05-.1 difference.

I mean look at it this way, Alcohol Dragsters run 5.50's w 3500hp, Top Fuelers run 4.50 w/ 6500hp. 3000 more hp to go a second faster.

 

how about we not make it so complicated and just say "On average..."

 

Yeah i also heard it depends on torque a bit too...less torque=bigger difference

 

OK, look at it this way...
You have 600 hp and your car weighs 2100 lbs. That's 3.5 lbs/horse power
Same car and engine except it only weighs 2000lbs. That's 3.33 lbs/hp
Take your 2100 lb car and divide that by 3.33 lbs/hp.
That comes out to 630.6 horse power.
So pulling 100 lbs out of your car should give you the same performance increase as adding 30.6 horsepower.
Same equation with a 200hp car would net a 10hp increase.

 

you can't say that it will give you exactly one tenth per so many lbs. It doesn't work that way. You have to work however much weight into your power/weight ratio, and then figure it out.

Say you have a 300hp, 3000lb car, and you have a 200hp, 2000lb car. They both have a power/weight ratio of 1:10, right?

But knock 500 lbs off both of them, and all the sudden, you have a 2500lb car with a 1:8.33 P/W ratio, and a 1500lb car with a 1:7.5 P/W ratio..

You may be able to say, that in general, about 5% of the vehicles weight will give you 1 tenth...but it's really difficult to measure that sort of thing.

 

thanks for the info

 

well it helps more to take weight off the rotation assembly....from flywheel to wheels....

16 pound wheels vs 8 pound wheels.....i dropped .3 off!!! in the EIGHT mile!!! nice eh!!

i would take weight of the wheels and drivetrain before i would strip my car!

 

rule of thumb.......

big V8 cars lose .1 for every 100 lbs.

Us little torqueless wonders, lose .1 for every 55-60 lbs.

 

rule of thumb.......
big V8 cars lose .1 for every 100 lbs.

Us little torqueless wonders, lose .1 for every 55-60 lbs.

Now youve gone and given ideas'

Hmm......

 

well, I'm running 13.09 in a juiced semi stock block SOHC for a reason.......

Weight and Aerodrag are NOT you friends.