Evolution

Too broad of a question, involving many intangibles, I know.

But how much could I expect to improve quarter mile times and 0-60 times by dropping lets say 200lbs from my evo?

How much does performance suffer when my 230lb friend is in the car?

Any ideas?

NSX

so why are you doing the quarter with a fat kid in the car again?
droping 200 lbs wont do that much. im not sure how much but only a little

GSRTURBO

im sure with an evo, the differences in power delivery and awd more than make up for the weight of your friend, especially modded. But weight plays a huge factor. Try power to weight ratio converters online for an idea what 200 lbs would do for your car. Not exact yeah but a good "ballpark" area.

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-Brandon
DD '92 Civic VX - B18C1 swap - 8spi t04r

dsm_tuner260

i think its for every hundred punds its a hundred of a second off in the 1/4

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bigcox_03

power to weight ratio is very important and means nearly everything in performance. your 230lb friend is hurting your performance and dropping 200lbs should actually be a noticable difference.

drewl

it also depends WHERE you drop the weight from.

you know why long handles make things easier to turn right? the same force placed further from the fulcrum generates more torque.

same thing with weight. if you have weight at the ends of the car, it has more effect than if it's in the middle of the car. that's more important for road racing though. less of an issue for drag racing.

Evolution

The problem also arises in WHERE to drop the weight so the car doesn't lose any benefits considering its a street car. Too many things to consider

I also wonder... when the manufacture builds the car, im sure they calculate the weight distribution with the spare tire and jack and tools. However, thats the first thing that most of us remove. I wonder how much that throws off the balance of the car in favor of slightly better acceleration.

dsm_tuner260

well considering you have to take the spare out to autocross it cant be that much or they would allow you to keep it in.

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if its not built to be beat on it's not built right.

GSRTURBO

yep

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-Brandon
DD '92 Civic VX - B18C1 swap - 8spi t04r

beak

Yeah, weight definately plays a big difference.

Anyone remember that one SCC article of the stock Sentra SE-R, and how they removed every body panel, door and interior piece and ran it again down the 1/4 mile.

Anyone remember the time differences?

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slow2000z28

i read somewhere that its a car lengthfor every 150 lbs that kinda coresponds w/ what dsm tuner260 said

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dangerranger

i think if you drop 200lbs then you run with you fat friend it wont really matter but say if you drop 350-400lbs you will feel the difference BIG TIME
even with your friend in the car but it also depend what you wann do with your car drag street autox for drag you might wanna gut out the interior but if you just looking for a light street car the upgrade everything like racing seats new steering wheels anything and everything you can buy thats lighter will ad up in the end

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Cardomain

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sagvr4

well if you cant tell a difference when your friend is in the car then it doesn't matter! i can tell my car is slower when i have someone else in the car

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~Scott

redline3kgt

Also, theres two different kinds of weight reductions that you can do: Sprung and Unsprung.

Unsprung weight is everything under the suspension that the car must physically move and haul. Taking 20 pounds off of your unsprung weight (ie. rims, suspension, breaks) can be just as effective as taking 200 off of your sprung weight (ie. interior, body panels, etc). Lighter springs, shocks, control arms, wheels, rotors, etc. will affect your performance at a substantially higher rate than lighter seats, gutted trunks, etc. Taking weight off of your engine's rotational mass is critical for performance as well. An engine with lighter pullies, cam gears, and flywheel will be more rev happy, and will be able to produce more horsepower. Removing as much rotational mass as you can throughout your vehicle is key.

Theres many things that you can get to make your car lighter, but theres not really a point unless youre looking to shave every .001 second off that you can.

When I got my rims, I weighed them stock vs. aftermarket, and this is what I got: Stock rims weighed 27lbs each, where aftermarket 5Zigens were 17lbs front and 18lbs rear. Thats a savings of 38lb of unsprung weight. Most noticable was my gas mileage that skyrocketed from a measely 320 miles per tank to 370 miles per tank using the same driving habits! I havent taken it to the track yet for et comparisons, but you get the point.

To be safe, I say 100lb = .1 seconds on the dragstrip, and 20lb unsprung weight = .1 seconds as well.

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-David
...............................
-=Red Line Racing=-
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95GST

it is 1/10 of a second for every 100 pounds. there are many things you can do that will not kill you. first get your friend out of the car.
Removal of Front Bumper Support: 13lbs.
Removal of Rear Bumper Support: 17 lbs.
Removal of Spare Tire, Jack, and Tool: 37 lbs.
Removal of Intake Bracket & EGR: 5lbs
Removal of FMIC Sprayer Bottle: 5.4lbs (empty) 11.5lbs.(full)
Installation of Buschur Racing Intake: 4.1 lbs.
Removal of Interior Sound Deadening & Padding: 17.5 lbs.
Replace Factory Rims w/ SSR Competiton 17" wheels: 6.4lbs (Weight loss using stock size/brand tires will be more, this is a total weight saved factory in the a larger tire (255/40/17).
Replace Factory Suspension w/ DMS Coilover Setup: 6.6 lbs. The DMS suspension weighs a total of 58 lbs. while stock is 64.6 lbs. OR You can use the HKS RS Suspension that has a total weight of 48 lbs. which will save you 10 more lbs.
Removal of AC Compressor & Condenser: 29.6 lbs.
Steering Column Plastic & Metal Insert: 1 lb.
Installation of Carbon Fiber Trunk w/ out wing: 10.6 lbs. The stock trunk weighs 22.5 lbs.with no wing.
Stop Tech 335 mm Front Brakes: 7.7 lbs.
DC Sports Front Strut Tower Brace: 4.9lbs.
Remove Brake Shield: 1.5 lbs.
A carbon fiber hood is HEAVIER than your stock hood. Our stock hood weighed 20.2 lbs. and the carbon fiber hood that we purchased but never installed was 21.6 lbs

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