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Old 12-14-2013, 08:34 PM   #1
TexasFoCi
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Weight Loss Equivalent HP

Weight Loss Equivalent HP

Iím sure many people are well aware but for those of you who have ever wondered. Here is the formula for what weight loss does to the Focus. While removing a set of 200lb subwoofers, uneeded trash and crap out of the back will help. Its not to cost effective for all the aftermarket stuff.

Old Car weight / HP = Old lb per HP
New Car Weight / HP = New lb per HP

Old Car Weight / New lb per HP = EQUIVALENT HORSEPOWER


Example 2700 lbs / 130HP = 20.8 lb per HP
2600 lbs / 130HP = 20.0 lb per HP

2700 lbs / 20 lb per HP = 135 HP

If any one ever wondered how it would feel to have a new carbon fiber hood and save only 10lb. it is equivalent to 0.5 HP. $1000 for a Horsepower. I think lightweight rims and taking out the spare and replacing with a green goo can is your best bet.


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Old 12-18-2013, 06:19 PM   #2
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I think they typically say a 100 lbs drop will give you an extra 1/10th in the1/4 mile. This might go along with those lines.
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Old 12-18-2013, 06:49 PM   #3
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everyone knows STICKERS make them go faster
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Old 12-19-2013, 03:10 AM   #4
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I heard for every 200lbs less you gain 1mpg. REad it somewhere on the interwebs. Sounds significant enough to improve track times tho! Alos if you want to save weight just fill your tank 1/2. lol Also the best way to lose weight in your car is to lose weight yourself. Every see those jocky riders? The reason why they are short and so small is to win!
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Old 12-19-2013, 01:48 PM   #5
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UnbridledCarnage drives a ZX3 with a stripped out interior and he is continually getting 40+mpg. It's just noisy as hell in his car though lol.
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Old 12-20-2013, 12:54 PM   #6
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Close to Magus. The standard jawed about was 100lbs.=10hp.=1/10th sec 1/4 mi.

We ourselves generally talked more in terms of pounds per cubic inch-a great enlightener.................
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Old 12-25-2013, 12:35 AM   #7
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Weight loss has much more significant effects during cornering and braking, where weight gets amplified by G-forces and gets radically transferred from one end of the vehicle to another, and where having the lowest center of gravity becomes paramount. I don't know why everyone is obsessed with horsepower and acceleration. A Focus isn't a funny car.

Also, I would strongly advise people to NOT remove their spare wheel. I have a stripped interior and I retained the spare wheel. MANY tire and wheel shops will either totally refuse to service your wheel, or charge extra money, if you used that fix-a-flat. It's seriously nasty shit and no mechanic wants to deal with it. I wouldn't even consider removing the spare wheel a weight saving option unless you're running a full out race car or have run-flat tires.
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Old 12-25-2013, 09:46 AM   #8
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I pulled my spare because one. Its a standard ZX3 and I have full SVT brakes = wont fit. And I have free tow service. But that is a risk I choose to take at the moment while I am waiting on getting a new set of wheels and have a full size spare.
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Old 12-29-2013, 09:22 PM   #9
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Yeah fix a flat is nasty. Tried using it on two diff occasions about 6-8 months ago cuz 2 of my tires developed slow leaks that sometimes not be so slow. Didn't have my portable tire inflator and was in a hurry so tried fix a flat. Worked but I had really bad vibes above 60. Tire wouldn't rebalance. New tire solved the problem.
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Old 12-29-2013, 09:36 PM   #10
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throw 23 D-tech on board & drop 40 plus lbs & have moar power!
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