weight reduction-worth it?
Originally Posted by NastySSoo
The accepted rule of thumb is 100lbs removed is worth 1 tenth and 1 mph.
Paul
Paul
That depends on your power level. 100 lbs on my car has shown to be .06 to .07 sec. I have a friend that has run several fast NHRA Comp eliminator cars, and changes classes by adding or removing weight, and he says he can figure on .05 sec per 100 lbs. Of course, he makes a couple hundred more hp that I.
I tell guys pounds are the same as hp.
Guest
Posts: n/a
Does this make sense?
On a heavier car 100 pounds is not that high of a percentage of weight. Say 100 pounds out of a 4200 pound impy is not that much.
Now 100 pounds out of a 2800 pound car would be a lot more and cut more time because its a higer percentage of weight being pulled?
For example (just throwing out numbers)
10 pounds in a 100 pound go cat is a 10% weight reduction
10 pounds in a 1000 pound car is a 1% weight reduction.
On a heavier car 100 pounds is not that high of a percentage of weight. Say 100 pounds out of a 4200 pound impy is not that much.
Now 100 pounds out of a 2800 pound car would be a lot more and cut more time because its a higer percentage of weight being pulled?
For example (just throwing out numbers)
10 pounds in a 100 pound go cat is a 10% weight reduction
10 pounds in a 1000 pound car is a 1% weight reduction.
Originally Posted by JUICED96Z
Does this make sense?
On a heavier car 100 pounds is not that high of a percentage of weight. Say 100 pounds out of a 4200 pound impy is not that much.
Now 100 pounds out of a 2800 pound car would be a lot more and cut more time because its a higer percentage of weight being pulled?
For example (just throwing out numbers)
10 pounds in a 100 pound go cat is a 10% weight reduction
10 pounds in a 1000 pound car is a 1% weight reduction.
On a heavier car 100 pounds is not that high of a percentage of weight. Say 100 pounds out of a 4200 pound impy is not that much.
Now 100 pounds out of a 2800 pound car would be a lot more and cut more time because its a higer percentage of weight being pulled?
For example (just throwing out numbers)
10 pounds in a 100 pound go cat is a 10% weight reduction
10 pounds in a 1000 pound car is a 1% weight reduction.
To go fast, it all about power/weight ratio. Look at motorcycles, weigh nothing and go 200+ mph with 130ish hp. Make your car weigh 800lbs like a motorcycle and youll hang with John Force, lol.
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I have a lot of weight out of my car yet it still looks stock on the out side, I have not chopped it up you could still DD this car. right now I am at a 3250 race weight and I am 150 pounds. The only missing thing on the interior is the back seat. But will be adding weight as I will be doing a Rollbar. But still need to do a few more costly weight reduction mods.
Dan
Dan
Originally Posted by CaMaRo67RS355
SLPSS99 what all did you do if you dont mind me asking...
Bumper Supports!
AC!
Heat!
Radio! and Speaker!
lightweight carpet
light seats
skinnies
15X10s out back
inner fenders!
abs!
PS!
QA1's and Springs
No power Brakes/Brake booster
all susp. is chromoly and tubular
Basically all the free stuff on the weight reduction list
Dan
Last edited by SLPSS99; Jan 23, 2007 at 08:31 PM.
Staging Lane
Joined: Jul 2006
Posts: 92
Likes: 0
From: phoenix az
the rule of thumb is 100lbs equals .1 off of your et but there are many factors to consider such as hp, tq and total weight. you dont see as high of an improvement on a high horsepower car because the power to weight ratio isnt changed as much say you have a
1000lb car 100hp your power to weight ratio is 10lbs/1hp
a 2000lb car 100hp = 20lbs/1hp
now say its a 4000lb car and you have 1000hp power to weight would be 4lbs/hp
now say 3900lbs with 1000hp= 3.9lbs/hp
now it should be easy to see how depending on the application what losing weight really does for you.
just for the hell of it something a little closer to our cars.
3500lbs with 300hp = 11.66lbs/hp
3400lbs with 300hp = 11.33lbs/hp
3500lbs with 400hp = 8.75lbs/hp
3400lbs with 400hp = 8.5lbs/hp
1000lb car 100hp your power to weight ratio is 10lbs/1hp
a 2000lb car 100hp = 20lbs/1hp
now say its a 4000lb car and you have 1000hp power to weight would be 4lbs/hp
now say 3900lbs with 1000hp= 3.9lbs/hp
now it should be easy to see how depending on the application what losing weight really does for you.
just for the hell of it something a little closer to our cars.
3500lbs with 300hp = 11.66lbs/hp
3400lbs with 300hp = 11.33lbs/hp
3500lbs with 400hp = 8.75lbs/hp
3400lbs with 400hp = 8.5lbs/hp
Originally Posted by gforcejunkie
the rule of thumb is 100lbs equals .1 off of your et but there are many factors to consider such as hp, tq and total weight. you dont see as high of an improvement on a high horsepower car because the power to weight ratio isnt changed as much say you have a
1000lb car 100hp your power to weight ratio is 10lbs/1hp
a 2000lb car 100hp = 20lbs/1hp
now say its a 4000lb car and you have 1000hp power to weight would be 4lbs/hp
now say 3900lbs with 1000hp= 3.9lbs/hp
now it should be easy to see how depending on the application what losing weight really does for you.
just for the hell of it something a little closer to our cars.
3500lbs with 300hp = 11.66lbs/hp
3400lbs with 300hp = 11.33lbs/hp
3500lbs with 400hp = 8.75lbs/hp
3400lbs with 400hp = 8.5lbs/hp
1000lb car 100hp your power to weight ratio is 10lbs/1hp
a 2000lb car 100hp = 20lbs/1hp
now say its a 4000lb car and you have 1000hp power to weight would be 4lbs/hp
now say 3900lbs with 1000hp= 3.9lbs/hp
now it should be easy to see how depending on the application what losing weight really does for you.
just for the hell of it something a little closer to our cars.
3500lbs with 300hp = 11.66lbs/hp
3400lbs with 300hp = 11.33lbs/hp
3500lbs with 400hp = 8.75lbs/hp
3400lbs with 400hp = 8.5lbs/hp
TECH Regular
Joined: Dec 2005
Posts: 437
Likes: 0
From: Northern Kentucky
In my 2700 pound car 100 pounds doesn't equal a tenth. A 130 pound me ran a 5.997 on a Saturday night in good air then the next morning my 225 pound dad ran it in way worse air and horrible track conditions and still ran a 6.071. Every pass I had .02 better in the '60 and 2 more MPH.
Pays to be skinny.
Pays to be skinny.
Staging Lane
Joined: Jul 2006
Posts: 92
Likes: 0
From: phoenix az
im talking about a 1/4 mile track not a 1/8 mile track i should have specified that. and the reason i put down lbs/hp rather then hp/lbs is it shows a more dramatic difference between the weight change. and to some people its easier to compute whole numbers rather then fractions rather then say the difference like with the 3500 300hp which would be .85hp/lb vs. 3400lbs 300hp .88hp/lb. its easier to see that actually makes a difference to the performance imo
Staging Lane
Joined: Jul 2006
Posts: 92
Likes: 0
From: phoenix az
Originally Posted by Hrod382
In my 2700 pound car 100 pounds doesn't equal a tenth. A 130 pound me ran a 5.997 on a Saturday night in good air then the next morning my 225 pound dad ran it in way worse air and horrible track conditions and still ran a 6.071. Every pass I had .02 better in the '60 and 2 more MPH.
Pays to be skinny.
Pays to be skinny.
TECH Regular
Joined: Dec 2005
Posts: 437
Likes: 0
From: Northern Kentucky
Originally Posted by gforcejunkie
see how in the 1/8 its still .074 different thats damn near a 1/10th which it would be in the 1/4.
Another run for me the night before was a 6.050 with a 2600 DA with a track temp around 85. My dad was running with 2900 DA on a 130 degree track and still running 6.071's.
Regardless this isn't the greatest comparison given it's different tracks/weather and you are right about me picking up even more in the 1/4 mile because of the lack of weight I was just trying to provide an example.
We might put my dads 548 which has run a 6.06 in a 3150 pound car into my car that will be 2825 with me in it so I am hoping to gain around 2 tenths via less weight then put it on alcohol to gain another one so hopefully some 5.60's.
