How much Weight = .1sec in the 1/4?

[CSMRX7]

So how much weight do I need to drop (approximately) to pick up .1 sec in the 1/4 mile?

[QuasarCav]

I've heard 100lbs, calculations like this are not an exact science.

[mdeleon]

^^^ye i was told that as well

[1995_GTI_VR6]

i thought it was about 100lbs + 1 HP? i dont know...:burnout:

[sputnik]

weight has nothing to do with net horsepower

[tsi_neal]

ive always heard that 10hp or 100lbs will get you .1 in the 1/4

But its such a general statement that i cant take any of it as fact. A 500hp car and a 510hp car is ALOT different than 130hp and 140hp in one setup a driver can actually tell the difference, in the ohter i dont think a clock can tell the difference.
Id also like to continue my rant about power curves and that 10hp across a 4000rpm spread is gonna do SO much more than 10 more peak hp, etc but the topic was about weight...

[Redlyne_mr2]

You notice the lossed in weight much more in autox and track days.

[88CRX]

why are you trying to pick up a tenth :rofl: :rofl:


14 second car y0! :D

[CSMRX7]

Cause thats the difference in a 14 sec car and a 13 sec car :D

I wanna do it without mods!!

[JAYMEZ]

Ditch your spare tire , your air pump , abs , AC , plastic containers in the back , passenger seat :rofl:

[Barking_Spidre]

Lose some weight ya fat bastard. :D

[DannyO]

Gaining .1 seconds depends on the car, what do you drive?

[Chim]

Originally posted by DannyO
Gaining .1 seconds depends on the car, what do you drive?

:werd:
It's not exactly a linear relationship, depends on a lot of factors as well.

[lam-boy]

you can maybe take a guess its his Rx7 :D

[JordanEG6]

Originally posted by sputnik
weight has nothing to do with net horsepower


i think he means adding 1 hp AND losing a 100lbs = -.1 s on the strip

[nine4t4]

Stripping out weight, and horsepower/torque are kinda related in the realm of acceleration. Sorry Sputnik but you're spaced out.

(Yes, I do get that his math was confusing)

There isn't a direct connection. Aerodynamics and gearing also matter.

Here's what we used to do.

-Remove Spare
-ditch the jack and tools
-rip out A/C, if your car is serious you're allowed to sweat
-rip out rear seat
-rip out passenger seat (or install vibrating massage, a stripped car with a massage chair for the ladies says alot)
-rip out passenger seat
-remove carpet, radio, headliner, glovebox, any sound insulation (dynamat is great but dense)

You can squeeze a couple hundred from the above, figure 50 for spare and tools, 50 for the rear, 40 for the front, 20 for carpet and insulation. maybe 10 for a cheap stereo, .5 lbs for a glove box, 7 for the AC, .2 for the ashtrays.

have fun

[pitwipe]

:werd: Yep, all that and a decent sized dump before you get to the track... and your set!

[blueripper6]

Really its very simple. Its 4.32^23 RCM/100HP - 1/4Mile. Now that gives you the equilibrium between your car and the track. Now you take that 4.32^23 RCM/100HP - 1/4Mile (answer say 500TRD) so its 4.32^23 RCM/100HP - 1/4Mile = 500TRD, now TRD is Track resistance diameter. So 500TRD is on a .292 wide track(race city) 500 to the square root of the track (.292) is along the lines of 1.21 JGW, you now put your time in the 1/4 multiply by the JGW feature, multiple by 43.292/.994 JIGAWATZ.

That puts you around 100 lbs for .1 :D :D :D

[BerserkerCatSplat]

^ I bet a lot of people would have believed those calculations if it wasn't for the JIGAWATZ! :D :rofl:

[DannyO]

Originally posted by blueripper6
Really its very simple. Its 4.32^23 RCM/100HP - 1/4Mile. Now that gives you the equilibrium between your car and the track. Now you take that 4.32^23 RCM/100HP - 1/4Mile (answer say 500TRD) so its 4.32^23 RCM/100HP - 1/4Mile = 500TRD, now TRD is Track resistance diameter. So 500TRD is on a .292 wide track(race city) 500 to the square root of the track (.292) is along the lines of 1.21 JGW, you now put your time in the 1/4 multiply by the JGW feature, multiple by 43.292/.994 JIGAWATZ.

That puts you around 100 lbs for .1 :D :D :D

Oh dam really, thats awesome, now where can I buy the flux capacitor for it?

[CSMRX7]

Screw the .1 sec I ran .7 sec faster tonight, and I was too lazy to even pull the spare tire LOL!!!

[88CRX]

Originally posted by CSMRX7
Screw the .1 sec I ran .7 sec faster tonight, and I was too lazy to even pull the spare tire LOL!!!

awesome!!! 13.4?

[CSMRX7]

Originally posted by 88CRX


awesome!!! 13.4?

14-.7 = 13.29 @ 104

[88CRX]

Originally posted by CSMRX7


14-.7 = 13.29 @ 104

jeez thats awesome..... so now how much wait to loose 3 tenths for next weekend.

[CSMRX7]

300 lbs!!! Ya right I doubt thats gonna happen, but a couple of mods would put me into the 12s no problem.

[mikestypes]

It is about percentages, not specific weights. Dropping 100 lbs on a 4000 car will do alot less than dropping 100 lbs off a motorcycle.

A 10% drop in weight is similar to a 10% gain in HP.

[Xtrema]

Here you go.

Lose 1100lbs = 2s

http://forums.vwvortex.com/zerothread?id=776885

But you don't have much of a car left.

http://www.sportcompactcarweb.com/features/0208scc_scared27_zoom.jpg
||
V
http://www.sportcompactcarweb.com/features/0208scc_scared20_zoom.jpg

[Christianl]

rofl Im gonna buy a car and do that haha

[djstefan]

Loosing weight wont really help that much. The best way to get your times down, wear this hat:

http://www.handa-accessories.com/hat.jpg

[Mr. Burns]

^:rofl: