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hp loss due to weight #377889 Jan 19, 3:46am Jan 19, 3:46am
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Haggard OP
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hp loss due to weight
so, im looking around online for the different cars I see around to see what Im dealing with as far as competition, and Im trying to get a better idea of how much horsepower is lost due to weight. Ive heard that for every 10 pounds you (virtually) lose 1 hp about is that true or is there really no way to truly find out? I mean, I know you dont lose hp, but you have more weight to push with that hp. So, if anyone has a better ratio or maybe a way to calculate, let me hear it! smile

Re: hp loss due to weight [Re: Haggard] #377890 Jan 19, 5:51am Jan 19, 5:51am
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for the celica it's more like 15 pounds per horse..for a gts anyway. most gts dynos go around the 160 whp mark (it's better to use whp than bhp)...and the celica (both gt & gts) weigh about 2,500 pounds. 2,500 divided by 160 = 15.6 pounds per horse that the engine has to push.

so if you lost 15.6 pounds, you would effectively 'gain' a whp unit.

Re: hp loss due to weight [Re: Speed4TheNeed] #377891 Jan 19, 8:30am Jan 19, 8:30am
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oh yea, you can always add your weight into the equation. im 170 so my car ways about 2670lbs. it doesnt really matter though because 2,500 is just an approximation anyway...it varies up to 100 pounds.

Re: hp loss due to weight [Re: Speed4TheNeed] #377892 Jan 19, 8:49am Jan 19, 8:49am
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it depends the weight...gt and gts have different weights and it depends if you have a manual or auto..here:

GT/GT Action Package GTS/GTS ActionPackage

Curb weight(manual/automatic)(lbs.) 2,425/2,460 2,500/2,580

This is from the Toyota website! Left numbers are for gt and the 2 right numbers are for GTS

Re: hp loss due to weight [Re: Speed4TheNeed] #377893 Jan 19, 8:52am Jan 19, 8:52am
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Re: hp loss due to weight [Re: drkramm] #377894 Jan 19, 12:23pm Jan 19, 12:23pm
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Whoa, terrific link! The heaviest thing is the stock Hood, I didn't know it weighs 50lbs! How much does a carbon fiber Hood weight?

Re: hp loss due to weight [Re: Speed4TheNeed] #377895 Jan 19, 12:32pm Jan 19, 12:32pm
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Originally Posted by Speed4TheNeed
oh yea, you can always add your weight into the equation. im 170 so my car ways about 2670lbs. it doesnt really matter though because 2,500 is just an approximation anyway...it varies up to 100 pounds.


you have to account for the weight of 14.5 gallons of gasoline and other fluids in your car


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Re: hp loss due to weight [Re: ct] #377896 Jan 19, 12:41pm Jan 19, 12:41pm
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the stock Hood does not weigh 50 lbs lol.


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Re: hp loss due to weight [Re: ct] #377897 Jan 19, 12:49pm Jan 19, 12:49pm
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NICE LINK! weight reduction is the easiest, cheapest way for a slightly faster car. Better for brakes too. I've stripped a lot of my interior, the one problem is most weight reductions are from the rear area of the car. Which promotes understeer. Rotational mass is the best weight reducer (I.E. lightweight rims, flywheel, accessory pullies). thumbsup

Re: hp loss due to weight [Re: QTRMLR_1] #377898 Jan 19, 1:09pm Jan 19, 1:09pm
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Originally Posted by QTRMLR_1
the stock hood does not weigh 50 lbs lol.


Really? So that info is incorrect..? How much it weighs, anybody know?

Re: hp loss due to weight [Re: GTS_Rosh] #377899 Jan 19, 3:21pm Jan 19, 3:21pm
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i have read other forums aobut this. you can search for more info. prettymuch to get a big difference take every pannel off of yoru car. and strip the interrior down to nothing at all wink goodluck though. post pics when you start your weighterloss program smile

Re: hp loss due to weight [Re: ct] #377900 Jan 19, 3:28pm Jan 19, 3:28pm
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Originally Posted by ct
Originally Posted by Speed4TheNeed
oh yea, you can always add your weight into the equation. im 170 so my car ways about 2670lbs. it doesnt really matter though because 2,500 is just an approximation anyway...it varies up to 100 pounds.


you have to account for the weight of 14.5 gallons of gasoline and other fluids in your car


no the curb weight is the weight of a car with all fluids full and full tank of gas, dry weight is car bone dry.


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Re: hp loss due to weight [Re: GTS_Rosh] #377901 Jan 19, 3:59pm Jan 19, 3:59pm
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Originally Posted by GTS_Rosh
Originally Posted by QTRMLR_1
the stock hood does not weigh 50 lbs lol.


Really? So that info is incorrect..? How much it weighs, anybody know?


I made an estimate awhile back much lower than 50 lbs, think I said 20 and Lucky_317 said it was a bit lower than that. That was in another weight reduction thread. I trust him, but it's definitely not 50 and for those who work out with weights you'd know.


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Re: hp loss due to weight [Re: QTRMLR_1] #377902 Jan 20, 6:57am Jan 20, 6:57am
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20 pounds for a stock Hood? i would have thought it was more (although less than 50). we need someone to actually weigh the thing...i hate trying to make appoximations off of guesses. the innacuracies just get even more blown out

Re: hp loss due to weight [Re: Speed4TheNeed] #377903 Jan 20, 11:07am Jan 20, 11:07am
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If someone got a carbon fiber Hood on there car and perhaps there stock Hood laying around in the garage, please go weigh it for us! Its good to get exact figures, like now I know for sure that stock GTS rims weigh about 19lbs, thanks to the other thread.

Re: hp loss due to weight [Re: GTS_Rosh] #377904 Jan 20, 11:21am Jan 20, 11:21am
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I'll weigh my old Hood when I get home. thumbsup

Re: hp loss due to weight [Re: toycelica74] #377905 Jan 20, 12:10pm Jan 20, 12:10pm
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scratch 20, I'll go the other direction from Lucky and guess perhaps the Hood may be closer to 30 lbs...can't wait to hear the results. I'd weigh mine but it's 350 miles away right now.


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Re: hp loss due to weight [Re: QTRMLR_1] #377906 Jan 20, 1:07pm Jan 20, 1:07pm
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does anyone have a batterie in their trunk? that would help with relocating the weight from the front to the back alittle. also lighter weight engine parts dash peices and Hood help drop the weight in the front.

Re: hp loss due to weight [Re: celicatuner] #377907 Jan 20, 1:27pm Jan 20, 1:27pm
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Ok, my stock Hood weighed in at 26lbs, paint and all. spineyes

Re: hp loss due to weight [Re: toycelica74] #377908 Jan 20, 2:05pm Jan 20, 2:05pm
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Originally Posted by toycelica74
Ok, my stock Hood weighed in at 26lbs, paint and all. spineyes


Whoa cool, thanks man! That's with the stock Hood scoop on it still right?

Re: hp loss due to weight [Re: GTS_Rosh] #377909 Jan 20, 2:14pm Jan 20, 2:14pm
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less weight in the back is better since the car is fwd


respect the gt-s
Re: hp loss due to weight [Re: celicadragon] #377910 Jan 20, 3:01pm Jan 20, 3:01pm
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a lot of the weights listed on that link are bogus.

the stock Hood is around 20 lbs NOT 50 for one huge example.

also the seats weigh about 34 lbs not 40+.

they have the right ideas but don't look at the actual weight.

also they do not account for whp only factory rated power.

my car personally is at 12:1 power to weight.

also rotating weight loss such as lighter/smaller rims play a huge role as well.


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Re: hp loss due to weight [Re: GTS_Rosh] #377911 Jan 20, 3:39pm Jan 20, 3:39pm
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Originally Posted by GTS_Rosh
Originally Posted by toycelica74
Ok, my stock Hood weighed in at 26lbs, paint and all. spineyes


Whoa cool, thanks man! That's with the stock hood scoop on it still right?


Yeah, the stock Hood scoop was on.

Re: hp loss due to weight [Re: toycelica74] #377912 Feb 14, 10:32am Feb 14, 10:32am
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Does anyone know how much the stock battery weights?

Re: hp loss due to weight [Re: speed_celica] #377913 Feb 14, 11:46am Feb 14, 11:46am
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about 31 lbs


Best 60' 1.959 best 1/4 - 13.7 @ 101mph
Re: hp loss due to weight [Re: Lucky_317] #377914 Feb 14, 10:05pm Feb 14, 10:05pm
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im thinking of putting my battery in the back but first i need to get a mat that will cover up the back all the way to the back of the front seats. once i get that im going to relocate my battery to the rear


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Re: hp loss due to weight [Re: EuRoBoYGT] #377915 Feb 15, 4:00pm Feb 15, 4:00pm
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I don't think moving the battery to the rear will make a big difference, and since our cars are FF, it's better to have more with towards the front of the car for traction.

Re: hp loss due to weight [Re: speed_celica] #377916 Feb 16, 5:08pm Feb 16, 5:08pm
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^^ leave the battery in it's stock location if you want to ACCELERATE better (such as in a drag)

it's good from a HANDLING perspective (such as with auto-x) to have as close to 50/50 weight ratio as possible...so relocating the battery to the rear helps out a little because the celica has something like 65/35 weight distribution. putting some weigh in the rear will help you car handle better

Re: hp loss due to weight [Re: Speed4TheNeed] #377917 Feb 16, 5:34pm Feb 16, 5:34pm
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the best weight reduction is to do some sit ups thumbsup

Re: hp loss due to weight [Re: Parabol] #377918 Feb 16, 9:14pm Feb 16, 9:14pm
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Originally Posted by Speed4TheNeed
^^ leave the battery in it's stock location if you want to ACCELERATE better (such as in a drag)

it's good from a HANDLING perspective (such as with auto-x) to have as close to 50/50 weight ratio as possible...so relocating the battery to the rear helps out a little because the celica has something like 65/35 weight distribution. putting some weigh in the rear will help you car handle better


50/50 weight distribution is good for a RWD car, but in a FWD car more weight shift to the rear means less weight on the front. Less weight on the front means less friction the tires can generate, leading to more understeer.

It's true that 50/50 on a FWD would make it feel more balanced, up until you push it to the limit, in which case you'd understeer.

Re: hp loss due to weight [Re: renfield90] #377919 Feb 17, 6:33am Feb 17, 6:33am
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^^ haha guess we can't have it all. the celica already oversteers like a mother rofl rofl

anybody familiar with swinging the celica's rear around? wave

Re: hp loss due to weight [Re: Speed4TheNeed] #377920 Feb 17, 10:37am Feb 17, 10:37am
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Really? I don't find my celica oversteer at all!

Re: hp loss due to weight [Re: speed_celica] #377921 Feb 17, 2:28pm Feb 17, 2:28pm
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Originally Posted by Speed4TheNeed
^^ haha guess we can't have it all. the celica already oversteers like a mother rofl rofl

anybody familiar with swinging the celica's rear around? wave


With Hotchkis Competition Sway Bars and a few other mods (rear strut bar), sure.

With stock suspension, decent tires, and dry pavement...no.

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