What is the magical ibs/hp number? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

gt8613 · 09-08-2013, 10:38 PM

What is the magical lbs/hp number?

For simplicity reasons...lets say that spending a $100 can get you either 100 lbs off your car OR add 100hp to it.

This gives us the equation: $ = H = I or numerically: $1 = 1hp = 1lb.

I think most of us would choose the 100 hp in that scenario.

My question is at what starting value of L would it be make more sense to choose the weight saving instead of the hp?

For example, if the equation instead was the following: $ = H = 100*L
then most of us would opt for the weight savings instead of the power.

So, starting at what value of L would that start happening?

Thanks

GTB/ZR-1 · 09-08-2013, 10:40 PM

Uh... 100hp for $100, compared to just losing 100 lbs?

I'm going to be in the long line...

Mach V Dan · 09-08-2013, 10:43 PM

Quote:

Originally Posted by gt8613

What is the magical ibs/hp number?

Um...I just wanted to mention that the abbreviation for "pounds" is spelled with an "L" and not an "I".

--Dan
Mach V

Luis_GT · 09-08-2013, 10:53 PM

Quote:

Originally Posted by Mach V Dan

Um...I just wanted to mention that the abbreviation for "pounds" is spelled with an "L" and not an "I".

--Dan
Mach V

THANK YOU!!!!

I was like... WTF is ibs???

BlueDubbinTDI · 09-08-2013, 11:03 PM

Uh...what?

MY13FRS · 09-08-2013, 11:05 PM

Quote:

I was like... WTF is ibs???

Forgive him. He's another 14 yr old owner.

TheseColorsDontRun · 09-08-2013, 11:14 PM

$1/hp?! Sign me up? Seriously though, expect to spend $75-$100/hp. A lot of weight shedding is free, if you're hardcore and/or bold enough. Stuff like rear seats and spare tire removal are free.

ATSAaron · 09-08-2013, 11:17 PM

The rule is to 10lbs/1hp..not 1:1 So a 290hp 2900lb car was just as fast as a 300hp 3000lb car.

But that is in a straight line..the lighter car will (usually) handle and brake better.

Aaron

Gen · 09-08-2013, 11:29 PM

Quote:

Originally Posted by ATSAaron

The rule is to 10lbs/1hp..not 1:1 So a 290hp 2900lb car was just as fast as a 300hp 3000lb car.

But that is in a straight line..the lighter car will (usually) handle and brake better.

Aaron

And only up to a certain speed. Typically, the 2900 lb car would get off the line quicker but be slower than the 3000 lb car as speeds increase. It becomes more of an hp / drag issue than hp / weight.

Be-Are-Zee · 09-08-2013, 11:34 PM

Can not compute th

rea d.

gt8613 · 09-09-2013, 12:59 AM

Ooops! thanks for spotting that!

I dunno what I was thinking...

Quote:

Originally Posted by Mach V Dan

Um...I just wanted to mention that the abbreviation for "pounds" is spelled with an "L" and not an "I".

--Dan
Mach V

gt8613 · 09-09-2013, 01:05 AM

You are so loving!

Quote:

Originally Posted by MY13FRS

Forgive him. He's another 14 yr old owner.

gt8613 · 09-09-2013, 01:15 AM

Quote:

Originally Posted by ATSAaron

The rule is to 10lbs/1hp..not 1:1 So a 290hp 2900lb car was just as fast as a 300hp 3000lb car.

But that is in a straight line..the lighter car will (usually) handle and brake better.

Aaron

I used the "made-up" 1:1:1 ratio to simplify things. Since I am hoping someone would enlighten me and give me answers along the lines of what you answered.

I have slightly confused myself at this point...so I removed the rest of what I was initially commenting...

gt8613 · 09-09-2013, 01:16 AM

Quote:

Originally Posted by Gen

And only up to a certain speed. Typically, the 2900 lb car would get off the line quicker but be slower than the 3000 lb car as speeds increase. It becomes more of an hp / drag issue than hp / weight.

I had forgotten about drag and how it came in play.
Thanks. Any other insight on this subject?

09-08-2013, 10:38 PM	#1
gt8613 I dream of BRZ Join Date: Jul 2013 Drives: Prospective BRZ owner. Location: Home. Posts: 548 Thanks: 615 Thanked 84 Times in 66 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	What is the magical ibs/hp number? What is the magical lbs/hp number? For simplicity reasons...lets say that spending a $100 can get you either 100 lbs off your car OR add 100hp to it. This gives us the equation: $ = H = I or numerically: $1 = 1hp = 1lb. I think most of us would choose the 100 hp in that scenario. My question is at what starting value of L would it be make more sense to choose the weight saving instead of the hp? For example, if the equation instead was the following: $ = H = 100L then most of us would opt for the weight savings instead of the power. So, starting at what value of L would that start happening? Thanks Last edited by gt8613; 09-09-2013 at 01:04 AM. Reason: Wrong abbreviation!*

09-08-2013, 10:40 PM	#2
GTB/ZR-1 Senior Member Join Date: Oct 2012 Drives: '13 BRZ in WRB--let's mod!!! Location: Central, FL Posts: 1,224 Thanks: 317 Thanked 449 Times in 262 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Uh... 100hp for $100, compared to just losing 100 lbs? I'm going to be in the long line... __________________ * ‘23 Corolla GR—AutoX/DE toy * '13 Toyobaru P&L Turbo WRB BRZ SCCA XS-A build starting. SOLD * '22 Z51 Vette--sold. * '09 Nissan GT-R--gone, but not forgotten... 10.63 @ 131+ on streeties. * '90 ZR-1 11.0 @ 130.2 & 11.2 @ 132.4 sprayed 120 shot.

09-08-2013, 11:14 PM	#7
TheseColorsDontRun Keep calm and drive on Join Date: Sep 2012 Drives: 2013 WRB BRZ Limited 6M Location: Mt. Airy, MD Posts: 404 Thanks: 56 Thanked 169 Times in 119 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	$1/hp?! Sign me up? Seriously though, expect to spend $75-$100/hp. A lot of weight shedding is free, if you're hardcore and/or bold enough. Stuff like rear seats and spare tire removal are free. __________________ Build thread

09-08-2013, 11:34 PM	#10
Be-Are-Zee Senior Member Join Date: Jul 2013 Drives: BRZ Location: USA Posts: 182 Thanks: 5 Thanked 70 Times in 41 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Can not compute threa d.

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ATSAaron Member Join Date: Mar 2013 Drives: 2013 Raven FR-S Location: Denton, TX Posts: 47 Thanks: 10 Thanked 32 Times in 15 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The rule is to 10lbs/1hp..not 1:1 So a 290hp 2900lb car was just as fast as a 300hp 3000lb car. But that is in a straight line..the lighter car will (usually) handle and brake better. Aaron

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