Author Topic: Hp needed for % of Speed Increase  (Read 43348 times)

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Offline Stan Back

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Hp needed for % of Speed Increase
« on: April 06, 2010, 06:56:28 PM »
What's the formula(s) for when you can go 160 on 500 HP, how fast you can go with 600 and/or if you need to go 180, how much increased HP you need.

You know -- the square of the increase(?) is half the angle of the dangle or whatever?

Help!!!

Simple Stan
Past (Only) Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- 19 Years of Bonneville and/or El Mirage Street Roadster Records

Offline racer x

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Re: Hp needed for % of Speed Increase
« Reply #1 on: April 06, 2010, 07:19:04 PM »
I found this one
http://robrobinette.com/top_speed.htm

170.025mph on 600hp need 715 hp to get 180mph
« Last Edit: April 06, 2010, 07:21:59 PM by racer x »
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Offline sabat

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Re: Hp needed for % of Speed Increase
« Reply #2 on: April 06, 2010, 07:33:05 PM »
Here's Sumner's calculation Excel sheets, including the one you're looking for. 

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html#Horse%20Power%20Needed

Offline Stan Back

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Re: Hp needed for % of Speed Increase
« Reply #3 on: April 06, 2010, 07:41:31 PM »
The Robinette one gave some unbelievable figures -- and as usual I couldn't access Sumner's spreadsheets.  I guess I'll have to depend on the Shearers for the best answer.

Stan
Past (Only) Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- 19 Years of Bonneville and/or El Mirage Street Roadster Records

Offline Cajun Kid

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Re: Hp needed for % of Speed Increase
« Reply #4 on: April 06, 2010, 07:43:47 PM »
Stan,

Just mash the gas pedal and hang on.....I am sure you have all the power you need.

Charles
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Offline racer x

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Re: Hp needed for % of Speed Increase
« Reply #5 on: April 06, 2010, 08:08:04 PM »
I think it goes... all the power you can afford dose not go as fast as you want.
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Offline desotoman

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Re: Hp needed for % of Speed Increase
« Reply #6 on: April 06, 2010, 10:31:43 PM »
Stan,

Send me the numbers and I will crunch them for you.

Tom G.
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Asking questions is one's only way of getting answers.

The rational person lets verified facts form or modify his opinion.  The ideologue ignores verified facts which don't fit his preconceived opinions.

Offline Milwaukee Midget

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Re: Hp needed for % of Speed Increase
« Reply #7 on: April 06, 2010, 11:58:18 PM »
I think it goes... all the power you can afford dose not go as fast as you want.

Here's the formula - it's corollary is based on boat ownership -

($ x APR) + 5W = S x .99, where

$=$
APR = variable
5W = lodging
S = speed
.99 = "I'll be back next year" coefficient

 :cry:
"Problems are almost always a sign of progress."  Harold Bettes
Well, I guess we're making a LOT of progress . . .  :roll:

Offline Stan Back

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Re: Hp needed for % of Speed Increase
« Reply #8 on: April 07, 2010, 11:35:09 AM »
Payback is hill.

Stan
Past (Only) Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- 19 Years of Bonneville and/or El Mirage Street Roadster Records

Offline Geo

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Re: Hp needed for % of Speed Increase
« Reply #9 on: April 07, 2010, 11:49:10 AM »
Did you want that formula to work forwards or backwards?  :evil:

Geo

Offline Stan Back

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Re: Hp needed for % of Speed Increase
« Reply #10 on: April 07, 2010, 11:50:29 AM »
Yes
Past (Only) Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- 19 Years of Bonneville and/or El Mirage Street Roadster Records

Offline desotoman

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Re: Hp needed for % of Speed Increase
« Reply #11 on: April 07, 2010, 01:36:22 PM »
Stan,

Send me the numbers and I will crunch them for you.

Tom G.

Stan,

Are you sure those are the right numbers you sent me? I come up with a minus 7. Sorry.

Tom G.
I love the USA. How much longer will we be a free nation?

Asking questions is one's only way of getting answers.

The rational person lets verified facts form or modify his opinion.  The ideologue ignores verified facts which don't fit his preconceived opinions.

Offline jacksoni

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Re: Hp needed for % of Speed Increase
« Reply #12 on: April 07, 2010, 01:48:30 PM »
If you are only going 160 on 500 hp you need a different car- 'less you are driving a freightliner or something!  :cheers:
Jack Iliff
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Offline bvillercr

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Re: Hp needed for % of Speed Increase
« Reply #13 on: April 07, 2010, 03:28:10 PM »
If you are only going 160 on 500 hp you need a different car- 'less you are driving a freightliner or something!  :cheers:

it's called a rolling brick :-D

Offline 64avanti

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Re: Hp needed for % of Speed Increase
« Reply #14 on: April 08, 2010, 12:38:33 AM »
The power is proportional to the speed.  To find the power take the ratio of the two speeds and cube that number.  180/160 = 1.125,  1.125 cubed =1.438  so 500 hp x 1.438 = 712 hp, rounded up

So how big is this car?  It has one heck of a CdA!