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ZUKIWORLD Discussion Forum => Suzuki 4x4 Forum => Topic started by: LawDog on July 13, 2005, 06:31:41 AM

Title: Equation for actual speed
Post by: LawDog on July 13, 2005, 06:31:41 AM

OK, i searched but can't find it.  There's some equation that tells us how fast were actually going right?  I'm on 33's with stock 3.73's and my speedo says 60mph.  How fast am I really going?

Title: Re: Equation for actual speed
Post by: zaggy on July 13, 2005, 06:49:30 AM

RU ready

     Tire diameter (33") divide by 12= (2.75')

     2.75' X 3.14= tire circumfrence (8.635')

     8.635 X 1000rpm= (8635')

     8635 divided by gear ratio in 4th (1:1) (3.73)=2315' per minute

     2315' per minute divided by feet in a mile (5280) = .438

     .438 X 60 mph (mile a minute)= 26.3 miles per hour per 1000 rpm

      60mph divided by 26.3= 2280 rpm for 60mph

     For 5th you have to adjust for the od ratio effect on the rear end ratio
     (5th ratio X 3.73= actual ratio)

     And you can mix and match the formula to figure out darn near
     whatever you need.

     Example: I use the same formula to work out propellor tip speed


    Zag

     
     

Title: Re: Equation for actual speed
Post by: Cwkick on July 13, 2005, 07:02:16 AM

Try this!

http://www.izook.com/gearcalc.htm


Cwkick

Title: Re: Equation for actual speed
Post by: zaggy on July 13, 2005, 07:47:05 AM

Well if I had know that I could have sved a math lesson

Zag

Title: Re: Equation for actual speed
Post by: wildgoody on July 13, 2005, 08:20:54 AM

What's the 12 Zaggy ?
I thought Pi * Dia = Cir ?
Or is my Geometry rusty

Wild

Title: Re: Equation for actual speed
Post by: zaggy on July 13, 2005, 08:24:38 AM

Converting tire diameter from inches to feet.....sorry should have explained better
12=12"

Zag

Title: Re: Equation for actual speed
Post by: wildgoody on July 13, 2005, 08:28:57 AM

Dohh, I should of cought that   :-[

I convert that later, I find whole inches
are a little easier to figure in my head
than decimals

Wild

Title: Re: Equation for actual speed
Post by: zaggy on July 13, 2005, 08:30:04 AM

I'm gettin old...I don't even try to figure in my head no more

Zag

Title: Re: Equation for actual speed
Post by: wildgoody on July 13, 2005, 08:37:30 AM

Well I let the Calculator figure Pi
the rest I can get close or estimate
unless it's a critical thing

Wild

Here is an easy way to quickly
figure an engine's displacement,
and I always use the Calc for these

bore*bore*stroke*3.1417 and you get
a long #, or you can multiply by .0031417
and the decimal comes out at the right spot

example 75*75*90*3.1417 = 1590485.625
the stock displacement of the SideKick 1.6L engine

Title: Re: Equation for actual speed
Post by: Bobzooki on July 13, 2005, 09:20:04 AM

Quote from: wildgoody on July 13, 2005, 08:37:30 AM

Well I let the Calculator figure Pi
example 75*75*90*3.1417 = 1590485.625

Oh, man, you'll never get a good answer using 3.1417, everybody KNOWS Pi is more like 3.1415926, right?   ;D ::) ;)

Title: Re: Equation for actual speed
Post by: mrfuelish on July 13, 2005, 02:02:03 PM

the best is GPS  turn it on and drive.  ;D

Title: Re: Equation for actual speed
Post by: wildgoody on July 13, 2005, 08:03:47 PM

Well Bob, it's really more like
3.1415926535897932384626433832795
but I just get too tired typing it all in
 ;)

Bob PM me, I need your address, I still
have your 5mm allen wrench, I look for you
before I left, but I couldn't find your campsite

Title: Re: Equation for actual speed
Post by: mrfuelish on July 14, 2005, 12:01:04 AM

You need this guy.   http://www.japantoday.com/e/?content=news&cat=2&id=342234

Title: Re: Equation for actual speed
Post by: wildgoody on July 14, 2005, 09:55:22 AM

 :o

I have other things to do besides
remember Pi to the 83,000 digit

 ;)

Title: Re: Equation for actual speed
Post by: LawDog on July 14, 2005, 09:59:12 AM

Japan Today later printed a retraction.  He had really eaten 83,431 pieces of pie to set that Guiness record. ;D 8)

Title: Re: Equation for actual speed
Post by: wildgoody on July 14, 2005, 10:03:07 AM

Ohh Brother,
Pi Pie what's the difference
 :)

Title: Re: Equation for actual speed
Post by: zaggy on July 14, 2005, 10:05:04 AM

What ever happened to the hot rodders credo
- Measure with a yardstick
- Mark it with chalk
- Cut it with a torch
- Beat it till it fits

Zag

Title: Re: Equation for actual speed
Post by: SnoFalls on July 14, 2005, 10:13:44 AM

Quote from: zaggy on July 14, 2005, 10:05:04 AM

What ever happened to the country folk credo
- Measure with a yardstick
- Mark it with chalk
- Cut it with a torch
- Beat it till it fits

Fixed it for ya :)

Around me "hot rodders" ..
- Measure with a micrometer
- Mark it with laser etch
- Cut it with a plasma
- Buy big dollr and hope it fits

and then the "ricers"
- pay someone to do it for me

 ;D

Title: Re: Equation for actual speed
Post by: bashzuk on July 15, 2005, 05:41:02 PM

Quote from: mrfuelish on July 13, 2005, 02:02:03 PM

the best is GPS  turn it on and drive.  ;D

Gotta agree with this answer.
Course you could just drive by one of the radar guns with the numbers on it. Not real acturate though