Re: Rocket Science

[Jason <jason@scirocco.org>]

At 01:11 PM 1/12/99 , you wrote:
>RPM 5,750
>Tranny 9A 
>Gear 5th
>Final Drive 3.67
>5th gear .89


Allright Speed Demon,
	Depends really on the size of your tire.  If you have a tire/wheel size
comparable in diameter to the stock size:
	175/70-13
	185/60-14
	195/55-14
	195/50-15
	205/50-15
	205/40-16

Then you can use this calculation:

Each 1000rpm is approximately equal to 20.85 mph...

Of course, different tires have slightly different heights, and tire
pressure will affect that even more... but with that said...

Multiply 20.85 by 5.75 (5750rpm) and you have 119.9mph... so figure around
120.  But remember, the tachometers on our cars are by no stretch of the
imagination accurate.

On the dyno, my tach said 7,800 when the car hit the rev limiter, and the
dyno's computer agreed with the rev limited, *not* the tach.... and mine
was no more off than was everyone else's...


	Drive Safe!
		Jason
	


----------
jason@scirocco.org
1987 Scirocco 16v
57,000 original miles.
http://members.aol.com/rocco16v  

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