Landracing Forum
Tech Information => Technical Discussion => Topic started by: left coast bill on February 04, 2007, 01:01:43 AM
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OK we can now get the speed we need. We did testing at altitude, temp,two way run etc etc. We have a great test road but its not salt. Our test speed is 126 mph Question : what will the salt do to our program.
And no we can't tell you about where the test road is sorry.
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Traction will be less, but for the speeds you are talking about I would imagine traction is not one of your concerns.
It can also be "sticky" - causing more rolling drag. And the way it sticks in wheel wells and along the bottom can throw off your drag coefficient.
Don't know how your test site compares with heat and air density/altitude, but it's amazing how quickly the horsepower drops off when the elevation and/or temperature increases . . .
Only been out there 5 or 6 years, sure there are others on the board that can give better/more detailed feedback.
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Rule of thumb: You will loose about 20 mph per 100 mph so if you are testing at 126 mph you could reasonably expect to go 100.8 mph :-D
But after all, that is still just a guestamate. :wink:
Good luck. I would be interested to see how close my guess is. Keep in touch. :-)
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The fastest our car did on I-80 was about 95 MPH on the big down hill into Salt Lake. Stainless drove it at 230 Mph on the salt. :-o So the salt doesn't always slow you down. :-D
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There is no way to compare unless the salt is very dry. I remember one year when the salt was so dry that everyone destroyed their tires when they spun them. The cords were bare in one or two runs. If spinning is caused by wet conditions your speed will drop measurably and the surface of the tire wears very little but dry salt will surprise you in comparison.
My 600 cc street bike tached 156 MPH on the asphalt headed toward the "end of the road" and we received a 152 MPH timing slip. The salt was exceptional and there wasn't enough power to worry about wheel slip.
Run on your test road and compare after your salt experience but don't expect the same results the following year. The asphalt changes very little but the salt changes day to day.
FREUD
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On the trailer with bad brakes on the old Salt Coach was a bad way to get speed comparisons, but it was the fastest the combination had gone at the time. At least that is what we told 'em at the gas stations when asked the how fast question....
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We play a game with the locals every time we stop for gas and the racer drew a crowd.
The game was "AWE BS".
The way it worked was as you might expect they would always ask how fast is it.
Each person with us took turns giving the locals a speed.
Each time we stopped and another one of our tribe was up, he was required to give a faster speed and still be believed.
That continued the speed up until finally the local victim would say "AWE BS."
That was the end of the round and the tribal loser had to buy the next meal.
"Ifn rasin wernt tuf, everbuddy woodb dooin sum."