Another scaling idea..
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From: Round Rock TX
Another scaling idea.. 
I understang the correct way to scale a car is to pre-load the right rear by adjusting up and down on the adjustable QA1's. Well....this means with the car sitting still it will be preloaded. What about when the car transfers the weight and the front two tires are off the ground? Then the pre load is gone right? 
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From: Texas
Originally Posted by Tony Shepherd
I understang the correct way to scale a car is to pre-load the right rear by adjusting up and down on the adjustable QA1's. Well....this means with the car sitting still it will be preloaded. What about when the car transfers the weight and the front two tires are off the ground? Then the pre load is gone right?When the front tires are off the ground 100% of the cars weight is on the back tires. There is no wheelrate effect from the front wheels at that time.
Last edited by Maggie; Sep 19, 2006 at 03:17 PM.
I set the car using spring preload. BUT I also raise the front and load the rears to check. The only problem is the torque of the motor doesnt come into play. This isthe reason for my settings being a little on the heavy side.
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Joined: Sep 2003
Posts: 503
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From: Texas
Madman has alot of experience and has been doing this along time. He is very intuitive when it comes to race cars and is very good at visualizing diagonal load effects.
If you guys are going to scale you own car and use spring loading ("spring preload") to tune for wheelrate it is important not to exceed the manufacture's frequency rating of the spring.
Guys, the benifits of scaling a car are well worth the time and money on a dedicated race car. Do your reasearch and do it right.
Here is a brief primer:
With the car on the scales, and the scales on Blocks that will allow for 10-12 inches of tilt, Block the suspensions travel, air up the front tires to about 45-50 lbs (the tires are a working part of the suspention also). If you can find some hard tires the same size as your slicks put them on,(unless you are running a radial). Slicks will stretch if you air them up enough to eliminate tire sqash. With the driver in the car and fuel in the tank, weigh the car level, tilt and reweigh. Measure the angle of tilt. Calculate the Height of the center of gravity.
What you will need to record:
Front Weight of the Car
Rear Weight of the Car
Total Weight of the Car
Angle of the tilted car
Front Weight of the car tilted
Raised Height of Rear of the Car
Wheel Base
(it's late and I'm tired, I hope I didn't leave something out)
Once the height of center of gravity for the car is known, diagional preload AND torque effect can be calculated.
I won't get into the math expressions in this post. It should be easily found on th net.
If you guys are going to scale you own car and use spring loading ("spring preload") to tune for wheelrate it is important not to exceed the manufacture's frequency rating of the spring.
Guys, the benifits of scaling a car are well worth the time and money on a dedicated race car. Do your reasearch and do it right.
Here is a brief primer:
With the car on the scales, and the scales on Blocks that will allow for 10-12 inches of tilt, Block the suspensions travel, air up the front tires to about 45-50 lbs (the tires are a working part of the suspention also). If you can find some hard tires the same size as your slicks put them on,(unless you are running a radial). Slicks will stretch if you air them up enough to eliminate tire sqash. With the driver in the car and fuel in the tank, weigh the car level, tilt and reweigh. Measure the angle of tilt. Calculate the Height of the center of gravity.
What you will need to record:
Front Weight of the Car
Rear Weight of the Car
Total Weight of the Car
Angle of the tilted car
Front Weight of the car tilted
Raised Height of Rear of the Car
Wheel Base
(it's late and I'm tired, I hope I didn't leave something out)
Once the height of center of gravity for the car is known, diagional preload AND torque effect can be calculated.
I won't get into the math expressions in this post. It should be easily found on th net.
Last edited by Maggie; Sep 20, 2006 at 12:53 AM.
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Joined: Sep 2003
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From: Texas
Originally Posted by ottopsycle
WOW!!!
GOOD stuff!!! This site is Great!...I LOVE this board. I lOVE you GUYs!!!
Michael... easy there big boy. Now put down the mouse and BACK away from the Keyboard.
You are getting way overstimulated....
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Teching In
Joined: Sep 2006
Posts: 9
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From: North Texas
Originally Posted by Maggie
Michael... easy there big boy. Now put down the mouse and BACK away from the Keyboard.
You are getting way overstimulated....
You are getting way overstimulated....
Hey Maggie,
Maybe I should take a cold shower or something. I was a little over exuberant.
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