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Author Topic: So where on the car is the best location to add weight?  (Read 2400 times)
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Bruno
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« on: April 29, 2009, 10:54:41 AM »

so I want to add some lead to the front, and rear of my 1990 corvette,  in regard to the rear where is the best place to locate the ballast ? in front or behind the rear axle?  The easyest place is behind the rear axle, just not sure one would want the weight that far aft?
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panic
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« Reply #1 on: April 29, 2009, 11:25:30 AM »

Thanks for not reading this.
« Last Edit: April 30, 2009, 09:18:33 AM by panic » Logged
SPARKY
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« Reply #2 on: April 29, 2009, 12:37:27 PM »

Before I added any weight to any car ( I would put in on race car scales) but especially a Corvette----I would talk to someone is is running a similar car---some have NOTORIOUS lift
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Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

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Bruno
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« Reply #3 on: April 29, 2009, 01:58:49 PM »

I am primarly concerned about traction,
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McRat
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« Reply #4 on: April 29, 2009, 02:03:47 PM »

1 pound after the axle will give you more than 1 lb worth of traction.  Say wheelbase is 10 ft.  Put 100 lb at 2 feet after the axle, it puts 120lb weight on the rear tires, and removes 20 lb from the front tires.
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interested bystander
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« Reply #5 on: April 29, 2009, 11:25:44 PM »

Other than putting it LOW, this brings up the topic of POLAR MOMENT OF INERTIA regards where to locate weight in the North and South diections.

 I'm curious as to knowledgable Landspeed racers opinions on Elmo vs Bonnevile as to  high? or low?
Are the two venues different. I.E. driving El Mirage you may need to be a sprint car driver therefore low polar moment, but Bonneville, accelerating  over several miles, ya might want a stabilizing high polar moment. You're both times trying to defeat the Spin Gods, but does it take a differnt approach??!!!   
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5 mph in pit area (clothed)
Stainless1
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« Reply #6 on: April 30, 2009, 09:11:24 AM »

Why not run it without any or minimal weight to start, after you weight it and know what the corners are doing.  Then you can see how it feels.  Make and take provisions for adding weight... Think about frame torque from the motor when you start to add weight.  You may not want the weight balanced...
Or just add a bellypan made of 3/8 to 1/2 inch steel and go racing...  rolleyes
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Stainless
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MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
sabat
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« Reply #7 on: April 30, 2009, 10:38:06 AM »

Thanks for not reading this.


Why do you do this?
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SPARKY
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« Reply #8 on: April 30, 2009, 05:27:08 PM »

 evil BPD?  evil
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Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

The # 1 issue is: TO KEEP THE REPUBLIC      
   Center for Self Governance            tncsg.org     mrspowell.org

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller
McRat
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« Reply #9 on: April 30, 2009, 05:55:40 PM »

I'd have to say you should always add weight to the car instead of the driver.  If I don't lose some weight, I'll have to use Crisco to get my firesuit on.   cry

grin

To avoid spinning, I'd say always keep as much weight as possible between the tires, and keep the nose heavier than the rear, but I'm just guessing at that.  "Outboard" tires would have the most "leverage" against the weight of the car to resist spinning, and a heavy nose will naturally try to go into the wind. 
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