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4Likes
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1
Post By strictlypersonl
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3
Post By Cobra #3170
08-19-2019, 08:27 PM
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CC Member
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Join Date: May 2000
Location: WEST TX USA,
Posts: 91
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Not Ranked
Scaling the car to 50/50
I am wondering if i should scale have my car scaled to all 4 corner and front and rear.. I was watching a show and they scaled their project.
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08-20-2019, 06:24 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,011
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Not Ranked
If the car sits level from side to side and the handling balance is also equal, scaling is mostly an unnecessary luxury. Just make sure that your tire pressures are symmetric first.
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08-20-2019, 06:36 AM
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CC Member
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Join Date: May 2000
Location: WEST TX USA,
Posts: 91
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Thank you Bob
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08-20-2019, 09:57 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
Do a search on cross weights. On a street car, they don't need to exact. But getting them pretty close will help the car handle and brake better.
You can't significantly change front to rear balance or left to right balance without physically moving weight around.
But you can significantly alter cross weights with suspension adjustments.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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08-21-2019, 09:28 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 1,009
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Not Ranked
I have found over the years of making mistakes and then trying to correct them that:
In a non ABS car like a Cobra you are better off going for equal front tire weight than equal cross weight. If I set up for equal cross weight the front tires will have unequal weights and the light one locks up under heavy braking. Since 70% or so of braking force is generated by the front tires I always found it better to equalize front tire weights and accept what I got for unequal rear weight. We have tried it both ways and equal front tire weights were always slightly faster. The best of all worlds is equal side to side corner weights but if you can't get there, equal front weights give you more consistency in braking.
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08-22-2019, 09:04 AM
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CC Member
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Join Date: Sep 2017
Location: Frederick,
CO
Cobra Make, Engine: ERA FIA 2158, ERA 427SC 649 sold
Posts: 179
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Not Ranked
Don't forget to compensate for the weight of the driver.
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08-22-2019, 09:32 AM
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CC Member
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Join Date: Mar 2007
Location: Creedmoor,
TX
Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
Posts: 1,161
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Not Ranked
Make sure you have the ride height set before you corner weight your car. If you were closer you could do it at my shop.
__________________
Steve
Texas Cobra Club-Austin
July 2009 FFCars Picture of the Month
FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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08-22-2019, 09:46 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,000
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Not Ranked
Corner weight the car. It can make a big difference on the street. Just do it. If you have any doubts, check out this lengthy thread, especially the very last post, which says it all. Best way to adjust rear coil overs for proper height on my SPF
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08-23-2019, 06:26 PM
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CC Member
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Join Date: Sep 2001
Location: Danville,
CA
Cobra Make, Engine: CSX 6079 482CI CSX cross ram
Posts: 1,354
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Not Ranked
Patrick seems to be impressed with himself...
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08-24-2019, 12:15 AM
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CC Member
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Join Date: May 2000
Location: WEST TX USA,
Posts: 91
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Not Ranked
Thanks again.
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08-24-2019, 05:14 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,519
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Not Ranked
Quote:
Originally Posted by Cobra #3170
I have found over the years of making mistakes and then trying to correct them that:
In a non ABS car like a Cobra you are better off going for equal front tire weight than equal cross weight. If I set up for equal cross weight the front tires will have unequal weights and the light one locks up under heavy braking. Since 70% or so of braking force is generated by the front tires I always found it better to equalize front tire weights and accept what I got for unequal rear weight. We have tried it both ways and equal front tire weights were always slightly faster. The best of all worlds is equal side to side corner weights but if you can't get there, equal front weights give you more consistency in braking.
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The voice of experience. This makes good sense.
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