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Author Topic:   weight placement and weight transfer
racnfool
Dirt Forum Racer

Total posts: 89
posted April 26, 2005 07:50 AM  
Open for facts and opinions, all help appreciated!!! Tight 3/8 mile track, generally tacky and fast for qualifying and most heats, extreme dry slick for features. I generally kick **** on qualifying (several fast times)and heats are pretty solid- but then I stink in the feature, no side bite , push in the center of the turn. I have a 3 bar car, (short left side panhard) with most of my added ballast near the tail at frame height. car scales as follows 52% left, 57% rear, 52% cross. The three bar is set up to induce rear steer by increasing right side wheelbase minimally and shortening left side dramatically. My best guess is the weight is too low and far back for the feature, with a slick track the car does not transfer enough weight to promote side bite and even the right front does not get enough weight transfer to turn the car after it starts to get on the bars, (my push at the apex?) I would like to maintain the qualifying setup if possible, should I move weight up and forward for the feature, I am already a heavy car but have good HP.

Thanks All,
Racnfool

ratracer10
Dirt Maniac

Total posts: 141
posted April 26, 2005 08:16 AM  
Iím no expert at this, but my opinion is to move the weight up and leave it. Then adjust your panhard bar up for your qualifying and heat. Itís much easier to adjust bars at the track and know what effect it will have. Any weight you add down that low (below roll center) will actually be lifting on the left side as it tries to transfer to the right in the corner.

If you are really set on moving weight at the track, do it first in the garage on the scales. I think you will find that once you start moving weight you will also have to adjust the weight jacks to keep you percentages right.

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- When in doubt, hit the gas.

autoshop
Dirt Freak

Total posts: 298
posted April 26, 2005 10:46 AM  
put the weight high and over the rearend and add weight when it slicks over

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 26, 2005 12:23 PM  
On our LM we have most of the weight about sholder height. We have one 60lb peice we mount on the right rear frame rail when it is tacky, If it gets really slick we move it to the chassis bar right above where it was on the frame. This moves it up about 12-14 inches.

nyimcamod8t
Dirt Full Roller

Total posts: 67
posted April 26, 2005 04:02 PM  
when the track dries out move your lead up higher in the car and move it in closer to the rearend. i hang 60lbs on the bar in front of the fuel cell when the track dries out. alot of ballast near the rear bumper will tend to make the car pendulum on entry when you initially turn the wheel and then get very tight on apex due to the driver backstering to correct the entry loose problem.

jercer2004
Dirt Roller

Total posts: 12
posted April 26, 2005 04:57 PM  
racnfool,go to www.jimmyjudd.com and read the article that Scott Bloomquist wrote and i think that'll lead you in the right direction. It's in the tech section. Hopes this helps.

racnfool
Dirt Forum Racer

Total posts: 89
posted April 27, 2005 12:32 PM  
Thanks guys,
Pretty much reaafirms what I am Thinking. There is a lot of ways to set up the car but weight placement probably needs to be first. I will try to move the weight up and closer to the axle and see what happens.
racnfool

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