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Author Topic:   Adding weight
hobby10k
Dirt Freak

Total posts: 226
posted January 25, 2005 01:55 AM  
Ok our track just made a minimum weight rule, now I haft to add 300lbs to my car. where is the best spot to add weight to the car? to get the best results?
Also, I am still trying to figure out if having a huge fuel cell behind the wheels is good or not, some think that (slung weight) is good and some do not. or does it even matter? cause I am thinking about getting a smaller fuel cell and moving it higher and further forward over the rear end. now if it is good I can just fill up my huge one
instead of just running it half full

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LIVE RACING, WHAT ELSE IT THERE?

outlaw#03
Dirt Roller

Total posts: 25
posted January 25, 2005 11:07 AM  
I'd put 200 lbs over the LR and 100 over the RR for starters then scale to see what the
% is.

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted January 25, 2005 11:15 AM  
You first need to scale it to see where you need it the most lets say your rear% is 48 to 49 then you need to add some to the rear to get it around 51% or so (on dirt) then look at you left side weight see what your percentages are there and adjust accordingly if you do add your weight to the rear you need to figure out how the car handles now caus eif you add you weight high then you car should have more of a tendancey to roll more in the corner giving you more side bite it is going to be trial and error for you weight its not going to be add and go

hobby10k
Dirt Freak

Total posts: 226
posted January 26, 2005 02:13 AM  
well I was reading about the fuel cell post above and it looks like the best thing to do is get rid of my huge fuel cell and get me on about 8 or 12 gal.
Yea I figured that I would try and borrow me a set of scales and do it that way, but I was just trying to figure out the best spot to add weight if I was just going to trow it on there if I cant find any scales.
would like to get a set of scales....

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LIVE RACING, WHAT ELSE IT THERE?

ss99
Dirt Maniac

Total posts: 120
posted January 26, 2005 03:20 PM  
Like the other guys have mentioned, you really won't know the answer until you scale the car to see where the weight will be best distributed. That being said, no matter where you put it, make your mounts to allow the weight to sit as low as possible in the car.

leddy #33
Dirt Full Roller

Total posts: 32
posted January 26, 2005 04:04 PM  
When scaling the car, is there a good starting point per wheel? Is there a standard percentage setup that can then be adjusted to suit handling later? I am a newb.

[This message has been edited by leddy #33 (edited January 26, 2005).]

supwitchew
Dirt Maniac

Total posts: 122
posted January 26, 2005 06:59 PM  
A decent starting point when scaling a car is 53% left side, 50% rear(if you can get it up to 52% or so then that would be great), and 51% cross.

Eljojo
Dirt Forum Champ
Total posts: 968
posted January 26, 2005 07:30 PM  
a decent strrarting point is 55% left, 54% rear, and 51% cross----supwitchu must be driving a different car at a different track than me! LOL But -you get the picture?

supwitchew
Dirt Maniac

Total posts: 122
posted January 26, 2005 08:55 PM  
Ya, I guess knowing what kind of car and what class he's running might have helped. Also, 54% rear? The only way I would be able to get that is if I started racing it in reverse.

Speedracer92
Dirt Full Roller

Total posts: 70
posted January 27, 2005 07:53 AM  
I would have to agree with Supwitchew. Those numbers look like pretty much the same as the starting points in the Steve Smith books. My car would weigh 600 pounds over the minimum if i had 54% rear weight. I think half of it is how you like your car to work too.

racin78p
Dirt Freak

Total posts: 333
posted January 27, 2005 10:54 AM  
Numbers, numbers, numbers. They don't mean squat without knowing and understanding the TRACK you are running on. Wet and tacky? Dry nasty slick? Big track/small track, with or without high banks? AND, how do you drive the car? Hobby you recently said you run a high banked 3/8. If it is slick track mostly, keep your weight low. Without a writing a book here it amounts to less body roll. You don't need it on a dry slick. It can and probably will hurt the cars performance in the turns (push like no tomorrow). Iowa_dirt_track_girl is right on the money. You gotta scale first (but knowing how your track is first!!!) I have spend hours upon hours scaling, moving weight around checking the numbers, different wheel off-sets seeing what that does, TIRE pressures and what a difference THEY can make. All in all do experimenting and scaling, be sure to write every single change you make down on paper, no matter how small it may seem. I don't have the numbers here with me, but when I get to them and for what it is worth, I'll post so you can see them. They are something like 55% left, 53% rear and 52. something % cross. Don't quote me on these though. The last numbers we came up with were darn near perfect. Beginning the night we had more air in the left front. After the track went slick, we would drop 1 or 2 pounds in the left front and getting through the corners was a blast. That was the only changes we had to make. It is a good feeling when you get the right set up and everything is working to the peak of performance!

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racin78p
if it ain't fun, then don't run

HONDO
Dirt Full Roller

Total posts: 47
posted January 27, 2005 05:48 PM  
Josh, When you get ready, bring your car out and I'll scale it. We can just set the weights in the car until we get what you need and you can make mounts for it later. We ran the hobby I work on with about 46% rear and finished in the top 5 most nights with a newby driver. We will add more this year. My opinion of our track is that it would be considered a pretty tacky and fast medium banked track relative to the majority of the country. I don't think our dryslick would be near as bad as what some of these guys describe here on the forum. The outlaws run around 125mph by the radar. A good hobby car is probably pushing 85-90 on a good track.

racin78p
Dirt Freak

Total posts: 333
posted January 28, 2005 12:23 AM  
Rock and Roll baby!!!

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racin78p
if it ain't fun, then don't run

rfb320
Dirt Maniac

Total posts: 150
posted January 31, 2005 06:14 PM  
Do you guys think you are better off to keep adding weight even if you are way over minimum to get the pecentages or stay right on minimum and live with the percentages you have? I know lighter is probably faster, but percentages mean alot to.

bobaluuu
Dirt Freak

Total posts: 474
posted January 31, 2005 09:06 PM  
Red Farmer told me years ago"If ya can't tie it down with traction, then weight it down with lead." We never worry about how much the car weighs, if we have been diligent about removing "any" unnecessary weight thats ahead of my hiney. We look for safety first and then good percentages and then total weight.

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Light it up, Baby!

[This message has been edited by bobaluuu (edited January 31, 2005).]

rfb320
Dirt Maniac

Total posts: 150
posted February 01, 2005 06:26 PM  
So are you saying that you are better off to be a few hundred pounds heavier with the right percentages versus the guy that is lighter? And how much heavier is to much?

bobaluuu
Dirt Freak

Total posts: 474
posted February 01, 2005 10:21 PM  
no, all things being equal the lighter car will outrun you. but thats all things equal
if your % are right and tractions great and your light then thats great , but being a couple of hundred lbs overweight in the right places can be the best asset you have if traction cant be found otherwise.

hobby10k
Dirt Freak

Total posts: 226
posted February 02, 2005 11:32 AM  
I think I want to be as light as the rules allow, but I want to get the best percentages that I can with that weight. I just need to eliminate as much weight on the front end as possible. where are the best places to iliminate weight on the front?

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LIVE RACING, WHAT ELSE IT THERE?

bobaluuu
Dirt Freak

Total posts: 474
posted February 02, 2005 07:50 PM  
I heard a formula once for what 100 lbs of weight will cost in time on a track, but thats just as subjective as anything else on this forum. Seems it was 1/10th of a second.

rfb320
Dirt Maniac

Total posts: 150
posted February 03, 2005 05:55 AM  
I know this has been covered alot but as long as we are on the subject of weight and percentages, what is the best percentages to run on a metric car and can you have to much?

hobby10k
Dirt Freak

Total posts: 226
posted February 04, 2005 05:44 AM  
OK does anyone have any info on the fuel cell size that I should use? cause the one in my car is a 32 Gal right now. I have a mod driver that wants to trade me for a smaller one.
now would would using a fuel cell to gain weight be good or bad? would using lead instead be better. Just wondering if having all the weight behind the wheels is a good thing, cause can put the lead above or just in front of the wheels.

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LIVE RACING, WHAT ELSE IT THERE?

racin78p
Dirt Freak

Total posts: 333
posted February 04, 2005 07:57 AM  
Hey hobby10k, I run a 14 gal. cell that is adjustable side to side. I thought about a bigger cell but I would rather have weight that is more PRECISE in where I put/move it. Once again, numbers and what they mean to you and your application (track size, how you drive the car, rules, what the gods say,...) will vary so much from person to person that there is NO one set up that will work for everyone. When you scale the car, and know what numbers you are after, then you can decide where to put and how much weight to deal with. I can't say it enough, SCALE! SCALE! SCALE! after each and every adjustment you make take very detailed notes. It is tedious, time consuming and a pain in the back, but it is worth it. Also, read in the menu section of this site about ballast placement tips. It's in the tool box, provided by Longacre. Race on.

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racin78p
if it ain't fun, then don't run

    

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