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Author Topic:   fuel cell location
paulickr
Dirt Maniac

Total posts: 110
posted January 27, 2005 06:55 AM  
on my dw8 the fuel cell was located all the way to the right side and the length of the cell was front to rear.
i recently changed it after much study so the cell is now centered just behind the axle and is with the long sides from right to left.
anyone have any experience on this or thoughts about the effects.
i didnt like my left weight being at 53 with me in it and thats why we moved it.

as i understand it we may need to run more stagger now due to a tighter condition but now our deminishing weight can be dealt with more evenly .

[This message has been edited by paulickr (edited January 27, 2005).]

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted January 27, 2005 07:37 AM  
that would be siilar to having a tear drop cell in a DW. They are so big they have to stay pretty much centered between the rails. Best car we ever had was that way.

WE now have a DW9 with the long cell like you have but it is mounted front to back and we have it about centered maybe just a little to the left of center in the frame. That makes it about 52%left without a driver but can be moved 2-3" left and get almost 53% without driver.Teh way I see it if the cell is centered then burnign fuel will have less effect on the car during the race besides merely losing rear%. Move it to the right or left and you start messing with weight distribution more. On the left side as you burn fuel the car will prob get tighter in and to the middle but looser out. On the right side the opposite.

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 27, 2005 09:19 AM  
Also moving fwd to aft as well as up and down can have major effects.

Moving it back, to the rear, it will have more of an effect on the car. It will apply more pressure to the rear tires under acceleration, and may cause you to loose steering under power. basicly a longer torque arm. Fwd the opposite, it will have a lesser effect.

As well, the higher it is, it will have a swing arm effect. Once the chassis rolls over enough, and the cell goes over center (of its swing arm, or torque arm) it can pin the right side down. IF its mounted on the left.

Also, the CL or roll centers when using a J-bar or shorty bar changes the CL of the car. Mounting the cell in the middle of the chassis, may not be technicly be the CL of the car that the chassis swings around. Most of the time its left of center (towards the LR) of the chassis.

Most chassis mount the cells on the tru CL of the suspension, and as far fwd as acheivable. Thats what i notice anyway.

[This message has been edited by Kromulous (edited January 27, 2005).]

2nd2none
Dirt Forum Champ
Total posts: 755
posted January 27, 2005 02:51 PM  
with the cell mounted over to the left you gain LR weight as you burn fuel off

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted January 27, 2005 03:52 PM  
My opinion would be this:

The farther forward you move the cell the less effect burning off fuel will have on the chassis. I would mount it in the center of the car. As far as height goes, I would think having it lower would effect the chassis less.

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 27, 2005 04:22 PM  
Its alot of weight, it could have a major impact on traction, in a good way as well.

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