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Author Topic:   Rough track set up changes?
viper3244
Dirt Full Roller

Total posts: 57
posted August 07, 2005 09:43 PM  
The track we normally run is fairly smooth, and Our car is a wicked fast on a smooth semi-slick to tacky conditions. This week we ran on a track that was extremely rough in the center of the corners. It would upset the car terrible. when the car would hit the dip it would get a nasty push. I run a short bar on the lower left. Will this make it worse when running on a rough track? I know I am close here because we have been running in the front, just want to have an idea what changes I could make to help get that little extra. thanks.

x13jc
Dirt Freak

Total posts: 390
posted August 08, 2005 07:39 AM  
May sound a little crazy, but you could loosen the car up, and let the right rear tire slide over the chug-holes in the track. When we run on a rough track, we will drop the j-bar on th frame side down a hole. Just something that wont let the RR tire dig in the track as much

viper3244
Dirt Full Roller

Total posts: 57
posted August 08, 2005 08:33 PM  
JMILLER; YOU ARE PROBABLY RIGHT I RUN MY J-BAR A LITTLE BIT DIFFERENT THAN MOST PROBABLY DO. I RUN IT AS LOW AS I CAN ON THE PINION SIDE, AND ATLEAST 9" UP ON THE FRAME SIDE. OUR DRIVER DRIVES IT IN SUPER HARD THE CAR HAS A TON OF SIDE BITE. I MAY NEED TO TAME IT DOWN A BIT ON THE ROUGH STUFF. BUT THE HOLES SEEM TO BE IN THE CENTER OF THE TURN SO I DON'T WANT TO MESS WITH ENTRY IF I CAN HELP IT. I WAS HOPING TO FIND SOMETHING TO HELP THE CAR FLOAT ON THE RUTS.

irace74
Dirt Forum Racer

Total posts: 80
posted August 08, 2005 11:49 PM  
Indexing the birdcages on a 4 bar to put the car on the springs earlier will also smooth the ride. For instance, shorten the top left bar by 2 turns, lenghten the bottom left 2 turns and put 2 turns in the spring if it is on the birdcage behind the axle. This will index the left rear such that the car is on the spring more but should not appreciably change the wedge or static weight of the corner. Similar changes to the right rear.

By placing the car "on the springs" when the chassis is extended, the springs will accept all of the ruts and bumps rather then the bars transmitting the bumps into the chassis.

Additional changes such as softening the shock package one valve might also help to allow the car to work through the holes. If the holes are real bad it may even require a softer spring package.

bachshute
Dirt Maniac

Total posts: 118
posted August 13, 2005 06:04 PM  
on rough race tracks a softer spring package and a stiffer shock package should help to absorb the ruts and help keep the car more stable .
flaten out the j-bar also

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