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Author Topic:   dust bowl track - need help
dirt04
Dirt Roller

Total posts: 5
posted August 14, 2005 03:29 PM  
Looking for set up help for small bull ring trck with no bite. It seems like our set up works on a track with moisture but when it dusts up we just spin the tires. What is everyone else trying to due? Here is our basic setup: rh= 5" lf 5.75" rf 5.75:lr 6" rr 80 lbs of left rear weight 63.5% rear 53.5% left side 6th hole on rear panhard

racerwilson
Dirt Freak

Total posts: 357
posted August 14, 2005 06:42 PM  
First off what chassis do you run? What shocks,springs,bars do you have. How well does it turn in? When does the wheels start to spin?

dirt04
Dirt Roller

Total posts: 5
posted August 15, 2005 04:55 PM  
we run a bicknell chassis. front springs are 250 lf and 150 rf. The car goes in good, when it hits the apex of the corner the wheels brake free and the car gets loose. The bars are 900 rr and 950 lr both rollers in the back position. we run a standard shock package 162-55 and 208-72.


racerwilson
Dirt Freak

Total posts: 357
posted August 15, 2005 07:47 PM  
Your set up seems close. Do you run a spring bar? If so what rate is it and what length is it set at. You might want to try going to an EZ-up front shock 120-55 on both fronts. This will help transfer more weight to the rear wheels under throttle.

dirt04
Dirt Roller

Total posts: 5
posted August 16, 2005 08:46 AM  

We have run with and without the spring bar. When we used it we had both 900 and 650 lbs springs set at 4 to 4.25". This week we are trying to lower the nitro. pressure in the rear shocks.

If this doesn't work we are thinking of trying a cam change.

dbradley
Dirt Freak

Total posts: 251
posted August 22, 2005 05:38 PM  
What makes yoiu think it's the cam...what RPM range are ya running with what gear?
Darin

racerwilson
Dirt Freak

Total posts: 357
posted August 23, 2005 10:16 AM  
Rpm range isn't always a tell all. I ran at Accord small tight 1/4 mile with a cam ment for OCFS. Would spin the wheels off the corner when car speed would finaly catch up to cam, wham launch the car into the corner just when you are ready to lift. So a cam change could be just what the DR ordered.

dbradley
Dirt Freak

Total posts: 251
posted August 24, 2005 11:25 AM  
What's the best way to figure out the correct cam for a 1/4 miler , or a sweeping bigger track like OCFS???

robferr
Dirt Full Roller

Total posts: 37
posted August 25, 2005 04:38 AM  
I have spoken to an engine builder and he told me bigger isnot better to stick to a cam with 106 lobe and a duration of 256 in and 264 ex at @.50 lifter rise so that seems to work for us

robferr
Dirt Full Roller

Total posts: 37
posted August 25, 2005 04:40 AM  
WE run 1/4 to 3rd of a mile tracks even smaller

dirt04
Dirt Roller

Total posts: 5
posted August 30, 2005 04:24 PM  
Changing the shock pressure helped with forward bite quite a bit but we still lacked side bite. Anyone have any other ideas?


skippydoo
Dirt Roller

Total posts: 18
posted August 30, 2005 04:33 PM  
run the chassis flat across the back at 6-1/4 that will give side bite. Also run the front flat at 5-1/2

skippydoo
Dirt Roller

Total posts: 18
posted August 30, 2005 05:04 PM  
do you have ballest in the car? if so how high is it? Higher is side bite. low takes side bite away. I run 60lbs on the rear of my teo up high where the seat belts go thru the seat which is higher than the top of the fuel cell. also more rear spring rate split will help side bite. use at least .050 split and as much as .075 you can also take split out of the front . 225/175 more split in the front makes the car roll over on the rf

dirt04
Dirt Roller

Total posts: 5
posted August 31, 2005 07:49 AM  
We have about 75 lbs. of ballast on top of the fuel cell. We are currently running .900 bar in the right rear and .950 in the left.

We tried running a 175 rf spring but it made the car push too much going in.

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