Visit The Dirt Forum for More Information

Author Topic:   Neg. Caster on a stock Metric Front End
Hoosier1919
Dirt Roller

Total posts: 14
posted January 17, 2005 08:54 PM  
Read an article in the Circle Track Mag. this past Month. Wondering if I understood what it was based on. They where talking about running Neg. Caster on the front of Dirt track car and pavement cars. They said it best to run neg caster and have a little neg. caster split between the front. I've always was told and have ran +6 on the rf and +4 on the lf. Has anyone tried to run the neg. caster and if so why do you do so .Thanks Hoosier 1919

waltonjr1
Dirt Forum Champ
Total posts: 516
posted January 18, 2005 04:11 AM  
Thats a new one to me, never heard of running neg caster.-1 would be a major adjustment from +4. Try it and let us know. lol


hoosier transplant
Dirt Maniac

Total posts: 104
posted January 19, 2005 04:38 PM  
I haven't read the article but I think what they mean is to run less positive in the left than the right. I know they do call a 2 degree on right and say a 1 degree on left, both being positive, a negative caster split. The car will pull towards the tire that is less, whether that maybe a 4-r & 2-l or 1-r & -1 on left. Somebody please correct me if I'm wrong.

Hoosier1919
Dirt Roller

Total posts: 14
posted January 21, 2005 10:29 AM  
So Transplant Tell Me if you are running a Metric bone stock front Suspension What would you run for caster on a 3/8 mile flat track

hoosier transplant
Dirt Maniac

Total posts: 104
posted January 21, 2005 05:47 PM  
I would run +3 on right and +1 on left. If you're running power steering you might add 1/2 degree in both sides. Don't go more than a 2 degree split. What this can cause is for the front to turn in too easily and cause a loose effect, and if you're not aware of this you can be chasing other changes to correct the loose rearend. You can get away with more split sometimes if you have a rearend suspension like a latemodel and some modifies cause they have a great deal of adjustments they can make so that they can get a real good entry and still not be loose. Hope this helps.

nailngoracing
Dirt Maniac

Total posts: 170
posted January 21, 2005 05:54 PM  
i have heard that the more positive caster than the less forward friction...faster....

think of drag'in a brick around the yard....

that is positive caster.

now think of pushing a brick around the yard.

that is negative.

hoosier transplant
Dirt Maniac

Total posts: 104
posted January 21, 2005 07:34 PM  
You're right about the friction. One thing, also, that you have to remember is that negative caster will actually unload the diagonally rear wheel when you turn the steering. Positive will raise the spindle and transfer more weight to diagonal rear tire. Of course if you go too far with the caster it also takes more effort to turn steering in the direction of the wheel that has a lot of caster. I think some drivers that have problems with power steering going out might trace that back to having too much caster and overworking the powersteering pump. And you might say, "I'll put more positive caster in left than right so I can get more bite in rr", but that would greatly hinder you going into the turn. It's a tradeoff-either get in good or get out good- and that is where the happy medium comes for the caster settings. One last thing, set your caster before you set camber because the caster will change your camber settings.

LAY74
Dirt Full Roller

Total posts: 74
posted January 24, 2005 06:43 AM  
Transplant has the right idea. I run on a 3/8 mile flat and have a 3-1/2 degree split.
rf 4 1/2 lf 1 it works great. Turns for itself.

    

Back to the Archives