RA28 + MX73
Join Date: Mar 2006
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I think you have a conflict.
Off-road racing requires long, soft suspension travel, tyres with shock absorbing capbility and tyres with the ability to bite into loose gravel.
This implies that you need tall springs, high profile tyres and narrow tyres.
Lowered suspension will give you trouble on every bump, ridge or hollow.
This could causing the car to bottom out and scrape along the ground.
It can also cause the springs to bottom out - feeding a sudden shock into the chassis and causing the wheels to suddenly lose grip - bad when cornering!
Stiff springs are also bad because they feed sudden shocks into the chassis (with attendant wheel grip loss).
Likewise for stiff shock absorbers.
Low profile tyres have the same problem as stiff springs.
Wide tyres effectively spread the weight of the car across a larger area.
Sounds good but this also means the pressure on each square inch of the ground is reduced.
When going across gravel, loose stones, sand, etc this makes it easy for the car to simply skid across the road with no traction at all.
Narrow tyres will instead concentrate the grip in a small area and use the weight of the car to bite down through the loose layer and into the solid ground underneath.
Big brakes are of course always good.
In short, off-road racing requires the opposite of bitumen racing.
I would keep to the standard size of springs and tyres.
Get tyres with a knobbly tread.
Get adjustable shock absorbers.
Get stiff anti-roll bars.
Get a 3-point suspension tower brace in the engine bay and possibly in the rear.
Add a thick sump guard.
Add a roll cage, fire extinguisher and 5-point (or higher if you plan on having children) seat belt.
Join an off-road racing club, ask questions and listen to everything the experts tell you.