full hydro steering setup.

Hey

Gen 1 raptor 6.2L highly modified

I have a raptor at our shop that has a baja kits long race kit. the truck has a full hydro setup running in it. Now i havent done steering work before, but from my limited experience i know it isnt ideal or even really safe to run full hydro on a race setup... That aside id like to fix the minor issues first.

The truck has some horrible bump steer. I thought it may be related to the hydro setup and ram size.
I measured the eye to eye and got these results.

Hydro Rack - 680mm
Standard Rack - 930mm
tie rods - 500mm

So there is a good 250mm of difference in the rack length. which would make the tie rods 125mm longer than standard and the geometry would be different.

Does anyone know if this would be causing the bump steer.

Thanks Jake

Is this a full hydro setup or a hydro assist (i.e. is there physical linkage from steering wheel to axle or does the wheel go to a pump, sometimes with a shaft sometimes not, and then from the pump to the axle are only hoses that go to the cylinder that's mounted on the axle...no steering box on the frame)? Full hydro is a standard for racing. One of the biggest benefits is the feedback won't rip the steering wheel out of your hands if you hit a rut/rock/whatever. If it's hydro assist it's much more susceptible to bump steer. The bump steer is usually caused by incorrect geometry (toe, caster, camber, etc). Having full hydro will prevent bump steer from suspension cycle, hydro assist will not stop that.

Sorry, I know this thread is a little old, hopefully you got it figured out.