Hydro-Assist

Post by **joshy** » Wed Sep 02, 2009 5:00 pm

With Hydro Assist steering, will the wheels still turn if you take the draglink off? If not, is there away to make it so it runs with a draglink onroad and without one off road?

Cheers, Josh

Post by **BUSTED100** » Wed Sep 02, 2009 5:49 pm

joshy wrote:With Hydro Assist steering, will the wheels still turn if you take the draglink off? If not, is there away to make it so it runs with a draglink onroad and without one off road?

Cheers, Josh

I don't think it would steer straight, wheels would turn indepentantly without draglink

Post by **Micka** » Wed Sep 02, 2009 6:10 pm

What he wants is a hydro-assist for on road that can be worked as a full hydro off road.

Can be done, but I have no idea of how. I do know who does, but I'm not sure that they will want me to post it.

He will probably chime in anyway.

If you search hydro assist or full hydro you will come across it.

Post by **1MadEngineer** » Thu Sep 03, 2009 1:53 pm

short answer - possible but expensive to do! ~$2k-3k if you are paying someone.

first you have to understand how a std PS box works. Although it act 'like' an orbital, it needs deflection on the bar to create a command pressure.... so its not fixed displacement (this is a problem) If you put an inline orbital on the shaft it IS fixed displacement. And as the screw-sector are still connected you only have a set amout of rotations to get the steering output. SO the inline orbital would have to be huge (CC/rev) or a tiny ram otherwise you won't have any steering lock. Yes there are ways around it but nothing pretty or comercially available bolt on.
there ae better ways around this

Post by **Micka** » Thu Sep 03, 2009 3:31 pm

^^^
That was who I was referring to.

Post by **lay80n** » Thu Sep 03, 2009 4:20 pm

BUSTED100 wrote:
joshy wrote:With Hydro Assist steering, will the wheels still turn if you take the draglink off? If not, is there away to make it so it runs with a draglink onroad and without one off road?

Cheers, Josh
I don't think it would steer straight, wheels would turn indepentantly without draglink

Tie rod joins wheels together, drag link joins tie-rod/knuckle to steering box.

Layto....

Post by **joshy** » Thu Sep 03, 2009 4:26 pm

1MadEngineer wrote:short answer - possible but expensive to do! ~$2k-3k if you are paying someone.

there ae better ways around this

Cheers, im open to suggestions?

Post by **11_evl** » Thu Sep 03, 2009 5:32 pm

buy my orbital off me and go full hydro

Post by **joshy** » Thu Sep 03, 2009 6:06 pm

cant get full hydro engineered or i would. Mechanical steering wont have enough movement offroad so im hoping theres a way to run both.

Post by **Weiner** » Thu Sep 03, 2009 6:28 pm

joshy wrote:cant get full hydro engineered or i would. Mechanical steering wont have enough movement offroad so im hoping theres a way to run both.

Get it registered as a tractor and don't go over 40km/h or whatever it is

Post by **joshy** » Thu Sep 03, 2009 9:20 pm

yeah ill just head everywhere in peak hour so i cant go over 40

Post by **Willy Hilux** » Thu Sep 03, 2009 11:46 pm

Why not go hydro assist with quick disconnect fittings. When I the highway have them disconnected from the ram and when out 4x4ing just connect them up again. You will have to get a small hose made up to connect the two fittings on the ram together when on the highway. This then will act as a steering dampener.

Or you could have the disconnect fittings on your box and just buy a f/f adaptor to join the two hoses together when on the highway.

Easy done.

Post by **Z()LTAN** » Fri Sep 04, 2009 12:42 am

Willy Hilux wrote:Why not go hydro assist with quick disconnect fittings. When I the highway have them disconnected from the ram and when out 4x4ing just connect them up again. You will have to get a small hose made up to connect the two fittings on the ram together when on the highway. This then will act as a steering dampener.

Or you could have the disconnect fittings on your box and just buy a f/f adaptor to join the two hoses together when on the highway.

Easy done.

lol good idea mate.

Looks like someone actually understands hydraulics lol

Post by **1MadEngineer** » Fri Sep 04, 2009 8:14 am

Z()LTAN wrote:
Willy Hilux wrote:Why not go hydro assist with quick disconnect fittings. When I the highway have them disconnected from the ram and when out 4x4ing just connect them up again. You will have to get a small hose made up to connect the two fittings on the ram together when on the highway. This then will act as a steering dampener.

Or you could have the disconnect fittings on your box and just buy a f/f adaptor to join the two hoses together when on the highway.

Easy done.
lol good idea mate.

Looks like someone actually understands hydraulics lol

or just use a 6port divertor valve

Post by **joshy** » Sat Sep 05, 2009 4:20 pm

Post by **ledgend80** » Sat Sep 05, 2009 5:02 pm

beg to differ about the 40km/hr look at a franna crane not restricted to 40 they will do 80 to 90 km/hr full hydro steer but they have an emergency back up so if you loose hydraulic pressure an electric pump cuts in and you can still steer but these machines have special rego but if they can maybe you could somehow but getting it engineered alone would cost you

Post by **HANCOCK** » Sat Sep 05, 2009 5:56 pm

If set up correctly shouldn’t you get the same amount of steering from the p/s box and the assist ram as the knuckles will bind? Or am I missing something?[/quote]

Post by **Micka** » Sat Sep 05, 2009 8:29 pm

Some orbitals combined with different rams will react far differently to a P/S set up. They don't always react in the same time frame. This can be disasterous at speed when you are swerving an obstacle and the steering reacts about 2 seconds after you need it to.

Post by **HANCOCK** » Sat Sep 05, 2009 8:59 pm

I have a Yuri built assist ram modified p/s box and holden pump and its great its faster now then it was before...

Post by **Micka** » Sat Sep 05, 2009 9:04 pm

Yes...but assist and full hydro are 2 very different animals.

Post by **CWBYUP** » Sun Sep 06, 2009 8:50 pm

joshy wrote:cant get full hydro engineered or i would. Mechanical steering wont have enough movement offroad so im hoping theres a way to run both.

From memory your building a D22 STR with GQ diffs ?

Why not just the whole GQ set up ? P/S box Drag link etc ?

Will make it easy when you bend stuff.

Nick

Post by **joshy** » Sun Sep 06, 2009 11:08 pm

CWBYUP wrote:
joshy wrote:cant get full hydro engineered or i would. Mechanical steering wont have enough movement offroad so im hoping theres a way to run both.
From memory your building a D22 STR with GQ diffs ?

Why not just the whole GQ set up ? P/S box Drag link etc ?

Will make it easy when you bend stuff.

Nick

D22 with gu diffs with hydro coil overs. normal powers steering and draglink wont have enough movement offroad. looking at 28" of travel at least...

Post by **MUD000** » Mon Sep 07, 2009 7:24 am

I have hydro assist on my ute & it works fine on & off road

Took a bit to get it sorted but works fine
Factory 79 series ps box with tapping & modified flow valve
Cheers Dan

Post by **joshy** » Mon Sep 07, 2009 4:20 pm

MUD000 wrote:I have hydro assist on my ute & it works fine on & off road
Took a bit to get it sorted but works fine
Factory 79 series ps box with tapping & modified flow valve
Cheers Dan

Yeah, but you still run a draglink?

Post by **Willy Hilux** » Mon Sep 07, 2009 4:31 pm

Why don't you want to run a draglink???

Post by **joshy** » Mon Sep 07, 2009 4:36 pm

i want to run one on road but not offroad as it wont have enough movement

Post by **Willy Hilux** » Mon Sep 07, 2009 7:59 pm

joshy wrote:i want to run one on road but not offroad as it wont have enough movement

Not enough movement where?? in the ball joints?? if so you could try rod ends..... I had them on my lux and worked well.

Post by **1MadEngineer** » Mon Sep 07, 2009 9:36 pm

there is a LOT of information missing? please fill in the blanks so we can help. what suspension? what ride height? and budget?

getting a tierod to work with ~25" of travel is easy, but there is a right and a wrong way. most of it is dependant on your suspension geometry and the rest is in the manufacturing.

Post by **joshy** » Mon Sep 07, 2009 9:43 pm

OPW racejacker 14" hydro coilovers.

the hydro lift...and then theres the coilover travel itself.

ride height im still playing around with, coilovers will probably be 6" extended. And budget..well that depends on what its going to cost me to do it so i can drive it on and offroad.

Post by **1MadEngineer** » Mon Sep 07, 2009 9:46 pm

sorta more chasing - 3/4/5link or radius arm / panhard or not?? (lift height compared to a stock vehicle) so we can get an idea of the vertical drop from the steering box to the axle centerline??

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