PS Fluid flush?

[Stardust]

edited by S

[92GTSTproject]

the quality of your fluids directly affects the reliability of its respective purpose

[Skym]

Go to Nissan dealership and buy genuine Nissan powersteering fluid. There are machines that can drain old fluid, refill with new fluid (might have to turn wheel to move the fluid through powersteering system and to remove any bubbles). They use those machines on auto transmissions, but I remember there is a powersteering version of this machine.

No HICAS means less heat in fluid. The stock powersteering cooler (loop of hardpiping infront of radiator, etc) is needed due to the long distance of hoses, hardpiping (going to and from HICAS rack, etc).

But on racetrack engine bay could get hot due to engine, etc and hoses, fluid get that radiant heat, so need a tube and fin Nismo powersteering oil cooler (same powersteering oil cooler as used on 350Z, 370Z???, R35GTR, etc). Or aftermarket version.

[Voodoo_ChildR32]

The stock system does "spit" all over. Last track day I had a bit of a mess on that side of the engine bay. I still have the HICAS system in place.


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[Skym]

This is the machine you use -

http://www.youtube.com/watch?v=fhHha6IEnoE

Another machine, same thing (doesn't show moving the steering wheel) -

http://www.youtube.com/watch?v=duyOiUGFStQ

The stock hose clamps on powersteering hoses are not strong enough (causes leaks). Nissan dealership I talked to recommended to switch to worm drive intake hose clamps to solve this problem (common problem, even my car had leaking on both sides of engine bay and switched to worm drive intake hose clamps to fix it). In some cases the hoses need to be replaced due to age, especially if engine bay got very hot on racetrack (might be worth running braided hoses or high temp hoses if near hot engine).

If going to use car on racetrack, look at heat rating of powersteering fluid (From what I understand, it should be Dexron fluid and there's Dexron I, Dexron II, Dexron III, the new Dexron IV fluid, or something like that and are rated differently with temps, Dexron III is used in auto transmissions). Motul is what most would use (Nismo use Motul fluids in engine, etc).

Genuine Nissan powersteering fluid bottle looks like this -

http://www.thenismoshop.com/Nissan-Factory-OEM-Power-Steering-Fluid--999MP-AG000P_p_54.html

[92GTSTproject]

look for something with detergents, anti foaming agents and conditioners, i have my hicas line looped for extra circulation it helped quite a bit for the spiting fluid but only does so much for so long

[Skym]

From what I understand, both auto trans, powersteering fluid are the same fluid (Dexron fluid and as far as I know, Dexron III is what the autotrans on R32 to R34 Skylines run), but some brands of ATF have additives to protect seals, etc inside powersteering rack, pump, etc (I would use genuine Nissan powersteering fluid that has these additives).

Do you mean thermal expansion of the fluid causing the leaks??? I found out it's just the hose clamps are not strong enough. But thermal expansion might be the actual cause of the leaks.

[92GTSTproject]

yes thermal expansion and foaming/airation of the fluid, a more expensive fluid will have additives to combat these effects

[Skym]

I was told you fill to a certain level in resouvoir to take into account the thermal expansion. But the additional powersteering oil cooler must play a role in how much the fluid expands and must expand more on racetrack than on road due to radiant heat from engine.

[92GTSTproject]

its about the same because of the cooler but it would be simpler to run a non power rack for racing as it helps the "feel of the road" transfer through the wheel OR an A/M PS resivior as where drifting would be good with power rack but usually coolant temps go up before that happens on a drift car so cool down time is needed lol