Thread: RR PS Pump Limits Reached (Update: Hose Ripped)

Looks like Roller Rocker PS Pump's don't appreciate revving to 8300rpm weekly. Mine went out today, loud whiney noise, PS fluid all over the reservoir with a bunch of air bubbles.

RR redline is only 6700 rpm, so Nissan might have went cheap on the pumps. Thus going to an older pump might help...


EDIT for easier searching

Issue PS HP line bursted and from overpressure.


Solution:

Oh boy. Don't tell me this days before I take my RR PS pump up there!! Do you know if you were running low on fluid or not? Wonder if that might have affected things?

you do use ATF in your power steering right?

my dumb ass used the regular stuff an my pump whines.. been meaning to change it for quite some time.

That sucks Vadim, but who needs powersteering anyways... J/k

Question: how can you be sure that revving to 8300 caused PS failure? What other things can cause PS Pump failure?

When you say "older style" PS pump, which ones are you referring to?

^ He is referring to older SR20DE PS pumps. Older DE's revved to between 7100 and 7500 RPM (depending on year) so the pump might have been more capable of handling those revs.

i used the VE pump, i wonder if its the same as the RR pump?

Are the older style pumps really different pumps than rr pumps?

They are heavier/beefier according to the weights and so are the pulleys. I am not sure how it translates into revs though. Specifically, in regards to the pump design itself.


Vadim, I did dome digging. It appears as though the G20 P11's have the same PS pulley as the JDM SR20VE. Same pulley, same number and same weight. The 98-99 P11's have a different PS pump than the 00+ p11's and both have a different part # than the JDM SR20VE. The JDM VE pump weighs in at 2700 grams. The P11 ('98-'99) PS pump also weighs in at 2700 grams. The P11.5 ('00+) PS pump weighs in at 2680 grams. It is the lightest and maybe(??) the least-heavy-duty out of all of the PS PUMPS, including P10, B13, B14 and even B15 RR pump as well. It is probably pretty darn close to the VE pump though as the pulley is the same pt. # and the pumps are virtually identical in weight. The B13 pump, for instance is, is the heaviest at 3700 grams. The B13 pulley is also the heaviest as well.

Not sure how all of this translates into revs but you have the same pulley as the JDM VE and the pump appears to be very similar if not the same (early P11 anyways).

It looks like Nissan not only lightened the crankshafts and the pistons in the RR engines but also the pump/pulley hardware. All for the sake of emissions and vehicle weight savings, I would think. Give them a wimpy cam profile/lower redline because of emissions and the need for low-end tq. but try and make up for it by lightening the crank, pistons and pulleys. Seems so I think!?

I have some more pulley info to post up. I will do it here, tomorrow. http://www.sr20-forum.com/general-sr20/47838-pulley-info.html

Walked outside today to a puddle PS oil, that didn't seem right... Open the hood and started digging around. It seems like the PS pump itself might be fine actually! But the hose is another story....

(You can see a tiny little hole almost at the hose clamp)


Basically the overpressure of revving to a much higher RPM cause the hose to give out. Once again probably because RollerRocker parts are not meant to be revved above 6700 rpm.

I'm looking into replacement options, like a steel braided options .




I'm using regular PS fluid, I have a few cans on of it and have to use it up. It works fine, no whine.

yeah, those High Pressure power steering are notoriously weak...

But i'm not so sure it was your VE revving to 8300 that caused it. High Pressure power steering lines are known to be weak even on stock RR's and Non RR SR's.