Power steering pumps and reducers
Thread Starter
Teching In
Joined: Mar 2025
Posts: 2
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Power steering pumps and reducers Hey guys,
What's the best spot to purchase a power steering reducer? I have an 05 CTSV powertrain in a 91 240sx hatch and the pump sends 1500-1700psi where my rack wants 1100-1200psi. (similar to f-body numbers I believe)
The fear is blown rack seals and bad road feedback. Pump whines a bit under normal use. similar to when you're at full extension or when PS fluid is low.
Are guys running just a reducer? or a reducer and undersized pulley at the PS pump? I've been searching, and it seems like there is a divide. Some say its not an issue, some say they dont know why they keep blowing seals, others say reducer, and others swear by reducer and undersized pulley on every swap they do.
Any info to help would be awesome.
-Adam
What's the best spot to purchase a power steering reducer? I have an 05 CTSV powertrain in a 91 240sx hatch and the pump sends 1500-1700psi where my rack wants 1100-1200psi. (similar to f-body numbers I believe)
The fear is blown rack seals and bad road feedback. Pump whines a bit under normal use. similar to when you're at full extension or when PS fluid is low.
Are guys running just a reducer? or a reducer and undersized pulley at the PS pump? I've been searching, and it seems like there is a divide. Some say its not an issue, some say they dont know why they keep blowing seals, others say reducer, and others swear by reducer and undersized pulley on every swap they do.
Any info to help would be awesome.
-Adam
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Since a typically PS pump will already create max pressure at relatively low RPM, an undersized pulley won't help.
I don't know what specific PS pump you have, but many have springs or shims which can be changed to regulated pressure. They are located under the high pressure fitting.
I don't know what specific PS pump you have, but many have springs or shims which can be changed to regulated pressure. They are located under the high pressure fitting.
Thread Starter
Teching In
Joined: Mar 2025
Posts: 2
Likes: 0
Since a typically PS pump will already create max pressure at relatively low RPM, an undersized pulley won't help.
I don't know what specific PS pump you have, but many have springs or shims which can be changed to regulated pressure. They are located under the high pressure fitting.
I don't know what specific PS pump you have, but many have springs or shims which can be changed to regulated pressure. They are located under the high pressure fitting.
