Powersteering Flow Mods
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Cargo Master
Joined: Nov 2010
Posts: 3,244
Likes: 40
Powersteering Flow Mods
Hey guys,
Just wondering if anyone here has drilled out the orifice/pressure hole in the pressure fitting in the PS pump?
I hear about "driving like a caddy" is that not a good thing? Apparently it is a reference to no feedback from the road. I'm not exactly sure what this means? Wouldn't awesome power steering like that be a good thing?
I've done a lot of searching on it and it appears that stock hole is 1/8, and it is suggested to go 1-2 sizes above. Which would be 9/64, or 5/32.
Thanks
Just wondering if anyone here has drilled out the orifice/pressure hole in the pressure fitting in the PS pump?
I hear about "driving like a caddy" is that not a good thing? Apparently it is a reference to no feedback from the road. I'm not exactly sure what this means? Wouldn't awesome power steering like that be a good thing?
I've done a lot of searching on it and it appears that stock hole is 1/8, and it is suggested to go 1-2 sizes above. Which would be 9/64, or 5/32.
Thanks
Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
Short answer... I haven't ever seen any reports of anyone doing that as the sole modification. When I've read about PS upgrades, I see folks moving to the Saginaw P-style pumps which produce higher flow rates and often use a remote reservoir in place of the attached one. You can convert to the P-style pump with either tank configuration. Regardless, part of their "upgrade" is related to the higher flow rates and less restriction, but the trick with the remote reservoir is to make sure that it can both feed enough fluid to the pump suction while also handling the much higher velocity and volume of fluid coming back into it from the pump discharge.
Like I said, I've not seen yet any reports of just drilling out the existing restriction as the only modification. If you do that, you'll still need to make sure that the existing reservoir ports to the pump suction will handle enough fluid flow to prevent pump cavitation, which causes fluid foaming, which worsens the pump cavitation.... and on and on and on it spirals downward.
Like I said, I've not seen yet any reports of just drilling out the existing restriction as the only modification. If you do that, you'll still need to make sure that the existing reservoir ports to the pump suction will handle enough fluid flow to prevent pump cavitation, which causes fluid foaming, which worsens the pump cavitation.... and on and on and on it spirals downward.
Postmaster
Joined: Dec 2010
Posts: 2,951
Likes: 4
From: Gary,Indiana
Short answer... I haven't ever seen any reports of anyone doing that as the sole modification. When I've read about PS upgrades, I see folks moving to the Saginaw P-style pumps which produce higher flow rates and often use a remote reservoir in place of the attached one. You can convert to the P-style pump with either tank configuration. Regardless, part of their "upgrade" is related to the higher flow rates and less restriction, but the trick with the remote reservoir is to make sure that it can both feed enough fluid to the pump suction while also handling the much higher velocity and volume of fluid coming back into it from the pump discharge.
Like I said, I've not seen yet any reports of just drilling out the existing restriction as the only modification. If you do that, you'll still need to make sure that the existing reservoir ports to the pump suction will handle enough fluid flow to prevent pump cavitation, which causes fluid foaming, which worsens the pump cavitation.... and on and on and on it spirals downward.
Like I said, I've not seen yet any reports of just drilling out the existing restriction as the only modification. If you do that, you'll still need to make sure that the existing reservoir ports to the pump suction will handle enough fluid flow to prevent pump cavitation, which causes fluid foaming, which worsens the pump cavitation.... and on and on and on it spirals downward.
But I won't mind hearing first hand from someone who has done this mod and hear the results.
Tuned
Joined: Jan 2008
Posts: 294
Likes: 16
From: Kamloops, BC. Canada
This mod is pretty old and was done back in the hay days of TDS. I've done it on two trucks and has been best on my '96 F350 4x4 cclb srw. As noted above the feed back "feel" will be diminished, read '70's land yaught or so I've been told, if you go too big. For my 96 I drilled the pressure port bushing hole iirc 1 drill bit size larger sorry I don't remember actual size. It didn't seem to make a huge change so went one more size and it made the steering feel much better as I recall. Seems to me on my '97 sig truck it didn't make a significant difference.
On my new truck '96 F250 ECSB 4x2, I'll be doing this mod when it warms up here. It's easy to do and is a good mod I think.
Sorry guys I just realized..... I can only speak for OBS trucks.
jrc
On my new truck '96 F250 ECSB 4x2, I'll be doing this mod when it warms up here. It's easy to do and is a good mod I think.
Sorry guys I just realized..... I can only speak for OBS trucks.
jrc
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