My '67 has the same setup and I am using a Cadillac Cetara PS pump rated to 110bar (1595psi) according to an online page.
I know for sure that a early ford, saginaw, fox and power pump will not work, those i tried before.

Mustsed

Mustsed wrote:

My '67 has the same setup and I am using a Cadillac Cetara PS pump rated to 110bar (1595psi) according to an online page.
I know for sure that a early ford, saginaw, fox and power pump will not work, those i tried before.

Mustsed

 
Through CVF I only have the option of a GM pump or a Saginaw pump.   

I’ll reach out to that place and see if they can confirm the psi.

Last edited by RTM (4/26/2022 11:45 AM)

Thought I should update my post.  After speaking with Hydra Tech they said the Saginaw pump will work fine with the hydro boost and not be to much for the rack and pinion steering unit.

xrracer wrote:

Relief pressure is 1200-1380 psi

Thanks for the info.

FYI, the Sagniaw pumps can be shimmed to alter their pressure output.  There's a kit from Borgesson to do this.  Here's a link:

https://www.jegs.com/p/Borgeson/Borgeson-Pressure-Reducing-Kit/2882650/10002/-1?gclid=Cj0KCQjw1tGUBhDXARIsAIJx01nZ-Q_VFJDDdNM6hwGZmY0xtvV1v8z4DYUYJpojMcZHcJDmWn-KZFQaAlZjEALw_wcB


IMO the Sagniaw pump is a far better pump to any Ford pump.  I've replaced probably half a dozen Ford pumps over the years and exactly one Saginaw one.  Those Saginaw pumps were also used on AMC, Jeep, and other products. 
 

Perhaps Lee Power Steering might be able to help you dial in your combo.

They have a Ford style pump with Saginaw internals.

Figured I would mention them, since they rebuild pumps and gearboxes as well.

BobE wrote:

Check the Borgeson pressure shim kit #899001 kit, it lists the impact of each shim on output pressure of the pump. 
Instead of the CVF kit, maybe Hyrdotech, or another vender, can provide the specific components you need. 

Below is from the Borgeson Shim kilt Instructions:
The Following Chart is for reference only different pumps may vary pressures.
Mustang Rack and Pinions generally require Approx 1000 PSI.
No Shims 1350PSI
1 Shim 1200PSI
2 Shims 1100PSI
3 Shims 1000PSI
4 Shims 850PSI
5 Shims 700PSI
 

I'm not sure I follow you.  I already know the requirements of the 2003 cobra mustang hydroboost and the operating pressure of the steering rack.  The only thing I do not know is the gpm requirements of the rack which I'm told and read, is the main factor in the sensitivity of the steering.    The output pressure and gpm of the Saginaw pump is right on with the factory pump used on the 03 cobra mustangs.  I do not want to change the numbers going into the hydroboost unit but may need to adjust the gpm after the hydroboost unit for the steering feel.

My braking system is all 2003 cobra brakes front and rear with the matching hydrboost.  The only variable is the MII rack and pinion unit which only requires 1,000-1,100 psi and again I do not know the gpm of the rack.  What I have been told is once you get over the 2.6 range or even at the 2.6gpm the rack may feel to sensitive.  The rack appears to be happier around 2gpm which I need to confirm with R&C.

What I do not know is can the factory 2003 hydroboost function at a lower psi and or lower gpm while suppling what's needed for the power steering rack.  That's how I ended up with picking the Saginaw pump which looks to match the specs of the 2003 PS pump and then adding the flow reducing control valve after the high pressure line leaves the hydroboost unit.

I need to stay within the CVF kit because I want to run their complete bracket system.  I understand I can perform mods to the pump but no one can confirm the affects on the braking and steering system I have mentioned above.  I have been talking to Jim at Hydratech and he has been very helpful.   But Jim won't even say for sure if I can get away with lower pressure and or gpm.  Jim does say how and what his system needs to work with my steering but won't say exactly what will work with my current set up.  Jim keeps referring to the gpm of the rack which I do not know yet.  Jim also leans towards more pressure for the hydroboost but I would guess that is what is needed or can be used with his systems.

Nos681 wrote:

Have you checked with any Pro-touring groups?

I bet someone has already done it there.

 
That’s where I had read the most about adding the adjusting valve to control flow to the rack and pinion steering.

BobE wrote:

RTM - I’d suggest checking with the “Unisteer” tech people for assistance with the GPM question of your specific R&P.

 
I will call R&C first and see if they know the specs of the rack they sell.   I already that the 2.6 gpm from the Saginaw pump may be to much and the hydroboost is happy at 2.6.  So any information I get from here on out is only going to affect wether I need the inline adjuster for the gpa.   I don’t even know what model rack I have so I’m not sure Unisteer can help unless they know what rack R&C sells.

BobE wrote:

The rack that came with the R&C MII front suspension kit installed on my 65 uses a R&P from an 88-93 Fox Body Mustang.  As the steering was ‘touchy’ I contacted Unisteer to find out what they recommend the pressure should be, they suggested to reduce it from the 1200psi to 1000psi.  I made the change, the steering touchiness went away, and the hydroboost that I added, five years later, works quite well.   The Borgeson shim kit makes it easy to change pressures to what one is comfortable driving with.
 

 
That’s great information. I haven’t had a chance to call R&C. To busy studying.

After posting a quick reply I failed to realize that I know I can adjust the pressure but the lower pressure may affect how the hydroboost unit acts.  That's the one thing I can have gotten a straight answer on yet is how thew HB will act if it sees lower pressure.

Last edited by RTM (6/03/2022 10:16 AM)