Power steering pumps
04-21-19, 03:56 AM
#1
Power steering pumps
Hey all,
During my rebuid I decided I'd rather die than keep the ugly, high mounted, dual pulley FC PS-pump. Well, turns out I haven't got the ideal ratio rack for that. So while I am going through with the idea, I figured it'd be good to have a plan B.
I was wondering; are PS pumps interchangeable? I guess not due to operating pressures / volumes but any real mechanic wanna come confirm that? Secondly; has anyone used a different, smaller pump that can be cleanly installed to NOT stick out like a sore thumb?
Lemme know!
During my rebuid I decided I'd rather die than keep the ugly, high mounted, dual pulley FC PS-pump. Well, turns out I haven't got the ideal ratio rack for that. So while I am going through with the idea, I figured it'd be good to have a plan B.
I was wondering; are PS pumps interchangeable? I guess not due to operating pressures / volumes but any real mechanic wanna come confirm that? Secondly; has anyone used a different, smaller pump that can be cleanly installed to NOT stick out like a sore thumb?
Lemme know!
04-21-19, 09:55 AM
#2
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interchangeable with what? the FC used 2 different pumps.
the majority of the cars used the variable assist style pump, its identifiable because it has 3 lines, its unique to the FC. its paired with the 15:1 steering rack
some of the 1990 and later cars use a more conventional pump, with two lines, and this is just a normal pump, so if you're willing to do a little plumbing, you could use practically any conventional pump. its paired with the 17:1 steering rack
the majority of the cars used the variable assist style pump, its identifiable because it has 3 lines, its unique to the FC. its paired with the 15:1 steering rack
some of the 1990 and later cars use a more conventional pump, with two lines, and this is just a normal pump, so if you're willing to do a little plumbing, you could use practically any conventional pump. its paired with the 17:1 steering rack
04-25-19, 02:25 AM
#3
interchangeable with what? the FC used 2 different pumps.
the majority of the cars used the variable assist style pump, its identifiable because it has 3 lines, its unique to the FC. its paired with the 15:1 steering rack
some of the 1990 and later cars use a more conventional pump, with two lines, and this is just a normal pump, so if you're willing to do a little plumbing, you could use practically any conventional pump. its paired with the 17:1 steering rack
the majority of the cars used the variable assist style pump, its identifiable because it has 3 lines, its unique to the FC. its paired with the 15:1 steering rack
some of the 1990 and later cars use a more conventional pump, with two lines, and this is just a normal pump, so if you're willing to do a little plumbing, you could use practically any conventional pump. its paired with the 17:1 steering rack
Something like this would be epic, but it's got two lines
04-25-19, 09:25 AM
#4
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86 will have the 3 line pump, its the only car on the planet with a system like that
04-30-19, 08:15 PM
#5
Rotary Freak
And since we're on the topic, is switching to a two line pump as simple as blocking the extra port?
Thanks, Chris.
05-01-19, 09:20 AM
#6
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part of what makes the FC the highest tech car of 1986-1987, its only eclipsed by the BMW 750il in 1988...
http://foxed.ca/rx7manual/manuals/Tr...ing_System.pdf
http://foxed.ca/rx7manual/manuals/Tr...ing_System.pdf
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mysikrx7 (06-04-20)
05-02-19, 08:59 PM
#7
Red Pill Dealer
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I found this thread searching "three port steering racks". It is more about the pump but, maybe helpful.
https://www.rx7club.com/2nd-generati...-port-1038453/
From post #2.
Here's the search results.
https://www.rx7club.com/search.php?searchid=15543680
https://www.rx7club.com/2nd-generati...-port-1038453/
From post #2.
I havent seen too many 2 port racks...
This might be useful or not. I ran a standard "single out" pump with my miata swap (the stock one) with a 3 hole rack. At first i plugged on hole, and ran the pump into the other. This provided about NO power at all. Steering felt like it did with the car off. Then i switch the inlet and outlet so that i ran powersteering into the top most inlet and this gave me awesome powersteering.
Not really sure what the other inlet does... either its extremely fine (but seriously felt like no powersteering at all) or it acts as a bypass for the pump to vary the pressure.
sidenote: the 3 hole racks are faster ratio!
This might be useful or not. I ran a standard "single out" pump with my miata swap (the stock one) with a 3 hole rack. At first i plugged on hole, and ran the pump into the other. This provided about NO power at all. Steering felt like it did with the car off. Then i switch the inlet and outlet so that i ran powersteering into the top most inlet and this gave me awesome powersteering.
Not really sure what the other inlet does... either its extremely fine (but seriously felt like no powersteering at all) or it acts as a bypass for the pump to vary the pressure.
sidenote: the 3 hole racks are faster ratio!
Here's the search results.
https://www.rx7club.com/search.php?searchid=15543680
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01-31-20, 09:41 AM
#9
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why? the FC system is well documented in the FSM,
http://foxed.ca/rx7manual/manuals/Tr...ing_System.pdf
the 1990-1991 base/verts had a more conventional system with a 17:1 ratio instead of 15:1. the pump will have 1 pressure line instead of two
http://foxed.ca/rx7manual/manuals/Tr...ing_System.pdf
the 1990-1991 base/verts had a more conventional system with a 17:1 ratio instead of 15:1. the pump will have 1 pressure line instead of two
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