Power steering with megasquirt
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Joined: Feb 2012
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From: lima ohio
Power steering with megasquirt
so i just put my power steering back on and in the process of installing my megasquirt i trimmed off and re used some of the connectors that i thought i wouldn't need, the power steering connectors were two of them. so I tried running without anything connected and all seemed fine but now it sounds like my pump is bad. Im just wondering, do I need to wire the power steering computer back in? or did my pump just go bad on its own because when it first started it seemed like there wasn't as much assist as there should have been.
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
This is fresh in my mind because I've been looking at an FC power steering pump for my Cosmo.
The power steering ECU takes input from the ECU (RPM) and vehicle speed sensor (in the cluster). Fairly sure '87s have speed sensing power steering, later cars use RPM and speed.
Long story short, there is a stepper motor in the pump which controls fluid pressure. Without the ECU, that stepper is locked in one position resulting in either too much or too little boost to the steering. I recall seeing some instructions YEARS ago for opening the pump regulator assembly up and manually locking the position of the stepper at a happy medium, however that was easily 10 years ago and I can't find them off hand again.
However, are you sure you just aren't low on fluid? The pump will fill all the lines, draining it's small reservoir and then sound like a bag of hammers until you top it off.
The power steering ECU takes input from the ECU (RPM) and vehicle speed sensor (in the cluster). Fairly sure '87s have speed sensing power steering, later cars use RPM and speed.
Long story short, there is a stepper motor in the pump which controls fluid pressure. Without the ECU, that stepper is locked in one position resulting in either too much or too little boost to the steering. I recall seeing some instructions YEARS ago for opening the pump regulator assembly up and manually locking the position of the stepper at a happy medium, however that was easily 10 years ago and I can't find them off hand again.
However, are you sure you just aren't low on fluid? The pump will fill all the lines, draining it's small reservoir and then sound like a bag of hammers until you top it off.
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
With some creative Googling I found the info...
AusRotary.com • View topic - FC power steering questions?
In that topic there are some instructions for manually adjusting the pump.
Also info on using an MR2 electric PS pump (not recommended unless you have an upgraded alternator).
AusRotary.com • View topic - FC power steering questions?
In that topic there are some instructions for manually adjusting the pump.
Also info on using an MR2 electric PS pump (not recommended unless you have an upgraded alternator).
this should probably be combined with this thread:
https://www.rx7club.com/2nd-generati...t-ecu-1044887/
https://www.rx7club.com/2nd-generati...t-ecu-1044887/
This is fresh in my mind because I've been looking at an FC power steering pump for my Cosmo.
The power steering ECU takes input from the ECU (RPM) and vehicle speed sensor (in the cluster). Fairly sure '87s have speed sensing power steering, later cars use RPM and speed.
Long story short, there is a stepper motor in the pump which controls fluid pressure. Without the ECU, that stepper is locked in one position resulting in either too much or too little boost to the steering. I recall seeing some instructions YEARS ago for opening the pump regulator assembly up and manually locking the position of the stepper at a happy medium, however that was easily 10 years ago and I can't find them off hand again.
However, are you sure you just aren't low on fluid? The pump will fill all the lines, draining it's small reservoir and then sound like a bag of hammers until you top it off.
The power steering ECU takes input from the ECU (RPM) and vehicle speed sensor (in the cluster). Fairly sure '87s have speed sensing power steering, later cars use RPM and speed.
Long story short, there is a stepper motor in the pump which controls fluid pressure. Without the ECU, that stepper is locked in one position resulting in either too much or too little boost to the steering. I recall seeing some instructions YEARS ago for opening the pump regulator assembly up and manually locking the position of the stepper at a happy medium, however that was easily 10 years ago and I can't find them off hand again.
However, are you sure you just aren't low on fluid? The pump will fill all the lines, draining it's small reservoir and then sound like a bag of hammers until you top it off.
Do you know if the later cars work with just speed (no rpm) input?
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