Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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MGBV8
Carl Floyd
Kingsport, TN
(3106 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Electric power rack steering
Posted by: MGBV8
Date: November 23, 2016 11:24AM

Since this is THE main thread on EPS/EPAS, I am cross-posting this from the Triumph section thread.
Quote:
Pick your donor car EPS very carefully. Why buy a Bruno box if it's a set it & forget it situation. Fail Safe mode may be all we need for our LBC.
The Bruno controller is needed for the Saturn Vue, Chevrolet Equinox, etc. do NOT have a factory Fail Safe mode built-in in case it is disconnected from the original vehicle's CAN bus system. Fred Key put an oscilloscope on a Bruno & found out that is about all it does, give the Saturn Vue a fail safe mode (with a potentiometer).

According to this tutorial linked below, a Japanese EPS can be used in Fail Safe mode without the need of a Bruno Box & its variable assist.

The Saturn Vue steering does not self-center well (Mike Moor has discovered this, as well). The author suggests that a Toyota Prius electric steering ECU could be used on the Vue to correct this, as they have the same torque sensor.

[www.forabodiesonly.com]



Edited 1 time(s). Last edit at 11/23/2016 12:16PM by MGBV8.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5199 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: Electric power rack steering
Posted by: BlownMGB-V8
Date: November 24, 2016 09:52PM

Dan and I looked up the weights of the Corolla and Prius. About 2500 and 2800 lbs.

Jim


roverman
Art Gertz
Winchester, CA.
(2850 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Electric power rack steering
Posted by: roverman
Date: December 01, 2016 05:45PM

Ok, so what would be the EPS of choice, for a heavier car, say 3,600 lbs ? Thanks, art.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5199 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Electric power rack steering
Posted by: BlownMGB-V8
Date: December 02, 2016 11:34AM

Maybe the Equinox?

The earlier MGB (CB) steering rack has 2.9 turns L-L so for a 2200lb car that'd give us a steering force factor of about 755 which would vary depending on the tires and any suspension mods. The RB MGB with a 3.5 ratio and about 200 lbs more weight comes to 685. The MG-RM at 2700 lbs would be 931. Wider tires will increase this number.

The '05 Corolla at 2500 lbs has 3.4 turns and works out to a factor of 735, a pretty good match for the 2200 lb (CB) MGB. Possibly a good choice for almost any MGB.

Specs for the Prius are all over the place, anywhere from 2.28 to 4 turns depending on the source, and apparently the tire size. You'll just have to check the individual car. If it is 2.28 (15" wheels) the number is 1,228. If 3.02 (16" wheels) the number is 927. Both those specs are from a Toyota publication. Whether they both use the same EPS unit is an unknown, but my guess would be that they do not.

Since we are looking for best match in Limp mode, the Corolla looks like a good bet for most MGBs, and the 16" Prius for most more extreme MGBs. The 15" Prius would likely give very light steering, but might be good for a car of about 2700 lbs with unusually wide tires.

Jim



Edited 1 time(s). Last edit at 12/02/2016 01:14PM by BlownMGB-V8.


MGBV8
Carl Floyd
Kingsport, TN
(3106 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Electric power rack steering
Posted by: MGBV8
Date: March 21, 2017 11:16AM

From Tony Gentile's thread: List of EPS Units

Quote:
Below is the list of cars that have Fail-Safe Electric Power Steering columns, this means that Only 3 wire connection. Ignition On, Power and Ground to the Steering ECU. That's it ! These units will run in limp mode, which is a power assist that is more than enough to supply power steering to the light weight of our little hot rods, and if there is a full failure revert back to your original manual steering

2004-2009 Toyota Prius
2009-2013 Toyota Corolla
2006-2011 Toyota Yaris - (With ABS)
2007-2009 Nissan Versa
2009-2012 Nissan Cube
2012-2014 Kia Soul

ECU Part Numbers:

2004-2009 Toyota Prius 89650-47102
2009-2013 Toyota Corolla 89650-02300
2006-2011 Toyota Yaris - (With ABS) 89650-52120 / 52050
2007-2009 Nissan Versa 28500-EM30A / 991-30303
2009-2012 Nissan Cube 28500-1FC0B / JL501-000932
2012-2014 Kia Soul B2563-99500 / 4PSG1312 / FPSG1312

I pulled this list off of the forum "For A Bodies Only" and a post by waid302, Below is a direct link to this post

[www.forabodiesonly.com]



Bv8nc
Mike Peacock
Wilmington, NC
(10 posts)

Registered:
02/23/2015 04:48PM

Main British Car:
1977 MGB Roadster Rover 3.9

Re: Electric power rack steering
Posted by: Bv8nc
Date: March 23, 2017 11:04PM

Hi everyone. Very interesting information.

Has anyone compared the Nissan Versa EPS physically to the Saturn Vue EPS ?
It looks like it uses a similar three bolt flange to mount the upper column to the motor.
That might make it an easy swap for any of us who have modified the MGB mount to bolt to the Vue EPS motor.

Mike


tdecell
Trey Decell
MS
(31 posts)

Registered:
04/10/2010 12:13AM

Main British Car:
1974.5 MGB GT 3.9L Rover

authors avatar
Re: Electric power rack steering
Posted by: tdecell
Date: May 14, 2017 10:24PM

I just picked up a unit today from an 08 Nissan Versa. Laying it next to my 74.5 BGT column looks like it won't be too difficult to make work. I did power it up using the red and black wires with it mounted in a vise, it would turn easily to the right but didn't seem to work turning left. There is a small electrical box integral to it with 4 small wires coming from it, any of those needed?

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