power steering ?

Rick Merz

Lifetime Supporter
Mick, Is this steering unit installed in a RCR40? Pic 61 looks like a RCR pedal box. If so it looks like it solves the height issue with the steering shaft being too low for BIG feet (shaft looks higher).

Rick
 
Hi Rod,

They where the smallest units i could find back when I installed mine also seemed to be the most popular option for all the rally drivers. It went into my Roaring Forty perfectly and into the DRB just as well. I can send you one not sure how readily available they are.
I will pay you just let me know.
 
Hi Rod,

They where the smallest units i could find back when I installed mine also seemed to be the most popular option for all the rally drivers. It went into my Roaring Forty perfectly and into the DRB just as well. I can send you one not sure how readily available they are.
If you could get me one I would greatly appreciate it and will pay you to ship it to me Rod.
 
hi guys I always thought I needed to look for a Corsa B but you seem to be using a Corsa D so that fits too? Can anyone tell me how long that column is please?
 
Way back when in 2012 I posted info on a unit that Kieth Stafford and I collaborated on that went into my 40. If I remember correctly Kieth ran an electronics outfit in Ireland, and we came up with a unit that would work nicely. Look up DRB#5 and go to page 9. I believe and it makes mention of it. We wired it so that at the push of a button the Power unit would activate and would stay on for only 60 seconds(I believe that is correct), which was sufficient to get into or out of a parking space. Then it would convert back to regular steering. A second punch of the button would turn the unit off. I wanted the unit because I had some trouble with my shoulder(which hasn't acted up since). I also have to make a 360 degree turn to make it into my basement garage from the front drive way. This could be done with one hand. I believe it came from the Corsa B. This works like a dream as I feel the unit is not needed with regular driving. Foot pedal height is fine and I don't have much trouble with touching the shaft with tennis shoes on. Don't know if Kieth is still active on the Forum, but this seems to be the best setup.

Bill
 

Terry Oxandale

Skinny Man
I just finished installing the Prius EPAS on my car. In default (or "Fail Safe") mode, it's a single-finger effort to turn the wheels while the car is at rest in the garage. I shortened the OEM Prius EPAS from 17" to 9" in order to get it to fit due to the center-pinion steering rack I have (to match the 911 column that was in place since the original build). It's a 3-wire set-up with no VS sensing, so very simple to wire up. The Porsche rack is a 1.5 turns L-to-L, which is very hard on my old shoulders without some assist...so now I can focus on the driving line instead of the driver's pain.
 

Jim Dewar

Supporter
Inspired by this thread, I installed Prius EPAS in my RF GT40 and have a problem someone may have experienced and resolved in their car. I have almost no Return-To-Center even with caster settings of 5.2*, this makes this mod almost unusable to me. The alignment is correct and no binding in steering rack or column, including joints. I have found this complaint on other sites related to Toyota EPAS installation on project cars without a resolution. I own a Prius (daily driver) and the Return-To-Center is excellent. All thoughts are appreciated.
 
like torque,reverse torque inputs from steering rack and effort on return from thé wheels against the rack effort which brings you automatic to return zéro point. while you dont hâve thèse inputs....... your powersteering is in limp home mode and you havé limited assistance only
 

Terry Oxandale

Skinny Man
Jim,

My suspension settings are probably pretty close to yours. My rack does center back about 50% of what it did prior to the EPAS install, but I think the main difference is my 911 rack's very low ratio (1.5 turns L-to-L). This low ratio puts more input into the steering wheel, which 1) makes the wheel harder to turn, and 2) provides more centering torque when the wheel is released. That high torque is why I needed some assist in the first place, and is probably the reason I've not perceived this to be a problem (and that I never need to hand-over-hand steer the car). I'm assuming your rack has a higher ratio typical of most racks?
 

Jim Dewar

Supporter
Terry,

The key may be to reset the ecu (zero the torque sensor, etc.) but I can’t sort how to accomplish this since the ecu has been removed from the can-bus system and can’t be connected to the Toyota diagnostic tool. The guys using the Corsa B and C don’t seem to have this complaint.
 

Terry Oxandale

Skinny Man
Check my logic here, considering the design of the EPAS system, and how it uses a torsion device separating the input shaft from the output shaft, in practice the centering characteristics with the system completely disabled should be identical to the pre-EPAS column. Thus for any difference to be seen between the two on wheel centering, I would think some amount of friction or drag on the input side of the column, which would be identified as some amount of torque on the torsion piece (the output shaft is trying to rotate the input shaft), would inhibit the ability for the input shaft to center or overcome the resistance from the input shaft. I'm just trying to understand how an EPAS system would dampen, reduce, or eliminate centering of the wheel unless some torque difference between the two exists. Now, with that said, if the driver resisted in any way the centering of the wheel (inadvertently or not), then obviously this resistance at the input shaft would be seen in the torsion component, and thus keep the wheel from centering.
 

Jim Dewar

Supporter
Interesting statement from developers.


Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems
Pan-Pan Du, Hao Su, and Gong-You Tang

Additional article information

Abstract
This paper presents a complete control strategy of the active return-to-center (RTC) control for electric power steering (EPS) systems. We first establish the mathematical model of the EPS system and analyze the source and influence of the self-aligning torque (SAT). Second, based on the feedback signals of steering column torque and steering wheel angle, we give the trigger conditions of a state switch between the steering assist state and the RTC state. In order to avoid the sudden change of the output torque for the driving motor when the state switches frequently between the steering assist state and the RTC state, we design an undisturbed state switching logic algorithm. This state switching logic algorithm ensures that the output value of the RTC controller is set to an initial value and increases in given steps up to a maximum value after entering the RTC state, and the output value of the RTC controller will reduce in given steps down to zero when exiting the RTC state. This therefore ensures smooth switch control between the two states and improves the driver’s steering feeling. Third, we design the RTC controller, which depends upon the feedback signals of the steering wheel angle and the angular velocity. In addition, the controller increases the auxiliary control function of the RTC torque based on vehicle speed. The experimental results show that the active RTC control method does not affect the basic assist characteristics, which effectively reduces the residual angle of the steering wheel at low vehicle speed and improves the RTC performance of the vehicle.
Keywords: electric power steering systems, torque sensor, angle sensor, state switch, active return-to-center control
 
I was originally going to go with a Corsa B but then changed to an Agila A / Wagon R.

There were a number of reasons behind this but the main ones were.

1) The Agila A column is lighter
2) The Aglia A column is smaller (and the motor angles up not down).
3) The Agila A column has a magnetic clutch, so without any power there is only a tiny bit of drag in comparison to the Corsa B.
4) It is fully collapsible.

As a bonus the steering lock is functional (unlike with the Corsa B).

BCtz8eQw7pSwqt8jGVvslbOYZJrdMQ2oBpM1w3dS5hhM_70zF3n4OZYWKNFbp4w5wS2s1ZhtL2r5muP7HtcF2PM6fWa0vvsU0y1mHWVuAcUh4uLV7eXTQKJbZ4X1owEJTqUX_apJAJNQzcyOGqPz-F2G8m4FVGKw1SV3Z26yH9RVvP1K7HbSmdPxzDjzp9wDhdEFiPHpYjJkGlcgNIX3Sgu0xt6Va6vCG7OmjSTy1lAKJhAecCHH10mmtQwyvTzdIje8znxdF94tD93Jr0jAORqAbK9R8hw7DxmnG0JHGcGLv5eEugJvfm0x2HB8mHBLGsBXcyBLtgUQB1SVnLBUoObVgfXFY57do9PTuZwSqxRsLMvbEntSP_iyo4A3_3ukDaWxQ0G7L1f3b9vqEMFrP7HvLsnBBwmQgaOCngHcrT1MAiAbBoACggtvFO5BIJpW6iqUuzV5fkAAKk46agwxP2WD2nXkIm4fbNUzuNAlSEZeH31Fu_vIJOtX5EzzWMzm3Uc0hoK4nGobHL2Mbnb2lFhAwX3stZjtsk-KMS6a_qSQY9KeUpGxUOjJizOGYMnZZXoUVJvD9Wgqt5AY-vtolkV0ADSdTTun1nPRPENusSZV70tEvCSIK9T4AQSzjgmXFNqyE7RjNDJ5snc9SwSLxSLklIhk12LbFRuEVw5enXIpQ8p-rPUHiflRv1PnWyovJZnlBPnPzSXzjxW_GofAchIxtg=w1250-h937-no


A comparison of the two (Agila on the bottom).

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e01ygB99pwjlN95OYm3Lfkk9Dz5PTjb5B43cGFNz-fMgp5uNvmvEE8a7fNNGypEtnqArx8l-p9otvdb89G3DXi0mdejRUDv8-dgIVKjLjobWJpUkBzF7tJeF4t7bgfalaBAmHJXnw4zb7LBfn9vrqg_twmpY2EPGLeXa_nZ2gkkdzxeaAwAYvj4pdly0DTBgXwtClslo93X7sqL9Kp5XMa9MRuUteZKmX0NF1VJOh4LE__umEdLuHQ4Qw4yU3HChvM77JlR5vNtcTxINpVJ8GpUrWt93S9fVKwX_zVC3wyQRpoPDWQjbhxaZnTQv7yEFOQ0IzH1gzXsHHOECbWuRWjYymK7TFr1_AUXolyfZB_SlBrafoHt0qUdfEHqC0GZHth-KyCgstD0hA9tspPuTrlQwNiYXxo47XTwN6s_tg0kVyc2_oZxyiOuTxd7t0b-QjUigpER0Z38rUKvloq3X18DwPRlDQpePVOIPMJXWPr-LCly0PZhdeWyEOeYF6fQvqcL48T1QQUOJfApkoouQ_olvE82SorfWODY3FsNnZ1ysBSL4QWigVtVwJ81ZTzZTND-dmwEkhxmUsKOhvxR_oHaAFV-c6qgBi1AcNPUxKGDMYVMEexPCGcBPDI1juInr5CJOQZfTWABIbx-xYODPsXKwtYkc_UFkMIke9azlMyzlN3qIWvIRNltuXSG78HfA9wihqqtbRyMGlREGNQ1e_4SD8w=w1250-h937-no


I did put in a fairly hefty assembly to take the torque reaction from the column however.

hvNFcFtj6m7zCwu9j7vUzpoV8VH2XgV5PjniZiPsFMj_0Ldn94E07O2Ln6p6FNZ0t2cF8IgMTRU_R-32whxOYjkbcrkfWyOYvb-_zo8T1bqE97b3mYdIfm8CPf5KqJq4NH5e3bpjaMiZR11KCIOaC7LVYpdCVBAz91oKdvBs0wMfS4RBSZKdIZtUq6oDv7bc7Ne_RdvX87ZbHz-EgMckUQcpRnlp4b4paK-m_QEwLsGJGOMmvN3aFgI9df6HT3HznTIIdVHftev_tB8O5WwBUoUTg4uVlp-VKVAmiQFJDxlOfZF9b-ZEtMkSWkXOk5MNSEyZ8l7RD4zYPI91WiU-73IcDGDTW_kobO9hceD6rQ-4pqh51Xk7C-E_sow4-Gl81H0dhEZNBmQOnodehCCv2cjG5CrLATatumZPpKKrRK4iUyl3A9NWfCCpzKzX7CoO7KTnAYHVm7zzS5uULCFmI5EJw0mRja0ZHfnehmC-FNxF4zBQCYrzjfOjc5nfT5lU3TL85EwO0QcZl82JfSv42IR8Ms6-cNVI14OPbKZK4U1vnHcbzioD25AR2zpyoFZavBo2L4CNKofl3qlfflr1OTJCCRWWIYbposqBeVAEc4og4Gd46okAbCRd2579Pcmi4C0AiJoHeoqMLVEqgXznkLmWTpvwM-c-Rf8N9PfemzcmaQZNceyYZJf-8ujdy4_0iL-brnh6NM30lFCGF0uewGaIhA=w1250-h937-no


Downside is that while the spine is the same as the BMW E46 the adaptor doesn't really work and I'll need to get one made up. For IVA however I'll be using the original wheel.
 
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