Electric power steering conversion... this will be fun :)

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Re: Electric power steering conversion... this will be fun :

Postby MWP » Thu Nov 13, 2014 3:29 am

I haven't made a controller for it yet, so it feels pretty terrible so far.
Ill whip one up in the next few weeks.
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Re: Electric power steering conversion... this will be fun :

Postby bajallama » Thu Nov 13, 2014 1:53 pm

MWP wrote:Nice :)
So is your blog up to date? Its still running in limp-home mode so far?
Megasquirt can't output CAN bus packets suitable to run the EPS without specific support being added to the MS firmware.


Darn. After you told me this I found your post on the MS forums! Sadly no one has responded. That sucks though, I guess I'll just have to output from the MS to a CAN sim then to the EPS ECU.

Ya my blog was updated yesterday. It works fine in limp mode but there is like zero response at speed so I'm not feeling the road like I want.

Few questions:

What did you do about your ignition switch to get it to work with the newer one? Did you re-pin the connector?

For the firewall boot that goes around the shaft, how did you seal that off? I have a small exhaust leak and now its in my car, haha.

For the wiper switch, did you just wire it up and it started working? Mine is acting kinda wacky and I think I will have to adapt the Scion relay somehow.
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Re: Electric power steering conversion... this will be fun :

Postby MWP » Thu Nov 13, 2014 3:01 pm

Im using the RAV4 barrel & key.
Its all rewired.

I dont remember what i did with the boot... i think i just cut it short.

Front wipers just work. Switch/wiring setup is the same as the original.
Not sure about the rear wiper though, i dont have one.
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Re: Electric power steering conversion... this will be fun :

Postby bajallama » Thu Nov 13, 2014 3:41 pm

MWP wrote:Im using the RAV4 barrel & key.
Its all rewired.

I dont remember what i did with the boot... i think i just cut it short.

Front wipers just work. Switch/wiring setup is the same as the original.
Not sure about the rear wiper though, i dont have one.


Okay, thanks. The 165 must have different wiring and wipers. The wires going to the ignition switch are are about 3 times larger than the ones for the Scion.
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Re: Electric power steering conversion... this will be fun :

Postby MWP » Sun Nov 16, 2014 12:22 am

Yeah, thats no surprise.
As copper is expensive now and efficiency/weight is a big concern, they have done a lot to reduce power use and shrink the size of cables.
Ive used relays for everything, so the barrel never sees any big current in my car.
... but my wiring is very far from typical.
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Re: Electric power steering conversion... this will be fun :

Postby CSAlltrac » Sun Nov 16, 2014 1:15 am

I really don't see the benefit. I could possibly see it if the gear from a sport oriented factory car was utilized but a Corolla has some pretty numb feedback. Electronic steering is pretty numb over all, even in the sport mindset. What's wrong with the hydraulic setup? Seams like a ton of work for not a huge gain.
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Re: Electric power steering conversion... this will be fun :

Postby MWP » Sun Nov 16, 2014 2:22 am

No maintenance required... ever.
No stuffing around with hydraulic lines in the engine bay, saves a good 30mins when dropping an engine for example.
Power steering assistance & feedback levels can be tuned.

Yes, a Corolla, RAV4, etc may not be the best choice for a donor vehicle.
But they feel ordinary because they have been tuned that way... not because EPS is 'bad'.

If i could find a reasonably price '86/BRZ EPS unit i would have used that.
Reviews have said it has one of the best steering response/feel of any recent sports car.
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Re: Electric power steering conversion... this will be fun :

Postby bajallama » Mon Nov 17, 2014 1:57 pm

Ya, I am really happy with the conversion so far and will do it on anything I own in the future. Not only do you get the added benefits of no maintenance but I'm not surprised if you save at least 20+ lbs in weight. My 4th gen column weighed about the same if not more than the EPS column with the motor plus you get rid of all of those 20 year old leaky hydraulic lines.
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Re: Electric power steering conversion... this will be fun :

Postby bajallama » Tue Dec 02, 2014 12:01 am

Finally got around to putting the Scion plastics and ignition switch in:

Image

Image
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Re: Electric power steering conversion... this will be fun :

Postby 88gt4DE » Sun Dec 28, 2014 4:40 pm

Wow ... very interesting ... hows it been working for ya ?
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Re: Electric power steering conversion... this will be fun :

Postby UtahSleeper » Sun Dec 28, 2014 6:13 pm

I love the concepts here. Just need to get more comfortable with welding/fabricating then I may have to dive into this.
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Re: Electric power steering conversion... this will be fun :

Postby MWP » Mon Dec 29, 2014 12:45 am

bajallama wrote:Finally got around to putting the Scion plastics and ignition switch in


Nice work, looks like it fits quite well.

Did you have to cut any of the factory plastic panel (bit that goes between the column and gauges) away?
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
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Re: Electric power steering conversion... this will be fun :

Postby 88gt4DE » Sun Jan 04, 2015 11:00 pm

If you need a EPS ECU ... I have one for an 08 Highlander brand new in box :smokes:
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Re: Electric power steering conversion... this will be fun :

Postby bajallama » Mon Jan 05, 2015 4:10 pm

MWP wrote:
bajallama wrote:Finally got around to putting the Scion plastics and ignition switch in


Nice work, looks like it fits quite well.

Did you have to cut any of the factory plastic panel (bit that goes between the column and gauges) away?


Nah, I just trimmed the scion column plastics to clear the factory panel. The column does sit a little lower than factory. I shoved it up as much as I could but it's fine. Once I run an steering wheel extension and a lower seat, the wheel should sit perfectly in front of me.

Almost 3k miles on the steering setup and still love it! It's still a little too light at speed and I tend to get a little too confident in the canyons because it's kinda hard to tell when I'm understeering due to the low feedback :P
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Re: Electric power steering conversion... this will be fun :

Postby MWP » Mon Jan 05, 2015 4:53 pm

Nice :)

A few days ago i realised i wasnt multiplying the speed value to the EPS by 100 like i should have been :P
Fixed, and now it feels much better.
Still a more tweaking to do though.
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
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