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Old 04-12-2018, 12:42 PM   #1
745T+
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Default Electric Power Assist Steering (EPAS) in P1800

One of our members, Volvero, made this power steering conversion in a 1970 1800E. I shipped the Electric Power Assist Steering parts to him in Santiago, Chile. The EPAS parts are hidden under the dash.







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Old 04-12-2018, 12:56 PM   #2
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Wow! Is the EPAS from an existing vehicle or is this more like an aftermarket "universal" part?
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Old 04-12-2018, 01:10 PM   #3
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Originally Posted by CAPT_BLOTTO View Post
Wow! Is the EPAS from an existing vehicle or is this more like an aftermarket "universal" part?
I deal in used EPAS units from Saturn Vues. Chevrolet Equinox, and Pontiac Torrent. They require an electronic adapter to send a simulated electronic speedometer signal to the EPAS unit. The level of assist is adjustable. The used units require adaption into the existing steering column. I sell cores to http://www.epowersteering.com/index.html. Ken makes really nice kits from the same basic EPAS units, but the cost is higher.

Last edited by 745T+; 04-12-2018 at 02:01 PM.. Reason: spelling
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Old 04-12-2018, 01:15 PM   #4
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745T+ is the man, he sent everything I needed, the electric motor, column couplings, control unit, potentiometer, etc. The installation requires welding and creativity but the effort is really worth it.
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Old 04-12-2018, 01:46 PM   #5
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That's pretty crafty boys, nice stuff.
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Old 04-12-2018, 01:56 PM   #6
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EPAS is becoming a really popular swap in rally cars. Quick manual rack and EPAS is reasonable inexpensive for most cars.
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Old 04-13-2018, 11:36 AM   #7
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Yeah you can get 2.5 turbo guts for the ZF manual rack (a little difficult to find) easy enough and EPAS reliable koyo Japan column. What’s not to like? No more fluid/seals, doesn’t matter what engine you install if you want to install a giant V8 or something.
Pretty crowded under the 240 dash already though and 2.5 turn guts for the ZF power rack also exist...

Install an electric hydraulic pump and hydroboost off an Astro or something for even more engine bay space?

Thinking vanagon with 2.5 turn ZF manual rack and Subaru SVX motor might be a good application.
No A/C because if I need that it’s not a “vacation.” Should make shoe-horning the non-interference DOHC EJ22+2 holes in there a little easier without a bunch of hooptie hydraulic lines to run 16’ or whatever trying to make it all work with the inevitable motor adaptation in a tight engine bay.

The hydroboost from Astros and Gm trucks seems to be fuse free.

Manual steering in the vintage cars is the devil and should be exorcised.
Though a 2.5 turn narrow tie rod attachment point rack would be nice to get rid of the dreaded box...but the box is only 3turns in 1800/122 and power steering 140 (has a much more robust box).
Ideally with rear mount rack and better geometry but that means all new spindles and front/dry sump usually...
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Old 04-13-2018, 03:50 PM   #8
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That's really tidy. I agree with Kjets; the manual steering on my 140 is by far its worse feature. I thought I counted almost 4 turns last time I had the front in the air.
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Old 04-13-2018, 04:07 PM   #9
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4.15 for 140's actually. 1800's and 122's are 3¼.
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Old 04-13-2018, 04:59 PM   #10
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4.15 for 140's actually. 1800's and 122's are 3¼.
That makes sense. I'd love to address that at some point. This looks like a possible option.

Any idea what the current draw is on one of these?
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Old 04-13-2018, 07:40 PM   #11
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That makes sense. I'd love to address that at some point. This looks like a possible option.

Any idea what the current draw is on one of these?
With the key on, and no steering effort, the electronics require fractions of an amp. This unit is usually fused at 50-60 amps, and the fuse never blows from steering use. The amps required will be dependent on load. The power to the motor needs to be connected directly to the battery. Under heavy load the battery supplies current if the alternator can't keep up. The motor draws current only under steering load. Under steering load, the motor is silent.
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Old 04-24-2018, 07:14 PM   #12
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Definitely interested in something like this on my 142e as I will be running 235's. Did you install a dial or switch to adjust sensitivity? Would be nice to see pics of where the welding and required modifications are.
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Old 04-25-2018, 04:08 AM   #13
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Quote:
Originally Posted by culberro View Post
EPAS is becoming a really popular swap in rally cars. Quick manual rack and EPAS is reasonable inexpensive for most cars.
understandable.
a hydraulic setup robs power from the crank even when the car drives straight.
Also, stock hydraulic powersteering setups do not like sustained high revs, the hot oil tends to trap airbubbles. i have seen this happen on a 740 rally car. Hydraulic assisted racks also seem to resist really fast steering inputs.
yeah, you could instal an underdrive pulley and an oil cooler but having an EPAS seems to be the better solution.
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Old 04-25-2018, 04:51 PM   #14
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I'm not ready yet but I definitely want to do this in my 122.
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Old 04-25-2018, 05:08 PM   #15
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Quote:
Originally Posted by Brandonium View Post
Definitely interested in something like this on my 142e as I will be running 235's. Did you install a dial or switch to adjust sensitivity? Would be nice to see pics of where the welding and required modifications are.
A potentiometer is used to adjust the amount of assist. Most people set it and forget it, but you can adjust from full assist for parking, no zero assist at highway speeds.
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