Torque Cars

electric power steering /steering feel effort make it adjustable !

Discussion in 'Engine questions' started by viggen, 1 January 2018.

  1. viggen

    viggen Full member

    Messages:
    12
    From:
    kalamazoo michigan
    Car:
    saab 02' viggen CV
    I read this in a Saab forum and decided to post it to elicit comments I suppose he is speaking of the high power assist of the stock, OEM PS system and wanted a solution to improve steering feel/feedback! less filtering? I wonder if this is / would be safe so i do not sanction it so beware ! would like a qualified engineer to comment and give their opinion? thx Subject:" In an effort to improve steering feel because I never liked the high-level power assist on my cars, I figured that had few options:SO"

    4)" I did this: I was replacing the power steering pump anyway, and I realized that it has an internal pressure relief valve just like the engine oil pump. In both cases the fluid pressure can build until a certain level, at which point a spring is overcome, a ball or piston moves which exposes a passageway, and the excess pressure escapes. The output pressure is determined by the strength of the spring. So I totally guessed and clipped off 2 coils from this spring, ground the end flat, and reassembled. "

    "So far it drives like I had hoped - which is like 20% of the power assist is gone, and the steering wheel has a new weight to it. Parallel parking is still no problem. I don't see any downsides to this, only upsides...like less wear and tear on the PS pump, belt, pressure hoses, and steering rack because of lower system pressure. A little less power robbed from the crankshaft too. Anyone else try this? " PS
    PS now how about if we could adjust it at will? a small electric servo motor or a stepper motor turning a bolt, shaft, changing the pre-load on the /a spring (like in the example above ) like motorcycle fork springs adjust preload? bring our old steeds into the 21 st century? who wants to suss this out and make it happen ? WE are a nation of clever engineers and auto part producers ! thx I'm interested in is adapting a TRW EHPS pump (eg, Volvo S40/V50) and building some sort of gateway that can convert the 4000ppm speed signal into a CAN message to control the pump. That is useful across 99/900/NG900/OG9-3 and probably dozens of other cars as well. Now who is an electronic boffin and can pull this little job off ? THX
     
  2. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,202
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    I wouldn't risk a steering mod like this. I suppose worst case is that you lose all power assist if it fails.

    Wouldn't it be easier and safer to swap in the power steering from another brand which does have a better feel. Many now only power assist slightly at road speeds or minor turns of the wheel and then at parking speeds or larger turns of the wheel give much more power assistance.
     
  3. viggen

    viggen Full member

    Messages:
    12
    From:
    kalamazoo michigan
    Car:
    saab 02' viggen CV
    UH, well that is the point, all modern cars do use an adjustable system! so we want to too! IF it failed we'd still have Manual steering remember that? I'm interested in is adapting a TRW EHPS pump (eg, Volvo S40/V50) and building some sort of gateway that can convert the 4000ppm speed signal into a CAN message to control the pump. That is useful across 99/900/NG900/OG9-3 and probably dozens of other cars as well. Now, who is an electronic boffin and can pull this little job off? THX PS For a better mod ?, there was a guy on another forum who installed a Chevy Corsica rack a couple years ago. Reduced lock to lock turns quite a lot as I recall. You'll have to Google for it. (anybody know where this post is) ? thx !
     
  4. viggen

    viggen Full member

    Messages:
    12
    From:
    kalamazoo michigan
    Car:
    saab 02' viggen CV
    For a better mod ?, there was a guy on another forum who installed a Chevy Corsica rack a couple years ago. Reduced lock to lock turns quite a lot as I recall. You'll have to Google for it. (anybody know where this post is) ? thx ! PS recall that the saab rack is mounted on the firewall ! (saab are quirky !)
     
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