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S54 Custom Oil Pan BMP Conversions

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    #16
    Looks like they moved the tie rod mounting points forwards on the knuckles too
    Byron
    Leichtbau

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      #17
      Y'know, with a little Paint geometry, ASSuming the pic is at 90 to the plane of the steering,
      that would work. It WOULD have very little Ackerman angle, as the near-
      parallelograms formed by the rack, arm, hub and body are pretty much parallelograms,
      but, barring the tie rod ends being other than where they SEEM to be, it'll be OK.

      A bitch to park, tho, I'd expect! Lighten up nicely at speed? Prolly.

      I dunno. I'd drive it before I bought it, certainly!

      t
      thinking it'll be easier to wet- sump it... but certainly not cheaper!
      Armstrong Race Engineering (ARE) Dry Sump Systems - products engineered with a passion
      now, sometimes I just mess with people. It's more entertaining that way. george graves

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        #18
        So Arc Asylum isn't making sub-frames any more?



        Originally posted by R3Z3N View Post
        So it seems Tyler @ ArcAsylum disappeared.

        And BMP Conversions just may have your answer. I saw this on their Facebook page, and it looks like they have made a few versions. Not sure which is current, or how the pan is modified, or how the ackerman is affected due to placement of the rack, not sure how far forward it is of the knuckle point.

        Here's their Facebook

        And Website

        No affiliation. Best of luck with your builds. BTW if you need DME coding, check my sig. No one should pay for swap coding anymore. I'll also offer to walk you through via a remote session.
        91' 318is 90' 325is

        Originally posted by Sonny
        Buy the E30s, they ain't gonna last long
        E30 can make you, E30 can break you
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          #19
          He took several cores and payments and disappeared. A few got their product. Not all.

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            #20
            Ackerman is NOT effort.

            Ackerman geometry turns the outside tire further than the inside tire so that they're both turning around a common center point and aren't fighting each other.

            A car with bad Ackerman will shudder as the tires chatter when turning at full lock, but that doesn't equate to particularly high wheel effort.

            It really comes down to this: Will you accept the parking lot behavior in order to have an S54?

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              #21


              This is a RHD car.



              This is a LHD car. Packaging the spool valve on the rack appears to be what requires cutting the oil pan.

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                #22
                Originally posted by The Dark Side of Will View Post

                It really comes down to this: Will you accept the parking lot behavior in order to have an S54?
                I am not sure why everyone is trying to reinvent the wheel with this and moving around the rack. Tyler had a good design despite disappearing, someone just copy that.
                e30sport.net
                '15 Porsche GT3 - 7-speed PDK - Daily Driver
                '86 325es - s54b32tu - 6-speed - Mtech 1
                '89 325is - m20b25 - 5-speed - Individual

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                  #23
                  The geometry of the steering rack is copied from an e36 as he states in this video...

                  This is just an update video of the progress of the build showing all the new parts being fitted. I'm loving building this car


                  He talks about how he recreated all the e36 geometry, not just slap 5 lug struts on an e30 "and hope for the best".
                  john@m20guru.com
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                    #24
                    Ackerman is NOT effort.
                    Nope. But a car without enough Ackerman angle will, as you note, not want to turn
                    at low speed, as the front wheel(s) scrub.
                    I made the ASSumption it was unboosted, and having removed the geometry that creates Ackerman
                    from a race car with a rack conversion, it WAS hard to steer at low speed. But that
                    car had tires like our victim. And was unboosted. Went great at speed, tho.

                    Ackerman geometry turns the inside tire further than the outside tire
                    Fixed that for ya. The inner radius is smaller, so the inner tire needs to be steered
                    into the corner more.

                    t
                    now, sometimes I just mess with people. It's more entertaining that way. george graves

                    Comment


                      #25
                      Originally posted by ForcedFirebird View Post
                      The geometry of the steering rack is copied from an e36 as he states in this video...

                      This is just an update video of the progress of the build showing all the new parts being fitted. I'm loving building this car


                      He talks about how he recreated all the e36 geometry, not just slap 5 lug struts on an e30 "and hope for the best".
                      What an amazing piece of work.
                      1989 332IS -S-Fiddy Four-Some weight removed.
                      5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

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                        #26
                        Originally posted by The Dark Side of Will View Post


                        This is a RHD car.



                        This is a LHD car. Packaging the spool valve on the rack appears to be what requires cutting the oil pan.
                        Look closer. They are completely different designs. One kept the original tie rod location, the other moved it to the other side of the struts.
                        Build thread

                        Bimmerlabs

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                          #27
                          I just posted stuff from their facebook, as I too am looking for an alternative. I have Tyler's setup, but want a spare should I crack the pan.

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                            #28
                            Originally posted by ForcedFirebird View Post
                            The geometry of the steering rack is copied from an e36 as he states in this video...

                            This is just an update video of the progress of the build showing all the new parts being fitted. I'm loving building this car


                            He talks about how he recreated all the e36 geometry, not just slap 5 lug struts on an e30 "and hope for the best".
                            Its hard to see but copying the E36 geometry for rack placement only works if the upper strut mount is in the same location. The E36 damper tube is obviously much more vertical than the E30 which “reclines.” This impacts the caster/mechanical trail of the suspension and has a big impact on steering feel & wheel centering.

                            Maybe all this was taken into account, but if someone wants to replicate the setup its something to be aware of.

                            For all these reasons I still feel that keeping with the factory E30 suspension geometry and parts is the best path. The OE geometry is not perfect, but the negatives are well known and the solutions are known as well. Once you start mixing and matching you open pandoras box, especially if you don’t understand the implications of the changes. Getting things to bolt in and having the wheel centered is the bare minimum to consider 😃
                            -Nick

                            M42 on VEMS

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                              #29
                              Originally posted by wazzu70 View Post
                              Its hard to see but copying the E36 geometry for rack placement only works if the upper strut mount is in the same location. The E36 damper tube is obviously much more vertical than the E30 which “reclines.” This impacts the caster/mechanical trail of the suspension and has a big impact on steering feel & wheel centering.
                              I don't know exactly what the parts are, BUT if he took struts with steering arms designed for a specific caster and used them in a body with way more caster, he's going to end up with bump steer unless he changes the steering arms or otherwise fixes it.

                              Originally posted by TobyB View Post

                              Fixed that for ya. The inner radius is smaller, so the inner tire needs to be steered
                              into the corner more.

                              t
                              Yep, my bad.

                              Originally posted by nando View Post
                              Look closer. They are completely different designs. One kept the original tie rod location, the other moved it to the other side of the struts.
                              I get that they're completely different designs and one obviously moves the rack forward compared to the other, but LHD/RHD packaging can play into those decisions in a big way.

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