Announcement

Collapse
No announcement yet.

The comprehensive DOHC engine swap thread.

Collapse
This is a sticky topic.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Those with AKG poly motor mounts, anyone ever wrap with a heat shield on the exhaust side? If so, what did you use?

    Comment


      I have a m52b28 from a 1998 328i car in my 1990 325iS. The PO did the swap and ever since I've had it, it has had some running issues and the o2 sensor(Lambda Control 1 code 1222).

      I have just one o2 sensor in the exhaust as the PO said there is only need for one. Is that true or should I have two o2 sensors?

      I'm running the red label 413 dme, obd1 swap
      1990 325is
      m52b28
      3.73lsd
      g260 (1987 325is 5spd tranny)

      Comment


        Originally posted by TeXJ View Post
        I have a m52b28 from a 1998 328i car in my 1990 325iS. The PO did the swap and ever since I've had it, it has had some running issues and the o2 sensor(Lambda Control 1 code 1222).

        I have just one o2 sensor in the exhaust as the PO said there is only need for one. Is that true or should I have two o2 sensors?

        I'm running the red label 413 dme, obd1 swap
        Where is the o2 sensor at? 413 only uses 1 mounted at the y pipe so it reads both banks. The m52 exhaust uses 4 o2 sensors, 2 at the headers and 2 behind the cat, if it is only using 1 o2 in the header you are missing reading half the engine. Code 1222 looks like it is a lean mixture fault, have you smoke tested the intake & checked for exhaust leaks? My 95 m3 used to set a lean code on long highway trips, it was fixed with a fuel filter & new o2 sensor.

        Comment


          Thanks for the reply.

          Where is the o2 sensor at?
          It was originally just reading one of the banks from the stock exhaust. So I got some long tube headers and straight piped the car. The exhaust shop put the o2 sensor after the collectors.


          have you smoke tested the intake & checked for exhaust leaks?
          Yes, I've checked it and then had another mechanic check for leaks. I have also replaced the o2 sensor that is there.



          Right now the car is at the shop and the guy said it needs both O2 sensors to read correctly. From my research on this swap, I wasn't really able to get the answers about how many o2 sensors are needed.
          1990 325is
          m52b28
          3.73lsd
          g260 (1987 325is 5spd tranny)

          Comment


            I have a question about wire harness and ecu flash.

            I have an e30 with a frankenstein s52 swap = m50 head and m50 block bored to 3.2, s52 pistons, s52 crank, s52 headers, s50 cams. Obviously OBD1. This setup had a flashed ecu by TRM.

            My piston rings are fried (tired engine) and I am putting another s52 in.

            The S52 comes with harness, ZF tranny, and all accessories.
            I am going to:
            M50 manifold swap, but I am wondering if I can use my old engine's m50 wiring harness on the S52? I want to avoid paying again for another e36 to e30 wiring harness adapter and the very expensive TRM flash again for this new harness.

            I think I can use the old harness and ecu, but I might have to change all the engine sensors (crank position, cam position, etc) which connect to the m50 harness to the m50 type. Is this correct?

            I would rather avoid the $600 TRM ECU cost and the $200 wiring harness adapter cost again.

            Comment


              Originally posted by cocofunk View Post
              I have a question about wire harness and ecu flash.

              I have an e30 with a frankenstein s52 swap = m50 head and m50 block bored to 3.2, s52 pistons, s52 crank, s52 headers, s50 cams. Obviously OBD1. This setup had a flashed ecu by TRM.

              My piston rings are fried (tired engine) and I am putting another s52 in.

              The S52 comes with harness, ZF tranny, and all accessories.
              I am going to:
              M50 manifold swap, but I am wondering if I can use my old engine's m50 wiring harness on the S52? I want to avoid paying again for another e36 to e30 wiring harness adapter and the very expensive TRM flash again for this new harness.

              I think I can use the old harness and ecu, but I might have to change all the engine sensors (crank position, cam position, etc) which connect to the m50 harness to the m50 type. Is this correct?

              I would rather avoid the $600 TRM ECU cost and the $200 wiring harness adapter cost again.
              Assuming your M50 was a Vanos engine, you should be able to swap everything over to the S52 to convert it to OBD1. I recently did a similar swap (M50 to S52), and I was able to reuse the same wiring harness and harness adapter. I used the same ECU as well, just swapped out the chip for the S52 tune.

              Things to note with the S52 is that the stock crank sensor is at the back of the block, so you'll want to leave it there to keep the hole plugged, otherwise the OBD1 crank sensor provision is still present at the front like the M50. The Vanos solenoids have different cable lengths between OBD1 and OBD2, but they swap easy with a 32mm wrench. The last bit is the need for an adapter fitting to make the OBD1 coolant hose work, as the S52 uses a coolant pipe. Hopefully this helps.

              Comment


                What throttle cable are you guys using for your S50/ M50 swap cars? I purchased a e34 throttle cable already/ installed it on my car but it's so damn long.. On top of all this I'm not even sure if it's going to work with my OBD1 throttle body (my stock S50 throttle body) since no one ever makes it clear if the e34 throttle cable is compatible with both OBD1 and OBD2 engine swaps. I plan on installing the engine this weekend and want to have everything on hand.

                Edit: e34 cable works perfectly with a OBD1 S50 throttle body.
                Last edited by KIRIEIW; 10-30-2018, 06:53 PM.


                1992 M tech 2 Convertible - S50 Swap
                1992 e34 Touring- Currently Building.. S50 Swap
                1995 e36 M3 Mugello Red - S50
                1991 325i Convertible Laguna Green (SOLD)
                1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
                1988 325i Convertible Alpine White (SOLD)
                1991
                Brilliantrot Convertible 80k Miles (SOLD)
                1992 325i Convertible Schwarz (SOLD)
                1992 318i Convertible Project-Finished (SOLD)

                Comment


                  Thinking of using my existing G260 on my M52b28.


                  I know I will need to modify both the shift selector rod and trans mount.




                  Can I use the M20b25 single mass flywheel, clutch, TOB, etc ?


                  Anything else I'm overlooking?

                  '87 BMW E30 325is (restomod)
                  '90 Mazda Miata NA
                  '04 Jeep TJ
                  '05 Yamaha R6 (trackbike)

                  Comment


                    Originally posted by Panici View Post
                    Thinking of using my existing G260 on my M52b28.


                    I know I will need to modify both the shift selector rod and trans mount.




                    Can I use the M20b25 single mass flywheel, clutch, TOB, etc ?


                    Anything else I'm overlooking?
                    Below is from the swap notes I have culled from r3v 24v swap posters who were gracious enough to post their experiences. Unfortunately I did not save the posters information for credit where it is due.


                    "The pilot needs to match the trans. ie ZF is an e36 328/m3, so purchase the pilot for that.

                    Starter needs to match ring gear on flywheel. So purchase the starter for the FW you have.

                    Slave matches trans.

                    TOB matches clutch set (BTW m50/s50/m20/m42 use the same depth). *note* "some" people had issues with the dual mass m20 to SM conversion on the TOB. The only DM m20 FW I have seen is the late eta.

                    The m20 FW has a large protrusion on the engine side that will contact the RMS housing on a 24v (or m42), so you can either shave the FW, shave the RMS housing, or some people put the bolt ring on the back of the FW (the 6 bolt ~3mm thick ring that goes on the clutch side of the FW normally)."


                    I have the G260 trans with 99 S52 motor, I used the aluminum cup / rubber transmission mounts on the 15* transmission bracket I purchased from a forum member, the delrin tranny mounts were way to harsh of a ride. Also not all of the tranny bolts mate up to the motor, just the 5 or 6 larger bolts if I remember correctly, none of the smaller bolts align.
                    I lightened the flywheel to 11.5 pounds when the machine shop shaved the back of the SM flywheel to clear on the engine side and it now r3v's gloriously.
                    I didn't do the rear seal and wish I had.

                    Good luck!

                    Comment


                      Originally posted by Panici View Post
                      Thinking of using my existing G260 on my M52b28.

                      I know I will need to modify both the shift selector rod and trans mount.

                      Can I use the M20b25 single mass flywheel, clutch, TOB, etc ?

                      Anything else I'm overlooking?
                      I'm in the middle of the same swap (g260/m52b28) and have everything else put back together, just have to put it back in the car now.
                      I used the Garagistic trans mount brace to account for the 10% twist of the tranny.
                      Also had a machine shop shave down the m20 single mass flywheel. I'd have to look up how much they shaved off.
                      Clutch and TOB were both M20 parts as well as most of the other components needed. I can get you my parts list if you want as I also went in and refreshed some of the transmission components.

                      Comment


                        Originally posted by schmidty View Post
                        I'm in the middle of the same swap (g260/m52b28) and have everything else put back together, just have to put it back in the car now.
                        I used the Garagistic trans mount brace to account for the 10% twist of the tranny.
                        Also had a machine shop shave down the m20 single mass flywheel. I'd have to look up how much they shaved off.
                        Clutch and TOB were both M20 parts as well as most of the other components needed. I can get you my parts list if you want as I also went in and refreshed some of the transmission components.

                        Did you stay OBD2? What are you doing for the FPR if you went OBD1? (Fuel Pressure Regulator)
                        1990 325is
                        m52b28
                        3.73lsd
                        g260 (1987 325is 5spd tranny)

                        Comment


                          Originally posted by TeXJ View Post
                          Did you stay OBD2? What are you doing for the FPR if you went OBD1? (Fuel Pressure Regulator)
                          I am staying OBDII... Still have a lot to figure out on the fuel and cooling side if things.
                          I'll probably be running some sort of external FPR.

                          Sent from my Pixel 3 using Tapatalk

                          Comment


                            Just an FYI on the FPR, The early model e39 528i cars came with an fpr on the fuel rail like the m50 motors. I just got one and will need to install it on mine. I am obd1 and wish it was obd2.
                            1990 325is
                            m52b28
                            3.73lsd
                            g260 (1987 325is 5spd tranny)

                            Comment


                              Originally posted by TeXJ View Post
                              Just an FYI on the FPR, The early model e39 528i cars came with an fpr on the fuel rail like the m50 motors. I just got one and will need to install it on mine. I am obd1 and wish it was obd2.
                              Honestly, right now I'm looking for the quickest easiest way to get it running and I figure an external FPR would be easier than installing a new fuel rail.... but maybe I'm wrong...

                              Sent from my Pixel 3 using Tapatalk

                              Comment


                                Originally posted by bradmer View Post
                                Below is from the swap notes I have culled from r3v 24v swap posters who were gracious enough to post their experiences. Unfortunately I did not save the posters information for credit where it is due.
                                Amazing, thank you!



                                Originally posted by schmidty View Post
                                Also had a machine shop shave down the m20 single mass flywheel. I'd have to look up how much they shaved off.
                                Clutch and TOB were both M20 parts as well as most of the other components needed. I can get you my parts list if you want as I also went in and refreshed some of the transmission components.
                                Parts list would be great for reference.

                                Absolutely necessary to shave down the m20 single mass flywheel? What happens if you skip this?

                                '87 BMW E30 325is (restomod)
                                '90 Mazda Miata NA
                                '04 Jeep TJ
                                '05 Yamaha R6 (trackbike)

                                Comment

                                Working...
                                X