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'94 E34 Touring slicktop, daily driven slow mover. 3L turbo M50 in progress

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    #16
    I've been following on ig when I see posts, but I think it "hits different" when I see the detailed updates here.

    Looking really good.
    Originally posted by priapism
    My girl don't know shit, but she bakes a mean cupcake.
    Originally posted by shameson
    Usually it's best not to know how much money you have into your e30

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      #17
      I haven't been documenting it very well but I've had a couple of updates, I dropped the block and internals off at the machine shop for the block to be bored and cleaned, rod bushings sized. No ETA. Was hoping to have it done by the end of April but that looks unlikely. Sorry, all phone pictures here. I'll probably document the build itself better with my real camera.

      I got my rapid spool header, it's nice and shiny. I'm concerned about wastegate routing, it's not going to be easy to route it around to the downpipe. I do not do screamer pipes, they are idiotic. Toward the end of my tuning career I refused to tune cars with them because it made it impossible to hear mild detonation, and the noise could trigger false knock detection on some cars if the exit was near the block.
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      I verified that I can fit an intercooler between the condenser and radiator by eliminating the mechanical fan. I may have to upgrade the stock pusher fan and will put a small fan or two in the corners of the radiator if they'll fit. 4-3/8" from radiator to fan trailing edge. So no water to air intercooling for me. I'm still in the decision making phase for intercoolers, difficult because my flow demand is around 1,100cfm and I do not feel I have room for a vertical flow intercooler with the radiator core being 21" wide and 18" tall, it would require hacking a lot of sheet metal which I'm trying to avoid.
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      Replaced my driveshaft with a used one on ebay, the CSB was completely torn apart because one axis of the u joint was basically locked up, below is a screenshot from a video I took so it's terrible quality. I had to just barely touch the throttle until 20mph or so or the driveshaft would knock around horribly. It squeaked at low speed which was annoying while commuting.
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      The ebay driveshaft arrived with a little bit of notch to the u joints that wasn't apparent with it assembled, and it vibrates just a little at low speed and full throttle from a stop but it was cheap and it's not anywhere near as bad as before. I think it'll last until I have the new drivetrain ready to go. On the plus side with the driveshaft out I was able to verify that the $200 535i driveshaft I bought, which has a greaseable, clipped u joint, will work with the ZF310. That's a major win. Protip for E34 525i owners: you do not have to remove the exhaust to remove the driveshaft, just undo the mounts and prop it up, I used my transmission jack for that. There are two mounts on the muffler, one is a real pain to get to.

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      Oh and I bought a new key from a dealer so I have a master with which to cut duplicates instead of duplicating the worn out one that came with the car. A key is now twice the price I paid for my E30 key years ago somehow so there's that.

      (EDIT)
      I also bought a dragy, which is an interesting little gadget though it is annoying that it doesn't have an off switch. I bought it because can be used to do timed 3rd gear pulls for A-B testing which is critical for good tuning especially with a powerful car. It's a lot easier than using logs to see the elapsed time of a pull. I did a few 0-60 and 1/4mi runs with the wagon, it's so slow 0-60 in 9.77s/9.52s with 1ft rollout, best 1/4mi 17.45s, best trap 80mph. Related news, my local drag strip is closing this month so it will be difficult to do any drag strip runs, a drive of a few hours will need to be made to do so.
      Last edited by varg; 04-02-2022, 04:49 PM.

      IG @turbovarg
      '91 318is, M20 turbo
      [CoTM: 4-18]
      '94 525iT slicktop, 3L M50 + BW S366 project

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        #18
        Solid update.
        Simon
        Current Car:
        -2017 i3 REx, 21st Century E30
        -1975 Alfa Romeo Giulia Nuova Super 1300, the never-ending name & project



        Make R3V Great Again -2020

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          #19
          I reckon the wastegate will be fine, as long as you don't run a massive one.
          sigpic

          (clicky on piccy to get to thread)

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            #20
            Slicktop wagon owners unite. Loving the way the wheels look on there.
            Project Thread | Instagram

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              #21
              Subscribing, project is looking good Tyler!

              RISING EDGE
              Let's drive fast and have fun.

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                #22
                Thanks, guys. I really do like this car despite its flaws and slowness. It is a good car. 269,000mi on it and it runs well and is quiet and comfortable. With its rarity and unusual wheels it gets a lot of attention, which is a bit of a drawback outside of a car show.

                Seems everything in this project has been majorly delayed. I recently got the block back, it's a thing of beauty. Clean, ready to be painted, O-ringed, and oil pump chain tensioner installed. I had ForcedFirebird do the decking, cleaning, freeze plugs, drill the holes for, and install the tensioner pins for me.
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                Using the wagon as it was intended to be used.
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                With the build so delayed I got the AC working. E34 525i AC lines are in the worst possible place for a turbo car, right where the turbo and downpipe need to be. Conveniently E34 530/540i lines are a lot closer to what you need, but I still had them modified by the hydraulic shop for maximum clearance.
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                Continued...

                IG @turbovarg
                '91 318is, M20 turbo
                [CoTM: 4-18]
                '94 525iT slicktop, 3L M50 + BW S366 project

                Comment


                  #23

                  The modified lines installed.
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                  And the downpipe stand-in. A piece of 4.25" OD flexible dryer duct. Very close, but it fits. Will not be fun to fabricate. The downpipe crossover tube will also be a real treat.
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                  While I had the AC apart I cleaned an ungodly amount of gunk and debris out of the radiator support and passenger side frame rail, and got rid of the grungy old tube and fin condenser.
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                  Replaced with a nice junkyard find; a parallel flow condenser.
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                  And the result, cold AC even in traffic at 88°F and 71% relative humidity.
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                  I'm going to paint and assemble the longblock over the next couple of weeks and use that time to make my intercooling decision. I do not know which path I will take.
                  • Air to air between condenser and radiator
                  • Air to water with a heat exchanger between condenser and radiator.
                  Neither is optimal. Air to air is cheaper, lighter, and more reliable... but the intercooler will obstruct airflow and put the radiator too close to the engine for anything other than a couple of small fans mounted directly to the radiator wherever the accessories don't interfere. Even the best 16" pusher fan will move nowhere near enough air to cool the engine with the AC on while blowing through an AC condenser and 3.5" thick intercooler. Air to water would solve that issue but there isn't a good place to put any off the shelf intercooler large enough for my application. My measurements lead me to believe that the airbox mounting area is too small, and I would have to build a custom unit from a Garrett core. Even if I did have an AC TIG welder, I'm nowhere near good enough to weld up a custom intercooler. I also have the task of building a differential ahead of me, I need to take the 2.93 LSD I have out of an E30 case, rebuild it, and put it in an E34 case. Not trivial. If only BMW hadn't screwed us by putting a 1:1 fifth gear in the ZF310/320
                  Last edited by varg; 07-09-2022, 06:28 PM. Reason: Fixed pictures

                  IG @turbovarg
                  '91 318is, M20 turbo
                  [CoTM: 4-18]
                  '94 525iT slicktop, 3L M50 + BW S366 project

                  Comment

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