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Thread: Puff's "What's A Turbo?" '95 E34 Build Thread

  1. #76
    Join Date
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    Quote Originally Posted by CallMePuff View Post
    I've been toying with the idea of flex-fuel. I'm in the cities, so E85 should be available enough but I also want to be able to travel a bit if I need/want to. Can anyone weigh in on this? Is it difficult to set up? Bear in mind I've done no research at this point lol.
    Prepare to get about 120mi per tank.

    Setup for me was just scaling the fuel table and good to go.
    i highly recommend switching to the e85 pump. it's alittle bit more but my m30 maxed the 255 at only 450hp.
    we all know you won't be completely happy with 350hp for long.
    Last edited by Robocop; 09-20-2018 at 11:52 PM.

  2. #77
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    Flex fuel with megasquirt is easy to setup and you can do a lot of cool stuff with it like boost targets set to ethanol percentage. Everything else about E85 is a pain in the ass. Have to find an E85 station to fill up. Gas mileage is horrific. Have to have huge injectors, fuel lines, special fuel filter, bigger regulator, bigger pumps, and it does nasty stuff if left in the tank over winter. When you get to the 600+ whp level though it’s like magic the power you can make with it and not blow stuff up. It’s like dating a really high maintenance girl that’s wild in bed.
    Last edited by someguy2800; 09-21-2018 at 02:16 AM.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  3. #78
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    Quote Originally Posted by someguy2800 View Post
    Flex fuel with megasquirt is easy to setup and you can do a lot of cool stuff with it like boost targets set to ethanol percentage. Everything else about E85 is a pain in the ass. Have to find an E85 station to fill up. Gas mileage is horrific. Have to have huge injectors, fuel lines, special fuel filter, bigger regulator, bigger pumps, and it does nasty stuff if left in the tank over winter. When you get to the 600+ whp level though it’s like magic the power you can make with it and not blow stuff up. It’s like dating a really high maintenance girl that’s wild in bed.
    Hahaha love the analogy, but yes it does sound like a pain in the ass. I'll probably avoid it unless necessary, since my power levels aren't anywhere near 600 and it's my daily driver so I could use that gas mileage. The budget would absolutely not fit a conversion to support flex fuel, although I do have an Aeromotive 340LPH on the way.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  4. #79
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    Hey guys, it's been a little bit. The car is ready to rock and roll (almost).

    I've got EVERYTHING installed; megasquirt, gauge, fuel pump, turbo, manifold, engine, wastegates, plumbing, vacuum hoses, and everything else that encompasses this whole thing.

    I'm ready to start the car, but I'm getting a crank no start. After fiddling around, I determined there was no fuel getting to the injectors. Fuel pressure builds up in the firewall-side fuel line before the FPR, then it seems to never make it past the FPR.

    I've verified that the vacuum hose is connected properly and isn't squished. Could this be a seized FPR? I suppose it could also be a blockage in the fuel rail or lines, but seems unlikely as I closed them off well enough when I unplugged things.

    I tried taking the fuel rail off and blowing through the fuel port, and I can't blow any air through. Does this mean anything or is that normal?

  5. #80
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    Sounds like you're not getting injector pulse. Lift the fuel rail from the manifold, put the injector tips in clear sandwich bags, then crank to verify fuel is getting through.

    The FPR at the end of the rail should hold pressure up to about 43.5psi, so unless you have some gnarly lungs blowing through it won't do anything.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  6. #81
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    Quote Originally Posted by CSBolger View Post
    Sounds like you're not getting injector pulse. Lift the fuel rail from the manifold, put the injector tips in clear sandwich bags, then crank to verify fuel is getting through.

    The FPR at the end of the rail should hold pressure up to about 43.5psi, so unless you have some gnarly lungs blowing through it won't do anything.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    I'm embarrassed enough to delete my original question, but I won't because I want people to see my stupid mistakes.

    My 8 or so hours of investigating led to one big conclusion:

    My fuel feed and return lines were swapped.

    I hate cars. But I also love this one again now that it runs! Stay tuned for video and/or tuning woes.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  7. #82
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    So I'm tuning the Megasquirt and the thing runs, but I keep reading that the timing should be confirmed with a timing light to ensure the angle is what the MS says it is. I also read that this isn't applicable to toothed wheel setups.

    Should the timing check be done or does it not apply for us?

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  8. #83
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    I always check with a light just to be sure. If you have the polarity of the vr sensor backwards it will work but the timing will be a couple degrees off. Also my ms2 and ms3 required different settings of the tooth offset to get the timing right. It have a timing light if you want to check it next week.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  9. #84
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    Quote Originally Posted by someguy2800 View Post
    I always check with a light just to be sure. If you have the polarity of the vr sensor backwards it will work but the timing will be a couple degrees off. Also my ms2 and ms3 required different settings of the tooth offset to get the timing right. It have a timing light if you want to check it next week.
    Sounds good. I might just run out and pick one up as I took tomorrow off to tune. I'm wondering about the VR sensor. I performed the realtime test in TunerStudio when cranking and noted that the display was showing two long teeth and the little sync loss graph was lighting up a bit. The MS3 Setup pdf on msextra tells me to either switch polarity on the sensor or change to Rising Edge. I switched it to Rising Edge and the motor runs like this, but I'm not sure if I should just swap the wires on my harness? One of the wires is shielded while the other is not I think, so I'm thinking that might contribute to the sync loss.

    Edit: Checking my handy dandy wiring spreadsheet I made, I ended up wiring the positive CKP signal from the sensor to the CKP negative wire on the MS3, and vice versa. Is this correct? I pulled that knowledge from someone else's pinout
    Last edited by CallMePuff; 10-18-2018 at 09:13 PM.

  10. #85
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    I rewired the crankshaft sensor and that looks to have cleared up the sync loss issue.

    I'm running into issues with the engine shaking while it runs. It's not at all smooth lol.

    It was rich initially, but I leaned it out to idle around 14.7 and it still shakes.

    Any ideas? I only have an M50TU stock DME and not the M52 DME to check.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  11. #86
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    Is it running on all 6 cylinders? check by disconnecting a coils one at a time. What ignition timing?


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  12. #87
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    Quote Originally Posted by someguy2800 View Post
    Is it running on all 6 cylinders? check by disconnecting a coils one at a time. What ignition timing?
    Apparently not.

    What I did was turn the car off, pull a coil plug, start the car and see if it idled.

    The car was idling (with vibration) with all 6 plugged in, so that was my benchmark.

    Starting from the front, all failed except for when the 4th coil plug was unplugged. It ran identically.

    I'm going to check my wiring in the adapter harness for that plug. Anything else?

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  13. #88
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    If unplugging that coil while running makes no difference then its either not firing the coil, not firing the injector, or the spark plug is smashed shut. Check the wiring and check both the injector and coil connector with a 12v test light to see if it pulses while cranking.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  14. #89
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    Quote Originally Posted by someguy2800 View Post
    If unplugging that coil while running makes no difference then its either not firing the coil, not firing the injector, or the spark plug is smashed shut. Check the wiring and check both the injector and coil connector with a 12v test light to see if it pulses while cranking.
    It turns out that unplugging 2, 4, and 6 doesn't change anything. This thing seems to be running on 3 cylinders. I just checked the physical connections from the 55pin to the coil drivers and they seem fine. I'm wondering if it's a setting or something?

    I have each coil driver wired to an individual coil on the 55pin. I know I had read some people were grouping pairs of coil drivers together, but they seemed to be older versions of MS.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  15. #90
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    SOLVED IT. I had it set to wasted spark lol.

    Switched it to COP and it works smooth as butter.

    Now my idle is sort of oscillating. Gonna do some research. It sounds good though

    Sent from my Nexus 6P using Tapatalk
    Last edited by CallMePuff; 10-19-2018 at 01:33 PM.
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  16. #91
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    I turned my idle VE table off and that resolved the idle moving around on its own. Seemed like it kept jumping between the idle table and normal table.

    Now I'm attacking it running super rich. It stays around 9-10 AFR at idle. I've been playing around with the VE table, but I feel like I'm getting into really low numbers and it doesn't seem to be changing much.

    I have to assume I might have the injector settings incorrect or something.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  17. #92
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    can you email me the tune file?


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  18. #93
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    Quote Originally Posted by someguy2800 View Post
    can you email me the tune file?
    Sure can. PM me your email!

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  19. #94
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    Fellas...

    I've caught the bug. I've been playing around with the tune in MS and have gotten it running decently. It runs rich-ish and has ultra-conservative timing, but Someguy2800 should be rolling with me this week to sort it out more.

    I've still got a PTE Turbo Blanket on the way and need to run a tube from the CCV port to the ground at the very least. Probably spraying a nice oil mist out of there under WOT lol.

    Anyways, here's a couple videos:

    https://youtu.be/S1CmtSi4iVE
    https://youtu.be/dgWVvPRVCdM

  20. #95
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    Car is tuned substantially better, thanks to Someguy2800!

    Time to tackle my next problem, which is losing oil. For context, the bottom end of this motor is an M52 block with something like 213k on it. For CCV, I just have the stock fitting with a hose connected to it running to the ground.

    In the less-than-a-week that I've been driving the car, there have been little oil puddles under that hose once the car sits and my oil warning has come on.

    Am I supposed to be losing this much oil? Would adding a filter or pointing the hose up at the end help at all?

    I'm hoping this isn't going to be regular thing

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  21. #96
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    Good reading and wish you the best. I really envy people who have the time and skill to DIY tuning.
    22RPD Tuning '95 540i/6 custom turbo mit Borg Warner S400sxe/Rebello Racing 4.9L M62/JE pistons/Arrow rods/custom cams/S62 crankshaft/Darton sleeved/Focal custom stereo
    Porsche 996 Turbo Evosport GT 700-[700hp]-my daily

  22. #97
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    Quote Originally Posted by jimmyz66 View Post
    Good reading and wish you the best. I really envy people who have the time and skill to DIY tuning.
    Thanks buddy. It's quite the journey.

  23. #98
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    1995 BMW 525i/5
    Installed my Vibrant catch can that vents to atmosphere. Thing looks sweet, the AN lines are unnecessary and expensive but look sweet, the motor seems to breathe a lot better with the extra hose diameter.

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

  24. #99
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    Do I see two BOV's?

  25. #100
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    Quote Originally Posted by Vexatus View Post
    Do I see two BOV's?
    Lol you do not. Where are you seeing what looks like a second one?

    Sent from my Nexus 6P using Tapatalk
    '95 E34 525i, M50B32 (S52 Crank, K1 Rods, JE 9.0:1 Pistons, S52 Cams, Cutring, Achilles Oil Pump Shaft & Sprocket), GTW3684R 0.82A/R, ZF320

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