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Thread: Chikinhed's Mini Build

  1. #726
    Join Date
    Apr 2006
    Location
    Minnesota eh?
    Posts
    6,155
    My Cars
    86 325es
    That chart you posted makes no logical sense on a turbo charged motor. It makes no reference to displacement or air density as to how they came up with those numbers. The only thing of importance when sizing piping between the turbo and the motor is the air velocity through the piping, which is determined by the displacement, rpm, and volumetric efficiency. When you pressurize the intake none of those variables change, you just increase the air density. So if the size is correct for an NA motor it will also be correct for 25 lbs or 50 lbs of boost.


    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

  2. #727
    Join Date
    Jun 2011
    Location
    Vancouver, BC Ca
    Posts
    3,255
    My Cars
    1993 325is
    Brad,

    Is that the TB that you got from me? If so I fussed with it for a couple weeks when I 1st installed it, and got it working 100% perfectly. I'm not sure where the problem could be coming from. Could the bolts attaching it to the IM be unevenly torqued and twisting the TB at all? I played with the throttle stop screw fairly extensively, and when 1st installed, took it off once or twice to "adjust" the butterfly as well as creating a "Honda" like seal between the butterfly and the bore (thin coat of paint between the butterfly edge and the TB bore that then gets "broken" by opening the butterfly).


    If that's not my old TB, ignore all of the above.

  3. #728
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
    Posts
    8,162
    My Cars
    '97 M3
    Yours was an OBD1, I traded it for an OBD2 version.

  4. #729
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    Maybe with the gutted shaft there is not enough strength so there is some movement with boost pressure. If you think that is a possibility, could you swap in a full shaft?

  5. #730
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    8,162
    My Cars
    '97 M3
    It could be a shaft issue. The VAC 70 mm is not to be used for FI, it doesn’t even have a shaft.
    Last edited by chikinhed; 04-27-2019 at 06:54 PM.

  6. #731
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
    Posts
    8,162
    My Cars
    '97 M3
    I have developed an exhaust tick at the back of the engine. I just confirmed that it’s at #6 exhaust port so the turbo and manifold have to come back off

  7. #732
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    Use the thicker OBD1 gaskets.

  8. #733
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    My Cars
    '97 M3
    I begrudgingly removed the turbo, down pipe and Steed to to fix the exhaust leak at #6 exhaust port. Once the Steed was off I could clearly see what the issue was. The Steed flange had warped. I had the surface machined and the machinist had to remove 0.085” to get it flat again. There was no chance of the gasket sealing with it like that. I will now do a pre installation inspection of the turbo manifold flange before installing each time...... I’ve learnt my lesson, I’m not looking forward to re installing everything again.
    Last edited by chikinhed; 05-05-2019 at 11:21 AM.

  9. #734
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    8,162
    My Cars
    '97 M3
    Since the car is up on stands again I decided to finish up a bunch of smaller projects on the to do list. The diff cover mods are finally done except for the welding and the hole for the speed sensor. I’m excited about this mod.






  10. #735
    Join Date
    Oct 2005
    Location
    Northern California
    Posts
    3,138
    My Cars
    95 M3, 15 Golf TDI wagon
    Looks awesome! Whats the reason for the half moon cut out? The factory speed sensor will go in that?
    Last edited by 3literheater; 05-05-2019 at 11:17 PM.

    -WTB: OEM Class 2 LTW GT wing with risers- Mazak

  11. #736
    Join Date
    Aug 2007
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    Vancouver, B.C., Canada
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    '97 M3
    Yup, the e46 M3 cover doesn’t have a fill plug or a speed sensor.

  12. #737
    Join Date
    Jan 2009
    Location
    Geigertown, PA
    Posts
    547
    My Cars
    95 M blk/blk
    Quote Originally Posted by chikinhed View Post
    I begrudgingly removed the turbo, down pipe and Steed to to fix the exhaust leak at #6 exhaust port. Once the Steed was off I could clearly see what the issue was. The Steed flange had warped. I had the surface machined and the machinist had to remove 0.085” to get it flat again. There was no chance of the gasket sealing with it like that. I will now do a pre installation inspection of the turbo manifold flange before installing each time...... I’ve learnt my lesson, I’m not looking forward to re installing everything again.
    That is incredible that the manifold flange warped!??! The manifold is soo freaking heavy and beefy I cant believe that would happen. Glad you figured it out, but bummer you had to go through all this.
    96 328i ITR Racecar
    95 M3 blk/blk - hillclimb project - http://forums.bimmerforums.com/forum....php?t=1798796 - Retired to street duty after two awesome seasons!
    2002 325XiT - daily


  13. #738
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    My Cars
    '97 M3
    I picked up some OBD1 exhaust gaskets. They may be slightly thicker but the port size is quite a bit smaller. The gasket would be exposed and unsupported on the manifold side which I’d be concerned about it being burnt and bits going through the turbo. The OBD2 exhaust gaskets have big enough ports so that the fire ring is compressed from both sides. In the pic below, the top is OBD1. The bottom pic shows the OBD2 on top of the OBD1.



    Last edited by chikinhed; 05-08-2019 at 07:35 PM.

  14. #739
    Join Date
    Jul 2005
    Location
    PEI, Canada
    Posts
    2,817
    My Cars
    2001 330i
    What do those gaskets look like on the cylinder head and exhaust manifold?

  15. #740
    Join Date
    Aug 2007
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    Vancouver, B.C., Canada
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    '97 M3
    The ports on the head are about the size of the OBD1 gaskets and the ports on the Steed manifold are about the size of the OBD2 gaskets.

  16. #741
    Join Date
    Jul 2005
    Location
    PEI, Canada
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    2001 330i
    I'm running the OBD1 gaskets with the Steed. They are slightly bigger than my ported M54 exhaust ports.

    I've had what most would consider to be obscene EGTs running high EBP and nitrous....and the gaskets haven't shown any signs of fatigue.

  17. #742
    Join Date
    Mar 2012
    Location
    Lansdale, Pa
    Posts
    7,043
    My Cars
    98 540 6, SC'ed, 16psi
    I'd be leery of not having the compression ring compressed in a sandwich.
    98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!

  18. #743
    Join Date
    Jan 2008
    Location
    Louisville, KY
    Posts
    10,141
    My Cars
    turbo m3
    Quote Originally Posted by PEI330Ci View Post
    I'm running the OBD1 gaskets with the Steed. They are slightly bigger than my ported M54 exhaust ports.

    I've had what most would consider to be obscene EGTs running high EBP and nitrous....and the gaskets haven't shown any signs of fatigue.
    Adam, what’s obscene?

  19. #744
    Join Date
    Jul 2005
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    PEI, Canada
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    2001 330i
    Quote Originally Posted by BadBoostedBmwM3 View Post
    Adam, what’s obscene?
    Over 1800 Deg F on individual cylinders, with over 40 PSI of exhaust back-pressure.

  20. #745
    Join Date
    Aug 2007
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    Vancouver, B.C., Canada
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    '97 M3
    I know that you are measuring EGT very close to the port but #6 runner is not very long. What turbo was that high EGT with?

    Max EGT (TIT) for the EFR is 1742°F.
    Last edited by chikinhed; 05-10-2019 at 09:16 PM.

  21. #746
    Join Date
    Jun 2005
    Location
    New England
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    25,402
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    F90 M5; E36 M3 Turbo
    If Adam was running a smaller turbo at the time and nos, the egt may be higher.

  22. #747
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    '97 M3
    Well, I got some stuff done....

    —Removed down pipe, turbo & exhaust manifold, fixed warped manifold flange and reinstalled everything
    —Routed stainless steel hard line from turbo to muffler valve
    —Replaced transmission shifter seal
    —Removed Dynomax 3.5” in/out muffler, swapped in modified Magnaflow muffler with valve, 3.5” in/dual 2.5” out, looks stock, valve opens at 7 psi boost
    —Removed Driveshaft Shop one pice driveshaft, installed modified stock driveshaft with new guibo and bolts
    —Tighten power steering lines
    —Hooked up oil cooler and changed oil filter
    —Installed Zeitronix ECA-2 and connected to ZT-2 and display
    —Replaced drivers door striker/switch

    All that took many hours, I can’t wait to drive it.

  23. #748
    Join Date
    Jul 2005
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    PEI, Canada
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    2001 330i
    Quote Originally Posted by chikinhed View Post
    I know that you are measuring EGT very close to the port but #6 runner is not very long. What turbo was that high EGT with?

    Max EGT (TIT) for the EFR is 1742°F.
    #5 and #1 were the hottest. #6 would be up there too if I had an accurate reading...however, I had a placement problem with it that I thought was a sensor fault.....but then found on tear-down that the tip wasn't in the exhaust runner at all. (I set the height of the sensors from the exterior of the manifold, without consideration for the bend that #6 has in the port)

    GTX3076R on 1.06 twin scroll

    I always wished I had gone with the GTX3576R.....

  24. #749
    Join Date
    Aug 2007
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    Vancouver, B.C., Canada
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    '97 M3
    Nothin’ like taking the car off jack stands and immediately doing a 400 km road trip through the mountains. The muffler and driveshaft swap are awesome. At highway speeds I had 75-80 dB (iPhone app) in the cabin, no drone
    and no driveshaft buzz.

  25. #750
    Join Date
    Aug 2007
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    Vancouver, B.C., Canada
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    '97 M3
    I put another 400 km on it again today all on twisties. So much fun!

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