Results 1 to 14 of 14

Thread: Best Turbo my plans? E34 535i

  1. #1
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles

    Best Turbo my plans? E34 535i

    I'm in the planning phase of my turbo build for my 1990 535i. I want some turbo noise and a bit more power but I'm not power hungry (yet). This is going to be pretty cliche but it's a budget build. I plan to do 4-5 psi with no tuning for a while and then run 10 to 15psi on mega-squirt. This is street car and I want quick spool more than anything. I was thinking HY35 because they're cheap and would spool fast. However I've read that they would be too little for even an m20 and the top end would be heavily restricted. H1C? Hx35? HX52?
    Moderator and Owner of the Subreddit r/E34

  2. #2
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Bump.


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  3. #3
    Join Date
    Apr 2006
    Location
    Minnesota eh?
    Posts
    5,678
    My Cars
    86 325es
    There is no amount of boost that will safely work with no tuning or fueling modifications. The stock injectors are basically maxed out in stock form. A rising rate fuel pressure regulator can be made to work with a few pounds of boost and the flap door air flow meters used on the m30's. I did it for a short time back in the day. HX35 with an aftermarket turbine housing would be a decent place to start. Get a wideband AFR meter so you have some idea whats going on.


    86 325es, 2.8L m50, S476sxe, MS3pro Ultimate, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    9.17 @ 149.33 mph, 1.30 60 foot

  4. #4
    Join Date
    Jun 2005
    Location
    south
    Posts
    2,762
    My Cars
    85 318i
    I would suggest a T4 HX40 for the M30 if you plan to turn it up to 15psi.
    My manifolds powering 8sec and over 1000rwp cars
    Home of the highest HP stock M30 in the world 550rwhp/622rwtq
    1/4 mile---> 9.81 @138 C4 Auto
    10.08 in car vid --->https://youtu.be/OiinFhUomjg
    Dyno vid... http://www.youtube.com/watch?v=C7aM7..._order&list=UL

  5. #5
    Join Date
    Feb 2017
    Location
    Stevens PA
    Posts
    103
    My Cars
    1998 M3, TT stg2
    Quote Originally Posted by Spaceturtle917 View Post
    I'm in the planning phase of my turbo build for my 1990 535i. I want some turbo noise and a bit more power but I'm not power hungry (yet). This is going to be pretty cliche but it's a budget build. I plan to do 4-5 psi with no tuning for a while and then run 10 to 15psi on mega-squirt. This is street car and I want quick spool more than anything. I was thinking HY35 because they're cheap and would spool fast. However I've read that they would be too little for even an m20 and the top end would be heavily restricted. H1C? Hx35? HX52?
    Then your plan is to save up until you can do it right. If you don't have money for tuning, then you certainly don't have money to blow on another engine.

  6. #6
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Quote Originally Posted by someguy2800 View Post
    There is no amount of boost that will safely work with no tuning or fueling modifications. The stock injectors are basically maxed out in stock form. A rising rate fuel pressure regulator can be made to work with a few pounds of boost and the flap door air flow meters used on the m30's. I did it for a short time back in the day. HX35 with an aftermarket turbine housing would be a decent place to start. Get a wideband AFR meter so you have some idea whats going on.
    HX35 is probably what Iíll go with. I was thinking of making an adapter manifold, any experience with that?


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  7. #7
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Quote Originally Posted by wgknestrick View Post
    Then your plan is to save up until you can do it right. If you don't have money for tuning, then you certainly don't have money to blow on another engine.
    The sad truth. However, if I use a wideband and monitor it, if the fuel is right. I shouldnít really have to worry about preignition at 4-5psi. So it seems like i would be okay, but i might just be stupid.


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  8. #8
    Join Date
    Oct 2010
    Location
    Huntsville, AL
    Posts
    1,866
    My Cars
    95 M3
    You would be amazed at what you can do with a non tuned L-jet system. I was able to change injectors, run e85, adjust the AFM to load more fuel with the larger injectors and boost the snot out of an 1984 m10. The car made 250 to the wheels at just 15#s of boost on the stock Ecu running e85.

    I think we are all a little stupid for boosting our cars, but stupid is what stupid does. Personally I think the hx35 is to small for the m30, but then again, I ran an hx35 on my M10 to 30psi and felt it was great for power delivery.

    good luck.
    WOT

  9. #9
    Join Date
    Apr 2006
    Location
    Minnesota eh?
    Posts
    5,678
    My Cars
    86 325es
    Quote Originally Posted by hsvturbo View Post
    You would be amazed at what you can do with a non tuned L-jet system. I was able to change injectors, run e85, adjust the AFM to load more fuel with the larger injectors and boost the snot out of an 1984 m10. The car made 250 to the wheels at just 15#s of boost on the stock Ecu running e85.

    I think we are all a little stupid for boosting our cars, but stupid is what stupid does. Personally I think the hx35 is to small for the m30, but then again, I ran an hx35 on my M10 to 30psi and felt it was great for power delivery.

    good luck.
    I agree, I think we all tend to forget that people were turboing these cars before megasquirt existed. An HX35 will be right on the money for 5 lbs, a bit small for 15. But if you buy a used one and don't ruin it you'll be able to resell it for what you paid for it.


    86 325es, 2.8L m50, S476sxe, MS3pro Ultimate, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    9.17 @ 149.33 mph, 1.30 60 foot

  10. #10
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Quote Originally Posted by someguy2800 View Post
    I agree, I think we all tend to forget that people were turboing these cars before megasquirt existed. An HX35 will be right on the money for 5 lbs, a bit small for 15. But if you buy a used one and don't ruin it you'll be able to resell it for what you paid for it.
    This is just the answer I was looking for. I donít think itíll be too small. I want low down torque, Iím not looking for high revving horsepower. This is just a street car and nothing more.

    Oh but the power hunger will set in. Ill be like ya this is good. Next day Iíll do forged internals and run it 700rwhp.


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  11. #11
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Quote Originally Posted by hsvturbo View Post
    You would be amazed at what you can do with a non tuned L-jet system. I was able to change injectors, run e85, adjust the AFM to load more fuel with the larger injectors and boost the snot out of an 1984 m10. The car made 250 to the wheels at just 15#s of boost on the stock Ecu running e85.

    I think we are all a little stupid for boosting our cars, but stupid is what stupid does. Personally I think the hx35 is to small for the m30, but then again, I ran an hx35 on my M10 to 30psi and felt it was great for power delivery.

    good luck.
    Isnít the afr for e85 different though? How did that work with no tune?


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  12. #12
    Join Date
    Oct 2010
    Location
    Huntsville, AL
    Posts
    1,866
    My Cars
    95 M3
    Quote Originally Posted by Spaceturtle917 View Post
    Isnít the afr for e85 different though? How did that work with no tune?


    Sent from my iPhone using Tapatalk
    Yes, AFR is different.

    i would advice against a non tuned e85 turbo build. It was just no fun at all.
    WOT

  13. #13
    Join Date
    Nov 2017
    Location
    Grand Haven, MI
    Posts
    116
    My Cars
    1990 535i 428k miles
    Quote Originally Posted by hsvturbo View Post
    Yes, AFR is different.

    i would advice against a non tuned e85 turbo build. It was just no fun at all.
    Yeah I wasnít planning to


    Sent from my iPhone using Tapatalk
    Moderator and Owner of the Subreddit r/E34

  14. #14
    Join Date
    Jul 2005
    Location
    California
    Posts
    591
    My Cars
    Bima
    5psi is an unreasonable goal to set
    like saying just the tip baby only for a second, c'mon.
    yea right! We can set u up but you can't be broke.
    Homemade adapter manifold works good i ran one for a long time.

Similar Threads

  1. My RHD E34 535i 5spd Turbo
    By dmh2907 in forum 1988 - 1996 (E34)
    Replies: 31
    Last Post: 01-10-2015, 11:53 AM
  2. My Red E34 535i turbo MS1
    By Dan Miller in forum 1988 - 1996 (E34)
    Replies: 91
    Last Post: 01-29-2010, 02:28 AM
  3. random pics of my sis e34 535i
    By c1rca in forum BMW Rides & Events
    Replies: 2
    Last Post: 06-01-2006, 09:11 PM
  4. My new e34 535i
    By jonnyc in forum 1988 - 1996 (E34)
    Replies: 7
    Last Post: 05-24-2005, 02:42 AM
  5. My beautiful E34 535i 5 speed is for sale...
    By SehrSchnell in forum BMW Cars For Sale / Wanted
    Replies: 13
    Last Post: 02-12-2005, 01:06 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •