Should I Port My .55 AR BEP Housing's Wastegate or not?

Posted by szutavern, May 17, 2017

Please Support Race Components Inc
  1. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Hey DSM freaks, Should I Port My .55 AR BEP Housing's wastegate port or not?

    Overtwisted my HTA68 and now replacing it with a HX40 with a BEP and external dump off O2

    Shooting for about 500hp this season +600 next and yes I have all the supporting mods that will get me there
    31psi
    2100 injectors on E85
    Tial 44 Wastegate external dump

    Lemme know your thoughts

    Mucho thanks

    Been trolling this site forever, first time posting question.
     

    Log in/Register to remove ads

    Attached Files:

  2. SOADweskey

    SOADweskey Proven Member

    760
    91
    Joined Dec 11, 2006
    Jacksonville, Florida
    I'm running a HX-35 in that housing. I have not ported my wastegate opening at all and during engine break in I had no trouble with my turbo maintaining the 17psi that my wastegate (Tial 38 MVS recirculated) spring was set at.

    Maybe someone with a HX-40 can chime in but for me there was no need to port it and boost creep was not a problem.
     
    My DSM:
    1999 Mitsubishi Eclipse GSX

    Street Build

    12.273 @ 113.55 MPH
    Loading...
  3. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    Anything you can do to reduce back pressure on that .55 housing will be good. I was running one and had problems on the hot side, getting all of the exhaust out that little hole. I broke 2 HX40's before I went to a .70 T3. I snapped one exducer off clean at the shaft and the other looked like this...

    20170427_162424 resized 50.jpg
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
  4. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Thanks 1990

    So port the sheeait outta it... is that what you would do?
     
  5. ceedawg

    ceedawg Supporting Member

    1,289
    201
    Joined Jun 2, 2004
    laurelton, New York
    Go .70 ar housing. More efficient,turbo will live and not be overworked. No porting necessary. 55 too much back pressure and has damaged many an hx40
     
    My DSM:
    Loading...
  6. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    thing is i have a .55 ready to go. Should I open it clear up to match the gasket?
     
  7. ceedawg

    ceedawg Supporting Member

    1,289
    201
    Joined Jun 2, 2004
    laurelton, New York
    Doesn't matter will still be too much backpressure. Big wheel in small turbine housing equals disaster. Sell it be patient and get a .70. Think long term not short term which will destroy your investment. Turbo that is. That 55 housing can be sold.
     
    Last edited: May 17, 2017
    My DSM:
    Loading...
  8. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    After breaking HARD parts like I did, I recommend exacly what ceedawg suggested and what I finally did, go .70 or larger. It is the throat of the housing that is to small. @JusMX141 can tell you the same thing that we are. I have tried to use the .55, but hurt turbo's, so I went with something that could breath a little better, per suggestions to me :) Now with a HX35, the .55 housing seems to be ok, it is just the HX40's.
    Justin (JusMX141) would be the guy to ask if porting that housing will help you, hey Jus, give this man a little input please.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
    Dstarperformance01 and ceedawg like this.
  9. jakelandry

    jakelandry Proven Member

    736
    57
    Joined Oct 13, 2009
    Minden, Louisiana
    How does opening the wastegate hole help reduce drive pressure? Wouldn't that mean you could just put the largest wastegate possible on the smallest exhaust housing and obtain great spool then just open the wastegate to have your exhaust housing flow better? Forget VGT technology i'm going purchase 5 wastegates off ebay instead.

    "The boost/backpressure ratios at different pressures and flows are set by the geometry of the turbo and cannot be altered by the wastegate. The wastegate can only be used to limit boost, the backpressure to drive that boost remains." -per random internet post I am sure will be disregarded. I'm fairly sure that the wastegate opening is only inadequate if you cant lower your boost however low you want it but I could be wrong.
     
    My DSM:
    1995 Mitsubishi Eclipse GSX

    11.410 @ 125.490 MPH
    Loading...
  10. red_devil

    red_devil Proven Member

    914
    24
    Joined Jul 13, 2005
    Cape Coral, Florida
    What boost levels where you guys having issues? The problem isn't helped by the poor o2 housing options we have either.
     
    My DSM:
    Loading...
  11. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Thing is the external dump O2 pipe will flow at least 2-3x what that BEP wastegate hole can flow. All I was worried about was controlling boost really. Much great help fellas. Keep it coming.
     
  12. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    Just to be clear, I never said opening it up would help. Justin has seen first hand what is happening with HX40's and the .55 BEP housing so I hope he chimes in. I have first hand experience that the dam thing chokes up and gets SUPER hot because it can't get out thru the THROAT, that is why I suggested .70 to save someone else the trouble. I hope that makes sense. You lose a little spool but it breathes better. It REALLY wants a bigger housing than a .70 to be honest.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
    ceedawg and Dstarperformance01 like this.
  13. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Yep understand, unfortunately I am ready to bolt this biatch up today, and I looked at the tiny wastegate hole in it and said WTH?

    Guess I'll just have to keep it under 7,000 RPM till I get the funds for another upgrade DAMMIT

    ; )
     
  14. jakelandry

    jakelandry Proven Member

    736
    57
    Joined Oct 13, 2009
    Minden, Louisiana
    I too suggest going bigger than the .55. Turbolab sells a .82 p-trim housing I believe for 150. I did log 63 lb/min through my .55 at 38 psi all the way up to 8k rpm however.
     
    My DSM:
    1995 Mitsubishi Eclipse GSX

    11.410 @ 125.490 MPH
    Loading...
  15. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    Yeah I would use it. With the .44 WG you will be better off. I am running the .38. It's small but it's all I had :)
    You can get your 500hp with it, just keeping you informed on what is happening with other setups!
    I had to go get my "Boost Fix" a second ago. I needed to move the car to put my sons toolbox in the garage....38lbs, 587ish :D so I feel better now. Good luck and if you have any more questions, that is what I WAS using and still have a BNIB .55 for another project so feel free to ask. I will tell what I have experienced. :thumb:
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
  16. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska

    Haha thanks homes much appreciate your help.
     
  17. iugrad92turbo

    iugrad92turbo Proven Member

    10,233
    271
    Joined May 22, 2007
    Kalamazoo, Michigan
    IL be running a hx40 in a .55 bep housing 10 blade turbo. This is a,street car any issues I'll be upgrading to a t3 set up from archer fabrication when the time comes. I got lots of tuning and work to do so well see.
     
    My DSM:
    1991 Eagle Talon TSi (sold)

      manual
    Loading...
    1990TSIAWDTALON likes this.
  18. 97gsxIA

    97gsxIA Proven Member

    359
    34
    Joined Apr 22, 2011
    Mount Vernon, Iowa
    I have an HX40 with a billet comp wheel and the .55 BEP housing.

    This is the porting I did on mine and I have trouble keeping boost stable over 34psi
    I would do this, and then little more.

    In a perfect world you'd want to get the hole to as close to the size of the wastage gate valve as possible. (this is not going to happen for us with BEP housings) but you can get damn close.

    I can only speak to my experiences, and I guarantee if you don't port yours out at all you will have trouble controlling boost from the get go with this housing.

    [EDIT]

    keeping it under 7K is not going to magically enable you to control your boost. It will spike at peak VE in your power band (or where ever max boost should hit for your setup) and continue to build boost after that point if you do not have adequate space to move the gases.

    18527738_10210809352968133_1350032063648268178_n.jpg
     
    Last edited: May 18, 2017
    My DSM:
    Loading...
  19. Vegas smith

    Vegas smith Proven Member

    1,427
    517
    Joined Dec 2, 2002
    Houston, Texas
    So you had to move the car 20ft but instead went out pulled a couple car lengths on a turboed Busa? You have a boost problem :)
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    16g   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
    Loading...
  20. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    Yeah, for the life of me, I can't get over "Boost Withdrawl's"!!!!
    Gotta have my fix, man!!! (at least it was a good excuse to go for a "spin") :p
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
  21. ceedawg

    ceedawg Supporting Member

    1,289
    201
    Joined Jun 2, 2004
    laurelton, New York


    Keeping it under 7k won't keep it from boosting! Get the .70 housing don't waste your time by impatience time is money!!!
    Don't say we didn't tell ya! You'll be buying another turbo to replace the broken shaft or broken exhaust wheel in that turbo in no time. Then it's gonna cost you a turbo and a new .70 turbine housing. More than twice what you would have spent. Do it wrong ya do it long.
     
    Last edited: May 18, 2017
    My DSM:
    Loading...
  22. 1990TSIAWDTALON

    1990TSIAWDTALON Proven Member

    2,516
    671
    Joined Nov 14, 2013
    Independence, Kansas
    You know, of all things, I didn't have surge. I had a bit of fluctuatuon but when it hit, it hit hard. It varied up top around 30+.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Street Build

    14b   automatic
    1990 Eagle Talon TSi AWD

    13.620 @ 108.460 MPH
    1990 Eagle Talon TSi AWD

    13.612 @ 107.760 MPH
    Loading...
    iugrad92turbo likes this.
  23. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Thanks for all the help fellas. The "keep it under 7,000" statement shouldda been followed by a /scarc tag
     
  24. szutavern

    szutavern Proven Member

    16
    0
    Joined Apr 5, 2005
    Lincoln, Nebraska
    Well I'm not going to be running the BEP housing anymore any recommendations to exhaust housings? goal i 700-900area
     
  25. red_devil

    red_devil Proven Member

    914
    24
    Joined Jul 13, 2005
    Cape Coral, Florida
    My hx40 recently failed and I couldn't figure out why. It was never pushed too hard never over 25psi or 42lb/min. Lasted 5 years before it failed though. I run a turbo blanket and header wraped o2. Wonder if it was the heat that caused it. *sigh* guess it's time to switch.
     
    My DSM:
    Loading...

Share This Page

Loading...


Log in/Register to remove ads

Support Vendors who Support the DSM Community
Ace Race Parts Advanced Fuel Injection Archer Fabrication Boostin Performance ECM Tuning Extreme Turbo Systems ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions Jackson Auto Machine JNZ Tuning Magnus Motorsports Miller Import Parts Morrison Fabrication & Design OHM Racing Race Components Inc RockAuto RoadSurge Spultronix Performance STM Tuned Strictly Import Motorsports VR Speed Factory