1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Trouble Logging In or Staying Logged In?

    CLEAR YOUR BROWSER COOKIES! More info about this can be found here. If you still have trouble after clearing your browser's cookies and cache, reply to that thread and tell us what browser you're using and what device you're using.

1G SpeedDensity BOV help!

Posted by BoostedS256, Oct 12, 2018

Please Support VR Speed Factory
  1. BoostedS256

    BoostedS256 Probationary Member

    24
    1
    Joined Oct 11, 2018
    Olympia, Washington
    Okay so did some searching and found most people recommend the IAT 3-6 inches before the TB but then other people saying it doesn’t matter that much. The cars idle will drop low occasionally and act like it wants to die and leans out on the wideband like there’s a vacuume leak but there isn’t one anywhere, also don’t make fun of me but is my bov half recirculating and half atmosphere cause it has the hole going back into the intake and the hole going out into the atmosphere so confused on that.

    So question is would moving the IAT post bov closer to the TB be worth the effort and possibly help my idle or is it not that big of deal?
    Second question what’s the situation with my BOV? Hope to hear some anwsers thank you!
     

    Log in/Register to remove ads

    Attached Files:

    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
    Loading...

    Featured Products from our Supporting Vendors

  2. amsrn13

    amsrn13 Proven Member

    1,864
    446
    Joined Dec 1, 2013
    danbury, Connecticut
    The iat sensor has little if anything to do with your idle. Yes The Iat sensor should be closer to the tb. No your bov isnt half and half. Its either designed to recirc or not. As far as your idle, Id look at your tune. For one make sure your front o2 sensor is functioning properly ie make sure
    The voltage is cyling. If your using the wideband to simulate the narrow band signal make sure its set up properly. Before all of this double check base timing, fuel pressure and iac position.
     
    My DSM:
    1992 Eagle Talon TSi

    Street Build

    645 whp   498 lb/ft
    Loading...
    1990TSIAWDTALON likes this.
  3. BoostedS256

    BoostedS256 Probationary Member

    24
    1
    Joined Oct 11, 2018
    Olympia, Washington
    So it’s a big enough deal that I should move it closer your saying? Since I’m running speed density does that mean I should delete that hose on my bov and plug both ends?
    O2 is functioning properly and fuel pressure is good so guess I’ll search how to check timing and iac position.
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
    Loading...
  4. Vegas smith

    Vegas smith Proven Member

    2,126
    926
    Joined Dec 2, 2002
    Houston, Texas
    I'm not sure how that BOV works, but most BOVs will have one exit that shoots air into the intake or to the atmosphere. Yours has both. I'd look up the manufacturer directions on that. If it's setup improperly then that could be your problem. I doubt the change in IAT position will affect anything. People recommend to put it as close to the tb as possible because (I'm assuming) it will give the most accurate indication of what the intake manifold temp will be. Maybe if you redo your piping one day then change it. If not, don't worry for now. Most idle drops are do to an improperly adjusted isc/biss screw.
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
    Loading...
  5. Vegas smith

    Vegas smith Proven Member

    2,126
    926
    Joined Dec 2, 2002
    Houston, Texas
    If you're running speed density, the BOV has setup has considerably less affect on how the car runs. I wouldn't bother messing with the BOV in that case. The setup tends to have a bigger effect when you're running a maf sensor.
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
    Loading...
  6. BoostedS256

    BoostedS256 Probationary Member

    24
    1
    Joined Oct 11, 2018
    Olympia, Washington
    Yeah that’s what was throwing me off I’ve never seen a bov like that but yeah I’ll look it up and see what the deal with that is, also just noticed the idle switch doesn’t have a wire anywhere to hook up to it at all could that be the culprit or does dsm link run without that?
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
    Loading...
  7. BoostedS256

    BoostedS256 Probationary Member

    24
    1
    Joined Oct 11, 2018
    Olympia, Washington
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
    Loading...
  8. Vegas smith

    Vegas smith Proven Member

    2,126
    926
    Joined Dec 2, 2002
    Houston, Texas
    The idle switch can be simulated if you are running ecmlink. If not, you need to hook it up asap and adjust it per spec. Also, ISC and BISS absolutely effect idle. The ISC/BISS are almost the sole way to get the idle dialed in.
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
    Loading...
  9. BoostedS256

    BoostedS256 Probationary Member

    24
    1
    Joined Oct 11, 2018
    Olympia, Washington

    Okay really need to get my laptop fixed so I can get into ecmlink and see what all is going, and alright I guess that post I read he must have been mistaken or something I’ll check on both of those, timing,iac and the tune itself and go from there
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
    Loading...
  10. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    3,141
    995
    Joined Nov 14, 2013
    Independence, Kansas
    Get the laptop logging and go into the idle box on the SD VE table and richen up the mixture in that box and some of the surrounding boxes. You can't really goof it up. I take a picture of it and if it gets weird, I put my values back to where they were. My recent swap to SD on my daily had me dialing in that specific thing to keep it from leaning out and dying. I also played with my deadtime a little bit but was only dialing in stock 390 injectors. Once I got the idle mix richened up, my car starts up first crank now.....and I am about to swap in 1120s so I'll be doing it all again real soon. It's more of a game and fun for me than anything serious but it gets the job done. If you have V3 link you can go for a 20 min cruise and then do a SDADJust by right clicking in the log and going to the ve table and see what it is recommending and apply those values. It has worked real good for me.
    And I have my IAT sensor about 6" from my TB on the daily but it is just after the BOV on my profile car. Doesn't seem to matter. My O2. :)
    Marty
     
    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...
  11. Vegas smith

    Vegas smith Proven Member

    2,126
    926
    Joined Dec 2, 2002
    Houston, Texas
    What about your o2 sensor?
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
    Loading...
  12. Dsm panda

    Dsm panda Proven Member

    148
    34
    Joined Dec 8, 2017
    Franklin, Wisconsin
    Iv seen the "dual port" Bov before the ones worth alot of money allow you to choose how much dumps to atmosphere and the cheap knock offs just are open on both sides I suggest ditching that bov and get a diferant one.
     
    My DSM:
    1991 Eagle Talon TSi

    327 whp   307 lb/ft
    1990 Plymouth Laser RS Turbo

    Street Build

      manual
    Loading...
  13. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    3,141
    995
    Joined Nov 14, 2013
    Independence, Kansas
    She's all up and down......: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...

Share This Page

Loading...


Log in/Register to remove this ad

Support Vendors who Support the DSM Community
Ace Race Parts Archer Fabrication Best Used Tires Boostin Performance ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Miller Import Parts Morrison Fabrications OHM Racing RockAuto SouthBay Fuel Injectors STM Tuned Tire Rack VR Speed Factory White Shed Speed