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Max safe boost? [Merged 10-6]

Posted by Turbolaser, Sep 1, 2002

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  1. Passnu2

    Passnu2 Proven Member

    41
    0
    Joined Sep 21, 2012
    Chicago, Illinois
    ECMTuning a good tool for a 1gen to have a tuner dial everything in? Or are there better options?

    Car currently has a small 16g MHI turbo.
    Internal Wastetgate
    Generic Manual Boost control
    255 lph fuel pump
    650cc injectors
    fresh rebuild on head
    Side mount I/C with HKS Hard Pipes
    1gen BOV or Forge BOV
    1gen MAF
    I can't make the exhaust out, looks to be 2.5" (intentions to replace with a full 3" set up)

    My plans are to convert to FMIC & 18g turbo. Was looking at the FP TD05H 18g but have more research to do. I'm basing my direction off a 2gen GSX I owned years ago with the Greddy 18g set up. Have missed this car since selling it 12+ years ago.

    Whats an estimate of safe boost off the given info?
     
  2. 2g spyder eclipse

    2g spyder eclipse Proven Member

    177
    1
    Joined Apr 30, 2013
    Milwaukee, Wisconsin
    Hello all, I have a 97 spyder gst. The mods include - evo 16g turbo, 255 walboro fuel pump, front mount intercooler, turbo back magnaflow exhaust and HKS bov (recirced ofcourse!) and that is all the mods I can think of right now. What is the safe amount of boost I can do with a boost controller and aftermarket boost gauge?

    P.S I did search but found no threads with my mods or similar, thanks for the help! :hellyeah:
     
  3. Zufelt

    Zufelt Proven Member

    481
    9
    Joined Oct 15, 2012
    Lemoore, California
    Any injectors? If not I'm sure most will tell you stock boost levels.
     
    Zufelt

    523  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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  4. iugrad92turbo

    iugrad92turbo Supporting Member

    10,546
    437
    Joined May 22, 2007
    Kalamazoo, Michigan
    Grab a wideband, so you can monitor air fuel ratios, depends on your engine too is it healthy.
     

    7K  5

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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  5. Breezio69

    Breezio69 Proven Member

    863
    17
    Joined Mar 5, 2012
    SLC, Utah
    Wastegate pressure... so 10-12 psi... since its a 16g it should be 10 psi.

    You dont want to start upping the boost without at least a wideband, most come as a package to connect to a laptop for between $160-$200. That way you also have a way to log what you are doing.

    But to safely up the boost, get in this order, wideband, way to tune and log, injectors... thats about it and this has been covered 6, 567, 876, 678, 743 times... so im sure you didnt search very hard.

    You can also get the wideband and device/software to tune and play around with the stock injectors A LITTLE BIT, because they run rich from the factory. Then you can get the hang of tuning. Dont go buck wild and think they can handle a bunch of extra boost, just play around and get used to tuning hefore you drop the $$$ on injectors.
     

    Street Build 1K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  6. curt-s

    curt-s Proven Member

    809
    251
    Joined Dec 21, 2008
    Winterville, MB, Canada
    A million.

    There's a TON of variables here, each suits different cars differently. For instance, if your intake temperatures are sky high, that would put you at less maximum PSI overall then if your intake temps were in the 20-25C range.
    Get a tuning solution or, failing that, atleast something to log with so that you can see how the engine is responding and how the ECU is correcting. Then up it (staying within efficiency) until it's no longer safe.

    *Walbro
    Just saying "FMIC" doesn't mean much as each has their different properties.
    As asked, injectors?

    Your mods are actually fairly common and almost defacto for a low-mild modded DSM, sans the brand name exhaust and bypass valve.
     

    Street Build 2K  1

    1991 Eagle Talon TSi
    fwd · manual · 1G DSM
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  7. Crazylilpunk

    Crazylilpunk Proven Member

    30
    0
    Joined Mar 31, 2013
    Philadelphia, Pennsylvania
    Are you using anything to tune with (Dsmlink, Safc, etc)?

    If not, you may want to look into an engine management system before you start cranking the boost up. A good wide band is a good step also.
     
  8. black97spyder

    black97spyder Proven Member

    552
    23
    Joined Oct 13, 2012
    independence, Kansas
    I had a similar setup on my spyder at first, It's not good to do so but u could get away with about 14 psi before any worries... I wouldn't risk more than that. It's not proper to raise up the boost without at least a wideband, like the other guys have stated.
     

    942  3

    1995 Eagle Talon TSi AWD
    11.55 @ 120 · 2G DSM

    1K  19

    1997 Eagle Talon TSi AWD
    12.810 @ 106.530 · 2G DSM
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  9. preludeachris

    preludeachris Proven Member

    271
    1
    Joined Sep 29, 2011
    Lincoln, Nebraska
    I wouldnt be doing anything before I get a wid-band. Pick up some used injectors to THEN start getting boost happy :thumb:
     

    382  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  10. Nathanxavierr

    Nathanxavierr Probationary Member

    15
    0
    Joined Jan 16, 2013
    Fall River, Massachusetts
    Hey Guys! Quick question, well making a long story short,. I just Bought myself a Greddy boost controller and turbo timer. I took the head of a six bolt to the machine shop and built the head of the motor. The boost without the boost controller is at 16psi for some reason, most likely something to do with the wastegate actuator. But my motor takes it like a beast. But anyway i have a walpro 255 fuel pump and i did increase the fuel injector size to 750cc's. The question is can i turn up the boost to like 18 to 20 psi safely and have it still be a daily driven with no need to worry? Thanks for the replies in advance guys.
     

    199  0

    1998 Eagle Talon TSi AWD
    · 2G DSM
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  11. PieEyedPiper

    PieEyedPiper DSM Wiseman

    4,317
    43
    Joined Nov 13, 2004
    North Bay Area, California
    Please fill out your vehicle profile.

    From what I can tell, your car is stock - save for a boost controller, a 6 bolt swap, fuel pump and 750cc injectors. Based on that I'd say you need to start worrying about tuning before upping the boost on what must still be the stock T-25, right?
    You see where I'm going. :)

    Fill out the profile and then you can get some real answers. Though, I'm betting, the most popular response will be something along the lines of "You tell us". You see, we can't really give out that kind of information so readily. Every car is different, so what might work for one car may not work for another. Your best bet is to take some logs and comb through them to decide if your running safely and can safely increase the boost.

    What are you tuning with?
     

    2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  12. 99ECLIPSEGSXDSM

    99ECLIPSEGSXDSM Proven Member

    1,015
    69
    Joined Aug 22, 2010
    Erie, Pennsylvania
    If you can't turn your psi down you need have a wideband in ASAP. Are you running wastegate pressure or still running the stock bcs? You have no idea what your a/f ratios are and could be hurting your motor more then it being a beast.
     

    Autocross Build 663  1

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Autocross Build 4K  0

    1999 Mitsubishi Eclipse GSX
    13.5 @ 99 · 2G DSM
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  13. Nathanxavierr

    Nathanxavierr Probationary Member

    15
    0
    Joined Jan 16, 2013
    Fall River, Massachusetts
    head of the motor is built, better cams, s2 cams. the head is bolted down by ARP head studs, and was built at the machine shop. not to long ago. i have MSD Multi spark ignition system as well. the boost is creeping to 16 psi i dont know why its not vacuum leaks did a test a week ago and there is none. i just ordered a AEM wideband coming in the mail. i just got the boost gauge controller and timer earlier then the wideband. so i'm just asking if its a certain good psi to run by till i get the wideband and tune the car.

    im also running wastegate pressure
     
    Last edited: May 22, 2013

    199  0

    1998 Eagle Talon TSi AWD
    · 2G DSM
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  14. squid267

    squid267 Proven Member

    107
    2
    Joined Jan 14, 2012
    Worcester, Massachusetts
    Hey guys, I'm just finishing up my 6 bolt swap. Doing a boost leak test, which brings to me to a very important question. What am I going to be running for boost. (So i can test that psi)

    Heres what I got

    14b turbo

    Mods
    -PTE/Delphi 780cc Injectors
    -AFPR (not sure what brand, but red anodized unit)
    -Walbro 255 fuel pump
    -stainless steel line to stock fuel rail
    -stock return

    -DSMLink v2

    -stock engine

    -ETS Mitsubishi Eclipse 2G 7" Street Intercooler w/ ETS piping and all
    -Magnaflow catback (not sure of diameter, will check)
    -Ebay Test pipe

    -ACT Streetlite flywheel
    -ACT 2600 Pressure Plate
    -ACT Street Disc Clutch

    -GReddy Profec B-spec II Boost controller
    -GReddy Profec B-spec II Turbo Timer
    -GReddy Type-S BOV

    -Innovate MTX-L Wideband
    -Autometer boost, narrowband gauge.

    i believe thats it. thanks for the help!
     
  15. Abe'sGST

    Abe'sGST Proven Member

    515
    1
    Joined Aug 27, 2011
    Goldsboro, North Carolina
    I'd start off at around 14-15 and work your way up. You need a wideband as well.
     

    632  0

    1995 Mitsubishi Eclipse GST
    · 2G DSM
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  16. squid267

    squid267 Proven Member

    107
    2
    Joined Jan 14, 2012
    Worcester, Massachusetts

    Oops knew i was forgetting something. added Innovate MTX-L to the list.
     
  17. SBstar

    SBstar Proven Member

    2,175
    113
    Joined Jan 1, 2004
    Jackson, Michigan
    All of it! With a good tune you could run pretty good boost even on 93 octane with what you have there. I prefer about 16 on the street though.
     

    5K  7

    1990 Mitsubishi Eclipse GSX
    10.932 @ 123.13 · 1G DSM

    2K  0

    1990 Eagle Talon TSi AWD
    11.146 @ 118.170 · 1G DSM
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  18. LandSpeed-DSM

    LandSpeed-DSM Proven Member

    1,991
    69
    Joined Dec 5, 2011
    Chicago, Illinois
    [​IMG]

    Running 93 + Toluene with Water/Meth injection allowed me to spike boost to the mid 20s and taper to the high teens on my 14B last time it was on the car. This was aided by a massive 30/12/3 intercooler, and high oil pressure (fed from OFH, no balance shafts) with quality synthetic oil (Rotella 5w40)

    Car was a blast.
     

    2K  0

    1992 Mitsubishi Eclipse GST
    · 1G DSM
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  19. Afizzle

    Afizzle Proven Member

    278
    0
    Joined Jan 16, 2013
    Dallas, Texas
    start pushing more than 17-18 lbs and your head studs are gonna start hating you.

    Keep it reasonable until you upgrade to ARP. 100$ and peace of mind up to atleast 25 psi.
     

    644  0

    1998 Mitsubishi Eclipse Spyder GST
    13.414 @ 114.600 · 2G DSM
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  20. Archer Fabrications

    Archer Fabrications Proven Member

    6,186
    957
    Joined May 9, 2011
    Scottsdale, Arizona
    Ive got standard arps and ive ran 30psi. Right now im on 26psi and 50lb a min they hold alot more than just 25psi on a 16g
     

    784  17

    2006 Evo 9 MR
    awd · manual · Lancer Evolution
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  21. mikevar94

    mikevar94 Proven Member

    102
    1
    Joined Apr 25, 2013
    Waterbury, Connecticut
    Sorry if this is a repeated question or something but I haven't found an answer yet. I'm getting a big 16g on my 99 gsx. Everything on the car is stock. Stock injectors, intercooler, ecu...all stock. Anyways, I'd be running the 16g at stock boost as well but from what I've heard, even at stock boost it will create more power. Is this going to damage my engine? I feel like it won't really but I'm not sure. Also it will bolt right up to the stock manifold correct?
     
  22. iugrad92turbo

    iugrad92turbo Supporting Member

    10,546
    437
    Joined May 22, 2007
    Kalamazoo, Michigan
    Yes its a stock turbo, you may need a some new lines though, grab a wideband and possibly a way to tune the car in the near future if you plan on upping the boost, keep it low for now. A 16g is a great turbo depending on what you have now on the 2g.
     

    7K  5

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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  23. Alpha

    Alpha Probationary Member

    27
    0
    Joined Jan 27, 2013
    St. Augustine, Florida
    You can install it without any problems. However, i would keep the boost at wastegate pressure, until you can get a tune.
     
  24. mikevar94

    mikevar94 Proven Member

    102
    1
    Joined Apr 25, 2013
    Waterbury, Connecticut
    Awesome thanks guys.
     
  25. Breezio69

    Breezio69 Proven Member

    863
    17
    Joined Mar 5, 2012
    SLC, Utah
    You'd also want to make sure they went with the stock wastegate setup if its a rebuilt. A member on here got one not knowing it had a 30psi wategate on it :thumb:
     

    Street Build 1K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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