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Max boost on t25 untuned

Posted by Dawson159, Dec 20, 2017

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  1. Dawson159

    Dawson159 Proven Member

    149
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    Joined Nov 13, 2017
    Billings, Montana
    I have a 98 Eclipse gst with a freshly rebuilt t25 turbo in it. I live in billings Montana and there isn’t one professional tuner in the whole city so if I ever want to tune the car I’m going to have to drive somewhere or buy and learn how to use dsm link. I was wondering how much boost I can run without a tune because I read that turning it up makes your car run lean and I don’t want to blow up my car I was thinking 1-2 more pounds or can I not turn it up at all? I’m running 10 pounds of boost rn with a few upgrades the previous owner did and a manual boost controller
    I’m a noob at this so plz be nice:cry:
     
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  2. natedog831

    natedog831 Probationary Member

    19
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    Joined Dec 24, 2016
    Salinas, California
    This topic been covered a lot, I would just search it Lol. Honestly the t25 is so small, you’re probably going to blow it before you blow your motor. Personal I wouldn’t bother with it, you could run it at 14 or 15 psi if you want, people do it, but even then you’re stressing it out.
    Idk what your plans are for your car or if you are new to DSMs, but link is a must. Save yourself some trouble and start saving up for link before you start buying any serious mods
     
    Last edited: Dec 20, 2017
  3. natedog831

    natedog831 Probationary Member

    19
    0
    Joined Dec 24, 2016
    Salinas, California
    Do you have gauges btw, wideband, boost gauge etc .. ??
     
  4. Dawson159

    Dawson159 Proven Member

    149
    16
    Joined Nov 13, 2017
    Billings, Montana
    I have a boost gauge and the car used to have a wideband a/f ratio gauge but it was stolen when the car was broke into when the previous owner had it
     
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  5. Artago

    Artago Proven Member

    1,823
    19
    Joined Nov 30, 2006
    North Vancouver, BC, Canada
    Don't touch the boost until you have a wideband O2 installed.
     

    Street Build 1K  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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    Dstarperformance01 likes this.
  6. EVLGSX

    EVLGSX Proven Member

    486
    208
    Joined Dec 7, 2017
    Wallingford, Connecticut
    You can get away with 14-15 psi but the turbo wont last forever that way. Id just leave it where it is for now, maybe 12 if you cant resist
     

    Street Build 2K  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  7. Derek232

    Derek232 Probationary Member

    29
    1
    Joined Jun 9, 2016
    Thornton, Colorado
    I would strongly suggest getting a good Wideband before messing with anything. AEM has always made the best Widebands in my opinion. They are a small price to pay compared to running a motor lean and having to build a new one.
     
    Derek232

    195  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM

    Street Build 506  5

    1991 Mitsubishi Eclipse GSX
    automatic · 1G DSM
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  8. Aproductions

    Aproductions Proven Member

    1,902
    42
    Joined Aug 11, 2009
    Bethlehem, Pennsylvania
    Leave it at 10-12 and save up for a 16g with supporting mods.
     

    Street Build 1K  1

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Street Build 1K  0

    1999 Mitsubishi Eclipse GST
    manual · 2G DSM
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  9. gusu

    gusu Proven Member

    1,370
    26
    Joined Sep 9, 2009
    Keizer, Oregon
    Don't mess with the boost until you have something to log with. Just because someone else's car was able to do it wont mean your car will be able to.

    Knowing your boost level is great, so is knowing your af/r. But both only part of what you need to know. Normally I would suggest one to you, but I think you can run a generic OBDII cable and an android app. I'm not totally sure for the 2g.
     
  10. Mello

    Mello Proven Member

    1,028
    291
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    I suggest not messing with boost running the T25. Factory boost which is about 12psi is matched to the T25's compressor's efficiency & more boost will push it to higher intake air temps basically cancelling out the increased boost. I would change the BOV before anything with an EVO 9 metal BOV (or 1g) & check for any boost leaks to fix. The T25 is so small that almost anything you do will not make enough difference that the stock ECU couldn't already handle & compensate for. Also, do all your regular maintenance, timing belf, before anything & including new NGK BPR6ES plugs & check the plug wires. And don't space out going through chassis, suspension, & brakes. These cars are pushing 20-25 years old these days.
     
  11. RipperXX

    RipperXX Proven Member

    3,165
    153
    Joined Feb 23, 2003
    Royston, Georgia
    Max boost on t25 untuned?

    Answer:
    :aha:More than stock, less than required to break something.:thumb:
    (1-2 more pounds over stock is fine, and about all you can do before your plastic topped OEM recalculation valve starts leaking anyway)
     

    Street Build 3K  10  9

    1990 Eagle Talon TSi AWD
    13.476 @ 105.48 · 1G DSM
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