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Tuning 98 GST

Posted by Mitsubishiown, Feb 11, 2012

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  1. Mitsubishiown

    Mitsubishiown Proven Member

    145
    15
    Joined Feb 11, 2012
    Davison, Michigan
    I just recently purchased a 98' Eclipse GST and I am not sure how great of a tune is on it right now so I figured I would learn about tuning and do it myself. The guy told me it has a flashable ECU, which a lot of people call an "EPROM" from what I have noticed, well I think I am still learning. And he says that there is an EPROM chip inside the ECU that is being used as the tune. So I am confused as to how this works. If I want to retune it what do I need to do and how do I do it? From what I have gathered I can get a Tactrix Cable 2.0 open port, ecuflash, and evoscan. Then tune it that way. But what do I do with this EPROM chip or whatever, is that what I put all the changes onto from my tune then I put the chip back into the ECU? Sorry I am new to this and I have done a lot of reading I just need some help.
     

    Drag Race Build 620  1

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  2. WES_393

    WES_393 DSM Wiseman

    3,125
    59
    Joined Jun 6, 2011
    Colo Spgs, Colorado
    If you have a 98 you have a "flashable" ECU that can be edited with the system you are talking about without physical changes to the ECU itself. I'm not faliliar with Evo Scan or flashing 98-99 ECU's so hopefully someone else chimes in.

    However, EPROM is a different story. EPROM stand for Electronically Programmable Read-Only Memory. In order to tune an EPROM ECU, usually a chip must be installed in place of the factory EPROM chip. There are two kinds of chips that you can put in. One is a chip that you must program before putting into the ECU. This is a "burned" chip and must be removed to change the tune of the car. It's old school to say the least. The second and most common is a chip that lets you edit the ECU using software on your computer, usually a program called DSMLink made by ECM Tuning.

    If you have an EPROM ECU in your car, someone swapped your ECU with one from an early '95. To find out you have to pull out the ECU (which is super easy), and then remove the top case to look for the EPROM chip. If your ECU is in a black plastic case, you have a flashable ECU.

    How to determine if you have EPROM:
    socketid [ECMTuning - wiki]
     
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  3. Mitsubishiown

    Mitsubishiown Proven Member

    145
    15
    Joined Feb 11, 2012
    Davison, Michigan
    Thanks so much for that post man! That had a ton of information in it that I needed. Actually from what I just read from one of his texts is that it has an EPROM ECU in it. So what would be the easiest/most cost effective way to tune it? I know DSMLink is the best but I think it is kind of unnecessary for what we are looking to do. The standard evoscan would be the best option for us if that is still possible.
     

    Drag Race Build 620  1

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  4. Melbowski

    Melbowski Proven Member

    90
    9
    Joined Mar 23, 2008
    Reese, Michigan
    Welcome to the board! First thing's first; you need to find out what type of ECU is in the car. Seeing as it's a '98 it should have a flashable ECU (not typically called EPROM), but before flashing became a reality a few years back it was common to swap the '95 EPROM ECU into the car for tuning. The '95 ECU is an EPROM that requires DSMlink, it is not the same as a flashable '98/'99 ECU.

    You can confirm what you have by looking at the ECU. It's located under the center console, just pop the kick-panel off to see it. The flashable ECU's are a black plastic case, older units are metal/somewhat brass-colored unit.

    Seeing as the previous owner said it was "flashable" I'll assume it's a '98/'99 ECU. To work with the flashable units you'll require the Openport 2.0 cable, the Mitsubishi flash adaptor, a laptop, EvoScan (datalogger), and ECUflash (flashing utility).

    The flashable ECU holds a ROM file that you can download via ECUflash. The file is editable via ECUflash to adjust the tune outside of the car at your leisure (Timing/Fuel). After configuring the tune, you then reconnect to the car and flash the new ROM into the ECU to have all your changes take effect. The flashing process is simple, the tuning process is grueling...

    The first step in learning to tune is to read about tuning, the second step is to continue reading, followed shortly by even more reading. Only once you feel 110% comfortable from swelling your brain with information should you even attempt to begin tuning. There are plenty of resources to learn from, though most are from the Evo world. The Evo ECU is very similar to our flashable units, but are not exactly the same. The general idea on how to tune remains the same, so all Evo sources are at least mostly useful; be sure to read/watch all of them.

    First and foremost you need Ceddymods; your car should already be using it if its been flashed. The safety features of CEL flash on knock, and stock Boost Gauge showing knock count alone make it a must-have. You can read about it here: Ceddymods and download it here: Ceddy's Store.

    Next watch the first video of this set on Evom: ECUflash Training Videos. The first video will give you a good general idea of how flashing works to begin with. The rest of the videos will go too in-depth for your skill level at this point, so return to them later.

    Now that you know the basics of how the ECU flashing process works move on to our forums on how to use Ceddymods, and the flashable ECU in general via these threads: http://www.dsmtuners.com/forums/tuning-engine-management/338754-first-flashed-dsm-ecu-98-99-flashing-faq.html and http://www.dsmtuners.com/forums/tuning-engine-management/347070-ceddymod-v1-ecuflash.html

    Ceddy's website is packed with information on general tuning, from setting injector scaling, to fine-tuning the MAF. Read everything you can from here: Ceddy US

    To finally get in-depth and learn the basics to actually begin tuning head back to the Evo forums and read every word of: How To Tune an Evo - evolutionm.net. The part about variable valve timing and such does not apply to us, and they use minorly different injector scaling, ignore those parts and use Ceddy's guides instead.

    Now return to the Evo Training Videos and watch them all. Some of it will still be over your head, but you should know enough by now to actually begin some tuning.

    That should be enough to get you started. the members here can help if you have any questions, and the Evo crowd still has some respect for their DSM ancestors and are often willing to help. Never be afraid to ask any questions, and do not mess with anything you do not understand. Your engine is not fragile, but it will not stand up to unending abuse from a bad tune. Be conservative with your tuning, and always ask for help if you're unsure; that's what this community was built for!

    Should you in turn have a '95 EPROM ECU, all of the above is not overly useful. The '95 ECU requires DSMlink, (or ECMlink, whatever they're calling themselves these days, LOL). They have their own forum and FAQS to get you started after you purchase their software/hardware package. All of their information can be found here: ECMTuning, Inc. as well as their forums. As is typical, be ready to read until your eyes bleed, it's the only way to start out and learn the basics.

    Good luck with your car, it holds a lot of potential! I hope some of this helps you out, happy tuning! :thumb:
     
  5. Mitsubishiown

    Mitsubishiown Proven Member

    145
    15
    Joined Feb 11, 2012
    Davison, Michigan
    Thanks a ton for the help guys!! I haven't had a chance to look at it myself yet because I have pneumonia and its freezing out. But the previous owner told me it is a black box that when opened up has a socketed chip in it. So does this mean it is the stock ecu? I am thoroughly confused!
     

    Drag Race Build 620  1

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  6. dsm-man

    dsm-man Proven Member

    37
    0
    Joined Dec 27, 2010
    colorado spring, Colorado
    Remove your driver side center console panel. Disconnect your battery remove the ecu there a few phillips screw driver bolts that hold it in the ecu unplug it and open the ecu then post pics it will save alot of time. We dont want to guess what you have and give you the wrong info
     
  7. FLASH1970

    FLASH1970 Proven Member

    880
    7
    Joined Aug 22, 2005
    Lake Geneva, Wisconsin
    A black box would lead me to believe it is a flashable ECU... NOT an EPROM. Just search for "Ceddymods" and you'll find a lot of info on flashable ECU's.
     
    FLASH1970

    1K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM
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  8. 98spyderboost

    98spyderboost Proven Member

    256
    0
    Joined Aug 2, 2004
    Mount Juliet, Tennessee
    It has to be a flashable ECU. It's likely the guy simply doesn't know the difference. 98's come with a flashable (the black box) ecu from the factory. I haven't seen too many change overs on 98's or 99's to an eprom ecu since Ceddy cracked the black boxes years ago. My 97 has a 98 ECU in it and I use Evoscan to datalog and ECU flash with Ceddy mods for tuning. Works well. Reliant on community support though.
     

    344  0

    1998 Mitsubishi Eclipse Spyder GST
    manual · 2G DSM
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  9. 4yoto24

    4yoto24 Proven Member

    58
    0
    Joined Jun 11, 2009
    Bakersfield, California
    good info guys thanks
     

    319  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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