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2G Fuel options?

Posted by John Miller, Jul 2, 2020

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  1. John Miller

    John Miller Proven Member

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    Juneau, Wisconsin
    Hello fellow DSM addicts!

    I have a quick question that I'm sure all of you know (I'm a newbie). I have a 1997 Eclipse GS-T. This is my first car and first DSM that I picked for my first project car. My question is, can I run 91 octane fuel regularly? All gas stations around me sell 87 88 and 91. Only like one station 40 mins away sells 93 octane. Car is completely stock and I know if I plan to upgrade parts then I will have to run 93. Thanks!
     

    284  1

    1997 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  2. Widgmaster

    Widgmaster Supporting VIP

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    Sarnia, ON, Canada
    You should be good with 91.... There is probably no difference between the 91 octane near you than the 93 40 minuets away... Just make sure you always use premium unleaded fuel .
     

    68  1

    1977 Glastron Aqua Lift
    awd · automatic · Misc Vehicles

    110  1

    2002 Dodge Dakota Extended Cab
    rwd · automatic · Misc Vehicles

    288  10

    2001 Mitsubishi Eclipse Spyder GT
    fwd · automatic · Misc Vehicles
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  3. John Miller

    John Miller Proven Member

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    Joined Jan 27, 2020
    Juneau, Wisconsin
    Okay, I noticed on the fuel door it says, "use premium 92 octane fuel at minimum" so that is why I asked.
     

    284  1

    1997 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  4. pauleyman

    pauleyman DSM Wiseman

    5,759
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    oklahoma city, Oklahoma
    92??? I don't ever remember seeing a sticker like that nor any that say 92. You have raised my interest now. Pics please?
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  5. John Miller

    John Miller Proven Member

    154
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    Joined Jan 27, 2020
    Juneau, Wisconsin
    20200702_203321.jpg 20200702_203313.jpg
     

    284  1

    1997 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    1990TSIAWDTALON likes this.
  6. John Miller

    John Miller Proven Member

    154
    56
    Joined Jan 27, 2020
    Juneau, Wisconsin
    Pics have been posted
     

    284  1

    1997 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    Sam's GSX likes this.
  7. Widgmaster

    Widgmaster Supporting VIP

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    Sarnia, ON, Canada
    Well you proved the stickers there but i don`t believe that one octane rating number should matter much.. Remember that different company`s rate there gas differently - while one will say 91 and the other 92 but they probable have the same proprieties Detergents , Cleaning agents Exc ... Next time your there you could ask for there ratings and then compare ..
     

    68  1

    1977 Glastron Aqua Lift
    awd · automatic · Misc Vehicles

    110  1

    2002 Dodge Dakota Extended Cab
    rwd · automatic · Misc Vehicles

    288  10

    2001 Mitsubishi Eclipse Spyder GT
    fwd · automatic · Misc Vehicles
    Loading...
  8. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Cincinnati, Ohio
    No big deal. Hell when the dealership did my gas tank recall, they put in regular. WTH! It was stock form at the time and ran fine. Just lacked power.
     

    405  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    459  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

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    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
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  9. luv2rallye

    luv2rallye DSM Wiseman

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    Minneapolis, Minnesota
    I bought my 99 GST new and it says use premium but there's no minimum octane number posted there. In fact I've been using 88/89 octane for 20 years with no problem at all. I have no mods and only use it for daily driving and TSD rallying however. In the owners manual it says to use 91 minimum but that you can use 87 "however, the performance level may be reduced" although with everything being stock I haven't noticed any difference using 88 or 91.
     

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  10. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma
    I don't think that sticker is oem
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  11. luv2rallye

    luv2rallye DSM Wiseman

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    Minneapolis, Minnesota
    My 1999 GST has the one on the fuel door but not the one saying "Warning Use 92 or higher octane fuel only" anywhere in that area or any sticker mentioning any minimum octane anywhere on the car. I know because I bought the car new and never parted with it since (and no repaint in that fuel door area). So someone most likely added that (maybe even some dealer). And as I said my 1999 owners manual says use 91 octane, not 92 so it's not even factory correct anyway (unless 1997 is somehow different, although they both use the same 2gb engine).
     

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  12. Widgmaster

    Widgmaster Supporting VIP

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    Joined Aug 24, 2018
    Sarnia, ON, Canada
    Do you think the ECM would be able to tell the octane rating ... is there a sensor in there we don`t know about . The reason I ask is I have a fast idle ... I added that 104 octane boost .. Maybe this is why it idle`s fast ???????..
     

    68  1

    1977 Glastron Aqua Lift
    awd · automatic · Misc Vehicles

    110  1

    2002 Dodge Dakota Extended Cab
    rwd · automatic · Misc Vehicles

    288  10

    2001 Mitsubishi Eclipse Spyder GT
    fwd · automatic · Misc Vehicles
    Loading...
  13. pauleyman

    pauleyman DSM Wiseman

    5,759
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    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    Ecu uses feedback from the knock sensor to retard timing. On a stock turbo setup if continues ecu will close the boost solenoid and lower boost. So while it doesn't know what octane you have it can change conditions based on what it detects. No the octane boost will not cause your fast idle
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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    steve and 1990TSIAWDTALON like this.

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