tuning for MPG

Posted by 95weclipse, Nov 4, 2012
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.

  1. 95weclipse

    95weclipse Proven Member

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    LaSalle, Illinois
    I need help with getting my car tuned, my mods are on my profile, I just need to get this tuned, my car only gets 20-21, ran a compression test the other day came back all above 170, think my pcv is stuck open, will be getting a new one soon, I don't need a 10 sec tune, just to get the "base tune" done i guess any help would be greatly appreciated, I am using ecmlink v3 lite btw
    #1
  2. bastarddsm

    bastarddsm Supporting Member

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    Mendota, Illinois
    That's about all the better it's gonna do unless your on the highway nonstop and never ever touch boost.

    These cars don't really get good mileage unless your really really light footed.
    #2
  3. RvlutionMtrsprt

    RvlutionMtrsprt Proven Member

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    Eugene, Oregon
    Tune your idle and cruise AFR's into the low 16's. That should help you out on the mpg a little bit. I got over 25mpg on my last road trip in the GVR4 and that was on e85.
    #3
  4. 95weclipse

    95weclipse Proven Member

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    LaSalle, Illinois
    I get that completely babying it, little to no boost I cant get 300 miles out of a tank of gas, and if I get 300, I don't know how big the tanks are, I am guessing 15? cause when my gas light comes on and I fill it, it only takes 14 so I figure its 15 so that's only 20 and I am on the high way most of the time, Bastard, you know I39, I live in Oglesby now and I work in Wenona, so I hop on 39 and take it to Wenona and get off at 18 and my work is only 1 mile done the road so I am only off the high way for 3 miles the rest is about 15 miles so I drive about 36 miles a day mon-fri, depending on if I got to pick my daughter up which I go to streator to do but still I am running 60mph and I for got where my rpms are at 60 but at 70 they are at 28-2900 so I have to baby the s**t out of it to make 300, my gst was getting 23-34 before link, injectors, ect.... then after all that it was still getting 350 miles to a tank easy
    #4
  5. DSM1G90

    DSM1G90 Supporting Member

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    Nampa, Idaho
    Around town, I do 20 to 22, mixed freeway and town 25 and straight freeway for a full tank, about 28 mpg with cruise on.

    I run my stock 16inch tires at 35lbs and that helps reduce rolling resistance.

    Your numbers are close to normal for a 3000LB beast what the 2G vehicles almost weighs in.

    Plus, you have a driveshaft running the back wheels and that eats up fuel pretty good as well since one motor is driving four wheels. If you were a GS NT with the 420A motor, then you might gain a couple of miles due to being FWD.

    300 miles a tank is also about norm for city/hgy driving with these things.

    And stay away from E-85 .. we don't have the protection to use that corrosive fuel along it will kill your MPG in a heartbeat. E-85 is made for the new cars that are 'flex fuel' qualified.

    Lose about a half ton and then you might get some higher numbers...or, get a Honda for they have smaller motors, lighter chassis and sip fuel as a Honda are known for.

    -DSM
    #5
  6. AlphaVision

    AlphaVision Proven Member

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    Sofia, Europe
    I think the setup has lots to do with it. I have driven my car on the highway once and tuning the AFR's to 15-16s would start overheating process so I lowered those numbers to get decent 85-90 degree Celsius.

    Next time I will try to retard timing as well so I can cut little more fuel so the mpg is more and heating is less...
    #6
  7. DSM1G90

    DSM1G90 Supporting Member

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    Nampa, Idaho
    Retard timing and your MPG goes to the sewer since you're killing the efficency of what correct timing is designed for.

    If you got heating issues, look more into the A/F setup to get that balanced - from a lean issue to a more balanced issue.

    Sorry, you just can't have mega performance and great gas mileage at the same time.

    It takes fuel for performance, but if economy is what you want, either pull the motor out and put in a 1.8L, or get a smaller car that does give you the economy.

    Just the nature of the game.
    #7
  8. Bud92gsx

    Bud92gsx Supporting Member

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    Your moms house, Wisconsin
    You should ask Paul what he can get;)
    #8
  9. RvlutionMtrsprt

    RvlutionMtrsprt Proven Member

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    Eugene, Oregon

    Yea, e85 is terrible. It allowed me to make over 550whp and get 25mpg on the freeway. Guess I better go back to 92 octane since my car isn't "flex fuel qualified".
    #9
  10. DSM1G90

    DSM1G90 Supporting Member

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    Nampa, Idaho
    E85 has the octane - well over 105 octane to get such power, but that ethanol content is so damned corrosive and destructive to rubber and other materials.
    #10
  11. ZombieSix

    ZombieSix Proven Member

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    Virginia Beach, Virginia
    Wtf is this guy talking about "stay away from e85"

    !?!?
    Its not acid it won't melt a whole through your gas tank. And those of us that do run it (i plan to in spring) have proper supporting mods. U don't just go to the pump n fill it up with e85 and drice off on your merry way it requires specific tuning and op doesn't even have a safc to tune with yet your warning him to stay away from it. Nonsense.


    As for mpg, sorry op I think 20 is good I'm lucky if I get 17 or 18. Alright I don't know how some of you guys can Daily a dsm you definitely need a daily driver to own a DSM. My slobalt gets about 36mpg. Has absolutely no power. But it gets me to work and back for less then half of what the gsx would cost me
    #11
  12. AlaskanDsm

    AlaskanDsm Proven Member

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    Phoenix, Arizona
    He has ECMLink V3 Lite... Which is much better than a SAFC (IMO).... Just saying. It is the last sentence of the OP's Post.

    However, you both have valid points. E-85 is not supposed to be used in the stock fuel system of the DSM. But if you replaced certian fuel components, you will be able to run E-85 successfully without any issues other than a tune of course.
    #12
  13. briank

    briank Proven Member

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    dallas, Texas
    I have had good results with tire pressures at 60 psi.
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  14. AlaskanDsm

    AlaskanDsm Proven Member

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    Phoenix, Arizona
    What tires and rims are you running on at 60PSI?
    #14
  15. eclipsechris

    eclipsechris Proven Member

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    fayetteville, Tennessee
    with highway miles, i got 385 and my gas light didnt even come on yet.
    of course i only boosted like 2 times.

    tire pressure is like 35 psi i believe for me
    #15
  16. Macspsi

    Macspsi Proven Member

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    i was talking to one guy at the shootout and he said he's close to 40mpg he uses ecmlink to tune with.
    #16
  17. RedGST98

    RedGST98 Proven Member

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    las cruces, New_Mexico
    40 with ecm link on a turbo motor?
    #17
  18. DSM1G90

    DSM1G90 Supporting Member

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    Nampa, Idaho
    60psi .. must be wagon wheels... He hits a bump and the suspension is really taking the hit.
    #18
  19. MJcanada

    MJcanada Proven Member

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    campabello, South_Carolina
    Turbo doesn't hurt mpg and in ways in can help.
    #19
  20. 95weclipse

    95weclipse Proven Member

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    LaSalle, Illinois
    still my main question stands I guess, how do I go about tuning it, Ive tried reading about it on here but it don't really make sense to me, just looking for some one to walk me through tuning it
    #20
  21. AlaskanDsm

    AlaskanDsm Proven Member

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    Phoenix, Arizona
    Start reading!
    start [ECMTuning - wiki]

    Videos:
    ECMTuning, Inc.

    You can also post logs in the Tuning and Engine Management section of the site for more help with your tune.
    #21
  22. bcjjones

    bcjjones Proven Member

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    Austin, Texas
    You could always set your 2 step to 3500 rpms and then unhook your speedo cable ;)
    #22
  23. ncdirtrider249

    ncdirtrider249 Proven Member

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    I just leaned out my SAFC, and got about 320/tank, roughly 29 MPG. But, I shifted at like 2k, and didn't leave vacuum.
    #23
  24. MJcanada

    MJcanada Proven Member

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    campabello, South_Carolina
    I get better without tuning.
    #24
  25. dsm-man

    dsm-man Proven Member

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    colorado spring, Colorado
    E85 wont instantly destroy your fuel system. I have my 2g gsx on e85 completly stock except for a walbro 255 and 1250cc injectors tuned on v3 for over a year with no issues. For mpgs i do not recomend it. But i dont want people thinking e85 is bad i love the power increase from 93 octane
    #25

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