Thread: Dumb question about LIM and MPH

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  1. #1 Dumb question about LIM and MPH 
    SE Level Member gotgtp's Avatar
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    Will a bad/leaking LIM have an effect on my fuel mileage? I have a bone stock(performance wise) 04 Comp G. I am currently averaging 16.4 MPG

    2004 Comp G - Bone Stock except visual mods
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  2. #2 Re: Dumb question about LIM and MPH 
    Moderator dsmuts's Avatar
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    A leaking lim will cause a vacuum leak possibly which will hurt gas mileage.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3  
    SE Level Member gotgtp's Avatar
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    Ok that does seem logical. I was kind of hoping that is it. I will be replacing the gasket next weekend. I already put in a new air filter, fuel filter, cleaned the MAF, and TB about two weeks ago and it increased from 15.2 to 16.4 mpg but I think it should be a lot better than that.

    2004 Comp G - Bone Stock except visual mods
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  4. #4 Re: Dumb question about LIM and MPH 
    Moderator dsmuts's Avatar
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    When you do the lim change the spark plugs too.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  5. #5  
    SE Level Member gotgtp's Avatar
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    I'm thinking about going with the NGK plugs and 8mm wires along with MSD coil packs.

    2004 Comp G - Bone Stock except visual mods
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  6. #6  
    I live here. MoarkatsINmuhtrailer's Avatar
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    No, no, no on the coil packs...

    MSD sucks donkey ass.

    Stock coils are way better.

    /end of story
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  7. #7 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Stock replacement plugs are all you need.

    And if you only drive city 16-19 mpgs is pretty normal.

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  8. #8  
    SE Level Member gotgtp's Avatar
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    I was told the MSD would create a better spark but not last as long. And all I do is city driving being from Chicago but I don't get on it too much. Just thought the mpg should be up there at least a little more.

    2004 Comp G - Bone Stock except visual mods
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  9. #9 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Well, we are telling you msd coils suck, so dont use them lol.

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  10. #10  
    LaBarge Supercharged sseilmnop's Avatar
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    MSD coils tend to fail prematurely.
    Adapters, Phenolic Intercoolers, Supercharger Parts & TVS2300
    http://stores.ebay.com/QualitySuperchargers
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  11. #11  
    SE Level Member gotgtp's Avatar
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    I will take your word on the coil packs and go with the OEM. So for the spark plugs I should just go with the AC Delco? And also the wires?

    2004 Comp G - Bone Stock except visual mods
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  12. #12 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Yup ac delco plugs and whatever set of wires you want, most stores have some sort of wires with a warranty.

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  13. #13 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. BillBoost37's Avatar
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    I'd bet yoru issue is too much around town on 3.29 gears and enjoying the power. You aren't going to have a big enough vacuum leak to cause mpg issues
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  14. #14 Re: Dumb question about LIM and MPH 
    SE Level Member gotgtp's Avatar
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    I really do enjoy the power, I don't get on too often but i guess it could be enough to lower my mpg. I think i might have to start buying lighter shoes....
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  15. #15 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. BillBoost37's Avatar
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    I see you live in Chicago. What is your typical driving? When I was there..even though I was on the highway..I was far from cruising at 70+ for extended periods of 20+ minutes. That is a killer for mileage, especially in a 3.29's car.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  16. #16 Re: Dumb question about LIM and MPH 
    SE Level Member gotgtp's Avatar
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    on a side note: will the 8mm wires make any difference (spark/performance wise) if I have the OEM coil packs and plugs in? I don't want to buy them if there is no advantage to that.
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  17. #17 Re: Dumb question about LIM and MPH 
    Turbo is the way to go. BillBoost37's Avatar
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    Thicker wires typically mean more insulation. That's what you usually gain with thicker wires.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  18. #18 Re: Dumb question about LIM and MPH 
    SE Level Member gotgtp's Avatar
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    I do mostly city driving, stop and go every damn intersection, rarely on the highway unless I'm going out of town. I work 15 miles from where i live and usually takes about 35-40 minutes to get there. Needless to say I'm in traffic all the time. That really can't be good the mpg.
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