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  1. #1
    Veteran Member Three Rings mike's machine's Avatar
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    Does Water/Methanol Injection Improve Fuel Efficiency?

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    A lot of write-ups on how it improves performance-wise, but I was wondering if it helps to get better fuel efficiency.
    I notice ones designed for better fuel efficiency does not spray water/methanol, and it's just on all the time, but ones designed for better performance sprays with a pump, and turned on at certain psi and sprays different rate at different psi...
    I'm looking for one improves fuel econimics and improves performance...
    can I just get ones with spray pump and set the psi low?
    will it work?
    C5, Giac, 2Bennet , UUC, snub, 034, piggies, RS6 SE catback, rear S4 BBK, RNS-E, JHM, darintakes, K&N, forge, samco, rs6 reps, OZ Ultraleggera, phat box, 4.2 blades, clear corners, LED tails, tinted - SOLD

    Rolling on AR 402, H-sports, Milltek Turboback, O.CT tune, LWFW w/RS4, Stoptech ST-40 332mm fitted in stock 17", hyperboost BPV, Quad-xenon

  2. #2
    Veteran Member Three Rings chrisbostonusmc's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    did you get the springs okay?
    Stage 3 SSP Tuned RS4 K04'd
    12.4 @ 115 on pump gas only
    425AWHP/467AWTQ
    ALL MY MODS DONT FIT IN SIG! DAMMNITTT!

    95 Toyota Supra T51R 800hp

  3. #3
    Veteran Member Three Rings mike's machine's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Chris,!
    Yes, I put them on and they feel a lot more like I wanted!
    (rear dampings could be a little slower though...lol too much work to make such a little adjustment...so I'll keep it as it...)
    and they gives pretty good drops on my 2Bennets!
    C5, Giac, 2Bennet , UUC, snub, 034, piggies, RS6 SE catback, rear S4 BBK, RNS-E, JHM, darintakes, K&N, forge, samco, rs6 reps, OZ Ultraleggera, phat box, 4.2 blades, clear corners, LED tails, tinted - SOLD

    Rolling on AR 402, H-sports, Milltek Turboback, O.CT tune, LWFW w/RS4, Stoptech ST-40 332mm fitted in stock 17", hyperboost BPV, Quad-xenon

  4. #4
    Veteran Member Three Rings chrisbostonusmc's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    awesome!
    Stage 3 SSP Tuned RS4 K04'd
    12.4 @ 115 on pump gas only
    425AWHP/467AWTQ
    ALL MY MODS DONT FIT IN SIG! DAMMNITTT!

    95 Toyota Supra T51R 800hp

  5. #5
    Veteran Member Four Rings pit viper's Avatar
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    2000 A6 2.7
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    Phoenix, AZ

    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    No, water/methanol won't improve your fuel efficiency.

  6. #6
    Veteran Member Four Rings 2.slowT's Avatar
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    2002 Audi A6 2.7T
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    Minneapolis MN

    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Quote Originally Posted by pit viper View Post
    No, water/methanol won't improve your fuel efficiency.

    Are you talking out your butt? Of course it gives you better gass milage. ALOT!
    2002 A6 2.7T Sport
    2000 A4 Avant Daily


    C5UNION | pictures & timeline

  7. #7
    Senior Member Two Rings
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    I have noticed no improved fuel efficiency; but I did use that "possibility" to justify the purchase. I guess it could improve your efficiency if you are replacing fuel with it; but usually it is set to come on in boost so it will depend on your driving style. Remember that you will also have to pay for methanol.

  8. #8
    Senior Member Three Rings 02alltoad's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Quote Originally Posted by 2.slowT View Post
    Are you talking out your butt? Of course it gives you better gass milage. ALOT!
    how? its injected after the maf so its not mesured. the engine is still getting the same amount of fuel. now if your intake was dirty with alot of carbon build up and you added meth the meth would act as a very good intake cleaner and after a while you would get better flow and make you think your getting better milage, but if you put it on a clean motor there would be no noticable gains in fuel economy plus depending on what system you have and when you have it set to come on your not looking for economy anyway.

  9. #9
    Senior Member Three Rings 02alltoad's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Quote Originally Posted by rageman2 View Post
    I have noticed no improved fuel efficiency; but I did use that "possibility" to justify the purchase. I guess it could improve your efficiency if you are replacing fuel with it; but usually it is set to come on in boost so it will depend on your driving style. Remember that you will also have to pay for methanol.
    lol you beat me to it .

  10. #10
    Veteran Member Four Rings pit viper's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Quote Originally Posted by 2.slowT View Post
    Are you talking out your butt? Of course it gives you better gass milage. ALOT!
    I've run water/meth injection for the past 5 years. Does it allow me to run more boost, or more timing? Definately. And thus makes more power.
    Most kits only come on under boost, however, and will have no effect on your fuel economy.

    Oh, it also does a marvelous job of cleaning your combustion chamers.

  11. #11
    Veteran Member Four Rings 2.slowT's Avatar
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    2002 Audi A6 2.7T
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    Minneapolis MN

    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Do you use the Snow System?
    2002 A6 2.7T Sport
    2000 A4 Avant Daily


    C5UNION | pictures & timeline

  12. #12
    Veteran Member Four Rings pit viper's Avatar
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    2000 A6 2.7
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    Phoenix, AZ

    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    No sir, although I had one of their controllers for a while.
    I've used Coolingmist, Devil's Own, and currently run an Aquamist HFS-5 system.

  13. #13
    Senior Member Two Rings
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    I run a Snow Performance system - you can check it out at the next MNAudi gtg if you're interested.

  14. #14
    Veteran Member Three Rings mike's machine's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Mine's chipped with Giac, how much boost does it produce?
    If you set the initiate point as lowest boost as possible, wouldn't it some what help for daily driving...? or not...
    And I'm seriously wondering how much boost my car makes...
    C5, Giac, 2Bennet , UUC, snub, 034, piggies, RS6 SE catback, rear S4 BBK, RNS-E, JHM, darintakes, K&N, forge, samco, rs6 reps, OZ Ultraleggera, phat box, 4.2 blades, clear corners, LED tails, tinted - SOLD

    Rolling on AR 402, H-sports, Milltek Turboback, O.CT tune, LWFW w/RS4, Stoptech ST-40 332mm fitted in stock 17", hyperboost BPV, Quad-xenon

  15. #15
    Veteran Member Four Rings pit viper's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    You're not really gaining anything at low (1-5ish) pounds of boost, as you're probably less than 75% throttle and still on open-loop tuning. Water injection was never meant to improve fuel efficiency, although I suppose it could at WOT if you don't add timing or boost, but use the additional cooling provided to offset fuel you could remove.
    But we're talking negligable at best.

  16. #16
    Veteran Member Three Rings mike's machine's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    So how do you tune the engine?
    Do you have to run it on Dyno and stuff?
    It's not something you can do @home, right?
    C5, Giac, 2Bennet , UUC, snub, 034, piggies, RS6 SE catback, rear S4 BBK, RNS-E, JHM, darintakes, K&N, forge, samco, rs6 reps, OZ Ultraleggera, phat box, 4.2 blades, clear corners, LED tails, tinted - SOLD

    Rolling on AR 402, H-sports, Milltek Turboback, O.CT tune, LWFW w/RS4, Stoptech ST-40 332mm fitted in stock 17", hyperboost BPV, Quad-xenon

  17. #17
    Veteran Member Four Rings pit viper's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Well, that depends. If you have a way to adjust fueling, and a way to track a/f ratios and timing, then sure you can tune it at home.

    On my SRT, I usually fine-tuned my system on the road.

  18. #18
    Veteran Member Four Rings TweetsS4Estate's Avatar
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    Re: Does Water/Methanol Injection Improve Fuel Efficiency?

    Quote Originally Posted by pit viper View Post
    I've run water/meth injection for the past 5 years. Does it allow me to run more boost, or more timing? Definately. And thus makes more power.
    Most kits only come on under boost, however, and will have no effect on your fuel economy.

    Oh, it also does a marvelous job of cleaning your combustion chamers.

    I agree, but one could argue that because of the temp drop one could tune the car to a leaner setting and higher boost so that the car was relying on the turbo more, thus creating a more fuel efficient set up. The only problem is you wouldn't want to run the car hard, and you wouldn't make the most power possible.
    Also I agree because a bottle of heat costs anywhere from 1.00 a bottle to 2.40 a bottle. Everytime you fill up you use 4-5 bottles and if you like going fast thats almost every tank fill up. I don't want to sound like a broken record but if you're thinking about meth do it for performance gains and not MPG gains and you will be happy!



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