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Thread: 100% meth

  1. #1
    Potential Tuner
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    100% meth

    Just looking for some help here. I was messing around with 100% meth and tweaked the tune. When i run 50/50 (meth/water) my air/fuel is between 11.1/11.3 after tweaking and changing it to 100% meth my air/fuel is around 10.3. With my air/fuel at 10.3 i am getting full commended timing and no knock would that be safe to say it's safe running 10.3 air/fuel or should i keep bringing my air/fuel closer to 11s? The car seems to be liking the 10.3 air/fuel ratio. The turbo spools faster and i am making more boost up to 2psi more without messing around with any timing just my fuel enrich table at wot.

    it's a turbo car and making 580/580 @ 10psi with 50/50

    Running 100% meth i am hitting 11.5psi - 12.5psi

  2. #2
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    I'm trying to understand why switching to pure meth would raise boost? As far as fuel, 10.3 would be safer than 11.3 but with blended fuel you should use lambda to as the different stocky of the meth will change things.
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  3. #3
    Tuner DGA's Avatar
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    The cooling effect of methanol would raise boost compared to half water.

    I don't rape PE tables cause I don't know what I am doing anyway....

  4. #4
    Senior Tuner IDRIVEAG8GT's Avatar
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    Quote Originally Posted by DGA View Post
    The cooling effect of methanol would raise boost compared to half water.
    Lolwut. IAT rises, boost increases, ermmmm Manifold Pressure increases.

    My vote goes to higher EGT's and more of it since the 100% meth gives such a clean and big bang in the cylinder, ESPECIALLY if you run additional timing. Water is primarily introduced into meth to prevent its corrosive attributes, and that's about it.

    I say 100% meth with an 11ish AFR is going to get you even more power.
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  5. #5
    Senior Tuner DSteck's Avatar
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    I run my car in the tens on meth because if it fails, I don't want it too lean on pure pump gas. It'll burn the extra fuel. You just don't want to be down in the 9s.

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  6. #6
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    Thanks guys for all the input..

  7. #7
    Tuner DGA's Avatar
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    Yeah I probably had that backwards, but whatever. Just trying to chime in and not just ask desperate questions all the time I guess.

    I don't rape PE tables cause I don't know what I am doing anyway....