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This is a discussion on Loosing Pwer within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi guys I am losing power to the car as the fuel gets below the half mark, then it will ...

  1. #1
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    Loosing Pwer

    Hi guys

    I am losing power to the car as the fuel gets below the half mark, then it will have poor performance until i fill up again. Why does this happen?


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    Registered User rr1911's Avatar
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    what r u using to measure this performance loss ?
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    Dont use anything, I can feel it, it just doesnt have that pull away when the fuel is below the half mark, it is like not pushing through enough petrol...

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    Registered User rr1911's Avatar
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    i dont see how this is possible
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    Registered User rr1911's Avatar
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    wrx/sti fuel tank hold "13.5 gallons" of fuel not including the reserve
    1 gallon of water weighs 8 lbs

    13.5 x 8 = 108 lbs @ full tank

    6.75 is half of a tank of gas

    6.75 x 8 = 54lbs @ half tank

    u would be gaining hp by having less fuel
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    Registered User rr1911's Avatar
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    heat soak might be ur problem

    Originally Posted by garin
    can somebody please explain to me what heat soak is? i tried to search for it but found nothing.

    Quote:
    While TMICs' offer a fix to the "turbo lag" caused by the FMIC, they experience an effect known as "heat soak", where the heat from the engine warms the intercooler, lowering its efficiency to cool the intake charge. Due to limited room in the engine bay, TMICs' tend to be small, and can only efficiently cool small amounts of air. At high horsepower levels, or when using large turbochargers, FMIC's are much more efficient than TMICs

    from here:
    http://en.wikipedia.org/wiki/Intercooler
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    Registered User se7en's Avatar
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    Quote Originally Posted by rr1911 View Post
    what r u using to measure this performance loss ?
    +1
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    Registered User SubyPsycho's Avatar
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    Quote Originally Posted by rr1911 View Post
    i dont see how this is possible
    I'm with you on this. I don't see how it's possible. If he were having a fuel flow problem, I would expect the ecu to throw a cel because it has sensors to detect that kind of thing. It can even indirectly detect a fuel flow problem by the a/f ratio. Less fuel would mean a higher a/f ratio, which would increase exhaust temps, cause potential misfiring, and all kinds of other issues.

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    Registered User Mike502's Avatar
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    Quote Originally Posted by Bertus View Post
    Hi guys

    I am losing power to the car as the fuel gets below the half mark, then it will have poor performance until i fill up again. Why does this happen?

    Sounds to me like you one of 2 problems (or both)
    either you have an classic case of the automotive gremlin
    or...You need to have someone else drive the car and see if they experience the same thing...It may be a figment the imagination
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  11. #10
    Registered User ScoobVee's Avatar
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    how many miles do you have on it?


    Quote Originally Posted by rr1911 View Post
    u would be gaining hp by having less fuel
    Thats not possible, his power to weight ratio would slightly increase but not enough to feel from seat of pants
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  12. #11
    Registered User Micah's Avatar
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    Cold fuel is good fuel

    What are your driving habits compared to your refueling habits. If you are running it down, then filling it up - the fuel coming out of the ground is going to naturally be much cooler than ambient air more often than not (unless you live in a cold area).
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  13. #12
    Registered User SubyPsycho's Avatar
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    Quote Originally Posted by Micah View Post
    What are your driving habits compared to your refueling habits. If you are running it down, then filling it up - the fuel coming out of the ground is going to naturally be much cooler than ambient air more often than not (unless you live in a cold area).
    Is that even enough to make a difference though? I would suspect it would be such a small difference that the added weight of the additional fuel would cancel it out.

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