The best fuel to use

Discussion in 'General Subaru Discussion' started by 02blubru, Jul 5, 2006.

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  1. 02blubru
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    02blubru Well-Known Member

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    What is the best fuel to use in an 02 WRX, I see all the talk of non oxy, 93 oct 91 oct. What is the best for our cars?
     
    02blubru, Jul 5, 2006
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  2. TSTRBOY2004
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    TSTRBOY2004 Well-Known Member

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    the stuff that is flammable??? Not Flaming like Fong.....!!!
     
    TSTRBOY2004, Jul 5, 2006
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  3. wall of tvs
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    wall of tvs Well-Known Member

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    After running countless lines of datalogs over the years on different levels of tune with various maps, I have found that BP/Amoco is the fuel that my car likes the most.

    In other words, datalogs show that it knocks the least and allows for the highest timing.

    I have also found the whole "non-oxy" thing to be not worth the time. In some cases I've found certain brands of non-oxy to cause the ecu to lower the IAM to as low as 12. That's 25% less "knock correction" that could be added on top of the base ignition map. In other words, less power. I have never run non-oxy BP/Amoco fuel, so I cannot comment on that though.
     
    wall of tvs, Jul 5, 2006
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  4. Shane86
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    Shane86 Well-Known Member

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    Tom,
    i've put BP Non-Oxy in my car a couple of times, and it "felt" better.
    now, i know all about placebo effects, and have very little/no evideince to back this up, but i plan on filling up with BP NON-OXY tonight @ the station off of 494 and Bass Lake Rd. i'll do some data-logging when i get down to about a 1/4 tank.
     
    Shane86, Jul 5, 2006
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  5. WRX1
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    WRX1 _ Staff Member

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    Well, the non-oxy will give you alot better afr. When you run oxy/ethonol gas, your afr's will richen up. All I run in my car is 92 non-oxy, and my aim is always 16, and I have never seen the aim drop at all. In the next couple of weeks, I am really going to start digging into my tune to see what I can get as far as afr and timing goes, and then switch over to a blend gas and see what happens. The other thing you need to remeber is that every car is different, so you may be able to get away with a certain gas that other cars can't run. Also, if you get a custom tune, that will also lower your safety window, so you will want to stick with whatever gas you get tuned on.

    Russ
     
    WRX1, Jul 5, 2006
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  6. wall of tvs
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    wall of tvs Well-Known Member

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    Just because it's richer doesn't mean that it's worse. Ethanol has a much lower stoich value. Different fuels, different afrs. The determining factor is that your afr curve suits your fuel.

    But then again, you are probably the last person I would want to argue with on tuning, hehehe. ;) :)
     
    wall of tvs, Jul 5, 2006
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  7. Dynapar
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    Dynapar Well-Known Member

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    i have had very good luck w/ BP 92. my car seemed to rev smoother. no power differnces butit just felt nicer. like that new oil change feel.
     
    Dynapar, Jul 5, 2006
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  8. redheat86
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    redheat86 Well-Known Member

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    How about 100 octane from the hunny bee gas station off broadway in ghetto town, you know near elite?
     
    redheat86, Jul 5, 2006
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  9. JBark
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    JBark New Member

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    I've been running BP 92 nonoxy since I got my Aero last summer, and while I don't notice any "driving" difference between it and the 10% ethanol blend, I sure notice a mileage difference. Every tank with the nonoxy is 27-28mpg. I've switched to the 10% ethanol a couple times, and it's usually in the 23-24mpg range. I've put on 25k miles in 10 months, and a few mpg makes a big difference. :)
     
    JBark, Jul 6, 2006
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  10. wall of tvs
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    wall of tvs Well-Known Member

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    If you aren't tuned for it you might as well just mail me your money.

    :biggrin:
     
    wall of tvs, Jul 6, 2006
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