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  1. hotrodwrx

    Currently running mix of E85 in 2001 F250 5.4 V8

    Money !! and performance. E85 sells for 40 cents a gallon less than regular gasoline, where I live and is 105 octane which my turbocharged car absolutely loves. If I bought 100 octane unleaded gasoline I would be paying nearly $6.00/gallon. E85 $2.49 Regular $2.81 Premium $3.19 <----...
  2. hotrodwrx

    85 percent ethanol gas

    My experience with E85 is that for modern OBDII cars, up to 33% E85 is not a problem. I have been running high fuel ethanol mixes for 2 years now in a 2002 WRX with no fuel system problems of any kind. All the modern cars are warranteed to be save at 10% ethanol and my experiment leads me to...
  3. hotrodwrx

    Currently running mix of E85 in 2001 F250 5.4 V8

    Per my post in the E85 fuel thread, I have been running high ethanol mixes of E85 and gasoline for about 2 years in a 2002 Subaru WRX with no problems of any kind, as have some of my friends. Larry
  4. hotrodwrx

    E85 Fuel

    Just a note on this issue. I've been running E85 in a 2002 Subaru WRX for almost 2 years now with no problems of any kind. I started out at moderate levels and discovered the stock ECU would run out of fuel trim authority at about 33% E85 in the tank and throw a CEL for "too lean". In spite of...
  5. hotrodwrx

    Deriving Mass Air Flow, or Volume Air Flow, based on VE and HP

    It is common for supercharged and turbocharged applications to have BSFC ranging from .60 - .65 as they frequently run excessive rich mixtures so fuel dumping can be used to control detonation. The BSFC for the Subaru WRX (turbocharged) is about .59 based on the info I have seen. Larry
  6. hotrodwrx

    &quot;Proper&quot; intake air temp (IAT) sensor location....

    Is this fueling error across the board at all rpms, and boost pressures, or does it change with boost? If so it could be as simple as skewing the fuel pressure slightly. If the static fuel pressure or the absolute pressure across the injector (fuel pressure - manifold pressure) is not what the...
  7. hotrodwrx

    Water injection: BMEP and Peak Pressure

    Oops just noticed I typoed my post above -- should be corrected to read: The dry adiabatic lapse rate is about 5.5 deg F / 1000 ft altitude change, and the wet adiabatic lapse rate is about 3 deg F / 1000 ft altitude. Obanion: Obanion: Your right, I was just using the commonly quoted round...
  8. hotrodwrx

    Water injection: BMEP and Peak Pressure

    The higher BMEP as I understand it, is mostly a function of the higher specific heat of the added water, with a small contribution due to higher volumetric effeciency putting more moles of combustion products in the cylinder. It takes a larger energy loss to cool the cylinder contents as the...
  9. hotrodwrx

    Turbo V Engine - Exhaust Manifold Design

    You may also want to look at the Subaru WRX / STi for a similar situation. As it is a flat 4 2.0/2.5 Liter engine you have the same feed from 2 wide spaced cylinder banks problem you do with a V-8. The stock engines make 227 - 300 hp, but the big boys are pushing 750+ hp on the drag cars. The...
  10. hotrodwrx

    water injection to gas engines

    After searching around a bit I found the reference I was thinking about. It was not in the NACA reports (although they may also contain the same info) These refs all pretty much say the same thing, that the WWII aircraft engines in many cases injected both fuel and ADI fluid into the...
  11. hotrodwrx

    Dual Stage Fuel injectors?

    I think what you have been hearing about dual stage fuel injectors is what folks have seen with the larger PE injectors on the subaru WRX. Some of the tuners were trying to make sense of the way the fuel tables had to be setup. My understanding is that these injectors have a relatively slow...
  12. hotrodwrx

    water injection to gas engines

    By way of introduction this is my first post over here. I am the hotrod turboice mentions in credit on his web site, but had to change my handle slightly as it was already in use here. Turboice: In ref to your comment. The erosion of the blades discussion is very interesting, and may apply to...

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