differences between turbo and non turbo forrester/impreza?

Discussion in 'Subaru Impreza' started by peter, Jun 27, 2005.

  1. peter

    peter Guest

    How do the different engines (2.5 vs 2.5 turbo) feel when driving a
    forrester or impreza?

    Do they feel different right from the start (low RPM), or do they feel the
    same until the RPM reaches, say, 3000?
     
    peter, Jun 27, 2005
    #1
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  2. peter

    Patrick Guest

    A turbo wont engage really before 2300,2400 RPM depending on the
    configuration.

    Think of your vehicle's engine as an air pump that draws in air and fuel,
    ignites the mixture--propelling the internal parts and expelling the hot
    exhaust gases. Turbocharging, like a vacuum cleaner, brings in air,
    compresses it, and changes the atmospheric pressure inside your vehicle's
    engine.

    A turbochargerd engine operates by the exhaust pressure exiting the engine,
    causing an impeller to spin a wheel. The impeller is connected (by a shaft)
    to a compressor; the compressor uses the energy from the impeller to spin
    and compress incoming outside air and forces it through to the engine. An
    actuator (attached to both the hot and cold side--the "hot" side is the cast
    iron portion of the turbo, the "cold" side, the aluminum portion) regulates
    boost pressure. The actuator can be "fooled" into thinking that the
    atmospheric pressure is different that it actually is!

    If you have the $ a Turbo car is really fun to drive and the extra power can
    save your life (Personal experience ), "" Or kill you depending on your type
    of Driving. If you like speeding a lot.... i would avoid a turbo car. ""

    Im a (Speed lover and agressive driver ) I currently drive a OBW with a
    2.5 @ 165 HP (5 Speed ) And it's a perfect vehicule for me. Fast enough
    but not enough to be a Racing machine Like the Impreza WRX STI.

    I would just like to improve the take off wich i guess is affected by the
    AWD. But againg my previous car been a 230 HP VW Jetta Turbo (
    Modified ) and a V6 4 Liter Jeep...

    Subaru should have improve the Torque by 20-30 Lbs Higher than the HP. Im
    sure it would make a big improvement


    Pat
     
    Patrick, Jun 27, 2005
    #2
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  3. peter

    Rat Guest

    Why not just testdrive them?

    I could not see myself ever going back to an N/A 4 cylinder subaru after
    having 6 cyl and turbo 4 in the svx and forester XT. The 2.5 and 2.2 and
    1.8 in non turbo form are just adequate. I have driven them all as we
    have many different subarus in the family. You have to flog the hell out
    of them to go anywhere fast. They are good engines, just weak for the
    weight of the car they are trying to move.

    The difference in power is stunning and the driveability up hills and
    with a full load is awesome with the more powerfull turbo 4 and H-6 engines.
     
    Rat, Jun 28, 2005
    #3
  4. peter

    Tom Reingold Guest


    Some of us are satisfied with mere adequacy, though I'm sure your
    observations are true.

    I'm getting 24 mph overall from my 2.5 N/A engine, which is
    disappointing. A turbocharged engine might get the same, but a
    six-cylinder would surely be worse.

    Tom
     
    Tom Reingold, Jun 28, 2005
    #4
  5. peter

    Rat Guest

    I get 20/27 in the svx with the 6 and about the same with the turbo
    forester :)
     
    Rat, Jun 28, 2005
    #5
  6. peter

    Tom Reingold Guest


    Wow, that's comparable to my measurements, since my driving is mixed.
    Pretty impressive for the H6.

    What does the turbo H4 get?

    Tom
     
    Tom Reingold, Jun 29, 2005
    #6
  7. peter

    Rat Guest

    About the same 20/25 for the turbo - a little worse than the svx H6 on
    the highway due to the 4.44 axle.

    The H6 does well on the highway mainly due to the 3.54 axle ratio. At
    90mph it is only turning 3k rpms :)
     
    Rat, Jun 30, 2005
    #7
  8. peter

    Tom Reingold Guest


    You're kidding! What is up with that!? I wish my car (2000 Legacy L
    wagon with 5-speed manual) had taller gears. I bet it would help fuel
    efficiency a lot. How come the H6 has taller gears than the H4?!

    Tom
     
    Tom Reingold, Jun 30, 2005
    #8
  9. peter

    iksalama Guest

    That kinda depends on if mods are done or not, I've gotten as good as 30
    even though I'm heavily modified. Prior to being modded I was getting under
    20 on a regular basis (wrx ej20) but since going to aftermarket engine
    management (utec) I've been able to tune it for gas mileage, spirited
    driving and outright drag racing/auto-x. IMHO the first mod anyone should
    get (even if they NEVER race their wrx/sti) is a UTEC and get it on the dyno
    so you can set it up for your needs.
     
    iksalama, Jul 12, 2005
    #9
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