Buncha questions...
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This is a discussion on Buncha questions... within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I just bought a 2003 WRX with a 5 speed and 70,000 miles. I just had some general questions about ...

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    Buncha questions...

    I just bought a 2003 WRX with a 5 speed and 70,000 miles. I just had some general questions about the car that I had developed over the past 10 days since I bought it and have spent some time with it. First off, boost, my gauge reads to .15, but I never seen it boost past .1. Is that normal? The motor calls for 5w30 oil, but the dealer recommened synthetic 0w-40 Mobil One. I run in hot and cold conditions, what would anyone recomend for the mileage I have? I had owned one other manuel before, it was a 92 f 150 with a supercharged 5.0. When I shift my WRX, anytime my rpms are above 2000, when the clutch is disengaged, there is a 500 rpm jump, my old truck never did that. Is that common as well? What octane should I run? Would additives be a good idea? No racing, just everyday driving... any ideas how to increase fuel mileage without losing power? Thanks, any help would be much appreciated.

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    Registered User Hubiethesubie's Avatar
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    Quote Originally Posted by Miguel View Post
    First off, boost, my gauge reads to .15, but I never seen it boost past .1. Is that normal? The motor calls for 5w30 oil, but the dealer recommened synthetic 0w-40 Mobil One. I run in hot and cold conditions, what would anyone recomend for the mileage I have? I had owned one other manuel before, it was a 92 f 150 with a supercharged 5.0. When I shift my WRX, anytime my rpms are above 2000, when the clutch is disengaged, there is a 500 rpm jump, my old truck never did that. Is that common as well? What octane should I run? Would additives be a good idea? No racing, just everyday driving... any ideas how to increase fuel mileage without losing power? Thanks, any help would be much appreciated.
    .1MPa = 14.50psi, so yeah that's normal, I use 5w-30, the 500rpm jump is also normal, you should use at least premium grade fuel.
    ~My wife says I drive like a "grandpa", but she drives like a "bat out of hell"
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by Miguel View Post
    First off, boost, my gauge reads to .15, but I never seen it boost past .1. Is that normal?
    Yes.

    The motor calls for 5w30 oil, but the dealer recommened synthetic 0w-40 Mobil One. I run in hot and cold conditions, what would anyone recomend for the mileage I have?
    M1 0W-40 can be used year-round. If the oil used previously allowed gunk to accumulate around failed seals or gaskets, the synthetic oil may dissolve that gunk and expose a pre-existing leak or seep though.

    What octane should I run?
    At least 91 in the US.

    Would additives be a good idea?
    Only if you make money selling them.

    any ideas how to increase fuel mileage without losing power?
    There are maps for "stage 1" either from the open source or proprietary management vendors that end up leaning out the motor enough to actually increase efficiency provided the owner doesn't get vroom-happy with the added oompth they provide.

    For a stock car, follow the maintenance schedule, make sure it works as intended, check inflations, shift as early as possible, brake as little as possible, vary the throttle as little as possible, and design routes with mostly straights -- if there are turns, they should be right turns.
    Last edited by SD_GR; 03-25-2008 at 06:05 AM.
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    Registered User Dhbamby's Avatar
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    on my o4 rex, on the fuel door it says "premium use only"
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    i usually use 98 octane bu thats in aussie.

    and i also sometime get that 500 rpm jump.

    better fuel consumption = stay outa boost (as boring as that is)

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    Registered User rotorocker's Avatar
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    An rpm jump is normal?
    Just remember, capitalization and punctuation marks the difference between, "I just helped my uncle, Jack, off a horse." and, "i just helped my uncle jack off a horse"
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    Registered User Dhbamby's Avatar
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    An rpm jump is normal?
    i was wondering the same thing
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    i dont think the RPM jump is normal, tho mine does do it sometime, it feels lie the accelorator is alittlebit sticky as leting it go

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    Registered User Hubiethesubie's Avatar
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    Probably still pressing the accelerator when engaging the clutch. . . thus rpm spike. .
    ~My wife says I drive like a "grandpa", but she drives like a "bat out of hell"
    03 Wrx
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    Registered User Dhbamby's Avatar
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    Probably still pressing the accelerator when engaging the clutch. . . thus rpm spike. . ...
    this si the exact problem... i had this problem too but try to really exaderate the pedal transfer.....left off gas, wait a split secound, then engage clutch......once you get used to it you can so this transfer much quicker because you will know your car better.......
    MY Mods...
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    ok, I was mistaken about the boost, it only goes to .05. Normal now?

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    Registered User Dhbamby's Avatar
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    ok, I was mistaken about the boost, it only goes to .05. Normal now?

    no man thats only ~7 psi....you should be around .1 bar (14.X psi)
    MY Mods...
    2004 WRX OPB....58k...open source tuned...VF 39 Turbo...Pink 565cc injectors...Walbro FP... Godspeed FMIC...Turbo XS Stealthback Exhaust...Gimmik Turbo Inlet...Gimmik Rad. Hoses...COBB SF Intake...EXedy Lightweight Flywheel...F1 Racing Stage 2 Clutch...Perrin Crank Pulley...Perrin Afta-MAF Hose...HKS Up Pipe...Kartboy Short Shifter and Bushings....lots-o-suspention...

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    so what would that mean? It runs amazingly, I could just imagine if it ran at 7 more psi, now I'm kinda scared.

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    Registered User Dhbamby's Avatar
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    maybe your gauge is messed up....
    MY Mods...
    2004 WRX OPB....58k...open source tuned...VF 39 Turbo...Pink 565cc injectors...Walbro FP... Godspeed FMIC...Turbo XS Stealthback Exhaust...Gimmik Turbo Inlet...Gimmik Rad. Hoses...COBB SF Intake...EXedy Lightweight Flywheel...F1 Racing Stage 2 Clutch...Perrin Crank Pulley...Perrin Afta-MAF Hose...HKS Up Pipe...Kartboy Short Shifter and Bushings....lots-o-suspention...

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    ok, after really paying attention, when driving normal in 5th, the gauge stays at 0 to .02. When getting on it in 1st and 2nd, it never goes above .05. in third, it goes to about .08 when stretching the gear out, never above .05 in 4th, and only when really getting on it in 5th, I finally hit .1. I have never redlined it, so I don't know about that whole section in the gears, i think that would just hurt more than it would help.

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