Subaru liberty b4 twin turbo




Subaru liberty b4 twin turbo

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  • Find liberty b4 twin turbo ads in our Cars & Vehicles category. Buy and sell Subaru Liberty B4 MY06 GT AWD Tuned By STI Red 5 Speed Manual Sedan.

    Power upgrade guide for twin Turbo Subaru Liberty B4 2 litre engines Twin turbo engine pipes one with split collector to fit wastegate is necessary will add.

    Mention twin-turbos and most people assume you're talking about a car that's completely devoted to raw power. The Subaru Liberty B4 is much.

    Subaru liberty b4 twin turbo

    Subaru liberty b4 twin turbo

    Perhaps due to the lack of wild aero add-ons, the B4 is an elegant vehicle; unblemished thanks to an integrated aerial, flush-fitting glass and swoopy halogen headlights. It's rated at , rpm. At idle, the turbo spins at around 20, rpm and it can go on to a maximum speed of , rpm. Subaru Liberty B4 Twin Turbo 2.

    Subaru liberty b4 twin turbo

    Subaru liberty b4 twin turbo

    Subaru liberty b4 twin turbo

    Subaru liberty b4 twin turbo

    Subaru liberty b4 twin turbo

    AutoSpeed - Subaru Liberty B4 Twin-Turbo

    Click on pics to view larger images. Mention twin-turbos and most people assume you're talking about a car that's completely devoted to raw power. The Subaru Liberty B4 is much less of an animal - instead its twin-turbos are aimed purely at driveability.

    Internal developments have resulted in reduced valvetrain mass and an increased compression ratio up from 8. The Australian-delivered Impreza STis used a single turbo and made more power than the Liberty - kW versus the B4's kW at rpm - but they didn't offer Nm at a mere rpm or a Nm peak at rpm.

    Subaru liberty b4 twin turbo

    The hottie Liberty is set up to offer good throttle response and backs it up with a strong surge of torque anywhere in the rev range. The primary turbocharger is arranged to quickly deliver boost up to rpm, with the secondary turbocharger then kicking in to add flow in the higher ranges. It's a cunning system - but is it perfect? During the transitional phase - where the secondary turbocharger is starting to pump in addition to the primary unit - there's an ugly 'hole' in the torque delivery.

    Under full throttle, a significant dip in manifold pressure identifies the rpm transition; we measured a full 0. Similar to the high-strung STi Imprezas, the B4's on-road performance is very dependant on intake air temperature.

    Subaru liberty b4 twin turbo

    With seat-of-the-pants telling us heat soak r-e-a-l-y took the shine of acceleration, we again stuck on a boost gauge to see how the B4 reacted to increasing intake temperatures. With low ambient temperature and barely any under-bonnet heat soak, we saw a 0.

    But once heat soak set in after a couple of runs, peak boost slipped to 0. Obviously, Subaru has come up with conservative ECU mapping aimed at avoiding detonation. Fuel octane is another factor that can lead to detonation; for the B4, official Subaru literature suggests a "minimum required octane rating" of RON. Unfortunately, this ultra high-grade fuel can prove difficult to locate when you venture far from a major city. It's just as well the B4 has a litre fuel tank and - on average - sips around 10 litres per km.

    With its strong spread of torque, the B4 is a deceptively quick sprinter away from the lights. These sorts of acceleration times can partly be attributed by the traction of Subaru's long-standing viscous AWD system. With drive taken by a relatively lightweight clutch and a nice short-shifting 5-speed 'box, the B4 apportions torque front-to-rear depending on the rotational speed difference between the front and rear wheels.

    Subaru liberty b4 twin turbo

    Traction is also aided by a rear LSD. Combining with AWD is the B4's lowered Bilstein struts, which offer an excellent combination of ride quality and handling. Despite being set up quite firmly, the car manages B-grade public roads without any nasty surprises - though small-amplitude, high-frequency bumps induces slight patter.

    This goes away at high speed, where the B4 shows itself as a truly wonderful machine. The well-weighted, precise steering allows you to place the chassis wherever you want and it won't budge from that line.

    How the Twin Turbo setup in a Subaru Liberty B4 Works



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