Question about 1997 Subaru Legacy

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No boost my 1997subaru legacy GT TWIN TURBO has lost its turbo boost,the car is very slow and drinking fuel,can you help please?

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  • UpDawg Aug 10, 2008

    97 legacy GT boosting the first turbo but little to no boost in second turbo also running rich? ECU?

  • tredditchi Aug 14, 2008

    i have 99 impreza wrx,turbo was boosting 1.3 bar now it's only 0.8 i did check all connections and rubber hoses and they looks good.any ideas what happend?please help

  • shane bland Aug 21, 2013

    if the secondary is running low boost. tkae your topmount off and there is a switch over vbalve which looks like a actuator. they tend to jam up causing the first turbo to not let your secondary to spool up. clean that to free it up a bit and also check your sensors in the black sensor box

  • shane bland Aug 21, 2013

    check the switch over valve under your topmount they tend to seize and not let the secondary spool up. also check sensors in the black sensor box one mayb faulty ( boost solinoid )

  • Anonymous Mar 13, 2014




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Check all the rubber hoses to and from the inner cooler for cracks, make sure all the clamps are tight.

Posted on Aug 07, 2008


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Subaru legacy boost

It sounds like a lack of fuel to the injectors. check the fuel manifold pressure and the regulator. run fault codes to check for faulty sensors.

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I have a Subaru Legacy B4 Twin Turbo 2.0ltr. It

indicates several problems
first is that the scan tool has not got the right protocols for reading the Subaru ECM as there are fuel mixture faults recorded
next check the vacuum hose to the turbo vane actuators and that the vanes are free to move
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What is the average boost for a 2002 subaru legacy twin turbo?

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May 05, 2011 | 2000 Subaru Legacy

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I have subaru b4 legacy 1999 with twin turbo from Japan and I would like to increase the torque and speed. Where do I start.

hi i would invest in an electronic boost controller, they remove the dead spot in the revs before the big turbo winds in, they are worth a few hundred dollars but are well worth the money. You also have the option of turning up the boost safely a few psi with these but you will love the difference without the dead spot it will seem like a new car to drive. If you do that and want more still i would get a turbo upgrade, ecu upgrade, fuel pump upgrade etc do all that you can before going with the expensive motor rebuild

Apr 16, 2011 | 1999 Subaru Legacy

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Just had main turbo replaced in gt twin turbo legacy. and it is still producing blue smoke.

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Mar 08, 2010 | 1995 Subaru Legacy

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Subaru Legacy GT CEL code 66

There is a differential pressure sensor mounted beside the 2wd fuse link with a couple of 5mm pressure lines going in each end. These lines connect to each turbo output. The two pressures acting on each side of this sensor produces a voltage read by the ecm which tells it the differential pressure between both turbo boosts during acceleration. Normally the primary turbo leads the boost and the secondary turbo plays catch up until the pressures are even then air valves get opened and shut to bring the second turbo compression in parallel with the first turbo. The two turbos simply act in sequence but function in parallel. Its just like having one big turbo but operating down two smaller paths.
The sensor measures the changing boost pressures as the second turbo rises to equal the first.
If the generated voltage is not what it expects it shows as a code 66. As you can start to see there could be many different reasons why there might be an imbalance in the two pressures.
It could be either turbo causing the imbalance or a faulty bypass valve or pressure relief valve or a number of other issues. It doesnt necessarily have to be a turbo or a solenoid which is faulty. All it means is that the pressure difference between the two boosts is wrong.
The real question is why is it wrong.
There is a lot you can do yourself to diagnose the cause. If you are able to study the manual which is available free off the internet (do a search for the link) then you will see that you can test many of the component parts quite easily at home and also temporarily replumb the turbos to bypass aspects of the system control to figure it out for yourself. To do this you will have to gain an understanding of how the twin turbo system works. However its not hard if youi strip away the complex jargon hiding simple functions.. There is a mystique of fear concerning working on these motors which is not justified.Just use common sense and logic.
Or you take it to a shop and pay someone else to do it for you.

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Just wondering if it possible to make the twin turbos on a 2002 legacy gt work at the same time like a single turbo instead of converting it to single turbo

The turbos are two different types.One is designed to start a bit lower in the revs and the other to come in when the revs are higher.Its called compounding boost.It can be changed but to put it on a sinlgle turbo would cost a fair bit.If you hot up the ones you have by recalibrating them and exhaust,you do get VERY big gains.The car is more driveable and you can get big boosts in power if the tuner knows what he is doing.Some really big horsepower units come from triple compounding turbos and the torque levels are extremely high.Hope this helps

Sep 16, 2009 | 2002 Subaru Legacy

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My sub

Jun 29, 2009 | 1999 Subaru Legacy

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