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boost issue to drive you crazy
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Old 08 Jul 2015, 12:49 PM   #1 (permalink)
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Unhappy boost issue to drive you crazy

Hi all ..

Been having some problem with my wrx here is the story .

Found the car in a barn and snapped it up as it was going for scrap , car was none runner due to cambelt slipped , retimed with new belt it ran well boosted well but a hesitation over .5 bar boost and the would cut the boost to .5 bar and that was it (no engine check light on ) I compression tested here and she was down a lot to around 75 psi but even over the 4 cylinders , leak tested cylinders and all were leaking through valves either exhaust or inlet It also had oil leave at rear of engine etc so I wipped it out heads off for a complete overall new gaskets etc oil separater plate , and full clutch and belt kits and so on . I put the engine back in with newage coil packs gapped the plugs , and fitted a another known working boost controller .. Now car runs spot on but when it boost she runs about .9bar if load it up in 4th or 5th and keep your foot in it she kills the boost to .5bar again so I'm lost tbf , the car a jap import v2 wrx with z4 ecu which it should be, ecu reads clear on flash code and no lights , do these cars monitor boost ? Any help welcome

Cheers luke
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Old 08 Jul 2015, 02:06 PM   #2 (permalink)
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Re: boost issue to drive you crazy

sounds like its hitting boost cut.

Really needs putting on a dyno to see whats going on, with all the new components it could well be a map issue
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Old 08 Jul 2015, 03:07 PM   #3 (permalink)
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Re: boost issue to drive you crazy

Hi pal cheers for reply

When your driving hard it's fine .9 bar boost which make me think it's not boost cut but when loading up boost at low rpm in high gears it only gets to .7bar and then she chucks it in to limp .5bar the engine is standard ish it has a cat back system and hks filter but nothing else cat still in place etc

Last edited by lancianut; 08 Jul 2015 at 03:10 PM.
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Old 08 Jul 2015, 07:11 PM   #4 (permalink)
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Re: boost issue to drive you crazy

Issue found cheers for the help
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Old 08 Jul 2015, 07:56 PM   #5 (permalink)
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Re: boost issue to drive you crazy

what had you done wrong ? lol
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Old 08 Jul 2015, 08:07 PM   #6 (permalink)
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Re: boost issue to drive you crazy

Quote:
Originally Posted by bugeye_bob View Post
what had you done wrong ? lol
Now that would be telling lol , seems I don't have enough fuel pressure iv only done a temp fix for now but need to find out what pressure it should run and fit a new one or an adjustable jobby
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