Having some boost problems in 3rd and 4th?
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This is a discussion on Having some boost problems in 3rd and 4th? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey there everybody I am new to this forum and I am also new to the Subaru world. I just ...

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    Having some boost problems in 3rd and 4th?

    Hey there everybody I am new to this forum and I am also new to the Subaru world.

    I just recently bought an 02 Wrx that is somewhat fully built and that is still on a stock turbo.

    The car has CP Pistons, Eagle Rods, Eagle Bearings, ARP Head Studs, 03 Heads, Koyo Radiator, Aftermarket Crankshaft and much more done to it. The built motor only has 6,000 miles on it and it runs great. It is tuned from my knowledge by the Cobb Tuning accessport that came with the car.

    I had noticed a leak coming from the exhaust manifold flange and I replaced it yesterday. I got in the car, took it out and drove it and it runs great and the turbo comes up at lower rpms probably around 2500. But I'm not sure if the guy that had it before me might have had it tuned when it started leaking because when I first go it the turbo would not come in til around 4800. Now that I fixed it I am experiencing problems up top.

    The turbo is almost lagging in and out between 4000 and redline, It will spike then go back down over and over again in 4th gear. I'm not real sure what to do. Maybe a re-tune? Or maybe a bigger turbo?

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    Registered User bradsorensen's Avatar
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    i would have a pro re tune the car with the accessport. maybe a vac leak?

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    I don't think its a vac leak anywhere I checked that already. I am pretty sure that it is in the tune somewhere. The car is running 19psi on stock turbo also.

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    Registered User bradsorensen's Avatar
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    really i would think with those upgrades that a turbo and downpipe upgrade would be in there

  6. #5
    Moderator Donkey's Avatar
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    Probably needs a retune. Sounds like oscillating boost issues that are due to the turbo dynamics tables or WGDC tables needing tweaking.
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    Quote Originally Posted by Donkey View Post
    Probably needs a retune. Sounds like oscillating boost issues that are due to the turbo dynamics tables or WGDC tables needing tweaking.
    I figured out the problem today. It is overboost on that stock turbo, when I hit it around 4000 now it spools just fine. Thanks guys!

  8. #7
    Registered User teflon_jones's Avatar
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    Since when does a car with problems like this "run great?"
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
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    Quote Originally Posted by teflon_jones View Post
    Since when does a car with problems like this "run great?"
    Like I said it runs great until it boost cuts at a low rpm in 3rd and 4th.

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