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20psi on stock 4.8

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Old May 15, 2012 | 02:59 PM
  #11  
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UPDATE .... so I got it to the carwash and washed the oil out of the engine bay, then hit the road. Still a haze of blue smoke behind me, I pulled over and the engine bay was good, the smoke is coming from the exhaust. Out of the down pipe actually, I don't have an exhaust system on it yet. Downpipe is wet with oil. Not good. I'm guessing the turbo is either over oiling or I burned a hole in one of the pistons with my 20psi experience. Any guesses? I'm going to do a compression check tonight. Still seems to run ok, considering its a baseline tune. Still builds boost beyond 3000rpm, but I haven't taken it beyond 5psi since fixing the wastegate.
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Old May 15, 2012 | 03:01 PM
  #12  
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Definitely compression check that thing. Could have broken ring lands and oil contaminating the chamber. Post up man, I hope it's okay!
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Old May 15, 2012 | 05:02 PM
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this sounds very similar to how my last build went... it didn't end well. im hoping the dipstick just came out because of your pcv setup, thats what it was for me. hope the best for you man!
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Old May 15, 2012 | 05:06 PM
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Ya I hope so. I was talking to a mechanic at work and he asked if my brakes still worked at an idle/low rpm, as he said if you have serious compression loss you will have no/marginal power brakes. My brakes are still firm at all rpms, and the engine still sounds pretty good, so I'm trying to stay optimistic. Like I said in a previous post, I had it up to 5psi today and the dipstick stayed put. I will be doing a compression check as soon as I get home from work, will post the results asap.
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Old May 15, 2012 | 05:54 PM
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hope everything is alright. sounds like you are having some wastegate issues as well w/ boost that high. vacuum line on the right port? live tune would be a good idea as well being FI. i've spent hrs on the dyno and street getting mine where i want it.
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Old May 15, 2012 | 06:50 PM
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Best of luck man. If its good, you have a drain line issue or maybe need to run a oil feed restrictor to your snail. That should fix you up. That fact you said you have straight noticeable oil on your DP has me worried though.
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Old May 15, 2012 | 08:25 PM
  #17  
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This sounds familiar. A few months ago another board member had just put on his first turbo on his stock motor and routed the waste gate backwards and the same thing happened and he blew his motor. Hopefully that is not the case for you. Too much oil to the turbo would be a culprit for the blue smoke. Let us know how it goes.

Last edited by Spoolin; May 15, 2012 at 09:46 PM.
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Old May 15, 2012 | 08:41 PM
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Originally Posted by Spoolin
This sounds familiar. A few months ago another board member had just out his first turbo on his stock motor and routed the waste gate backwards and the same thing happened and he blew his motor. Hopefully that is not the case for you. Too much oil to the turbo would be a culprit for the blue smoke. Let us know how it goes.
I remember that one too. He said it ran like a raped ape for a second
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Old May 15, 2012 | 08:45 PM
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Update...just did a compression check, reults are:

1 - 130 2 - 120
3 - 50 4 - 115
5 - 50 6 - 120
7 - 50 8 - 130

Excuse me, I think I'm going to go throw up now.
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Old May 15, 2012 | 08:52 PM
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Pistons, broken skirts, burned. Sorry bro
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