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Title: Boost disapprears ???? Post by: elRey on April 24, 2012, 10:32:13 PM note my act boost vs req. and throttle plate and pedal.
I don't hear any release of pressure. Strange. t3/t4 + ebc, no N75 If I lower boost same thing happens but later on (higher RPM). log row 4600 Thanks, Rey Title: Re: Boost disapprears ???? Post by: elRey on April 24, 2012, 10:33:08 PM another log.
I also notice MAF dips WAY down the instant it happens, In some cases 0-1 g/s Title: Re: Boost disapprears ???? Post by: elRey on April 25, 2012, 01:23:33 PM No DTCs. And MAP goes -2.xx. That like 5 inHG.
Title: Re: Boost disapprears ???? Post by: IamwhoIam on April 25, 2012, 01:36:49 PM stock turbo intake hose? sounds like it's collapsing, very common on 1.8Ts.
Title: Re: Boost disapprears ???? Post by: elRey on April 25, 2012, 02:15:46 PM nothing close to stock.
There are two hoses that I would consider: turbo inlet -> (http://creativeion.com/rey/vw/16v_mk4/16vt_mk4_final_assem_04_sm.jpg) intake hose from MAf (mk4 vr6)-> (http://creativeion.com/rey/vw/16v_mk4/16vt_630cc_08_sm.jpg) (http://creativeion.com/rey/vw/16v_mk4/16vt_630cc_09_sm.jpg) Title: Re: Boost disapprears ???? Post by: elRey on April 25, 2012, 02:46:14 PM I'll put a t-clamp around the intake tube after MAF to give some support and see if that helps. If not I'll move it to the turbo inlet hose.
Title: Re: Boost disapprears ???? Post by: professor on April 25, 2012, 03:44:21 PM I don't think that turbo intake hose is the problem.
Title: Re: Boost disapprears ???? Post by: elRey on April 25, 2012, 04:28:12 PM Which one? The silicone 90 bend or oem vr6 maf tube?
Title: Re: Boost disapprears ???? Post by: littco on April 26, 2012, 03:04:42 AM Its a little odd the MAF goes down to 0 almost instantly, if you had a collapsing tip I doubt it would completely cut of air supply to the Maf. Even if the tip did collapse the interial of the air being drawn in just prior to the boost loss would give a reading on the maf.
I don't suppose you have a dodgy connection to the maf that's giving an issue. Title: Re: Boost disapprears ???? Post by: professor on April 26, 2012, 10:18:49 AM The 90 bend definitely not.
What littco say sounds logical. Title: Re: Boost disapprears ???? Post by: elRey on May 02, 2012, 07:49:17 PM believe it or not, it was the 90 bend.
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