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Registered
Join Date: May 2008
Posts: 1,252
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Boost Stutter Help
Greetings
It's been awhile since I been on the board. I had a broken head stud that took the longest time to fix and front oil cooler leaks. Changed plugs and got my pesky oil leak/air intercooler leak (andial) fixed with a good T-Bolt clamp. Took the car out and all felt ok until boost was coming in. Face-fell forward. Happened in the past and purchased a genuine p-boost sensor, not to long ago. I have a feeling the wastegate internals are getting stuck inside. After almost an 1hr. of driving and going on and off the pedal for boost, It finally loosened up, and no face plant. Before I attack the wastegate and take it apart. Is there alternative rubber diaphragm to put in.. Sticker Shock...owww... Did check hoses and other stuff on the engine after shutdown- Engine bay was oil free...Oh-- I am hitting 1.0bar with no problem.. Thnxs Walt Last edited by wjfk32; 10-25-2016 at 12:01 PM.. |
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10-25-2016, 11:40 AM
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I bet the wastegate was just sticking and not opening, and the boost level rose high enough to trigger the overboost switch, which cut ignition. As you said, after a few runs the valve loosened back up and now it is operating as it is supposed to by keeping your max boost within limits.
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Emery 1988 930 coupe - Silver Metallic TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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10-25-2016, 02:48 PM
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Crotchety Old Bastard
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Take the WG off and spray the valve and seat liberally with solvent. That should clean off the carbon. After that spray with WD40 or like lubricant that has a bit of light oil in it. Just a light misting of that as it will burn off. Bench test it with your compressor set at a little over 1bar and observe the cracking pressure action for smoothness.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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10-25-2016, 04:55 PM
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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,396
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Sheet Walt, we've missed you! I too think a simple cleaning of the WG will do the trick.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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10-25-2016, 05:43 PM
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Registered User
Join Date: Mar 2012
Location: NC
Posts: 1,236
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Tial F46 is far superior to the factory unit and generally less expensive than the cost of a rebuild...
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10-25-2016, 06:32 PM
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Registered
Join Date: May 2008
Posts: 1,252
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Thank you for your help-great hearing from everyone
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10-26-2016, 03:46 AM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
