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No but I've re-assembled and am resonably confident it wasn't the problem .. a bit embarrassing here but the pic I took was without the seperate flange,, when that is added and is tightened down ( when installed) that it is sealed.. Sooo back to the original non-boost issue..
I am able to get 0.4 bar out of it BUT it's black smoke and breaking up, pig rich.. so I"m back to chasing a vacuum leak somewhere I suspect.. Todd
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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Crotchety Old Bastard
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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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Here's another bit of info.. there's some oil around the bottom of the turbo,, not sure where it's coming from .. Could it be the turbo causing these problems ?? Todd
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon Last edited by 9dreizig; 08-17-2008 at 12:20 PM.. |
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Dude, you have a boost leak. Everyone was telling you that from the start but you were out blaming wastegate
![]() You turbo draws in lot's of air but it then leaks out. But fuel gets injected. That's why it goes rich. Leak this big easily overspeed the turbo as well, so you better find it quick. Check you intercooler O-rings and phenolic intake spacers for cracks.
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Don't forget to lift off the metal up-pipe from turbo to intercooler and check that o-ring (I'm sure Goran means that one too, just helping to spell it out: b-o-o-s-t-l-e-a-k ![]() Perhaps your boost leak, oil leak, and pending death of your turbocharger will be right there. Good luck |
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I used to have this problem on a 930 with a Andial intercooler. The stock pipe is modified to fit the intercooler and uses a blue intercooler high pressure hose that is clamped to the original solid pipe. Put in a new seal between the pipe to intercooler. Then drill and tap a hole in the pipe for the installation of a set screw. Under high boost the pipe can move down and the red o ring seal can bulge out ( usually in the back where you can't easily see the bulge )and create a pressure loss.
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Don't forget the o-ring at the bottom,
It's where the blue hose is on the picture above. If you have access to compressed air, you should rig up an intake leak tester... |
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Read this old thread, I'm having a similar problem.
Recently did the k27, primed on install, etc. First week, pulled strong. Now pulls 1.0 bar but the power is way down. Could the wg diaphram be shot? Turbo shot already(not primed enough)? tia c
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Tt, with mine it turned out to be the intake had a number of loose nuts holding it down, so the leaks were multiple ..
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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Make sure your stock wastegate is rebuildable, mine had a crack in the body, among other things. I pulled the trigger on a Tial, couldn't be happier. The stock WG is a good piece but it's also 25+ years old with lots of heat cycles.
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This is a good point and really, the stock wastegate should be taken apart and checked before new parts are bought. The "lip" on the body, bell housing side, that holds the diaphram in position, on mine, was corroded away about half way around . . . somewhat of a threadjack, I guess.
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I've gone native
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Good point. I'm gonna pull off the WG and look it over tonight.
I assume if I didn't prime the new k 27 enough and it was seizing, there would be other symptoms? Just thinking of all the possibilities. c
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There really is no such thing as "priming" the turbo other than making sure oil is flowing through it before initial startup . . . also, if the turbo was seizing, you would hear hellacious noise coming from it (screeching/howling and the like), and the overheated seals would be throwing oil.
Last edited by Ronnie's.930; 05-08-2012 at 10:05 AM.. |
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Makes sense. Thanx
Do you think my issue could be WG related given the fact it hits full boost? tia c
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I'm not sure about that . . . I believe that if the diaphram was torn you would overboost and if the valve guide was leaking too much air you would not get enough boost. Hopefully someone with more knowledge than I have will chime in.
Last edited by Ronnie's.930; 05-08-2012 at 11:57 AM.. |
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Crotchety Old Bastard
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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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I don't think it's heat soak, I have a big Andial IC and it's cool to touch all the time.
If the wg diaphram is torn wouldn't it still boost but leak like crazy/losing hp? |
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Torn diaphragm would allow you to over boost.
As said, if your turbo can make and your waste gate can maintain 1 bar, you have other issues. WUR pressures or maybe distributor is not advancing?
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Ken 1986 930, 1969 Mach1, 2003 540 Sport, 2016 R1200RS |
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I've gone native
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hard to tell if it's over boosting w the stock gauge pegged at 1 bar, I checked everything except the wg so far.
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But if it was overboosting, you wouldn't be complaining about low power.
![]() And theoretically, your overboost kill switch would eventually go off, and you would know when it did because the car would fall on it's face. I have a WG you can borrow.
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