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New fuel delivery (?) issue?
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Tue Jul 07, 2020 10:26 am    Post subject: Reply with quote

I am definitely in favor of it being that o-ring. To be honest, I'm not sure about the bracket. I've never actually had the lower charge tube off, I don't think. I will definitely take a look!
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1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Wed Jul 08, 2020 8:13 am    Post subject: Reply with quote

Minor update: I removed the upper and lower charge tubes. I do NOT have the bracket on the lower tube, for what it's worth. I'm betting that thing is NLA, but probably not a super popular item from wrecks. I'll keep my eye out.

The o-ring itself was not torn or anything, but it was a bit squished, and the lower tube came off the turbo a bit easier than I would have thought. I'm betting this is indeed the problem, and a new o-ring is on the way...
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1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2038
Location: MI

PostPosted: Wed Jul 08, 2020 8:25 am    Post subject: Reply with quote

Without that bracket, boost pressure in the pipe will keep lifting it off the turbo..
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Wed Jul 08, 2020 9:19 am    Post subject: Reply with quote

Fasteddie313 wrote:
Without that bracket, boost pressure in the pipe will keep lifting it off the turbo..


I would think the upper charge tube would hold it down. I realize that end of it's not fixed in place, but the throttle body end is, I wouldn't think it could move that far. Still, I guess once the o-ring starts to flatten out...

I guess I will try a little harder to find the bracket...
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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jacobroufa  



Joined: 18 Nov 2016
Posts: 286
Location: Rockford, IL

PostPosted: Wed Jul 08, 2020 11:06 am    Post subject: Reply with quote

There's a guy in southern IL that is parting out a few 931s on Marketplace that might have what you need:
https://www.facebook.com/marketplace/item/245639353517281
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Wed Jul 08, 2020 12:57 pm    Post subject: Reply with quote

Ooh, thanks for the tip! I will contact him...

jacobroufa wrote:
There's a guy in southern IL that is parting out a few 931s on Marketplace that might have what you need:
https://www.facebook.com/marketplace/item/245639353517281

_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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Mike9311  



Joined: 14 Dec 2004
Posts: 877
Location: Chicago-ish

PostPosted: Wed Jul 08, 2020 10:41 pm    Post subject: Reply with quote

One my first 80, I also did not have the bracket. It was my only 931 at the time so I never realized I was supposed to have one. No issues either even at 15 PSI. That was only a few times. Mostly 10-12

I remember when I finally saw there was a bracket. I was almost bummed that there was something else to remove if I had to take things apart.
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Thu Jul 09, 2020 9:34 am    Post subject: Reply with quote

The guy in Illinois had the bracket! So that's on the way, as is the o-ring. I hope that solves it....it seems likely that it will. Which is good, because with the Mittelmotor, Tial and boost controller, it's running great at 10psi, I replaced the leaky evaporator and I now have AC, and I swapped the shredded driver's seat back for a much better one from eBay, and I want to drive! Lol I hate finally having the car ready to go only to be grounded by a stupid o-ring...
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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chuck21401  



Joined: 20 Feb 2005
Posts: 261
Location: Annapolis, MD

PostPosted: Sat Jul 11, 2020 9:01 am    Post subject: Reply with quote

bureau13 wrote:
The guy in Illinois had the bracket! So that's on the way, as is the o-ring. I hope that solves it....it seems likely that it will. Which is good, because with the Mittelmotor, Tial and boost controller, it's running great at 10psi, I replaced the leaky evaporator and I now have AC, and I swapped the shredded driver's seat back for a much better one from eBay, and I want to drive! Lol I hate finally having the car ready to go only to be grounded by a stupid o-ring...


That was a lot of work! 10psi is fun.
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Sun Jul 12, 2020 1:27 am    Post subject: Reply with quote

chuck21401 wrote:
bureau13 wrote:
The guy in Illinois had the bracket! So that's on the way, as is the o-ring. I hope that solves it....it seems likely that it will. Which is good, because with the Mittelmotor, Tial and boost controller, it's running great at 10psi, I replaced the leaky evaporator and I now have AC, and I swapped the shredded driver's seat back for a much better one from eBay, and I want to drive! Lol I hate finally having the car ready to go only to be grounded by a stupid o-ring...


That was a lot of work! 10psi is fun.


If I figure out a way to add an intercooler or water injection, I wonder how high I can "safely" go without changing fuel... <evil laugh> With my old (bad) wastegate I was boosting up to about a bar if I would let it go, which of course I did not dare to do.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2038
Location: MI

PostPosted: Sun Jul 12, 2020 2:22 am    Post subject: Reply with quote

bureau13 wrote:

If I figure out a way to add an intercooler or water injection, I wonder how high I can "safely" go without changing fuel... <evil laugh> With my old (bad) wastegate I was boosting up to about a bar if I would let it go, which of course I did not dare to do.


As high as your AFRs will stay under like 11.5 probably..
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Sun Jul 12, 2020 4:00 am    Post subject: Reply with quote

Update: Crap! The o-ring did not fix the problem. Oddly enough, I did not have the rough running until it warms up problem...so maybe it did fix that. But light throttle I still get very lean readings and bucking. I need to put the smoke tester back on it and see if I can find a leak somewhere else.

This is the gods smacking me down for talking about adding more boost before I've fixed this basic problem.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Mon Jul 13, 2020 1:13 am    Post subject: Reply with quote

Well, this is frustrating. Smoke seems to be coming out exactly the same as before. I don't get it. Maybe I can put an inspection mirror and try to catch it when it first appears. By the time I see it wafting up it's hard to pinpoint an origin.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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bureau13  



Joined: 07 Sep 2017
Posts: 310
Location: South Florida

PostPosted: Mon Jul 13, 2020 3:17 am    Post subject: Reply with quote

It really does not appear to be coming from the o-ring I just replaced. It's possible that was contributing to the leak before, but the bulk of it seems to still be there. It also does not appear to be coming from the plate on the back side of the compressor. I cannot tell but the most likely candidate still seems that bypass valve cover. I'm far from 100% certain, but I certainly see some pretty dense smoke swirling in that area.

I put a wrench on those bolts and they were tight, but I could tighten the more. I don't want to overtorque them however. I can't think of anything to do at this point other than pop off that cover and replace the seals or whatever is in there.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2038
Location: MI

PostPosted: Mon Jul 13, 2020 3:41 am    Post subject: Reply with quote

The only seals are under each cover with 4 bolts through them..
IIRC I made new ones out of oil soaked leather from an old welding apron or something..
I think the old gaskets were like red and crystallized when I did mine..

I'm not 100% sure it's possible, but I would definitely attempt to do it without pulling the turbo..

These kind of 4 angle open end wrenches are magic for tight places like that..


And maybe a ratcheting 10mm.. Possibly a stubby one..
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