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Preferred location for mounting underhood MBC
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chuck21401  



Joined: 20 Feb 2005
Posts: 240
Location: Annapolis, MD

PostPosted: Thu May 28, 2020 10:57 am    Post subject: Reply with quote

bureau13 wrote:
Chuck, you and I were following a very similar path, until you lucked into that Trust controller. You don't see those too often! Got to put that beast inside


The Trust controller looks pretty cool. I figured that it wouldn't be available for long. I might have to mount it like this:


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CÚdric  



Joined: 27 Aug 2004
Posts: 1973
Location: Sweden

PostPosted: Fri May 29, 2020 12:44 am    Post subject: Reply with quote

Since im an engineer i wanted to buy something that is acutally engineered and have a specification sheet So i bought a precision pneumatic 3 bar pressure regulator. It works flawless and gives rock solid boost. Didnt cost more than the blue blingy things. I have a small version aswell, but this looks cooler and more old school, so its the one I have in the car. At the moment its in the battery tray, but Im thinking about mounting it in the glovebox instead

One day i will swap out the knob to something similar to the old school ones being discussed here.

Riegler 3 bar high precision regulator

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Mike9311  



Joined: 14 Dec 2004
Posts: 834
Location: Chicago-ish

PostPosted: Fri May 29, 2020 1:36 am    Post subject: Reply with quote

Cedric, what is the thread size on your regulator?
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA M650 Herausnehmbares Dach
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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CÚdric  



Joined: 27 Aug 2004
Posts: 1973
Location: Sweden

PostPosted: Fri May 29, 2020 3:13 am    Post subject: Reply with quote

G1/2, so i had to search around a bit to find a reducer to a small vac line
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Mike9311  



Joined: 14 Dec 2004
Posts: 834
Location: Chicago-ish

PostPosted: Fri May 29, 2020 3:28 am    Post subject: Reply with quote

CÚdric wrote:
G1/2, so i had to search around a bit to find a reducer to a small vac line




Sorry, not the for the fittings but for the knob?

Edit: and yes, G1/2 is huge. Over here in the US we get a lot of people trying to cross thread 1/8NPT into G1/4 (BSPP)
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA M650 Herausnehmbares Dach
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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CÚdric  



Joined: 27 Aug 2004
Posts: 1973
Location: Sweden

PostPosted: Fri May 29, 2020 4:06 am    Post subject: Reply with quote

Haha, I havent removed the knob yet, so i haven't actually assessed what i need to get a different knob on there
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chuck21401  



Joined: 20 Feb 2005
Posts: 240
Location: Annapolis, MD

PostPosted: Sun May 31, 2020 2:05 am    Post subject: Reply with quote

CÚdric wrote:
At the moment its in the battery tray,


By any chance do you have any pics of how you have that mounted and how you ran the lines?
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CÚdric  



Joined: 27 Aug 2004
Posts: 1973
Location: Sweden

PostPosted: Sun May 31, 2020 4:45 am    Post subject: Reply with quote

Haha, i won't show that mess its routed through a heat protective sleeve and then through the drain hole into the tray, and it's just sitting there, not fastened at all, since everything is temporary
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1970
Location: Somerset, UK

PostPosted: Mon Jun 01, 2020 6:12 am    Post subject: Reply with quote

chuck21401 wrote:
bureau13 wrote:
Chuck, you and I were following a very similar path, until you lucked into that Trust controller. You don't see those too often! Got to put that beast inside


The Trust controller looks pretty cool. I figured that it wouldn't be available for long. I might have to mount it like this:



Need the same racey interior too
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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chuck21401  



Joined: 20 Feb 2005
Posts: 240
Location: Annapolis, MD

PostPosted: Tue Jun 02, 2020 12:21 am    Post subject: Reply with quote

Carrera RSR wrote:
Need the same racey interior too



The 924 GTR interior is less spartan





Wonder if they would take a trade in?
https://www.porschenorthhouston.com/used-Houston-1981-Porsche-924+Carrera+GTR-1+of+17-0WP0ZZZ932BS72010
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Last edited by chuck21401 on Tue Jun 02, 2020 12:23 am; edited 1 time in total
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chuck21401  



Joined: 20 Feb 2005
Posts: 240
Location: Annapolis, MD

PostPosted: Tue Jun 02, 2020 12:22 am    Post subject: Reply with quote

CÚdric wrote:
Haha, i won't show that mess its routed through a heat protective sleeve and then through the drain hole into the tray, and it's just sitting there, not fastened at all, since everything is temporary


Trying to figure out if the boost controller would fit in there next to my battery. It would be tight.
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Mike9311  



Joined: 14 Dec 2004
Posts: 834
Location: Chicago-ish

PostPosted: Tue Jun 02, 2020 4:50 am    Post subject: Reply with quote

chuck21401 wrote:
CÚdric wrote:
Haha, i won't show that mess its routed through a heat protective sleeve and then through the drain hole into the tray, and it's just sitting there, not fastened at all, since everything is temporary


Trying to figure out if the boost controller would fit in there next to my battery. It would be tight.


You know my memory is being tweaked... I seem to remember back in the 90's, somebody running a manual boost controller somewhere around the ignition coil. I wish I could remember if it was a single setup or aftermarket
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA M650 Herausnehmbares Dach
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1970
Location: Somerset, UK

PostPosted: Wed Jun 03, 2020 4:09 am    Post subject: Reply with quote

chuck21401 wrote:

Wonder if they would take a trade in?
https://www.porschenorthhouston.com/used-Houston-1981-Porsche-924+Carrera+GTR-1+of+17-0WP0ZZZ932BS72010


I was standing in front of that car 2yrs or so ago when it was in the Porsche Experience Centre UK prior to auction. Spent a good hour sucking it up. Would have spent longer if I didn't have to get on the test track that day. Shame we weren't allowed to sit in it or start it
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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poor-sche  



Joined: 06 Jan 2017
Posts: 73
Location: Los Angeles, CA

PostPosted: Tue Jun 16, 2020 2:47 am    Post subject: Reply with quote

chuck21401 wrote:
This is my temporary set up and recognize that it isn't ideal.



It does take some fiddling to get the boost level right. I found that even a 1/4 turn can make a huge difference.

I've found that the boost level is mostly consistent...but after a long run the boost level creeps up. I'm wondering if it has to do with heat....and if that is the case...would need to find a cooler spot under hood.

...


I installed a turbonetics MBC over the weekend similarly to what you show in your picture but it doesn't seem to work. No matter the adjustment, 7 psi is the max boost I see on the in cabin gauge.

The strange thing is that previously it was set to 10 psi with a small spring loaded valve that worked fine. Since I couldn't get the turbonetics MBC to work, I reinstalled the previous setup, but now adjustments don't work on that one neither.

Any thoughts?


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chuck21401  



Joined: 20 Feb 2005
Posts: 240
Location: Annapolis, MD

PostPosted: Tue Jun 16, 2020 3:17 am    Post subject: Reply with quote

poor-sche wrote:

I installed a turbonetics MBC over the weekend similarly to what you show in your picture but it doesn't seem to work. No matter the adjustment, 7 psi is the max boost I see on the in cabin gauge.

The strange thing is that previously it was set to 10 psi with a small spring loaded valve that worked fine. Since I couldn't get the turbonetics MBC to work, I reinstalled the previous setup, but now adjustments don't work on that one neither.

Any thoughts?




If the WG is opening at 7psi that tells me that the line is not being restricted and that you don't have leaks in the control line...enough air is pushing the spring up to open the WG.

When I first connected the turbonetics MBC it didn't seem to work. I cranked it all the way UP (+) according to the +/- on the dial....and still had stock boost. It took me a while to figure out that turning the knob down actually increases the boost...turning it down restricts the flow. I turned the knob all the way down (-) and the boost went to the moon...I let off the gas as I saw the boost gauge heading to 12psi in a hurry. From there I was able to adjust it to 9/10psi. As I mentioned above...a 1/4 turn makes a big difference....so it might take several runs to dial it in.

Can you remove the MBC and test it to make sure that air is being restricted? If you turn it all the way down...no air should pass through it. Of course make sure the air is flowing the right direction. If you connect it backwards it might not work correctly.






Quote:
The strange thing is that previously it was set to 10 psi with a small spring loaded valve that worked fine. Since I couldn't get the turbonetics MBC to work, I reinstalled the previous setup, but now adjustments don't work on that one neither.


That doesn't make sense. Not sure what is going on there.
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