924Board.org

jacobroufa · Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL

Wow this is all very intense. I don't know that I have nearly enough background or context to properly digest all of this information.

Can anyone recommend some resources to dive into learning more about the basics of turbochargers and how to understand e.g. the efficiency maps y'all posted? Any book or video or website would be super helpful. I know that my math background will hamper me here somewhat, but I'm very curious.

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For my purposes specifically I'm in the near-ish term interested in intercooling. Because I have most of the parts here and want to save some money until I can afford an Ideola TMCC, I am very very interested in the Eddie/Cedric method of re-indexing the compressor. Since the Audi 2664 compressor housing is a known viable option here, should I be on the lookout solely for the housing or for the whole turbo from which to take the compressor side? The only listing I'm seeing on US ebay for a full turbo right now is this one: https://www.ebay.com/itm/254462561357

Eddie does this part number 5326-970-6415 align with your expectations as to a part that would fit? I'd rather not spend $400 if I can get e.g. just the housing I need for less a la https://www.ebay.com/i/253012816193 or maybe I can find it cheaper still... I can't seem to find the thread where you document switching to the Audi cold side though -- can you shed some light as to what specific modifications you made to the 931 turbocharger and what extra parts I might need to think about? Or is it as simple as unscrewing the 931 compressor housing and screwing on the Audi one? (obviously also accounting for pressure management blowoff/recirc, and all the other things I have to think about here -- just concerned specifically with the turbo)
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1980 Porsche 931
1981 Porsche 924 Weissach

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2596 Location: MI

Yeah.. I have an Audi 2664 housing sitting right here next to my turtle tank, but you don't need it for a TMCC from Dan....

Yes it's as simple as unscrewing one housing and installing the other, and if you have a double open end/dual angle 10mm, you can do it without you even removing the turbo, if you are good, and patient..

My thread on my IC install is "Intercooler Or Bust".. http://924board.org/viewtopic.php?p=372350&sid=3b37a3f288cdebb57024234162b8c2a6

But the pics are all screwed up

Still have the pics though.. Somewhere..

2 videos on my youtube "Explaining My Intercooler and Turbo setup On My Porsche 924 Turbo / 931 P1/2" https://youtu.be/X2jbkENELMk
Part 2 - https://youtu.be/1wk3QW90cbM

Sorry for the poor lighting and dirty car though..

PN on my Audi turbo tag is 5326 970 6411
Comp housing PN is 5326 101 5071

If you want the TMCC I think you should just wait until you can afford that because the FMIC requires some mods and a little bit of body cutting that you don't have to do for the TMCC.. Namely the front toe hook and a little bit of the front valance..

Otherwise, sorry for hijacking your thread with all these offtopic discussions of CIS and Turbochargers n stuff..

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80 Turbo - Slightly Modified

jacobroufa · Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2596 Location: MI

ideola · Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI

Cedric · Joined: 27 Aug 2004 Posts: 2608 Location: Sweden

Theres not that much out there available for free, corky bells book called maximum boost could be a start, it floats around the net in a pdf if you Google it..
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1980 924 Turbo
www.instagram.com/garagecedric/

jacobroufa · Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL

jacobroufa · Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL

Been cleaning the heck out of my garage this week trying to get more usable functional space. It's an older 17' x 18' and with two small vintage cars -- my wife's '63 Beetle and the 931 currently -- it's pretty cramped. I've also been driving the Weissach a bit. But mostly focusing on the garage -- tossing a bunch of crap who knows why I kept, organizing and sorting through parts for all the cars, selling parts for cars I don't (or never did) own that I still have for some reason.. It's a long road but so far so good, and I am about to close on selling a bunch of parts which might let me pick up a TMCC sooner rather than later.

Current TODO list:

* replace lower pump -> rad hose
* replace upper thermostat 90° hose (this one split on my last drive, still waiting for it to arrive)
* replace front control arm bushings
* replace front shocks
* replace tie rod ends if needed
* replace ball joints if needed
* go through the remaining vacuum tidbits (just got some brass tees and more tiny clamps from mcmaster)

When I do the vacuum stuff, I might have to order a couple more elbows, and some of the straight pieces. I replaced a bunch of the line but I'm baffled by how much I missed and glossed over as "probably good enough", looking at it with a more critical eye. I forget where I saw it but somewhere on one of the 931 forums I recall someone saying that their car ran like a whole new car when they replaced all the vacuum bits. Pretty great. I'm looking forward to it.

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1980 Porsche 931
1981 Porsche 924 Weissach

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2596 Location: MI

Yeah man.. Just replace ALL the lines under boost/vac and be done with it.. I don't think the big charcoal canister lines matter much though.. Other than that just replace them ALL..

A couple hidden ones are the one that Goes from the turbo cold side to behind the timing belt.. It's a big 90..

The other end of that is accesable if you swing the alternator over to the driver's side.. Under the intake manifold off of runner #1 that goes down behind the timing belt.. It is just a straight one but big..

The small ones to the dist and wur on my car were the worst condition, but looked fine from the outside.. Deceptive..
By the looks of mine on the inside, I can't imagine any of them being even almost ok at this age..
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80 Turbo - Slightly Modified

jacobroufa · Joined: 18 Nov 2016 Posts: 529 Location: Belvidere, IL

Pulled all this mess out...

I see what you mean...

I thought I got all of them before, but there's definitely some need to refresh here. The elbows are OK, but not great, the short straight bits are toast. The hose to the brake booster and small vacuum tee off is also really starting to show wear; it's all cracked with age despite looking presentable if dirty on the outside. The small line is also garbage..

Presto change-o!

Upper: old 'n busted
Lower: new hotness

I did a bunch of other vacuum lines prior to this but only the upper ones. So here we go. I need to order some more elbows, small (18mm ID) and large (15mm ID), another brass tee (12mm ID to 3mm ID) some hose (18mm ID) and (12mm id). I need to consult the PET and search a bit more on the forum to be sure, but I think that's right.
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1980 Porsche 931
1981 Porsche 924 Weissach

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2596 Location: MI

nice..
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80 Turbo - Slightly Modified

Mike9311 · Joined: 14 Dec 2004 Posts: 1678 Location: Chicago-ish

Nice!

You ended up with some nice fittings from that engine. Hard to find this way nowadays
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car