924Board.org

Rich H · Posted: Thu Feb 11, 2010 7:13 pm Post subject:

Should be a series of logic tables I would think - if you have a full schematic it's just a matter of tracing it all....

_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

McGyver · Posted: Fri Feb 12, 2010 1:13 am Post subject:

Is it the same in 931?

I check that Ignition scheme from 931 and ther's different Battery (-) connected.
_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

McGyver · Posted: Wed Feb 17, 2010 6:38 am Post subject:

Parts list - first attempt:
last UPDATED 20.02.2010

IC's, Diodes, Transistors
V64 MC14011B
V58 MC14001BC
V57 MC14011B
V56 MC14071B
V54 MC14017B
V60 MC14011B
V53 MC14518B
V55 MC14017B
V67 MC14066BA
V52 MC14070B
V51 MC14069UBC
V65 MC14001BC
V62 MC14023BC
V66 RV3403ADC
V63 MC14070B
V59 MC14025B
V68 MC14516BC
V69 MC14028B

Transistors:

V03 BCY65EV
V02 BCY65EV
V04 BCY58
V06 BCY65EV
V01 2N2907
V05 BD240A

Diodes:

V12 1N4001
V14 1N4001
V1 1N4001

Diodes which needs to be checked:

v11 diode?? - could be replaced to 1N4148
v2 diode?? - could be replaced to 1N4148
v3 diode?? - could be replaced to 1N4148
v8 diode?? - could be replaced to 1N4148
v7 diode?? - could be replaced to 1N4148
v15 diode?? - could be replaced to 1N4148
v9 diode?? - could be replaced to 1N4148

V4 ZENER 4,7V diode ZPD 4,7 ITT
V10 diode?? - 457TK (or TD 6|8 ITT) UNKNOWN ??? what is this ???

V5 Not used
V6 Not used

Capacitors (most are WIMA - http://www.wima.com)

C22 0,47uF 100V
C7 1uF 100V
C19 0,047uF 160V
C18 0,022uF 160V
C4 6800nF 100V
C5 2200nF 100V
C9 470nF 100V
C6 680nF 100V
C10 0,047uF 100V
C17 0,15uF 100V
C16 0,15uF 100V
C8 0,047uF 100V
C1 0,1uF 100V
C20 0,047uF 100V
C12 100K 200V - i think it's 10pF
C2 101K 200V - i think it's 100pF
C3 101K 200V - i think it's 100pF
C25 101K 200V - i think it's 100pF
C11 1000nF 100V
C14 1000nF 100V
C24 3,3M 16V
C23 10uF 25/30V

After I make complete part list with scheme where parts goes I hope someone can compare it to other DITC units - 931Euro/US/937... and we can make some specs what needs to be changed and for what - should be easy to upgrade any 931 unit to 937.
_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

morghen · Joined: 21 Jan 2005 Posts: 8886 Location: Romania

great progress !
_________________
https://www.the924.com

McGyver · Posted: Thu Feb 18, 2010 8:10 am Post subject:

Tooday I completed parts list for 931US DITC - I have to check few diodes to make sure I correct identified them.

We've got 62 resistors - but in PCB we've got 72 places for resistors and 4 places for bridges.
All IC's onboard works on 5V power supply.
Unit is protected in most cases with few diodes 1N4001 and one 20V varistor.
We can find also three parallel connected resistors - which got one name (R20,R45,R46)
I found one trouble place... two different resistors got the same name - R62 but they not parallel or even connected toogether. The rest is ok.

OK so now

Who know electronics good enought to compare elements on other boards for example 931 Swedish/UK/Germany/ and of course 937. As I noticed DITC is quite good peace of electronic stuff and is really "bullet proof"

So don't worry is really hard to damage it.

Complete list of resistors used in US DITC (right now only resistances without tolerance groups and I want verify it one more time):
R1 1M
R10 12k
R11 22k
R12 100k
R13 12k
R14 47k
R15 1M
R16 18k
R17 18k
R18 390
R19 2,2k
R2 1M
R20 6,5K
R20' 1,5k
R21 330k
R22 18k
R23 1M
R24 10
R25 S14K - 20V varistor
R26 3,3k
R27 150
R28 47k
R29 47k
R3 7,5k
R30 47K
R31 47k
R32 150
R37 100k
R38 10k
R39 10k
R4 56
R44 340k
R45 1,8k
R45' 16K
R46 1,8k
R46' 11K
R47 220k
R48 220k
R49 Unused
R5 680
R50 47k
R51 1,5k
R53 10k
R54 1,5k
R55 100k
R56 18k
R57 3k
R58 56
R59 2,7k
R6 1,5k
R61 10k
R62 10k
R62' 150 under 1uF capacitor C7
R64 10k
R65 10k
R66 10k
R67 47k
R69 1,5k
R7 4,7k
R70 Unused
R71 Unused
R72 Unused
R73 Unused
R74 230k
R75 Unused
R76 270k
R77 69K
R78 Unused
R79 Unused
R8 3,3M
R9 1M
Under board 12k
W1 Unused
W2 Bridge
W3 Unused
W4 Bridge

And one shot from PCB where to look for which elements:

OK... anyone who can check that parts list with others PCB's please post it here or send to me - so I can go futher with that project.
I'm not sure yet but complete PCB with elements - working as 937 unit can cost about 100 Euros or even less. But that will show in future.
_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I checked both mine and most of the discrete parts are the same. I am guessing that the tuning area is R70-77. This is the difference that I have discovered so far:

R70 Unused 826k
R71 Unused unused
R72 Unused 611k
R73 Unused unused
R74 230k 259k
R75 Unused 902k
R76 270k 312k
R77 69K 69,8k

R10 12k 720 12k
R20' 1,5k 1,8k/6,2k 1,6k/10k
R8 3,3M 33m 33m
R9 1M 10m 10m
Under board 12k 720 12k

First row is position, second US third and fouth are UK/German.

Please note that these are high quality resistors with five ribbons, 4 for quantaty and 1 for tolerance. Sometimes even with a sixth ribbon for temp.

Everything is covered in epoxy so I couldn´t measure the resistors, had to "read" the colors which is difficult.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

McGyver · Posted: Fri Feb 19, 2010 1:57 am Post subject:

Please check this things in your DITCs:
Which bridge is connected W1 or W2? in US version is W2.
One track from 6'th leg of MC14001B - V65 is cuted in US.
Is there added diode V6 near pressure sensor in ROW?
And another parts like diode V5 and resistor R79 up from pressure sensor.
I'm not sure but is there in ROW one track from R66 is cutted?

I think that could be all changes between US and ROW... but I check it with photos later.
_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

No W2 bridge, just W1. The W2 is connected to the the extra card on one of the ROW DITC. Can´t see anything strange with the legs on V65. One diod on position V6. One diod on V5 and a 97k resistor on R79. A 10k resistor in R66, but there is a cut on the mainboard- yes.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

McGyver · Posted: Fri Feb 19, 2010 7:11 am Post subject:

I ask becouse I fonud that differences between DITC units from US and i think Germany or UK - i'm not sure... but definitely ROW.

If we want to upgrade weakest unit to most powerfull we have to noticed all even smallest changes

Another places:
There's not R30 on ROW...
On addional board we can found MC14011B - 2 diodes - 2 resistors and one capacitor (6??? 100V WIMA). Addional PCB has tracks on one side only so it can't be hard to make new one.

US unit in that places:

_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

From my German (ROW) DITC:

_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Nein37 · Joined: 29 Dec 2009 Posts: 513 Location: New London, CT

McGyver,
Is that another burnt trace I see in the first US DITC picture? If so, were both the units like that?
_________________
1981 931 CGT replica, OEM CGT intercooler, .8 BAR WG spring, GTS Headlights, Innovative Wide band A/F, A/C delete, 16" Fuchs, Weltmeister 200lb lowering springs, Bilstein HDs front, Koni Sport rears.

McGyver · Posted: Fri Feb 19, 2010 9:04 am Post subject:

No it's not burnt trace and it's on booth US units, it was cutted in factory, and it is under securing paint on PCB. So that cut it's some way to change settings in ignition timing, like other changed elements. In German DITC that trace is complete, but another one is cutted like on Gegge pics.
_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

McGyver · Posted: Sat Feb 20, 2010 6:19 am Post subject:

I found something interestig... in or out number 7 on PCB is connected in US version but in ROW that in/out? 7 isn't connected to anything - that track is cutted.

_________________
931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible)

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I confirm that #7 is not connected on the ROW DITC. As far as I know is is connected to the ignition module on the front right fender.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

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

I wish I had more to contribute to this thread, but I have to say, I am really impressed with the determination and progress. I do have a Euro 931 now, so if high resolution images are still needed for the RoW DITC, I could snap a few pix.
_________________
erstwhile owner of just about every 924 variant ever made