924Board.org

Cedric · Joined: 27 Aug 2004 Posts: 2534 Location: Sweden

So the CGT also has an extra board? I posted pics earlier here where my swedish model DITC has an extra board where my enlish version do not. I wonder what that extra board do?
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1980 924 Turbo
www.instagram.com/garagecedric/

michal928 · Joined: 10 Sep 2008 Posts: 41 Location: Warsaw

The CGT DITC does not have an additional circuit board.

leadfoot · Posted: Mon Jul 25, 2011 7:51 pm Post subject:

probably to compensate for fuel differences seeing as boost curves would be the same...
what was the fuel like in sweeden in the 80's??
stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Cedric · Joined: 27 Aug 2004 Posts: 2534 Location: Sweden

McGyver · Posted: Tue Jun 19, 2012 6:34 am Post subject:

Ok... back in the game

I found a little free time last days and I started to make 937 DITC complete schematic. Unfortunately it took at least five hours to make just 12 from 16 (if i remember good) IC's... they not in any "parts list" for software I use so ... the only way is to create them from beginning but it's quite easy to check in data sheets what's inside.
Next part for some next days will be to connect everything together

I had to make it on A0 sheet

and I hope that will be enough.

One interesting thing.. which I found some time ago:
931 DITC - US version has connected line to output 7 - which is retard of ignition - connected to that jumper under the hood (PIN 3 in ignition module - (-B) If I check good)
In 931 ROW (Germany) version output 7 is cut... so jumper can't actually work.
I try to put some pdf with schematic soon, maybe that will help in some next research

_________________
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: 8787 Location: Romania

hmm..thats why i never really found any difference between wire on and wire off....i was worried my car has an electrical/electronic problem.

phew !!
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https://www.the924.com

McGyver · Posted: Tue Jun 19, 2012 9:22 am Post subject:

That's strange they add this function... even in 924 Tutbo Service Information bulletin or something like that they wrote about 7 degree retard when you disconnect that wire. If that is how this work... on ROW we got this retard enabled all the time, and only in US version you can turn it off or it's driven (on/off) by DITC itself.

But this means... in RoW units we got more advance... so they add that 7 degrees all the time to compensate that. But in US unit that should work in little different way then. I wonder how this will work with that jumper on/off... that has to be some changes which we can feel.

Can somebody tell me what is that book?

Any one can send me a e-copy of it??

_________________
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

That is the PORSCHE 924 turbo Service Information MODEL 81.

I got it, but am a bit reluctant to scan and send it to you since you still owe me money for the GTS/GTR catalogue.

EDIT: Sorry, it was Michal Walczak
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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: Thu Jun 21, 2012 11:40 am Post subject:

Ok... i found it in PDF

Can send link by PM if somebody need it too. I had all Service Information from 79/80/82 but that 81 was really hard to find.

And as I expected some things from it could help with identifying inputs/outputs from DITC. I will have some days off so hope to make some progress with wiring scheme.

_________________
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)

yulas · Joined: 31 May 2023 Posts: 2 Location: Poland

Hello!
I am fixing a porsche 924 turbo for a friend.
I have a problem with DITC. When starting randomly, the tachometer shows 3000 rpm and the engine stops - ignition occurs at random times.
I would like to replace the sensor with a modern one and connect the signal to DITC. On MC14017B, I found the place of the impulses from the trigger wheel. I would like to compare with the schematic if it exists.
Regards

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

That info may be in 924 turbo supplements to the shop manual (81+.) There is a 924 turbo binder that gets added to the 924 shop manual set, then there were supplements to that for various years, representing changes (like DITC.)
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

kondzi · Joined: 02 Jul 2018 Posts: 485 Location: Poland/EU

yulas · Joined: 31 May 2023 Posts: 2 Location: Poland

Thank you for the hints.
The engine is after repair so I checked if it is assembled correctly. It looks like the flywheel is shifted

. The mark in window Z1 does not match the pulley and camshaft wheel. Therefore, the ignition is very early.
The alignment of the crankshaft to the camshaft is correct. 12 bar cylinder pressure.
Good thing I didn't build the engine.

Z1 https://drive.google.com/file/d/1ab-3Sap0JrecWOyVno_InEmwhROpeyf0/preview

Point camshaft https://drive.google.com/file/d/1awym0ZQMrfM_PPspuhA_gwZRNARGaQDM/view?usp=sharing