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copy of 937 DITC unit
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Cedric  



Joined: 27 Aug 2004
Posts: 2600
Location: Sweden

PostPosted: Thu Jun 23, 2011 2:33 am    Post subject: Reply with quote

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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michal928  



Joined: 10 Sep 2008
Posts: 41
Location: Warsaw

PostPosted: Sat Jun 25, 2011 7:03 am    Post subject: Reply with quote

The CGT DITC does not have an additional circuit board.
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leadfoot  



Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia

PostPosted: Mon Jul 25, 2011 7:51 pm    Post subject: Reply with quote

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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Cedric  



Joined: 27 Aug 2004
Posts: 2600
Location: Sweden

PostPosted: Mon Jul 25, 2011 11:37 pm    Post subject: Reply with quote

leadfoot wrote:
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


I think we had 95-96 and 98 octane at that time, up to 88 when catalysts were a legal demand all fuel had lead enrichment. After that only 98 were had led until the 90s.

I dont know if we had some other emission demands at that time, must check this a bit more.
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McGyver  



Joined: 24 Feb 2009
Posts: 354
Location: Jelenia Gora - Poland

PostPosted: Tue Jun 19, 2012 6:34 am    Post subject: Reply with quote

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
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morghen  



Joined: 21 Jan 2005
Posts: 8868
Location: Romania

PostPosted: Tue Jun 19, 2012 6:42 am    Post subject: Reply with quote

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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McGyver  



Joined: 24 Feb 2009
Posts: 354
Location: Jelenia Gora - Poland

PostPosted: Tue Jun 19, 2012 9:22 am    Post subject: Reply with quote

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??

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931 82' - 5000km after full engine rebuild

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



Joined: 27 Jul 2007
Posts: 1124
Location: Sweden

PostPosted: Tue Jun 19, 2012 8:56 pm    Post subject: Reply with quote

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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McGyver  



Joined: 24 Feb 2009
Posts: 354
Location: Jelenia Gora - Poland

PostPosted: Thu Jun 21, 2012 11:40 am    Post subject: Reply with quote

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.
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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)
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yulas  



Joined: 31 May 2023
Posts: 2
Location: Poland

PostPosted: Thu Jun 01, 2023 11:56 pm    Post subject: Reply with quote

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
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stevekat  



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

PostPosted: Fri Jun 02, 2023 4:34 am    Post subject: Reply with quote

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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kondzi  



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

PostPosted: Fri Jun 02, 2023 5:19 am    Post subject: Reply with quote

yulas wrote:
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


Check my resurrection thread.
https://www.924board.org/viewtopic.php?t=43790&sid=5d3325c226a70d6ca47cdf5a1798b4d3

There is a guy in the forum that is making brand new sensors for 931 DITC.

https://www.924board.org/viewtopic.php?t=45010&postdays=0&postorder=asc&start=30
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yulas  



Joined: 31 May 2023
Posts: 2
Location: Poland

PostPosted: Sat Jun 03, 2023 4:23 am    Post subject: Reply with quote

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
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