Ditron 812D D-Jetronic Tester, Searching for instruction |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Ditron 812D D-Jetronic Tester, Searching for instruction |
nordfisch |
Dec 11 2015, 07:25 PM
Post
#1
|
Member Group: Members Posts: 86 Joined: 11-December 15 From: Germany Member No.: 19,451 Region Association: None |
Hi,
this forum was recommended to me... and this is really a great place for guys like me, interested in the D-Jetronic system. We have a forum in Germany, German and English language "oldtimer.tips", too. We are more conservative than you are, mostly just trying to find out everything about the system and how to repair the components. We are hobbyists mostly MB, but also BMW, VW, Opel, Porsche, Renault, Citroen, Lancia... all the car brands D-Jetronic was installed in. I by myself designed a tool for re-adjusting the trigger points to the original values. Simple to be rebuilded if you have a lathe - I will send you a figure on request. Now my own request: Does anyone here own a Ditron 812D tester, too? I own such a device, but without any instruction. It once came to Europe with the instruction, but it got lost. I bought the Ditron some months ago on ebay from switzerland - the seller told me he had bought it many years ago at ebay USA. It's no problem for me to understand and use the basic testing functions, but this tester is not only a testing - but an ECU-simulating device. I don't really need the Ditron 812D to diagnose or optimize my car - I own some other testers. But because the D-Jetronic-system is my hobby, I would like to understand the additional function, i.e. what the manufacturer intended the user to test / adjust with it. Hope that someone still has the instruction for the tester... My tester has serial #119 - don't know how many were built at all. P.B. "Brad" Anders described the tester: D-Jetronic Testers as being similar to the Janbo Model 112 he described more detailed. Does anyone own the tester / the instruction? Please help... Regards Norbert |
JeffBowlsby |
Jan 24 2016, 09:40 AM
Post
#2
|
914 Wiring Harnesses Group: Members Posts: 8,510 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
Norbert, I have spent a little time on that oldtimer website and while I virtually all that I see, I have one little nagging issue.
He refers to the MPS as a MAP sensor and it is not. Modern cars use a MAP sensor but the MPS is not a MAP sensor. Its been a long time since I read it and I do not own a copy any more, but I think it was the big blue Bosch book on fuel injection that describes the differences. Forgive me if I misstate the differences but this is what I recall: Manifold Pressure Sensor = senses intake manifold pressure which is a value in relation to atmospheric pressure. Manifold Absolute Pressure = would be an absolute pressure value value not related to atmospheric pressure. Can you speak to V. HUck about that for clarification? |
pbanders |
Oct 23 2016, 07:12 PM
Post
#3
|
Senior Member Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
Norbert, I have spent a little time on that oldtimer website and while I virtually all that I see, I have one little nagging issue. He refers to the MPS as a MAP sensor and it is not. Modern cars use a MAP sensor but the MPS is not a MAP sensor. Its been a long time since I read it and I do not own a copy any more, but I think it was the big blue Bosch book on fuel injection that describes the differences. Forgive me if I misstate the differences but this is what I recall: Manifold Pressure Sensor = senses intake manifold pressure which is a value in relation to atmospheric pressure. Manifold Absolute Pressure = would be an absolute pressure value value not related to atmospheric pressure. Can you speak to V. HUck about that for clarification? Only the MPS used for the Mercedes-Benz applications is able to compensate for atmospheric pressure differences (i.e altitude and weather). Your interpretation is correct, and I believe Volker explains it well in his response to your question. |
nordfisch |
Oct 24 2016, 12:32 AM
Post
#4
|
Member Group: Members Posts: 86 Joined: 11-December 15 From: Germany Member No.: 19,451 Region Association: None |
.... Only the MPS used for the Mercedes-Benz applications is able to compensate for atmospheric pressure differences (i.e altitude and weather). Your interpretation is correct, and I believe Volker explains it well in his response to your question. Thank you so much for all your work and explanations, Brad. There are some other cars / manufacturers equipped with sensor 'type III' with compensation - late Volkswagen type III, Opel (GM), Citroen, Jaguar. Sorry, I have no time left at this time, will add explanations etc. later. Regards Norbert |
Lo-Fi Version | Time is now: 20th May 2024 - 03:06 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |