Hey Ray and forums, just found this site with alot of info on injection stuff.
http://members.rennlist.com/pbanders/DJ ... .htm#parts. Have you seen this? Bill
Good reference site?
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raygreenwood
- Posts: 11912
- Joined: Wed Jan 22, 2003 12:01 am
Yes...read every bit of it. Brad is about the most knowledgable persson I have ever seen about how the sysstem is made and put together and why things were done. He has done a most impressive amount of testing and work. I think he is an electrical engineer (?). He and I disagree on a few minor details of what is possible with this system sometimes. He is 100% correct about what happens inside the ECU, and why according to the original patent drawings, things were made the way they were, but after 25 years of working, tuning and driving D-jet, I have found there are a great many minor details wherin you can tune...and"lie" to the system to achieve some results that the factory just does not have answers for. Mind you...I cannot change the mapping of the ECU...but I can change the timing of and somewhat affect the signals the ECU uses to make decisions. I have learned a lot from his work...and have confirmed a lot of suspicions that I was pretty sure of...but also needed someone looking at the same things I was....to really make sure of what I was seeing.
I don't fully subscribe to staying within the factory tuning limits...mainly because in the early years of D-jet, they were fairly crude...compared to how I adjust mine. In later years, for instance, you begin to see a variation in the spring length on some MPS. There were ong and short spring types used within same models at different times. They also began grading the variations within the MPS via paintmarks. Yellow, brown, green. Not yet sure what each pertained to adjustment wise, but generally they had to do with adjustment levels in spring tension to the armature stack.
I also augment the fuel pressure loop to much better/more stable than factory and make small sensitivity mods to the TPS...that bring on the need to make the MPS slightly more sensitive...and change its response to vacume. Brads site is an excellent must read. Ray
I don't fully subscribe to staying within the factory tuning limits...mainly because in the early years of D-jet, they were fairly crude...compared to how I adjust mine. In later years, for instance, you begin to see a variation in the spring length on some MPS. There were ong and short spring types used within same models at different times. They also began grading the variations within the MPS via paintmarks. Yellow, brown, green. Not yet sure what each pertained to adjustment wise, but generally they had to do with adjustment levels in spring tension to the armature stack.
I also augment the fuel pressure loop to much better/more stable than factory and make small sensitivity mods to the TPS...that bring on the need to make the MPS slightly more sensitive...and change its response to vacume. Brads site is an excellent must read. Ray