| I've added what I call an ECU register viewer to Nissan Data Voice. With this you are able to display every register bank that is in the eprom after it is loaded into the ECU's micro. This of course happens when the ignition switch is turned on. There are 128 register banks. Each contain 256 bytes of data. 128 X 256 = 32768 which of course is the size of the bin file when you download it from the ECU. In the viewer I've added the ability to select how you want to "reference" view the registers. You can reference them as they are in the ECU micro or you can reference them as they are in the eprom. This pertains to the register location number. Once the eprom has been loaded into the micro the register locations shift by 128. Here are two pictures of the different register references as selected from two option boxes. These pictures were made using the snapshot feature which I will explain below. The selection can be made and displayed instantly once a register has been downloaded. It only takes a couple of seconds to download a register. The drop down box has a preset choice of registers to download. It ranges from 128 to 255 possible registers to download and view. Yes, one bank is not there because it is not readable. These pictures are the actual size of the viewer as it will be seen on whatever resolution your desktop is set to. The ECU register locations.
 The EPROM register locations.
 Then there is the list box of register references (also seen in the pictures above). When you click on one of the listed items in the list box the register locations for that item will be highlighted per the cell color you have selected. This only happens if you are currently viewing the register that it relates to. You can also click any cell and change it to the selected color. Clicking it again changes it back. Used to highlight a cell if needed. And when clicking any row the table above the columns change to the corresponding ending half of the register location. This helps to identify where the bytes of information belong. Then there is the snapshot feature. I have also added this feature to all map views. This allows you to capture the window and save it to a file. When clicking the "Save Snapshot" button you are prompted to enter a filename and can select where you would like to save the file. In the picture below I have entered the filename "Throttle Enrichment Table". Currently the pictures are saved in bmp file format but I plan on adding a converter to convert them to jpg files.
 And speaking of maps, I have now added map viewing of all possible maps. As has been pointed out in the past by Ash, there are more than just four maps. While working on this project I have found some neat things regarding the maps. I know some of this is somewhat old news but I just wanted to reiterate it here. First, there are actually six maps total. A high octane fuel map, a low octane (or detonation) fuel map, a high octane timing map, a low octane (or detonation) timing map, a high octane high gear map and a low octane high gear map. I found (or verified a members post on the NISTune forum) that the high gear maps are accessed when two circumstances are met. They are one, a TP of 88 has been reached or exceeded and two, an RPM of at least 3000 rpms has been reached or exceeded. This of course is with stock map scaling. It is in this state that the high gear maps are then accessed. However, with the way Nissan has programmed these maps (for the Z32) they are basically of no advantage. I'll explain this next. What I've found through testing and viewing maps from both 5 speed and automatic ECUs (300zx Z32) is that Nissan uses the exact same high and low octane fuel maps for the corresponding high and low octane gear maps. And likewise, JWT does the exact same thing. And, as everyone already knows, JWT also uses the high octane fuel and timing maps for the low octane fuel and timing maps. Now, not trying to start another debate but, I've read a document on Z1's website pertaining to tuning where it basically implies that if a tuner does not tune "down" (sort of speak) the high gear map (no mention of there being two of these maps) that it introduces an unsafe condition when driving at a constant rate of speed on the highway in high gear. By looking at how Nissan kept these maps the same as their respective high and low octane fuel maps, I do not believe this to be true and I'll explain below. Once you have reached a highway cruising speed it takes much less energy to maintain that speed so there should be no reason to attempt to change these high gear maps just for that purpose. However, if you do retune the primary and the secondary fuel maps YOU MUST retune the high gear maps to match if using the "SAME" TP scale (just as Nissan and JWT have). Changing the values in the high gear maps using the same TP scale can cause erratic engine behavior, loss of power or damage to the engine. Not saying any names, but yes, I have seen these maps tuned incorrectly by using the same TP scale. Now, what are the high gear maps. The high gear maps are an expansion for even more room for tuning. Under stock circumstances as well as the power Nissan was wanting to obtain and was able to obtain using the first set of maps, tuning in this area was not necessary. Once you have reached the stock TP of 88 at an RPM of 3000 or greater (or in other words, the last column of the map) the program in the micro switches to use the high gear maps. At that point, to maintain performance you must be at a point in the high gear map that matches where you were in the "normal" map. So lets say you move that point in the high gear map all the way to the left. You could essentially place it anywhere in the map as long as the TP and RPM scales correlated correctly. You would then have room for expansion and could tune the high gear map accordingly. This would be the correct way to tune and make use of the high gear maps. Only thing is, there is not much room for higher RPMs than what you may have already achieved. Not without much risk depending on how you tune the rest of the map. OK, a brief update on my condition. I had surgery to repair the nerve damage in my right index finger last Friday. My right hand is wrapped in a splint that completely covers my hand from my finger tips to mid forearm. I hope it was worth it because I'm supposedly going to be in this thing for about four weeks. And yes, I typed all this with one finger :) Thanks for reading, thanks for all the support and sorry for this being such a long read.
 www.mytwinturbo.com Nissan Data Voice - The first Nissan diagnostic software with a voice! Download my Nissan 300ZX Vin/Model Lookup. Check out more of my software at - www.MaXimusDVD.com -. Watch an ECZA meet caravan! |
Some info on maps and software features. - 
