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- SR20DET 62 ECU DIAGNOSTIC SCREW RUN POSITION SERIES
- SR20DET 62 ECU DIAGNOSTIC SCREW RUN POSITION DOWNLOAD
Windows has a scientific calculator that works pretty good but switching screens all the time is inconvenient. Very large numbers like FFFFhex is equal to 65535dec and being that we do sometimes use numbers as large as this in tuning, a scientific calculator is a wise investment especially if you plan on tuning EPROMs for customers. I have made up a very basic decimal to hexadecimal conversion chart that will be useful to you. As you can see it becomes very important to specify what base we are using since the numbers can look very similar but have very different values. Larger numbers get more complicated such as 16dec is equal to 10hex, and 20dec is equal to 14hex. So our normal 9dec is equal to 9hex, and 10dec is equal to Ahex. Our normal numbering is called decimal or abbreviated dec for short. After F the numbers start over again with 10,11,12,13,etc. The contents of the EPROM are made up entirely of a programming base called hexadecimal or hex for short. Now that you have the basic understanding of our EPROM, the next challenge is to understand how the information is written inside of it. Just remember to look for something between 85 and 45 and youll be okay. The speed is always defined as 2 digits, so an 85 is 85ns, and a 55 is 55ns, but a 20 is actually 200ns and would be far too slow to be used on our ecus. Here is where it gets kinda tricky though. The ECU requires that the EPROM runs at a certain minimum speed which is about 100ns but I feel it is good to keep them as fast as the stock 85ns or faster. 85 is the speed of the EPROM in nanoseconds(ns). The 256 stands for the memory capacity of the EPROM and our particular chip is broken up into 32 segments of 8bits each. The C is for ceramic which is the kind of material the EPROM is made of and also plays role in its performance.
SR20DET 62 ECU DIAGNOSTIC SCREW RUN POSITION SERIES
There are also smaller and larger EPROMS within the 27 series but they do not pertain to us. The 27 determines the basic type of EPROM which in our case is a 28 DIP or 28 dual in-line pin with two rows of 14 pins each. I am going to keep this very basic as we do not need to be programming or emulation experts to be able to make very good custom tunes for our cars.
SR20DET 62 ECU DIAGNOSTIC SCREW RUN POSITION DOWNLOAD
Check ECU download page for the latest downables.īy Devin (Z from Japan) To start off with I will first give you some background information about the Zs EPROM. Petri for contributing the ConZult tracing info.
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Special thanks to all who have contributed in this area: Devin for initiating and writing the ECU tuning info and revision.