Originally Posted by
Jabbott
Let me explain it like this, the way you are doing it is not exactly wrong, but it is also not right. You could take temps at different points and do a sanity test, example my IAT temp says 90 degrees but its 70 ambient. So this would be a 20 degree difference that you could change in the box. But when you start the car you do not know how much temp is changing from the heat effect of the intake. So you would have to do sanity tests at all those different temps from -40 through 284 in order to make your curve correct. So you say you don't need them, well I live in VA and I have a temp spread between 25 degrees and 100+ degree during the year. It makes a huge difference, the IAT temp is used in calculating fuel so it really needs to be spot on. The easier way would be for you to find a file for a LS3 or LS7 and copy the IAT transfer function and past it into your E40 and your done. The LS1B ecu is not as easy but just as important for it to be done correctly.