Volkswagen ecu flashing
![volkswagen ecu flashing volkswagen ecu flashing](https://www.vrtuned.com//images/vrtuned-benchflash.jpg)
I'm waiting until I get a wideband o2 to tune the fuel map. With my nistune on my 240sx I've done a little timing increase (4 degrees) and it makes a pretty big difference. They also crank up the timing which is why you have to run high octane fuel. Tuners almost always lean out the a/f ratio in some rpm's ranges (crusing) and richen them in others (hard acceleration.) If I remember right ~12.5:1 is best for power but ~17:1 is best for emissions. Stock programs also run slower timing then possible to help prevent knock. Stock programs run too lean or too rich in areas because the best a/f ratio for emissions isn't the best one for power, and richer is safer because it prevents knock. The pulse-width of the fuel injector is meant to keep the air/fuel ratio at a targeted ratio.
![volkswagen ecu flashing volkswagen ecu flashing](https://www.vividracing.com/wm.php/images/VRT-GTI-DYNO-1.jpg)
The ignition map is how many degrees before top dead center to fire the spark. The fuel map values are normally the pulse width of the fuel injector(s). The ecu looks at the RPM of the engine and the load and then gets the value from the specific block on the graph/map.
![volkswagen ecu flashing volkswagen ecu flashing](https://i.ebayimg.com/images/g/uMoAAOSwPHZaxwUM/s-l400.jpg)
One of the axis is the engine RPM and the other is the engine LOAD (as measured by TPS/MAF/MAP etc.) So the maps are like a graph with a y axis and a x axis. Newer ones have a VE map but that's out of the scope of this message, and I don't think tuners modify them much if at all. Older cars just have an ignition map and a fuel map. The ECU contains "maps" aka "charts" aka "graphs" aka alot of other things. I've also read and throughly understand this book: I have this product for my 240sx which is my 2nd car and I've even done a little bit of tuning.
Volkswagen ecu flashing professional#
I'm not a professional but I know alot about engine management (or I think I do.) Why the need for a filter on a stick? Stock airbox appears to be something that GIAC suggests shouldn't be used with their programs. How do ecu reflash programs work? Specifically, how do they affect the fuel injection or air intake or valve function to increase power?