can someone tell me where the mass air flow sensor is on an 1800?
Fred,There is no mass air flow (MAF) sensor on the GL1800. The MAP sensor is a Manifold Air Pressure sensor.
I don't know if the ECM in the Wing uses Alpha N or Speed Density to calculate fuel mixture and it's impossible to say for sure without downloaded the ECM and cracking into the code to see. Some manufactures even use a combination of the two methods depending on engine RPM. The MAP sensor output is used in both types of calculations to help derive airflow.
10. Do I still need to run a mass air meter with the XFI™ system?
No. The XFI™ is a speed density system, so it doesn't use a mass air meter. Speed density systems use the manifold pressure and air inlet temperature to calculate the volume of air entering the engine. Speed density allows you to do away with the mass air meter, and it also factors boost into the fuel and timing calculations.
That is the key to it all right there. The Goldwing's ECM is very rudimentary, and it doesn't need to be any more complex than it is. Considering that the 1800 was meeting CARB standards 8 years into the future when it was introduced, there was no need to invest in a complex ECM. The ECM we have probably cost all of $25 to make. A portable CD player has more electronics in it.But for a motorcycle that doesn't need to conform to gov fuel economy mandates or emission controls and has very few power upgrade options, speed density fits the bill perfectly.