Why run SDS (or any other stand alone engine management system for that matter)?
There are several reasons for using SDS. The SDS, or any other stand alone engine management system, provides very precise control of ignition timing and fuel delivery. There is currently no easy way to reprogram the LH2.2 EFI chips. The conundrum is thus: when the limits of the LH2.2 are reached for performance reasons, then one basically hits a wall. While some modified chips are available, they are not readily so. There are also good reasons NOT to use a mere modified chip. Thus, c900 owners are in a situation unlike those drivers of many Japanese marques, which have plug and play ECUs readily available (see the wonderful Apex’i Power-FC for example). For us, the best way around the limitations of the LH2.2 is to install a stand alone engine management system. Running SDS is a more efficient and precise way of making power on the c900. Instead of attempting to trick out the stock EFI to provide more fuel by the hard to come by fuel chip, piggy-back computer or rising rate fuel press
