Join Date: May 2004
Location: Great White North
The lambda being referred is basically the provision for an O2 sensor input. Some ECU's, for example the ones used in modern cars are closed loop fuel injection, meaning that the O2 sensor measures the air fuel mixture realtime and adjusts accordingly. With emissions controls and standards, bikes will all be closed-loop EFI systems in the not so distant future I think. I think the suggestion is whether the race ECU can receive an input from an O2 sensor and operate in a self-calibration closed loop mode.
The Race ECU allows programmability and adjustments to just about every electronically governed engine parameter, including fueling and ignition timing. It can also do away with many of the "street" bike systems of the bike such as control of the secondary throttle plates, the timing retard in the lower gears, exhaust valve servo removal, and increasing the rev limiter.
I was at a dyno day a couple years back, and a local sponsored racer swapped his regular ECU with a race ECU and ran back to back runs. Now the race ECU was unmapped and unprogrammed. Back to back dyno runs yielded a 4-5hp difference. On his ZX6RR he picked up a phenomenal 9hp!
Last edited by Rspec99; 07-19-2007 at 02:34 AM.