Hmm, interesting. Didn't realise anyone was still using multiple injectors as standard. Haven't kept up with the bike scene for several years now....
But, if they are there already, then fair enough its easier to keep them then try to blank them off.
I figured staged would allow smoother progression at the bottom of the rev range (I could be completly wrong)
No, you are completely correct
, and this will be the way they're controlled by the standard ECU. As I recall most of the early fuel injected bikes got slated for the tip in response being nasty (tip in shunt), which was most likely caused by the injectors having to go from overrun fuel cut and come back in. Injectors have a minimum pulsewidth at which they reliably deliver fuel, which means when you switch them on you get a small 'kick' or shunt as the bike goes from negative to positive torque. In the OEM car world we get around it by retarding the spark at the point the injectors cut in to smooth the torque transition. I guess Suzuki have got round it by running staged injection so that the minimum pulsewidth cn be reducd, helping to reduce that step in torque.
As for staging them, rather than by speed you should ideally control by required flow, i.e. use the primary injectors up to a certain flow requirement, which could be high speed low load, or could be high load low speed, and then start running the secondaries after that. Not sure if thats possible with VEMS or not? (One for Rob I think
) Primary injectors shoud ideally be fully sequential, but secondaries would normally be less important, as they would be installed much further up the inlet giving plenty of mixiing and vapourisaion time. However, if they are in basically the same loaction as the primaries on your TB;s. then it would be good to keep them sequential too, or at least semi sequential.
Got any pics of the TB's? I'd be interested to see them
