Here are a few shots from the injector installation. As I said the injectors and fuel rail came from a Honda CBR600RR and are actually the set of injectors that are mounted on the CBR's airbox (CBR600RR incorporates HONDA's DSFI -Dual Stage Fuel Injection). The fuel rail was modified in order to fit in the airbox. Basically I cut down in length as much as possible and drilled two holes (between injectors 1-2 and 3-4) to attach new fuel inlet and outlet. Then the whole assembly mounted inside the stock airbox on the trumpet air intake. See photos below:
To be honest I had no idea if this was going to work but since it all came down to experimenting I thought I'd give it a try. It is obvious that proper air flow is a thing of the past with this arrangement but until now no negative effects have been observed. Also note that the Microsquirt ECU and the wideband controller are also placed inside the airbox
(at the upper part above the air filter). It was the only place I could place these without having them hanging or exposed. But I am afraid I have reduced the airbox volume quite a bit...
But as I said, until now in the first few test runs the bike is running well.
Using the MS injector test mode I measured the injectors flow rate at about 80 cc/min at approx 15psi. According to MS online manual and calculator it is a good sizing for the bandit's 59HP motor. Maybe a bit on the less side according to paper calculations but hey, my loyal servant is now 22 years old. Think that some of its 59 horses may have retired...
For throttle boddies and iar induction I used the bikes assembly of carburetors. The suzuki bandit uses 4x MIKUNI BST33 CV type carburetors. On CV type carburetors the slide and jet needle are not controlled directly from the throttle. These are controlled indirectly from the engine -depending on its load- through a diaphragm/slide/needle assembly. The throttle is connected to a butterfly same as a usual throttle body. So why look for a TB? It is allready there! Simply remove the diaphragm and slide and here you go with a nice TB. I might as well add that removing the diaphragm and slide may not be necessary. Actually the very first injected start up of the engine took place with the slides installed. I removed these to give fuel a clear path to the intake.After tuning is completed I will put them back on and see what happens.
So this is my batch/port hybrid injection setup. When I first started the project, its purpose was more experimental and less of practical use. Back then I said that if engine runs continuously for 30"then project will be succesfull. Today at this point I cannot even remember when it was the last time I heard the engine idling so smooth and sweet. It seems that the bandit may see even more glorious days!!!
