Throttle Plate Control

[Joe Senner]

]>I'm surprised that with an EFI system that people wouldn't consider 
]>cutting fuel rather than spark.  Of course hysteresis as mentioned above 
]>would be a must.  I would guess with too little or no hysteresis, that a 
]>really lean condidtion may occur as the computer would kind of half 
]>heartedly feed fuel right around the rev limit.
]
]>Has anyone out there played with cutting fuel rather than spark?  If no 
]>one uses this method, why not?
]
]I think it is better to ignite later, than cutting off the fuel, in that way 
]the engine is not able to raise its r.p.m, while getting sufficient cooling 
]from the  incoming petrol

jumping in a little late here, but my BMW (from all the explanations I've
gotten) cuts fuel supply by 50% 500rpm below rev limit, and then cuts it
100% at rev limit. it also cuts fuel supply on trailing throttle. oddly
enough (and I've seen this one played out on the CO meter) it enrichens the
mixture by quite a bit to control overheating.

I can't verify this is all correct, but hopefully I'll be able to after a
bit (when Jim Conforti gets through with his handywork :-)

-- 
Joe Senner
http://www.onr.com/user/joe.html