Alfa Romeo/Alfa Romeo Digest Archive
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SPICA-ness
Greg Hermann said:
<<And--if you want still better fuel atomization than stock, try setting the
injector opening pressure up a bunch higher!
Another thing to pay serious attention to-- in order to equalize fuel
delivery to the cylinders--is having equal length high pressure fuel tubes!
Especially if you are tweaking the injector opening pressure, the deflection
of the tubes AND the compressibility of the fuel are BOTH very significant
factors.
OK--higher pressure, better atomization. Equalized fuel flow. Goth go
directly to better performance. Great! What to do about the metering
problem??
How bout using (easily available) a linear actuator (with position
feedback, preferably) to position the rack in the Spica pump--and
controlling said actuator with a modern ecu brain, with all of the usual
inputs--MAP, engine speed, MAT, throttle position, coolant temp, altitude,
etc. to set the proper fuel delivery for any given set of engine operating
conditions. If one combined this approach with feedback from a quality wide
band O2 sensor AND an EGT probe (or probes), I think one might well have a
system which would be easily capable of seriously outperforming a system
using electromagnetic injectors!!!>>
OK, OK, OK...my head is now spinning (with anticipatory delight,
mostly)..Greg...can ya expand on this or at least point me in the direction
of where add'l details along these lines may be found...in a practical
framework to apply all this to a 2.0?
Oh, and as an Alfa sophomore...I'll gladly sit and read whatever comments
anybody with more experience (not too terribly difficult) on matters of
SPICA vs. Webers/Dell'Ortos...so please don't hold back.
- -Joe in reasonably sunny SoFla, currently between Alfae, but lookin'
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