injector sizing

ARTHUR OKUN arthurok at ix.netcom.com
Sat Sep 30 08:36:09 GMT 1995


You wrote: 
>
>~ 
>~ 
>~ Hi.  I'm new to the EFI list.  Excuse me if these questions
>~ are exhausted:
>~ 
>~ I have a '84 928S with L-Jetronic.  I'm interested in increasing
>~ performance, but my budget will allow only one step at a time.
>~ 
>~ Before I add a hot cam, can I oversize my injectors without
>~ any negative effects?  I think stock is 19 lb/hr, and I'd like
>~ 25 - 30 lb/hr.  I would think that open-loop mode would run
>~ too rich; if I'm right, can it be adjusted on L-Jet?
>~ 
>You may be able to screw with the supply pressure.  The 
>square root of the ratio of the fuel pressures equals the
>ratio of the injector flows.
>
>- Bruce
>
>
>--
>-----------------------------------------------------
><<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>-----------------------------------------------------
>               Bruce A. Bowling
>  Staff Scientist - Instrumentation and Controls
> The Continuous Electron Beam Accelerator Facility
>    12000 Jefferson Ave - Newport News, VA 23602
>                 (804) 249-7240
>                bowling at cebaf.gov  
>        http://devserve.cebaf.gov/~bowling
>-----------------------------------------------------
><<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>-----------------------------------------------------
>
YOU MIGHT FIND LIKE I HAVE THAT FIXING OR REPLACING OUT OF SPEC.
COMPONENTS LIKE MAF'S AND TEMP AND VAC TRANSDUCERS  ETC.
CAN MAKE A GREAT IMPROVEMENT IN AN ELECTRONICALY CONTROLLED ENGINE
SOME TIMES EVEN THOUGH THE BAD PART DOSENT GENERATE AN ERROR CODE
LIKE ON THE DOMESTICS IT CAN BE ENOUGH OUT OF SPEC.
TO CAUSE A VERY NOTICABLE REDUCTION IN PREFORMANCE




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