[Supras] injectors to pass NJ emissions

[berniek at technicaldevelop.com]

Hi List.

    Trying to get my JDM rebuild completed, and thinking about installing Lex AFM and 550cc injectors at the same time as engine installation to avoid disassemly later.  Arlene swears by Greddy injectors and says they are built with two discharge holes each, to provide the two fuel streams needed in a four valve per cylinder engine.  However, she also says that many MkIII owners have successfully used RC disc injectors.  One of the problems is that NJ emissions tests are very strict, using a chassis dyno for pre-OBDII cars.  For those who are electronics minded there appears to be a simple way to beef up the ECU to allow opening of stock 440cc injectors at 60 PSI, allowing the same flow as 550s at stock pressure.  Arlene expressed concern about the spray pattern, however.  

    I had an interchange with Chris Smyczek, in which he stated that the way to go is to change to a speed density system using a MAFT-PRO.  I checked their website, and they also make a MAFT which uses the GM hot wire AFM.  Time to do extensive map building with a laptop is limited, which inclines me to go in that direction, if the LEX AFM pressure drop is excessive as many seem to indicate.  I guess the major concern aside from spending days getting the tuning right with a speed density system is the tolerance of the system to allow a reasonable range for stoichiometric correction by the O2 sensor to pass inspection (light load operation).

    Any comments and ideas would be appreciated.  Thanks.

        BernieK