Took part in this photoshoot with 102 other Z’s this August. It was great to finally get the Z back on the road after a 120k service and injector replacement. I swapped in a set of new style 370cc injectors after having an old-style 555cc fail. I’ll be upgrading back to larger injectors in the future, but for now wanted to get some solid data logs of how stock injectors behave in regards to wall-wetting, acceleration enrichment, O2 feedback, idle and the dozens of engine load (TP) based ECU parameters that are incorrectly tuned in the currently available chip ‘upgrades’ from the big names in Z32 tuning.
When tuning for upgrade injectors, Z32 tuners adjust the injector ‘K’ constant, which requires all of these TP parameters to be adjusted, and unfortunately they miss quite a lot of them. This was my primary motivation for the first release of KnockSpy; to help tuners understand what TP parameters they were missing for the knock control system in their tunes, which were causing the ECU to disable knock control under high load and high rpm.
I’ve been developing and testing a big injector chip upgrade since 2016 that keeps the stock injector ‘K’ constant and instead uses an injector scaling parameter. This allows for the TP parameters to all stay the same and avoids any issues with incorrect engine load parameters.
