I've just received and fitted the Denso 12-hole injectors as supplied by dimarmotorsportsllc on eBay (shipped from the USA). Fitting was straightforward and they came with plug-and-play adaptors as promised. I took some photos of the existing injectors (black), which are a 4-hole item, and the new injectors (green). The stem of the new injectors reaches further into the engine than the previous ones, and if the holes are what make the spray of fuel, 12 little ones have to result in a finer, burnier mist than the 4 larger holes. I can only imagine what a single giant hole would do...
Comparison of 4 vs 12 holes: https://photos.app.goo.gl/8CvAbTdeJa7YKeEx5
Previous (black) vs new (green): https://photos.app.goo.gl/MtXJsLqGqxmdRziM8
After removal, before installation: https://photos.app.goo.gl/BEgmc6NNQkS8WHhe7
I'm curious as to what the black 4-hole injectors are. There's no recognisable brand on them.
I've got a DNA air filter to pop in, after the appropriate silicon application of the little rubber blanking stick for where the butterfly actuator cable used to go. Then I can throw the tank back on and see how it goes. The plan is to do all this stuff, then get it turned at a dyno, although I have a set of Tune ECU cables on the way from StingerWolf so I can do some of the simpler stuff, like resetting the TPS position.
Thanks for such a useful forum! T