Hey i am looking at upgrading my 300zx with some t28's and injectors, although would like to one day upgrade to bigger turbos. Was wondering if i upgrade my injectors to say 700cc or higher for future turbos to save doing it twice will it effect the t28's, or should i stick with smaller injectors and upgrade them later? Thanks for help.
Just get the big injectors straight up. You will have to get ur ecu socketed and a new tune so that u can run them. Regards Trev
go the big sprayers. 740s or 555's depending on your power levels. you may want 2 go 2 a 300 degree fuel rail http://www.specialtyz.com/fuel.htm
You can run larger injectors even with stock turbos. 555's are a good injector to use for power levels under 400RWKW.
If you know what hp your after there's an easy way to calculate what injector size you might need. Example. 555cc to horsepower at 100% duty cycle per injector, around 90% duty cycle is normal. 555cc divide by 5 = 111hp - 10% = 99.9hp x 6, number of injectors = 599.4hp @ 43psi this assumes all injectors flow the same fuel volume. There are other more involved ways to do the calculation, but it ends up the
Dont go too big if you want a car that will idle and run at low rpm well. should still have good smooth low rpm and idle with injectors 750cc and less. providing the tune is good. After this the idle etc will be rougher. 1000cc will give plenty of smooth power with higher rpm and with all the required mods. engine/ turbo. Personally save your money and get the injectors when you upgrade your turbos. New injectors now = labour and dyno/tune time then turbos later = labour and dyno/ tune time. you will save yourself $5-600 if you do it together. Simplly doing the injectors with stock turbos will not be much of an improvement., and that will be more of the effect of simply improving your base timing than the injectorse IMO
Nismo 555 Are a good upgrade, and probably the easiest as they are a direct swap (can use standard collars).
No collars anyway Jono, pretty sure the Sard injectors are the only ones that use them and even still, that is only with the series 1/2 fuel rail.
