TILLEYS99

iTrader: (4)

does anyone know if theres a difference between stock max inj. and 300zx TT and 300zx NA. If you know their specs please post I have a set of 300zx TT injectors and Im wondering if they will work.

QikEnuf

The TT injectors flow more than the NA I do know that, but what it is I am not sure, I had a NA 300 a few years ago and was going to replace the NA injectors with the TT ones. Check out www.twinturbo.net for further info on the injectors.

Weasel

iTrader: (2)

Why?

The stock injectors will work just fine unless you're running boost or above a 50-shot of nitrous.

Frezny

Somebody correct me if I'm wrong (wouldn't be the first time) but a larger injector isn't going to give you much of anything other than a lower MPG. The only time you want to increase your injector size and/or fuel pump is when you are running some sort of forced induction. O2 is the real power maker in the engine. Gas, while needed in the mixture, acts as a regulating coolant and keeps the cylinder at a tempurature that will reduce predetonation. I'm sure something I said got screwed up, but that's the basic Idea.

bosco500

I was told by a Nissan tech that NO injector is compatible with the Maxima. Just curious if anyone here is actually using the z injectors?

Jeff92se

iTrader: (82)

The TT injectors will flow more. But the question is do you need it? And will it actually help? If you are na, then forget it. The stock injectors will have plenty of flow for whatever na mods you bolt on. Even the supercharged maximas are still running the stock injectors fine.

Okay let's look at if you actually put in larger injectors without any other mods. Remember the ecu sends injector pulse-width signals to the injectors to regulate fuel. It assumes you have an injector that flows xxxx per pulse-width. The ecu doesn't know what rate injectors you are putting in(unless you reprogram the ecu for the new injector flow rates)
Cold start mode. The ecu runs a pre-programed(closed loop) fuel map for cold engine running. This means that the ecu sends a pre-determined pulse-width injector rate to control the fuel delivery. If you put an injector that flows xxx more per pulse-width, then you are suddenly sending more(ie.. too much) fuel into the engine. Emissions will really soar, the car might run like crap and you will probably have to fight fouled plugs. Remember in cold start, the o2 sensors etc.. are not involved. Everything is pre-programed until the car reaches operating temp.
Now let's say we are in closed loop(operating temp) and all the other sensors are involved for the ecu to read. Larger injectors might actually run okay in some situations. I believe the 02 sensor will start pulling back the pulse-widths until the fuel ratios are okay. You could probably use a safc to regulate fuel(but you will probably be leaning out the mixes all the time) But remember, larger injectors might not want to have accurate fuel deliveries at low rpm or idle. Idle quality and part throttle running might suffer.