Hey does anyone have any information they could share on the Injector Atomization Pipe, (its the yellow tube located inbetween the Front Secondary injector and the Front OMP Injector Nozzles on the diagram)

How important is this line, and has anyone found any difference in a blocked VS operational configuration?
How have you dealt with this item in a single turbo configuration?
Simply vent to atmosphere with a small filter/breather?
Or is it advisable for any reason to pipe back to the turbo inlet?

How does it operate correctly under boost if there is no check valve?

Has anyone been able to find information in the FSM on this item, I may be looking in the wrong place but I have not found it there as of yet, or even if this is its official name.
Or perhaps are there any terms that lead to a discussion on the topic, or even good threads someone could lead me to?

TIA

 

Basically every fuel injected rotary, turbo and non turbo, from the 12A turbo and early 6 port non turbo 13B all the way to the 13B-REW used this configuration. It is an air bleed + mixing plate to improve the spray pattern and atomization. Air bleeds in general trace their roots back to carbs. The older style fuel injectors did not have a great spray pattern. On the Renesis, Mazda switched to newer multi-hole injectors and an enhanced version of the air bleed call the Jet Air Mixing System. The air flows along the floor of the intake port to further improve atomization.

Besides increasing HC emissions, when the line is blocked there is a good chance you will have a richer idle. You can block it off, and plenty of people do that, but it doesn't really accomplish much besides saving you one hose.

I've never opened it straight to atmosphere but I think others have. Just hook it anywhere before the throttle plates. It should not see manifold vacuum.

It never sees manifold vacuum. It sees atmospheric pressure or boost. On the 2nd gen turbo engines it was actually hooked up to a port on the back of the UIM which draws air from before the throttle plates.

I know this is really obscure but it is discussed in the service highlights manual for the series 3 GSL-SE engines.



The Jet air mixing system is discussed in Mazda's SAE paper on the Renesis.

 

now i feel like an idiot, i always thought it was the aqua colored line for the mixing plates when doing emissions removal. guess i should have paid more attention.

oh well, the difference when hooked up and not isn't even noticable in most cases anyways.

 

deleting message.

 

You can't vent it as it would be a vac leak.

Just put it before the throttle body and after the turbo (like in stock location).

Under load it does nothing but when the butterflies are closed it directs air to the injectors helping it atomize.

for all extensive purposes it just bypasses the throttle body during idle............ that's it - so it's not a boost leak since it is a closed system and no check valves etc needed.

Same concept as the idle air adjust screw except this air is direct right at the injector to atomize better.

 

OK, ya, I got it stuck in my head it was supposed to be located at the front of the turbo inlet despite the schematic (probably because of the OMP injectors I guess)

Sorry for the confusion.

 

So this is interesting. I knew some Hondas used injector atomization ports but I didn't know Toyota used it as well. Apparently California spec 2JZ-GE engines had it:

 

If the atomization pipe is vented to atmosphere, wouldn't it actually reverse the flow of the injected air due to boost? The pressure inside the intake port would be higher than that of the air bleed, and it seems that some air (I don't know how much) would be pushed out of the injector cup area, which would then include fuel.

Has anyone ever hooked this up wrong and seen a difference in engine performance under boost?

 

Yes it is currently spraying air fuel premix mixture all over my engine bay. On a dyno pushing 20lbs of boost, its like a dark cloud going everywhere.

 

In my experience it does help idle quality a bit if using 850cc primaries, if using modern ev14 primaries with better spray and low duty cycle performance its not as important.

 

Resurrecting this post. Following up on the last msg above, is it confirmed that connecting this vacuum line does nothing if you're running, say, newer injector dynamic style injectors? Would newer style injectors just block the air pathway by the injector nozzle or is there still an open airway beyond the injector nozzle and therefore you still need to plug the nipple on the lim?

 

don’t plug it or put a vacuum to it, it’s a boost only port. You would T off of the waste gate pressure line that comes right from the turbine housing.

 

Hmm, interesting idea. Would that impact the responsiveness of waste gate control? I guess probably not because on boost there would be no pressure difference and at closed or near closed throttle you're not trying to control boost anyway. Probably the main risk is that you introduce a new failure point that could lead to over boosting.