350z r33 injector tuning

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Enriquez2000
Posts: 10
Joined: Thu May 30, 2019 1:07 pm

350z r33 injector tuning

Postby Enriquez2000 » Mon Mar 16, 2020 5:49 am

Injectors show base pressure at 43.5 and they run 52. Also shows the flow rate to be around 370 at that 43.5 and losing injector as vaccum declines going into boost.

Is this how we are adding fuel? Or do the injectors really decay flow?

Confused a bit. Hoping for a hair of clarification

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HaltechMatthew
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Re: 350z r33 injector tuning

Postby HaltechMatthew » Mon Mar 16, 2020 2:28 pm

Not sure what you are asking here.

Base pressure setting is for engine protection only and is nothing to do with actual tuning.

350Z run a returnless fuel system. i.e. no vacuum reference to the pressure regulator. So under high vacuum the injector flow is higher because the intake is sucking on the injector tips. Under boost the opposite, boost pressure pushes on the injector tips so flow is lower. As such the injector flow needs to be mapped.

So....
If you put 350Z injectors in your R33, then you have a fixed injector flow. They are around 290cc/min.
If you put R33 injectors in your 350Z then you need to know the flow rate for all different pressures for those injectors to be accurate. Unless you test them you wont know. Guessing will get you close, but even if you dont map it you will just have a skewed looking Fuel Base table.


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