mhax

I upgraded my fuel injectors on my B18C1 to RDX injectors. I played with AEMTuner a little and found that I can set the injectors to RDX Injectors in the Setup Wizard and that it changes the battery offset. Because the CC is quite higher on the RDX compared to stock injectors, what should I also change before starting the engine?

Rtype16

For starters you can go to the wizards section. Chose the wizard for change injector size. Enter your old injector size at a given pressure and your new injector size at the same pressure. This will scale all the maps to the new injectors. However this will get you close so you will still need to do a little bit of tuning.

mhax

The stock injectors are at 43 psi, and I know that stock RDX are something like 55 psi. Should I change the cc of new injectors at 43 psi or at 55 psi? I know they are rated at 440 cc at 55 psi, but I don't know how they are rated at 43 psi. I'll have to find this info if I have to put the CC change at the same psi.

EDIT

I found this image :

It looks like they are 440 cc at around 44 psi.

Rtype16

Yes change the injector size and pressure for whatever you have the numbers for. So in this case the RDX pressure would be higher.

mhax

I thought I saw the RDX injectors in the setup wizard, but now I can't find it (probably mistaken the RSX injectors for the RDX). So should I leave the injectors to the stock battery offset since the RDX is not in the available injectors? Is there a way to add it to the list?

Rtype16

No way to add it to the list however you can open up the tables and input your battery offsets if you have the numbers.

VegasInvasion

for the record, you'll still probably have to raise the latency on those quite a bit to clean up the low-load and cranking response.

mhax

And where can I change that?

VegasInvasion

Tabs - Trims - Batt Offset Primary

mhax

Oh I thought you were refering to something else when you said latency. The stock batt offset for the 240cc are at 2.5 ms for 6 and 7 volts. How much higher should it be (you were talking about low or high voltages?)?

VegasInvasion

2.5ms at 9 volts maybe, but at 14v I'm pretty sure stock injectors run at like a 0.6ms offset.
I digress, if you're using the RDX offsets you'll probably have to raise the values by another 10% before they start to run right.