I am working with a “rough” base map I got for my vehicle from ECU tech support as there is very little to no one working with automatic equipped Honda applications with the J series V6 platform. Recently, harness maker Boomslang introduced a “Parallel” harness for the ECUMaster Black ecm for the automatic Hondas that allows tuning of the engine with the Black and leaves transmission and other CAN functions to the oem computer.
The MAP provided is for a J35 (3.5 litre) while my engine is the J30A4 (3.0Litre) but will work on virtually all J series applications once correctly configured and my engine has fuel/intake parts from both J35 and J37’s currently installed, and it is running well with the stock ecm with no tune. So with that in mind I uploaded the MAP and was looking it over and one thing I noticed was the original injectors had been changed to a predefined set. The ones loaded in the MAP are: Atomizers 3 - 225 PPH [@2190ccm]
I cannot find a predefined injector close to what I have to change it to, thus the reason for my post. This is all the information I have for the injectors I have installed:
They are OEM Honda units fitted on various J37 and J35 applications.
Denso’s with OEM PN- 16450-R70-A01 310 cc/min at a fuel pressure of 43.5 psi (3 bar)
The fuel pressure, measured at the rails, is 58psi.
The closest predefined injector, and would be the next step up in size, is the DENSO 0880 827 10 [@3bar@410ccm] used on Acura RDX-Spec vehicles. (OEM - 16450-RWC-A01)
I can remove the Atomizers, but I can only seem to “replace” the ones in the MAP with other predefined ones. How do I do this? Does anyone in the community have any info on the 310 cc OEM units to plug into the MAP? Using a high quality OBDII scan tool I have STFT values of -10 to -15 % which is a tad on the rich side, so I want to try and get as much information onto this base map as possible.
So, I am looking for any suggestions the community has.
You can fill in the deadtime table manually, and that is always my preference. Do you have deadtime data?
If not they can be tested or you can find them from a base map from like Hondata or something oem based. I happen to know there is other brands actively working on the J platform
Also an important note that the wizard will not change the injector flow rate in General settings. That needs to be done as a separate step.
Hello FlooritGarage,
Thanks for your reply. N, I do not have dead time measurements.
Yes I was going to use a base map from Hondata to fill in the gaps on the map I have now.
I was looking to remove the injectors currently in this map, not change any of the values of them.
It seems like I can only choose from other predefined options. What do you do if your injectors are not listed? I might be able to use the 410cc RDX ones I mentioned in my original post if I can change the flow rate. Besides as an OE injector of the same family they may have similar dead times.
What are some methods of determining dead time, and is that considered the same as offset?
What is the process (and in the correct order) of using the wizard to replace the injectors currently in the map?
I was looking to remove the injectors currently in this map, not change any of the values of them
Not sure what you mean by this. EMU is a Volumetric Efficiency model ecu, the injector size and deadtime are just part of the fuel model’s calculation to get to a pulsewidth.
You can just click on a cell and type in a new value, you do not need to use the wizard.
In this video Shane T demonstrates a method to determining injector deadtime. I’ve seen some mixed reviews if this works, I have not tried it myself.
Yes deadtime or voltage offset are the same term in this context.
It’s great having this data, but you can get an engine running without it and seek help from your tuner when you take them the car.
Thank you for your time and the information FloorItGarage, VMA sir.
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