Hondata

Injector dynamics has values for all pressures for the dead times on their website.

For the 1000cc injectors they actually show 1015cc for 43.5 psi so I entered that value for my injector size.

I will be running 50 psi base fuel pressure without the vac line hooked up. I have a manifold referenced fuel pressure regulator btw. Once I set the base pressure I will hook up the vac line obviously. So I set the current pressure to 50, simple enough.

But my question is: Do I use the dead times that ID gives for 43.5 psi or the values that they list for 50 psi since that's what I'm running? I would think the values for 50 psi but since flashpro manager make be making calculations based on a test pressure of 43.5 and I entered 50 psi as current maybe it makes adjustments to the dead times as well?

Lastly, I checked the help contents and it didn't specify but under fuel> and overall trim. If I wanted to richen the entire fuel map 5% do I enter 5 or -5?

Because it says trim that makes me think a positive number will TRIM by that amount. Ya know kinda like when it says retard for timing, a positive value will pull(retard) timing....

I hope I don't regret this....Car is running well and has been but I know the ID injectors are top notch if not the best and I've seen the difference they make in my mustang so I want the same thing so we'll see

Figures supplied by Injector Dynamics for the ID1000s typically need to be increases 0.1 - 0.25 ms in order to work correctly.

We've pointed this out to ID many years ago, and also pointed out that the flow graphs they supplied do not match the table data. We were told the dead times were generated electrically rather than using injector fuel flow. The graph inconsistency was not resolved.

That and about 10 threads on this forum about finding the dead times. So the answer to your question is it doesn't matter if you use times from 43.3psi/3bar or 50 psi, because both dead times will be too low.

Fuel trim is an adjustment. Positive values increase the fuel. (trim. verb. to prepare or adjust)

Ok, thank you for the clarification on the trim.

Ok so .25ms = 250 us(microseconds so I guess I will just add that across the board.

Do the dead times affect the fuel tables or do they just dictate the injector characteristics upon injector cut like in coasting shutoff for decels?

Thank again for your help. I'll try to post back if I find anything useful.....I've never really tuned injector dead times so that will be new....Funny thing is, with my precision 650cc injectors my old tuner never changed or tuned dead times and I think the car runs good.


I still think you should add to the software to change what 1.0 lambda is.....Since most gas available at the pumps is E10 and the stoic is about 14.1-14.3 AFR....I was setting up my base tune last nite and setting the idle target lambda and the way it is 14.7 = 1.0 lambda which most likely is not true anymore. I guess it doesn't really matter what is displayed as long as stft's are near 0. I know you said adding that may only confuse people but I think there is enough other things that can confuse people that don't know what they are doing so I don't know that it matters but it would be a nice feature for the people that do understand tuning.

I'm setting up my wideband interface also and it's out put is programmable for the stoic point of the fuel you are using so I'm thinking that may work well for boosted tuning.

The dead times certainly do affect the fueling, especially at low injector durations.

Yes, the air fuel ratio at stoichiometric for E0 is actually about 14.58 and E10 perhaps 14.1, but in the end it is just a translation of the air-fuel equivalency ratio (or lambda) and the units are arbitrary. The base units are always the equivalency ratio, not air-fuel ratio. If we changed the gasoline air/fuel ratio translation then a lot of tables would need adjusting.