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Injector Latency

Birnie

By Birnie,
in Engines & Forced Induction

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Birnie Veteran

Birnie

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Does someone know what the Latency Setting is for, as in, what it affects in performance if you get the value incorrect?

Are there dangers, loss of power, emmisions etc???

Reason I'm asking is I've just installed s15, 450cc injectors.

I have them in and running perfectly but i can use 2 different setting on the Latency correction and to me, it seems to be exactly the same (Power FC settings)

I've used :

+ 0.12 and

- 0.06

Negative 0.06 i think is correct using the calculation method in the FC FAQ (thanks Paul!) but i also tried Positive 0.12 as someone more experienced than me already had these little babies in and running on that setting.

Any info appreciated :P

(......and if you're interested in s15 injectors and how they're going, there's another thread in here, probably 5-6 posts away about the info and install)

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https://www.sau.com.au/forums/topic/166461-injector-latency/
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mattymagoo22 Community Regular

mattymagoo22

Posted
Posted

hey mate i'm pretty sure that the latency is the time it takes to operate the injector ie time its switched on to the time its actually open fully, there will be some lag hence the need for the settings. you could probably have them way out and it may not matter.....? might give it a try.....

as long as you've got the percentages right thats the main thing so it doesn't chuck in too much fuel, it should be ok

Birnie Veteran

Birnie

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From the Motec site :

Injector Dead Time

Injector dead time refers to the LATENCY of the injector in producing maximum flow rate. All injectors require a certain amount of time to open completely and produce maximum flow. The amount of time is dependant on several variables including; fuel pressure, battery voltage and physical characteristics of the injectors themselves. Typically higher fuel pressure or lower battery voltage tends to increase the dead time. This leads to a reduction in fuel flow in to the engine and as a result influences the engine's state of tune.

GeeTR Grand Master

GeeTR

Posted
Posted (edited)

Hey There,

Sounds familiar =) >> http://www.skylinesaustralia.com/forums/in...=161243&hl=

You'll find its old latency minus new latency... thats the figure you put in.

From what i figure, apart from a setting that might be easier on the ECU, Inj drivers, or coils.... the setting has really little effect.

Batch firing, fires most of the injectors at the back of a closed inlet valve, whole 360' OUT... let alone a handful of milliseconds.

I'm of the belief, it doesn't matter so much.

Cheers

Edited by GeeTR

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