Yeah...it does go down in that rpm area at cruise.....mine goes to 1.536.

 

^ ve ftw

 

I spoke with Jens @ JIC about this and he states that the stock value of should suffice in almost all conditions.

His recommendations seem to go more towards voltage stabilization and even higher voltage for the fat low impedance style injectors as a method of stabilization of the injector. More voltage creates a stronger magnetic field inside the injector therefore affecting flow characteristics positively.

For me, I don't need to change anything when it comes to minimum IPW.

Now the ability to have smaller steps between IPW for various rpm/load conditions (i.e. resolution) would certainly prove worth while in the smoothness of drivability. Just a thought.

 

True IPW step size is 1usec.

If you are only logging the normal IPW, you'll see a step size of 255usec but that is just because the 2nd byte is being trunicated.

 

Yep....that is exactly what I see.

 

Yeah, actual IPW varies by MUCH less then 255usec. Actual step size may not be 1usec, but it would come down to the actual calculations as it has the capability, at least with the memory variable to go down to 1usec.

If the drivers or injector can reliably do 1usec difference is a whole different topic anyway.

 

step size is 8/1000 ms

 

Does anybody know if the standard 1 byte IPW is actual IPW that the injector sees or uncorrected (before latency addition) IPW.

 

1) the standard 1 byte is JUST the high byte of the 2byte IPW

2) it's post corrected ie after latency as been added.

 

If thats the case than ID1000's can be ran down to ~0.25ms.
http://www.injectordynamics.com/ID1000.html

ID2000's can be ran down to ~0.5ms.
http://www.injectordynamics.com/ID2000.html

Be sure to reference the *corrected* flow vs IPW charts.

 

yes - but look at the deviation graph for sub 1.1ms for the 2000's...

 

The deviation percent looks bad because you are dealing with such a low IPW to begin with. The corrected flow vs IPW looks solid, meaning you will achieve reliable opening at low IPW down to abut ~0.5ms. The fuel trims will sort it out from there.

 

Compare to this:
http://site.titanmotorsports.com/blo...ctor-graph.jpg


We tune around non linearities all the time. Many people non linearize the factory MAF when they take off the stock airbox and put a cone filter on. As long as the IPW is repeatable and reliable (precise) then we can work with it. We don't always have, nor do we need precision (linearity to 0ms). I hope that makes sense?

 

While that hypothesis may be true on paper, real world testing says otherwise... at 1.04 the high z 2000cc start to sputter a bit...

 

My ID2000's are not sputtering down to 1ms.