Ever get anywhere with this?
Then you need to increase the pilot pulse to get it over 250uS and your Rattle will be reduced
When you increase pilot qty you essentially shorten the time between end of pilot and beginning of main. I've done this and yes it works, but you can do the same thing by decreasing pilot timing, and use less fuel at the same time. Thats what I'm doing and there is no rattle at all.
Partially right but mostly incorrect...
Unless you modify the pilot to main "limiter" your not changing anything in regards to "shortening" the time between pilot and main...your mentioned way is simply giving pilot less time to fully burn. While it may reduce your rattle, the way I mention is much simpler and adding 25uS is hardly increasing your fuel consumption.
Two different ways of doing things.
On a second note, when you remove pilot the ecm will automatically increase commanded main duration to compensate and maintain desired rpm. You really do not save much if any fuel by removing the pilot pulse. Shortening the time between shots can actually be detrimental to economy as it shortens the dwell time. In general more timing of either event will give more time for the air/fuel mixture to develop and results in a more economical burn. This of course has its limits as you can put too much dwell time between shots and advance the total injection event too far and reach the desired mixture rate before the point of auto ignition which in turn can cause fuel droplets to form on the piston and cylinder walls resulting in poor combustion known as "wet stacking" or early detonation (high cylinder pressures).
I could be misreading, but I think Les is saying your low pilot qty might not actually be burning. And THAT is wasted fuel.
Have you tried doing it his way? Or just don't think it'll work?
And if turning pilot off gets so much better MPG, why not kill it and deal with the noise?
On a second note, when you remove pilot the ecm will automatically increase commanded main duration to compensate and maintain desired rpm. You really do not save much if any fuel by removing the pilot pulse. Shortening the time between shots can actually be detrimental to economy as it shortens the dwell time. In general more timing of either event will give more time for the air/fuel mixture to develop and results in a more economical burn. This of course has its limits as you can put too much dwell time between shots and advance the total injection event too far and reach the desired mixture rate before the point of auto ignition which in turn can cause fuel droplets to form on the piston and cylinder walls resulting in poor combustion known as "wet stacking" or early detonation (high cylinder pressures).
Curious but did you ever look closely at the logs between pilot and no pilot. On mine I would run in the 45-55mm3 with pilot and with no pilot I was consistently between 30-45mm3. That looks to me like less fuel/duration. I don't think the ECM cares, it is just commanding what ever is in the tables that keeps you at 60mph.
All that matters is the us that was being commanded, mm3 is just a reference. I'm not being condescending just trying to make sure no one gets confused here.