Sequential to Batch fire ?
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AFAIC there isn't nearly enough evidence there to prove that the increased DC had anything at all to do with the rising AFR. It's too late now to adjust the test, but a specific test would be in order for that.
You should be able to push the test well over 100% DC to see what happens
You should be able to push the test well over 100% DC to see what happens
Notice the available time to open the injector, and the actual time open, and see that there is no more time available to open the injector.
If you look at it from a perspective of Injector Pulse Width versus Rpm, there is no such thing as anything over 100%IDC.
If as people report that if they go from 100% top 120% IDC as reported in Scanning software and the mixture goes richer, the 100% reported in the scanning software can't be an accurate 100%, so you need to find the true 100% IDC.
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Injector PW dropping after max VE would also explain the AFR going lean.
A drop in fuel pressure would also explain the AFR going lean.
A significant increase in chamber temperature would also explain the AFR going lean.
A high speed misfire would also explain the AFR going lean.
IMO you'd have to richen up that area in the tune to a very high degree and then record what happens to the AFR. It would also need to be repeatable on another vehicle.
The chance of the software misreporting the DC is definately a possibility, but would lead one to think that the reported PW is higher than the actual PW at the injector.
A drop in fuel pressure would also explain the AFR going lean.
A significant increase in chamber temperature would also explain the AFR going lean.
A high speed misfire would also explain the AFR going lean.
IMO you'd have to richen up that area in the tune to a very high degree and then record what happens to the AFR. It would also need to be repeatable on another vehicle.
The chance of the software misreporting the DC is definately a possibility, but would lead one to think that the reported PW is higher than the actual PW at the injector.
Teching In
Joined: Jan 2006
Posts: 9
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Injector PW dropping after max VE would also explain the AFR going lean.
A drop in fuel pressure would also explain the AFR going lean.
A significant increase in chamber temperature would also explain the AFR going lean.
A high speed misfire would also explain the AFR going lean.
IMO you'd have to richen up that area in the tune to a very high degree and then record what happens to the AFR. It would also need to be repeatable on another vehicle.
The chance of the software misreporting the DC is definately a possibility, but would lead one to think that the reported PW is higher than the actual PW at the injector.
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From: Fairview Heights Illinois
Originally Posted by awddynotodd
As stated, the injectors could not be opened any more, but I'm sure if it had more fuel pressure, it would have a better AFR. I have access to many more examples of this happening, so it is by no way a one off occurence. I'll see if I can get my hands on some single turbo or blower LS1 examples next week to show it can be on any sort of vehicle.
Looking for only examples that support a theory is false science. That wouldn't show repeatability on other cars at all. Don't bother showing more examples of the same thing with inconclusive situations.
Why is it that your software will not command higher PW numbers?
I've never seen a system that will not do this.
