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  1. All of them.

    All of them.
  2. Can anyone explain to me why the starter checks...

    Can anyone explain to me why the starter checks affect VATS? Or the clutch checks?
  3. VATS Delete - Let's cover it all in one thread.

    I'm trying to make sure I fully understand everything there is about VATS deletes, so bear with me and please help only if you are 110% sure you know the answers. This one's probably best left to the...
  4. And for fun, I did a little paint work to show...

    And for fun, I did a little paint work to show the crank sensor pattern off better. The PCM detects piston position by seeing where the engine is in it's rotation. It's easier for it to determine...
  5. I decided to check mine against this, just to see...

    I decided to check mine against this, just to see if my cam and crank line up the same way this capture from Autonerdz had it. It did. The trailing edge of the 4th narrow crank pulse lines up...
  6. The start of injection definitely gets...

    The start of injection definitely gets back-calculated from EOIT. But now that you mention it, in all those tests I did, I was looking to see how Boundary and Normal affected EOIT, and proved that...
  7. I still don't know where you're getting these...

    I still don't know where you're getting these numbers from. We're measuring End of Injection here, not beginning. At WOT, the EOIT is somewhere near BDC on the intake stroke.

    GM sprays fuel on the...
  8. I'm not sure where you're getting your numbers...

    I'm not sure where you're getting your numbers from, but that's not exactly what I said. First off, the stock injector duty cycle that most OEMs are going to shoot for is likely to be 80 to 85%....
  9. A stock LS1. The cam sensor would switch from...

    A stock LS1. The cam sensor would switch from high to low just a couple degrees before TDC. There was a little variance, I assume because of timing chain slack, etc at idle. Pretty freshly rebuilt...
  10. A stock cam at idle has virtually no overlap. So...

    A stock cam at idle has virtually no overlap. So GM is not worried about the exhaust valve's role in this. We do worry about that with aftermarket cams, because we have lots of duration and overlap....
  11. Can an x7F error be caused by unsupported...

    Can an x7F error be caused by unsupported vehicles too?
  12. Whatever became of this? What was the issue?

    Whatever became of this? What was the issue?
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    Just curious whatever became of this. What caused...

    Just curious whatever became of this. What caused it?
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    These are the stock injectors on all 01-07 (maybe...

    These are the stock injectors on all 01-07 (maybe 99-07) Chevy LS truck engines, 4.8, 5.3, 6.0. You can open up tunes from the repository, and compare them to what injector came in that truck...
  15. Forgive me, but can you base this on something...

    Forgive me, but can you base this on something other than theory? GM is not likely to use round odd numbers.
  16. So how can you have eight 65 degree periods in a...

    So how can you have eight 65 degree periods in a 720 degree cycle? We're gonna need a little more than a proclamation here.
  17. How did you come up with that?

    How did you come up with that?
  18. That is typically how it goes. The crank and cam...

    That is typically how it goes. The crank and cam sensors are made, with their teeth placement in certain spots for a reason. Since fuel injection and spark are both based on these cam and crank...
  19. That's a good explanation. I buy it.

    That's a good explanation. I buy it.
  20. I think you're about right. 0 is TDC compression,...

    I think you're about right. 0 is TDC compression, 360 is TDC exhaust (4.0), and 0/720 is TDC compression again (8.0), assuming each reference period is 90 degrees. That 90 is such a big number that I...
  21. It's been a long time, but now I remember that...

    It's been a long time, but now I remember that Bluecat's post is where I got my initial understanding of how this all works. He did some pretty solid testing, but that -784+normal formula of his just...
  22. You would increase the numbers to increase the...

    You would increase the numbers to increase the injector delay. Makeup refers to some pulses that are used only in certain transient situations, so don't worry about that too much. I'm not sure about...
  23. From a driveability perspective, all we really...

    From a driveability perspective, all we really need to do is increase EOIT enough so that at idle and low RPM the injector doesn't begin to spray until after the exhaust valve closes.

    From a...
  24. The table reflects the 720 degree engine cycle....

    The table reflects the 720 degree engine cycle. Making the injector delay numbers larger makes the End of Injection time later in the engine cycle, also known as increasing the delay.

    There is...
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    Find Dan on Facebook and ask him.

    Find Dan on Facebook and ask him.
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