"displacement" do anything??
11-11-2005, 05:51 AM
#1
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"displacement" do anything?? I use LS1 edit and LS2 edit. In the engine/fuel pages, there is a tab for cylinder displacement. Does changing this number actually do anything, or is it just for reference???
I assumed this number might "scale" the VE tables, or something similar, but now I'm not so sure. The Stock tune in my 2005 LS2 has the wrong displacement listed, so I'm starting to think it is just there for reference.
Anybody know?
**here's what I'm talking about. This is the OEM tune from my 2005 LS2 Vette (not the race car)
I assumed this number might "scale" the VE tables, or something similar, but now I'm not so sure. The Stock tune in my 2005 LS2 has the wrong displacement listed, so I'm starting to think it is just there for reference.
Anybody know?
**here's what I'm talking about. This is the OEM tune from my 2005 LS2 Vette (not the race car)
11-11-2005, 06:32 AM
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I'm not sure exactly what the PCM does with it, but my psychic horse power meter felt a differnce when I set mine to the appropiate displacement.
When I changed it in EFILive, it did rescale my VE table.
When I changed it in EFILive, it did rescale my VE table.
11-11-2005, 07:10 AM
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it doesn't seem to rescale my primary VE, but maybe there is a "multiplyer" somewhere in the system. Unfortunately, I can't find any logging software for the new CAN enabled cars, so I can't play with the fun stuff yet.
11-11-2005, 12:22 PM
#5
Originally Posted by TAQuickness
I'm not sure exactly what the PCM does with it, but my psychic horse power meter felt a differnce when I set mine to the appropiate displacement.
When I changed it in EFILive, it did rescale my VE table.
When I changed it in EFILive, it did rescale my VE table.
11-12-2005, 12:03 AM
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Originally Posted by Bink
TAQuickness- I think your "psychic horse power meter" should be included in your sig.
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11-12-2005, 08:48 AM
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.708 x 8 = 5.664 L
That tells the pcm the volume of each cylinder. If you were to add a 4" crank then your cyl volume would change, making it important to change this number to reflect the correct volume. If you were to increase your cyl volume and not change this number your calibrations that use this would be off resulting in less power.
That tells the pcm the volume of each cylinder. If you were to add a 4" crank then your cyl volume would change, making it important to change this number to reflect the correct volume. If you were to increase your cyl volume and not change this number your calibrations that use this would be off resulting in less power.
11-12-2005, 10:05 AM
#9
it's a constant multiplier for just about every calculation in there. so while not exactly crucial to have it set up (it will just rescale the VE table by a linear factor) it is easy enough (bore^2*stroke*PI, then convert to liters) to do it, and the benefit of is is that you get to have a meaningful VE table (aka 100% means you're filling your cylinder with the exact amount of air the cylinder displaces). just do it, it's simple math.
