Microtech Staging formula question
05-19-08, 07:59 AM
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Staging formula question
"for example.......
you have the map stage set at 05",the rpm stage at 3000rpm & the % stage at 50%.Below these points you will be running only on your primary injectors.Say the millisecond value at the current load point is at 1.00m/s,with the stage set at 50% you will in actual fact be running 1.5m/s but only on the primaries.
Once you go above 05" & 3000rpm & the secondary injectors become active,the primary injectors return back to normal (1.00m/s) and all 4 injectors will be running 1.00m/s.
This is why some guys have been playing with the % stage number & the idle is affected.
Adjusting the % stage has no effect once the secondary injectors are switched on."-from the sticky
Is this actually correct? I am having trouble figuring out how two injectors flowing at 1.5 m/s is equivalent to 4 firing at 1.0 m/s.
Does anyone have any equation? I have been plugging in numbers for 15 minutes now and can't figure it out. In the manual it says that the secondaries operate at half the ms value as the primaries at 50%. so if 550s in both stages that would make sense because at 1.0 m/s 550 would be 825 if multiplied by 1.5. if they returned to 1.0 m/s at staging and the secondaries were half of that that would be 550+275=825. So my problem is it is common knowledge that 95% stage is required for 550s and 1600s. Can someone show me how that number was achieved? As far as I can tell 1600s would require more than a 100 percent stage which would not be possible. And that would make sense because with my 95% stage with my 1680 secs and 550 prims it is way to rich when they kick in. AFRs drop from 12.5 to under 9. The only way to get my wot (n/a car right now) at 0hg to run right with an afr around 12 is to drop my 0hg load point lower than my 5hg load point, which obviously isn't right because before they stage (set at 3hg) it leans out as the 5hg interpolates with the 0hg before the switch (and looks like a retarded fuel curve).
I feel like i'm overlooking some simple variable...
you have the map stage set at 05",the rpm stage at 3000rpm & the % stage at 50%.Below these points you will be running only on your primary injectors.Say the millisecond value at the current load point is at 1.00m/s,with the stage set at 50% you will in actual fact be running 1.5m/s but only on the primaries.
Once you go above 05" & 3000rpm & the secondary injectors become active,the primary injectors return back to normal (1.00m/s) and all 4 injectors will be running 1.00m/s.
This is why some guys have been playing with the % stage number & the idle is affected.
Adjusting the % stage has no effect once the secondary injectors are switched on."-from the sticky
Is this actually correct? I am having trouble figuring out how two injectors flowing at 1.5 m/s is equivalent to 4 firing at 1.0 m/s.
Does anyone have any equation? I have been plugging in numbers for 15 minutes now and can't figure it out. In the manual it says that the secondaries operate at half the ms value as the primaries at 50%. so if 550s in both stages that would make sense because at 1.0 m/s 550 would be 825 if multiplied by 1.5. if they returned to 1.0 m/s at staging and the secondaries were half of that that would be 550+275=825. So my problem is it is common knowledge that 95% stage is required for 550s and 1600s. Can someone show me how that number was achieved? As far as I can tell 1600s would require more than a 100 percent stage which would not be possible. And that would make sense because with my 95% stage with my 1680 secs and 550 prims it is way to rich when they kick in. AFRs drop from 12.5 to under 9. The only way to get my wot (n/a car right now) at 0hg to run right with an afr around 12 is to drop my 0hg load point lower than my 5hg load point, which obviously isn't right because before they stage (set at 3hg) it leans out as the 5hg interpolates with the 0hg before the switch (and looks like a retarded fuel curve).
I feel like i'm overlooking some simple variable...
05-19-08, 11:01 PM
#2
i have tuned many cars with 550 and 1700cc injectors with change the injector stage % to 99%.
many different ways to skin the cat as they say.
try a few different combos and see what works on your car.
also with 550 and 1700cc injectors dont bring them at 3000rpm. too late
eariler you bring them on the smoother it will be.
many different ways to skin the cat as they say.
try a few different combos and see what works on your car.
also with 550 and 1700cc injectors dont bring them at 3000rpm. too late
eariler you bring them on the smoother it will be.
05-20-08, 09:27 AM
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Yeah thanks I used that advice about the earlier staging at 1320 rpm that you gave me before and it helped. I was just kind of curious as to what the formula was to make sense of the staging % number (even though it would still not be exact due to real life conditions)
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