: what is global spark?
04-19-2009, 01:35 AM
i was adjusting some stuff and accidently selected global spark. with my headache from the cold i'm kicking i have brain farts now and then so i hit select again thinking i wold take me back but it changed it to -14. my car ran like poop so i put it to 0. what is global spark adjusting, what's a good place to set it at, in what way is it different from spark 0-2000, 2000-4000, 4000-8000?[clap]
04-19-2009, 02:54 AM
global makes a change to all rpm ranges
0 means you are going to use what is in the tune
any adjustments are from the values in your tune
04-19-2009, 10:26 AM
makes sense! [:D]
04-19-2009, 06:32 PM
Keep in mind that global spark is what I call a hard set , meaning reguardless of what info changes the base timing the +/- you have in global is there reguardless , from crank timing to 10,000 RPM , much like locking the weights and setting the timing in the old dist engines
04-19-2009, 11:10 PM
so what's the relationship between the global spark and the spark 0-2000,2000-4000,4000-8000, how do they affect each other? like if i set the global at -1 does that bump the 0-2000,2000-4000,4000-8000 down 1 from were there set or does it set them all to -1? or does it do something different then that? [poke]
04-19-2009, 11:13 PM
-1 in global would be -1 at every point of timing reguardless of RPM , ECT , IAT LOAD ETC
04-19-2009, 11:20 PM
if you do -1 global and +1 to all the increments, you end up at 0 (the tune's timing values)
04-19-2009, 11:20 PM
so if i had 2000-4000 set at -3 would -1 in global make the 2000-4000 -2 or -1? i really appreciate your expertise![thumb]
04-19-2009, 11:21 PM
-2... its just arithmetic.
04-20-2009, 12:26 AM
Kind of but not really , With changing global it does not look at things like ECT , IAT , TPS , AF etc it give you a -1 AFTER all calculations are done
By changing the 2-4000 -1 these timing changes are done before all other calculations
Or thats my understanding anyway
04-20-2009, 12:57 AM
All those are adders too right? so it doesnt matter before/after if they all add/subtract and none of them multiply.
heres what I mean: 1+1+1+2=5, and 2+1+1+1=5. doesnt matter what order theyre in.
you have the multiplier tables but those only multiply the adder table and you end up with a number that the ecu adds/subtracts to the total timing.
04-20-2009, 07:30 AM
Global spark works like this:
There is a scalar in our software labeled "global spark adder." When anything other than 0 is put into this scalar, that amount is added or subtracted to the final spark value. Which means it is added or subtracted AFTER all of the spark adders/retards are added and taken out. So, this can be dangerous if you do not know what you are doing.
04-20-2009, 01:18 PM
I dont understand the difference between adding before and after the other adders. [???:)]
04-20-2009, 03:53 PM
global adds it reguardless of what other sensors say is happening
Base spark is calculated from information from IAT , ECT , AF etc then comes up with a timing number , just because at 1.000 load and 3200RPM you have 25 deg does not mean after all the calculations you will see 15 deg there , so lets say after all calculations in the base spark it comes out at say 13.8 deg , if you have +2 in global you then will have 15.8 going to the engine
Global is +/- that is +/- just before final timing is sent to the engine it wont care what any other sensor sais to do it will +/- what ever is in the "Global Spark" box
Does that help ?
04-20-2009, 04:31 PM
I still dont see the difference between the two. I'll try to use the situation you described to describe the two situations I see.
1. you have 15 deg in the table, then global +2 to 17, then the IAT ECT AF bring it down -1.2 to 15.8
2. you have 15 deg in the table, then IAT ECT AF bring it down -1.2 to 13.8, then global does +2 to 15.8
in both of these cases global is +2 and you end up with 15.8. The point at which global is added doesnt matter here.
The only time I can see where it would matter is if it factors into the selection between BKT, MBT, and max allowed.
If max allowed is selected by the ecu (and therefore all the adders are not used), is global still used?
04-20-2009, 04:50 PM
the ECU will allways choose the lowest between BKT ,MBT or all timing tables
Global is a FINAL +/- reguardless of anything else going on other then knock sensor
04-20-2009, 05:00 PM
The way I said it the only thing different between 1 and 2 is where the global is added, in both cases you have the SAME final timing, i guess im still not seeing why it matters when global timing is added in. What you just you did was change the timing in the table in case 1 to 16.2...
I dont mean to say everyone is wrong but i do mean to say that nobody has properly proved me wrong yet... so im going to continue to not understand... I want to be proved wrong! lol
ill say what i said before, 1+1+1+2=5 and 2+1+1+1=5 it does not matter what order you add numbers they always come out the same!
04-20-2009, 05:16 PM
If the global is added in BEFORE the math is done to the global as well then it could be anything depending on the ect , iat , af
If it is added AFTER the the math/calculations are done the the +/- is then added
PLEASE beleive me when I say there is a HUGE diff in the final out come if global is used