spark question
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But for an example look at CTC044-01-A1
Last edited by TickTock; Dec 21, 2010 at 05:01 PM.
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From: N. Atlanta Burbs
I want to look at that file and catch up to you.
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From: N. Atlanta Burbs
OK, caught up... read below and let's see if we can have some fun with this.
Good discussion... Also, see my attachment. As you can see I was thinking AFR calibrations with the TPS.
The DBW maps go by MAP and not throttle position. True That being said idle is not at 15 map - so we need to work with what are knowns which are what the map range is when the throttle is released. When watching a Historgram you will notice a drop in kPa during decel (by the numbers only, it's actually an increase in vacuum). It will bottom out on the CTC calibration at 15 kPa then jump back up to idle which is about 25 to 35 kPa. Using my grid that I posed, when the throttle is released around 2500 rpm, the map range is around 28-40 (gained this from observing data runs in the past) depending on gear. So using the closed spark table with a temperature greater than 48c (max on grid), the spark will be 30. Yes, I agree because this table doesn't come into play anymore, the motor is too warm.
I do not believe the closed spark table is a less than temperature table like you stated before otherwise it would never get hit at all once the bike was warmed up and the throttle was first released. If the motor is higher than 48*C then this is true. If lower than 48*C temp then RPM is used, not MAP. So if the motor temp is higher than 48*C then the closed spark table is not used and the main spark table takes over and the only other spark table that comes into play is the Spark Temperature Correction Table.
So given that what I said was accurate, I still don't know what the benefit is to drop into a different spark for a split second and then adjust back. The only benefit I can see is a warm up and decel pop assistant. But again, the other tables take over after 48*C.
I do not believe the closed spark table is a less than temperature table like you stated before otherwise it would never get hit at all once the bike was warmed up and the throttle was first released. If the motor is higher than 48*C then this is true. If lower than 48*C temp then RPM is used, not MAP. So if the motor temp is higher than 48*C then the closed spark table is not used and the main spark table takes over and the only other spark table that comes into play is the Spark Temperature Correction Table.
So given that what I said was accurate, I still don't know what the benefit is to drop into a different spark for a split second and then adjust back. The only benefit I can see is a warm up and decel pop assistant. But again, the other tables take over after 48*C.
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The decel pop assistant that you were suggesting is what I don't get. How does advancing or retarding the timing for that split second help with decel pop? Also based on what you said above regarding the main spark table taking over after warm up, this table would never be hit therefore eliminating any benefit gained for the decel pop.
Last edited by TickTock; Dec 21, 2010 at 08:10 PM.
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From: N. Atlanta Burbs
That was my best shot.
Can you figure it out, am I off base?
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The closed throttle timing table over rides the main spark table when the throttle is closed but the speed sensor sees the bike still in motion. This table can be used to fight stubborn decel popping by adding or subtracting up to 5 degrees in the last two cells. Once the bike comes to a stand still the main spark table is in effect again so set your idle on the main spark tables at ''0'' % throttle at 750 to 1250 rpm.....if you have a touring bike (TBW) the idle is at 5% throttle.
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From: N. Atlanta Burbs
The closed throttle timing table over rides the main spark table when the throttle is closed but the speed sensor sees the bike still in motion. This table can be used to fight stubborn decel popping by adding or subtracting up to 5 degrees in the last two cells. Once the bike comes to a stand still the main spark table is in effect again so set your idle on the main spark tables at ''0'' % throttle at 750 to 1250 rpm.....if you have a touring bike (TBW) the idle is at 5% throttle.
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The closed throttle timing table over rides the main spark table when the throttle is closed but the speed sensor sees the bike still in motion. This table can be used to fight stubborn decel popping by adding or subtracting up to 5 degrees in the last two cells. Once the bike comes to a stand still the main spark table is in effect again so set your idle on the main spark tables at ''0'' % throttle at 750 to 1250 rpm.....if you have a touring bike (TBW) the idle is at 5% throttle.
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Doc explained it to me as even though the table quits at 64 degrees and 4000 rpm, the ecm does not. It will carry the last value to higher rpm's and temps.
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Ok in the closed throttle event, if you advance the timing then you get a burn a little quicker - scavenging the leftover fuel. If you retard the timing it wont burn it as fast and allow it to be somewhat richer in the chamber at the closed throttle event so that it doesn't go lean too fast?