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Old 04-16-2009, 11:53 PM   #1
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SCT "timing" question

On the user settings, is -1 advanced (btdc), or retarded (atdc)? It could kinda go both ways. Not like im gonna change it because im too scared at the moment, but incase i grow some balls. Whats the benifits of more/less timing at higher rpm as opposed to low rpm? My only knowledge on timing is with those distributer things on air cooled vw's, and at work for equalizing bank to bank manifold temps, or individual cylinder temp adjustment. We only adjust for temp reasons, not power. And WOT fueling, the change is only a percent difference (say 10%) from the base point, not .10 AFR change...right?


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Old 04-17-2009, 12:38 AM   #2
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the user settings are all +/- your tune that is on the car.

so assuming you have 19 degrees of timing in one spot, if you put +1 it will go to 20. But realize the spark number is gotten from a table, not a specific value.

dont change things based on how big your balls are, you need to know the consequences of your changes and you need to know what to watch out for after you make them. For example, take a look at squillyb's rods he scattered all over the road after he advanced timing doing a 50 shot without datalogging to check for knock.

I believe the afr % cahnges are in lambda. 1% = 0.01 lambda = 0.147afr
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Old 04-17-2009, 06:40 AM   #3
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The user options for spark add or subtract whatever amount you choose to your borderline knock table, which is you main spark table. All of the other adders/retards for temp, combustion, knock then add or subtract from that table.

The WOT fuel changes are percent changes that get applied to your base fuel table (commanded.) The base fuel table is in lambda but that lambda value is an actual air/fuel number. So, if you add 10% fuel to your tune that is commanding 12.6 afr (0.86 lambda) you would then be commanding ~11.6 (0.774 lambda.) A very general rule of thumb is 10% fuel in either direction will typically change your afr by 1 point in that direction. Meaning adding 10% will take a 12.5 to an 11.5 and subtracting 10% will take a 12.5 to a 13.5.
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Old 04-17-2009, 10:13 AM   #4
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the user settings are all +/- your tune that is on the car.

so assuming you have 19 degrees of timing in one spot, if you put +1 it will go to 20. But realize the spark number is gotten from a table, not a specific value.

dont change things based on how big your balls are, you need to know the consequences of your changes and you need to know what to watch out for after you make them. For example, take a look at squillyb's rods he scattered all over the road after he advanced timing doing a 50 shot without datalogging to check for knock.

I believe the afr % cahnges are in lambda. 1% = 0.01 lambda = 0.147afr
Yeah, i pretty much understand all that. But +1 is an advancement of 1 degree to the base table setting in that particular speed/load block, correct? More or less, + =advancing and - = retarding?
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The user options for spark add or subtract whatever amount you choose to your borderline knock table, which is you main spark table. All of the other adders/retards for temp, combustion, knock then add or subtract from that table.

The WOT fuel changes are percent changes that get applied to your base fuel table (commanded.) The base fuel table is in lambda but that lambda value is an actual air/fuel number. So, if you add 10% fuel to your tune that is commanding 12.6 afr (0.86 lambda) you would then be commanding ~11.6 (0.774 lambda.) A very general rule of thumb is 10% fuel in either direction will typically change your afr by 1 point in that direction. Meaning adding 10% will take a 12.5 to an 11.5 and subtracting 10% will take a 12.5 to a 13.5.
Great, thats what i needed on the fueling aspect.
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Old 04-17-2009, 12:04 PM   #5
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iirc the user settings only allow you to change blocks of rpm ranges 0-2000 2000-4000 4000-6000 for ALL loads.
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Old 04-17-2009, 12:05 PM   #6
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Let me give you some advise , LEAVE IT ALONE

Tom
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Old 04-17-2009, 12:19 PM   #7
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Yes, the spark changes will add or subtract what you choose to the entire rpm range chosen. It is advised not to change them unless there is a reason to.
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Old 04-17-2009, 03:49 PM   #8
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Quote:
Originally Posted by 1turbofocus View Post
Let me give you some advise , LEAVE IT ALONE

Tom
Quote:
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Yes, the spark changes will add or subtract what you choose to the entire rpm range chosen. It is advised not to change them unless there is a reason to.

Thanks gentlemen for the advice... I wasnt gonna alter it, for i have little nuts when it comes to the durability of my daily driver. Was only curious. Tom.. I logged a run from 2k to redline in third gear with the pids you wanted and then some. If you want another run, or for me to go through the gears i will. But theres no way for me to do a forth gear pull like that. I will send the file tonight. I waited a few days to let everything set in, as i assum the ecu is still using the "learn" feature...
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Old 04-17-2009, 03:54 PM   #9
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Quote:
Originally Posted by 1turbofocus View Post
Let me give you some advise , LEAVE IT ALONE

Tom
Quote:
Originally Posted by Blivit View Post
Yes, the spark changes will add or subtract what you choose to the entire rpm range chosen. It is advised not to change them unless there is a reason to.

Thanks gentlemen for the advice...you too ILL.. I wasnt gonna alter it, for i have very little balls when it comes to the durability of my daily driver. Was only curious. Tom.. I logged a run from 2k to redline in third gear with the pids you wanted and then some. If you want another run, or for me to go through the gears i will. But theres no way for me to do a forth gear pull like that. I will send the file tonight. I waited a few days to let everything set in, as i assume the ecu is still using the "learn" feature...
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