decel fuel cut ignition retard table - trigger conditions?
May 28, 2012, 11:30 AM
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decel fuel cut ignition retard table - trigger conditions?
I'm trying to figure out when the "decel fuel cut ignition retard" table is activated as it seems to have no effect when i'm changing it's values...
Is it activated only when the values at the "decel fuel cut delay" table are exceeded (= fuel cut is applied) or is it always applied on off-throttle conditions?
Is it activated only when the values at the "decel fuel cut delay" table are exceeded (= fuel cut is applied) or is it always applied on off-throttle conditions?
May 30, 2012, 08:25 AM
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Seems like ecuflash did not re-flash the changed values. After flashing the whole rom it now works.
What i found out until now:
The ignition retard table is activated with some short delay after hitting the matching load values, but not directly connected to the fuel cut delay values. so ignition isn't only altered when fuel cut is active, but also when the fuel cut delay time isn't reched.
maybe another table controls the delay for ign. retard table, I'll take a look into this when i find the time.
So it is possible to use the ign retard table and fuel cut delay tables to fine-tune (or even implement) ALS.
I'm using it to soften up the ALS activation by slightly reducing the ignition towards the ALS values before ALS activates.
Via the fuel cut delay tables i disable fuel cut at ALS-relevant loads and slightly enrich the fuel tables.
ALS is much softer initiated which is way more drivable when rolling into or through a corner and maybe also a bit less aggressive on the turbo...
only negative point: it's always active - not triggered by load, engine temp etc like ALS.
What i found out until now:
The ignition retard table is activated with some short delay after hitting the matching load values, but not directly connected to the fuel cut delay values. so ignition isn't only altered when fuel cut is active, but also when the fuel cut delay time isn't reched.
maybe another table controls the delay for ign. retard table, I'll take a look into this when i find the time.
So it is possible to use the ign retard table and fuel cut delay tables to fine-tune (or even implement) ALS.
I'm using it to soften up the ALS activation by slightly reducing the ignition towards the ALS values before ALS activates.
Via the fuel cut delay tables i disable fuel cut at ALS-relevant loads and slightly enrich the fuel tables.
ALS is much softer initiated which is way more drivable when rolling into or through a corner and maybe also a bit less aggressive on the turbo...
only negative point: it's always active - not triggered by load, engine temp etc like ALS.
May 31, 2012, 08:11 AM
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The car i'm using this method doesn't have SAS hardware. The throttle is kept open via the stop screw. Idle is sawing at around 1300-1800 but that's ok for this car...
Jun 1, 2012, 02:44 PM
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I'm using a 9653 ROM on this car.
I just ran into some strange/dangerous behaviour of the software:
I was re-adjusting the values within the decel. ign. ret. table and forgot i had set some negative values in the ign. table to test something else.
As the decel. ign. ret. table is alway substracted from the ign. table values, the timing should have gone way over 40° ATDC which exceeded the defined max. ign. ret. -> ignition timing shot up to 50° BTDC
I just ran into some strange/dangerous behaviour of the software:
I was re-adjusting the values within the decel. ign. ret. table and forgot i had set some negative values in the ign. table to test something else.
As the decel. ign. ret. table is alway substracted from the ign. table values, the timing should have gone way over 40° ATDC which exceeded the defined max. ign. ret. -> ignition timing shot up to 50° BTDC
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