disabling lean spool
Oct 13, 2008, 11:04 PM
#2
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If I am not mistaken, Lean spool is there to compensate for EGR solenoid opening,
the EGR can be disabled via bit 12 in Periphery 0 (faa), I cannot confirm that bit 0 of Periphery1 (fba) has this effect.
the EGR can be disabled via bit 12 in Periphery 0 (faa), I cannot confirm that bit 0 of Periphery1 (fba) has this effect.
Oct 14, 2008, 04:30 PM
#3
It does to a certain extent, but it also mess's with the comms to the ecu.
i.e you can't read or clear DTC's.
So I would imagine the same would happen with the 8 and 9 ecu's.
I can't remember if I have tested only changing 0xFBA bit 0 or not though.
Oct 14, 2008, 04:48 PM
#4
why FCA?
I tested FBA this morning - no discernible difference between using the RPM method and fba_bit0.
if anyone wants I can post up the XLS with the two logs.
I havn't tested setting the RPM's back to default and using bit0, however the code indicates once you set bit0 the RPM's are no longer even checked.
I think from pure ECU performance perspective we will get more cycles available by disabling FBA bit0.
I tested FBA this morning - no discernible difference between using the RPM method and fba_bit0.
if anyone wants I can post up the XLS with the two logs.
I havn't tested setting the RPM's back to default and using bit0, however the code indicates once you set bit0 the RPM's are no longer even checked.
I think from pure ECU performance perspective we will get more cycles available by disabling FBA bit0.
Oct 14, 2008, 04:58 PM
#5
It was something I was told to do, before we found the lean spool start and stop address's.
But as said, it messed with the comms in the ecu, so you couldn't check or clear dtc's.
But as said, it messed with the comms in the ecu, so you couldn't check or clear dtc's.
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japspec (Mar 25, 2021)
Oct 14, 2008, 05:46 PM
#7
1285 and 1281 are the direct byte addresses for lean spool.
Since all Evo ECU's use words we change that to 1284 and 1280 (using a word size).
Its more consistent and just better...
But yes - I think if we use the FBA bit0 method from now on it will become even simpler.
Since all Evo ECU's use words we change that to 1284 and 1280 (using a word size).
Its more consistent and just better...
But yes - I think if we use the FBA bit0 method from now on it will become even simpler.
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Oct 16, 2008, 12:07 AM
#10
Alright - so I changed my rpm's back to default 2500/7000 and left the bit disabled. and my AFR stayed the same.
I think we should make this the preferred method for disabling lean spool.
If anyone else with a 7/8 ROMID wants to give this a go then that would be great
I think we should make this the preferred method for disabling lean spool.
If anyone else with a 7/8 ROMID wants to give this a go then that would be great
