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Old 03-12-2020, 12:31 PM   #26
jon7009
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Member#: 394646
Join Date: Jun 2014
Chapter/Region: NWIC
Location: Oregon
Vehicle:
2003 WRX Flex Fuel
EJ205 TD04L FMIC SD

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forum rules state to quote and not snippet quote, IIRC

anyways, trueno - about injector scalar and 16-bit, 32-bit

Cobb and all OEM roms have the same proportional relationship to error in fueling and error in load calculation, same for Carberry just that the RAW value in Carberry is doubled because of the load increase. So instead of (2707090 / RAW) it's (5414180 / RAW) for cc/min scalar conversion.‬

error in calculating mass air flow grams per engine rotation (g/rev) is directly proportional to error in fueling...

*because*

injectors are scaled such that a given duration of time (IPW Ás)
will equal stoichiometric fuel ratio at 1.0 g/rev. Divide 2707090 by RAW value to get cc/min for any OEM ECU reflash except Carberry. Divide (2707090 * 2) by RAW value to get cc/min on Carberry.

552cc on 16-bit is not the same value as 562cc on 32-bit or whatever. notice they changed latency as well, they didn't just have some weird compensation or modifier on one ecu or another, meaning you should use one value or another, they went through phases of latency and scalar changes and it has no bearing on which software/ecu platform is being used.

if you look at enough rare roms from other regions you'll see the three main stock top feeds (light blue, pink, dark blue) have at least two sets of calibration tables, each.
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Last edited by jon7009; 03-12-2020 at 12:36 PM.
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Old 03-21-2020, 02:49 PM   #27
contaminatrix
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Member#: 435611
Join Date: Dec 2015
Chapter/Region: International
Location: Nairobi
Vehicle:
2002 SG5-2.0-XT-JDM
45A, originally 18L

Default

Quote:
Originally Posted by jon7009 View Post
forum rules state to quote and not snippet quote, IIRC

anyways, trueno - about injector scalar and 16-bit, 32-bit

Cobb and all OEM roms have the same proportional relationship to error in fueling and error in load calculation, same for Carberry just that the RAW value in Carberry is doubled because of the load increase. So instead of (2707090 / RAW) it's (5414180 / RAW) for cc/min scalar conversion.‬

error in calculating mass air flow grams per engine rotation (g/rev) is directly proportional to error in fueling...

*because*

injectors are scaled such that a given duration of time (IPW Ás)
will equal stoichiometric fuel ratio at 1.0 g/rev. Divide 2707090 by RAW value to get cc/min for any OEM ECU reflash except Carberry. Divide (2707090 * 2) by RAW value to get cc/min on Carberry.

552cc on 16-bit is not the same value as 562cc on 32-bit or whatever. notice they changed latency as well, they didn't just have some weird compensation or modifier on one ecu or another, meaning you should use one value or another, they went through phases of latency and scalar changes and it has no bearing on which software/ecu platform is being used.

if you look at enough rare roms from other regions you'll see the three main stock top feeds (light blue, pink, dark blue) have at least two sets of calibration tables, each.
hey thanks for this information. how exactly does this calculation affect fueling? does that mean that a scalar of 552.47 on carberry is different from 552.47 on other maps? Finally got everything dialled in but with this info I wonder whether I should be running a different setting.

My injectors are pinks.

Thanks
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Old 03-26-2020, 10:20 AM   #28
jon7009
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Member#: 394646
Join Date: Jun 2014
Chapter/Region: NWIC
Location: Oregon
Vehicle:
2003 WRX Flex Fuel
EJ205 TD04L FMIC SD

Default

comparing cc/min flow rates, they are the same
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Old 03-26-2020, 02:27 PM   #29
contaminatrix
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Member#: 435611
Join Date: Dec 2015
Chapter/Region: International
Location: Nairobi
Vehicle:
2002 SG5-2.0-XT-JDM
45A, originally 18L

Default

Quote:
Originally Posted by jon7009 View Post
comparing cc/min flow rates, they are the same
thank you man.

and thanks for being a great resource. I've learnt a ton from your posts here and especially on rr.
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