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Old 05-09-2010, 04:43 PM   #1
Ryan314
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Default Learning view screen shot... how is it?

This is my very first time venturing into the whole open source logging/reflash world. I recently swapped in an EJ257 short block and my tuner wanted me to send him a few logs and also a learning view screen shot before I go get tuned after the motor breaks in. Can someone explain what this shot is telling me, and if it's either good or bad?



I have not brought the motor past 3500 rpm.
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Old 05-09-2010, 04:54 PM   #2
kh15
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looks great, no stored timing changes (due to knock), and your fuel trims are fine (rule of thumb is keep them over -5 and under +5)
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Old 05-09-2010, 05:18 PM   #3
mattGT
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Why would IAM be 16? Isn't it usually 1 on a happy car?
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Old 05-09-2010, 05:27 PM   #4
NSFW
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Quote:
Originally Posted by mattGT View Post
Why would IAM be 16? Isn't it usually 1 on a happy car?
Depends on the ECU.
16-bit ECUs run IAM between 0 and 16.
32-bit ECUs run IAM between 0 and 1.
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Old 05-09-2010, 05:30 PM   #5
NSFW
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I agree with kh15 about the health of your motor.

However the tune you're using now has silly values for the rows and columns of the knock learning table. I doubt you're going to rev over 12,800 and all knock events between 1.5 and 4.0 load will be lumped together. Unless you're going to be running a huge turbo, you're not going to be pulling more than 4.0 load. My 3076 pulls about 3.6 max.

This isn't bad, but I'd recommend changing them to make that table more useful. Judging by the number of tunes I've seen with the same (stock) settings, I don't think make tuners even realize this is possible.
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Old 05-09-2010, 05:39 PM   #6
mattGT
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Quote:
Originally Posted by NSFW View Post
Depends on the ECU.
16-bit ECUs run IAM between 0 and 16.
32-bit ECUs run IAM between 0 and 1.
Aha. So 16 is happy town on a 16 bit ecu. thx
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Old 05-09-2010, 06:09 PM   #7
Ryan314
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Thanks for the responses.

I forgot to say that I have a limp/cripple map loaded onto the car right now for the break in period. No boost or high rpm is allowed.

Can someone explain to me what 'IAM' is?
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Old 05-10-2010, 11:06 AM   #8
scoobystas
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Ignition advance multiplier.

your ecu has a base timing map that it uses all the time. it also has an advance timing map that it the ecu uses to add timing to your base timing when the car is happy and not knocking. If it is knocking, the ECU uses feedback knock correction, fine learning knock correction, or IAM.

so when your car is at 16, the full amount of timing from the advance tables are being added to your base timing values, your car is at optimal performance levels, you are running maximum timing that your map allows.

IAM can also be used by the ecu as a global/all encopassing way for your ecu to pull timing if it gets a large knocking at wot. Feedback knock correction will pull small amounts of timing if it hears it instantly, while FLKC allows for your ecu to learn knock events in specific load and rpm ranges.

But IAM doesn't care at what load range or rpm the big knock occured, It will drop your IAM to say 12, which is 3/4 of your full advance values, so only 3/4 of the full advancing timing from your entire Advance map will be added to your base map, making the car safer to drive for the time being until your car sees that the knock is gone and advances your IAM back up to 16.

i hope that was sorta clear.
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Old 05-10-2010, 05:30 PM   #9
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^Definitely, thanks.
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Old 06-02-2010, 04:11 PM   #10
bren wrx
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Quote:
Originally Posted by NSFW View Post
I agree with kh15 about the health of your motor.

However the tune you're using now has silly values for the rows and columns of the knock learning table. I doubt you're going to rev over 12,800 and all knock events between 1.5 and 4.0 load will be lumped together. Unless you're going to be running a huge turbo, you're not going to be pulling more than 4.0 load. My 3076 pulls about 3.6 max.

This isn't bad, but I'd recommend changing them to make that table more useful. Judging by the number of tunes I've seen with the same (stock) settings, I don't think make tuners even realize this is possible.
The map isn't setup to 4.0.
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Old 06-02-2010, 04:32 PM   #11
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Quote:
Originally Posted by bren wrx View Post
The map isn't setup to 4.0.
it is according to your LV...
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Old 06-02-2010, 04:36 PM   #12
bren wrx
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Quote:
Originally Posted by kh15 View Post
it is according to your LV...
In this particular break-in map it is set to, in case of failure in the boost solenoid/controller while the customer installs his parts/sorts his problems and it spikes free unlimited boost the ranges are there to save it. Seen it happen before. There is logic behind why it's there.

When a final load is tuned for, the tables can be modified accordingly.
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Old 06-06-2010, 03:29 AM   #13
warmup
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why 16bit ecus have so many FLKC load columns, a 32bit one has only 6 columns for load.
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Old 06-06-2010, 01:01 PM   #14
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Quote:
Originally Posted by warmup View Post
why 16bit ecus have so many FLKC load columns, a 32bit one has only 6 columns for load.
My only guess is that they realized that more resolution makes tuning easier, but less resolution is probably better for engine health. It's interesting that there are a lot of 16-bit roms with some of the load and rpm columns and rows disabled.
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