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Old 09-17-2007, 04:43 PM   #1
vnmvx-0
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Default does the ecu learn after protune?

i just got my 03 wrx protuned

it has uppipe/catted downpipe
and made 215awp @ 6000rpms and 204wtq @4750rpms

does the ecu still take a little while to learn the tuning parameters or is it the way it is when it rolls off the dyno?
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Old 09-17-2007, 05:36 PM   #2
testes1010
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depends on the tuner & where he set the initial IAM at.....
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Old 09-17-2007, 06:24 PM   #3
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Originally Posted by testes1010 View Post
depends on the tuner & where he set the initial IAM at.....
can you explain what that means?
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Old 09-17-2007, 06:32 PM   #4
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IAM(initial advance multiplier) is what the Ecu uses to advance timing and boost and what not. Basically it multiplies everything on the map so it runs at it's optiumum settings. Stock this number sits at like 8 and it learns it's way up to 16<<the happy range. Some tunners can change this so there is no learning so it's allways at 16 after a hard reset. Look up the ecu learning trick. It's real easy to do once you get the hang of it.
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Old 09-17-2007, 06:42 PM   #5
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thanks for the info ^ i guess the only way for me to figure out what my ecu is set at is to ask the protuner
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Old 09-17-2007, 06:51 PM   #6
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If you reflash it with the tuned map, it'll start out exactly the way it came off the dyno [unless the tuner made some changes post-dyno] and then it will learn both timing and fuel trims from there as necessary.
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Old 09-17-2007, 08:50 PM   #7
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Originally Posted by flycaster View Post
If you reflash it with the tuned map, it'll start out exactly the way it came off the dyno [unless the tuner made some changes post-dyno] and then it will learn both timing and fuel trims from there as necessary.
what do you mean "start out"..the car was reflashed with the new map after tuning..but is there still some learning involved?

i heard some people saying to reset the ecu every couple of weeks to erase pulled timing from the memory and then there are the people that say to reset the ecu when weather conditions change drastically and elevation/humidity etc
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Old 09-17-2007, 08:56 PM   #8
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Quote:
Originally Posted by vnmvx-0
what do you mean "start out"..the car was reflashed with the new map after tuning..but is there still some learning involved?

i heard some people saying to reset the ecu every couple of weeks to erase pulled timing from the memory and then there are the people that say to reset the ecu when weather conditions change drastically and elevation/humidity etc
Well those people are dumb as bricks, the ecu pulls timing from knock and if there is no knock it will add it back in on its own. If it is severe knock and it learns, and then you reset it back into knock territory which will eventually kill your engine.

THE ECU IS CONSTANTLY LEARNING!!! There is no need to reset it EVER unless you fixed an issue that set off a CEL.
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Old 09-17-2007, 08:59 PM   #9
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Quote:
Originally Posted by vnmvx-0 View Post
...
i heard some people saying to reset the ecu every couple of weeks to erase pulled timing from the memory and then there are the people that say to reset the ecu when weather conditions change drastically and elevation/humidity etc
I hope you aren't listening to such "people" because erasing your learned timing and fuel trims all the time is a stupid and unnecessary thing to do if your car is properly tuned.
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Old 09-17-2007, 09:00 PM   #10
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Originally Posted by Master2192 View Post
Well those people are dumb as bricks, the ecu pulls timing from knock and if there is no knock it will add it back in on its own. If it is severe knock and it learns, and then you reset it back into knock territory which will eventually kill your engine.

THE ECU IS CONSTANTLY LEARNING!!! There is no need to reset it EVER unless you fixed an issue that set off a CEL.
exactly. If you have the CEL, fix the issue, don't mask it.
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Old 09-17-2007, 09:14 PM   #11
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Quote:
Originally Posted by Master2192 View Post
Well those people are dumb as bricks, the ecu pulls timing from knock and if there is no knock it will add it back in on its own. If it is severe knock and it learns, and then you reset it back into knock territory which will eventually kill your engine.

THE ECU IS CONSTANTLY LEARNING!!! There is no need to reset it EVER unless you fixed an issue that set off a CEL.
so i guess i will just drive it and leave the ecu alone...thanks for clearing this up

Quote:
Originally Posted by supermarkus View Post
I hope you aren't listening to such "people" because erasing your learned timing and fuel trims all the time is a stupid and unnecessary thing to do if your car is properly tuned.
yea i know thats a problem with these boards is there is lots of mixed info..i think one of the users adamantly said that the ecu stops learning after a short period of time and if you are to change weather conditions or elevation you are getting more of a benefit if you reset it prior to those situations and let it learn


the tuner didnt tell me to go out and do some WOT runs or anything so i wonder if im just supposed to drive it normally after the tune or go on some heavy runs to get the ecu to adapt..AHH a little confused
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Old 09-17-2007, 09:26 PM   #12
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Originally Posted by vnmvx-0 View Post
the tuner didnt tell me to go out and do some WOT runs or anything so i wonder if im just supposed to drive it normally after the tune or go on some heavy runs to get the ecu to adapt..AHH a little confused
Master2192 is 100% correct. The ECU constantly learns, adjusting to different weather conditions, fuel changes, etc. If the ecu has the same intial IAM as stock (which is 8 after a reset), it will learn quicker to 16(assuming the tune is safe) driving aggressively. It will learn slower babying it.
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Old 09-18-2007, 12:01 PM   #13
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Just to add a bit more info here, the concept is called hysteresis. Basically, the system makes adjustments based on the history of what the system has seen. When you reset the ECU, it basically hasn't seen anything so any new information has a higher priority than it would otherwise. Of course, it's not an infinite system and can only remember so much and older stuff falls out of relevance so it can always adapt. It just does so slower so it's more stable as time goes on.
Maybe think of it analogous to the way we see the history of the world. It's been around for 4.6 billion years. For around 3 billion years life evolves which diverges into different kingdoms and specialization of those over the next 1 billion. This is all before people were here. Even 500 million years ago, dinosaurs weren't around, but 250 million or so, they died, but 150 million years ago, birds came about. Then just 2 million years ago, apes became "people". Then two thousand years ago, a Jewish carpenter walked around Europe and started the largest religious change the world had seen. Around 500 years ago, some crazy guy decided to sail around the world and ran into America. About a century ago, we invented the car. 30 years ago, a crazy guy named Steve invented the personal computer. 10 years ago, we had the internet revolution. A couple years later, the dot com crash. Then we went to fight in Iraq for the 2nd time, you bought a Subaru, sub-prime mortgages are a problem, you had cereal for breakfast, now you're reading NASIOC.
What does that trip thru the history of the world?(btw, forgive an inaccuracies, I'm not a historian and that's mostly off the top of my head). Look what you remember about today? And this week? And this year? And the last decade? And then the century? Then the millennium? Probably about the same for both, even tho, as you go back, time spans increase exponetially. It's just less important to how you live your daily life the farther you go back.

Man I talk to much.
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Old 09-18-2007, 03:36 PM   #14
vnmvx-0
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Quote:
Originally Posted by mrbell View Post
Just to add a bit more info here, the concept is called hysteresis. Basically, the system makes adjustments based on the history of what the system has seen. When you reset the ECU, it basically hasn't seen anything so any new information has a higher priority than it would otherwise. Of course, it's not an infinite system and can only remember so much and older stuff falls out of relevance so it can always adapt. It just does so slower so it's more stable as time goes on.
Maybe think of it analogous to the way we see the history of the world. It's been around for 4.6 billion years. For around 3 billion years life evolves which diverges into different kingdoms and specialization of those over the next 1 billion. This is all before people were here. Even 500 million years ago, dinosaurs weren't around, but 250 million or so, they died, but 150 million years ago, birds came about. Then just 2 million years ago, apes became "people". Then two thousand years ago, a Jewish carpenter walked around Europe and started the largest religious change the world had seen. Around 500 years ago, some crazy guy decided to sail around the world and ran into America. About a century ago, we invented the car. 30 years ago, a crazy guy named Steve invented the personal computer. 10 years ago, we had the internet revolution. A couple years later, the dot com crash. Then we went to fight in Iraq for the 2nd time, you bought a Subaru, sub-prime mortgages are a problem, you had cereal for breakfast, now you're reading NASIOC.
What does that trip thru the history of the world?(btw, forgive an inaccuracies, I'm not a historian and that's mostly off the top of my head). Look what you remember about today? And this week? And this year? And the last decade? And then the century? Then the millennium? Probably about the same for both, even tho, as you go back, time spans increase exponetially. It's just less important to how you live your daily life the farther you go back.

Man I talk to much.
wow talk about a tangent, lol

good post to think about, the tuner told me he set the IAM to its highest after the tune
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