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Old 07-28-2012, 07:16 PM   #1
OC_Nooby
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Default IAM 1 bad? Help me understand.

Hey Guys,

I'm a total noob and trying to understand IAM. Is a lower value IAM good or bad? In my car i'm having an IAM of 1 (as seen in learning view). From what I'm understanding I need a higher IAM (16) but I also read that with an IAM of 1 its in fine correction for knock ?

I've been reading around but still am slightly fuzzy on the topic.

Any help would be great!

Thanks
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Old 07-28-2012, 07:29 PM   #2
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On the 16bit cars (02-05wrx), it was 0-16. The new 32bit uses 0-1.0.

In learning view, if it is 0-16, it will display an integer 0-16. Otherwise it will display a decimal between 0.0 and 1.0

Last edited by izergfx; 08-02-2012 at 09:48 AM.
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Old 07-28-2012, 07:34 PM   #3
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I have a wrx so 16bit. I was thinking though. i'm not running the boost solenoid. Just installed a nipple for boost on the tmic elbo and put it to the waste gate. Car drives great but IAM is set to 1. Which is why i'm running in open loop fail safe.

Should I just tee to the boost solenoid from the waste gate/ manifold.
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Old 07-28-2012, 07:42 PM   #4
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what year of wrx??
If your looking for a quick answer, you wont find it here.
Check the FAQ's.
Also, if your not running the boost control solenoid, u should be at least using a MBC.
If not of those are there, ur running wastegate pressure. still not a good thing.
Do ur research. In the FAQ'S you will find proper routing for the vaccum/boost lines.
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Old 07-28-2012, 07:52 PM   #5
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2003 WRX with an STI swap. I know how the boost solenoid should be hooked up. I guess i'll hook it up and see if the IAM changes. I'm just running my gt3076R with wastegate (no boost solenoid) it opens up at 12.5-14psi by itself. Thats why I decided i don't really need the solenoid. Though not having the solenoid might cause some issue that the ECU might think is bad but actually there is nothing wrong.
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Old 07-28-2012, 07:55 PM   #6
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Did the swap include the ecu?
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Old 07-28-2012, 08:08 PM   #7
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Nope running everything WRX. Harness and ECU that is. I brought over timing map from a stock sti map. Not running AVCS.

Currently hooking up the boost solenoid. Ill report back.

IAM still 1

Last edited by OC_Nooby; 07-28-2012 at 08:37 PM.
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Old 07-28-2012, 10:17 PM   #8
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http://www.romraider.com/forum/viewt...p=82483#p82483

I put my maps if anyone could have a look! Currently running the safer timing map.
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Old 07-28-2012, 10:54 PM   #9
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IAM works basically the same on the 16 and 32-bit ECUs. The difference is the range. The 16-bit ECUs can have a value between 0-16. 0 is the worst, 16 is normal. Take the value, divide by 16, multiply by your timing additive, and you get your actual timing additive. The 32-bit ECUs can have a value between 0-1. 0 is the worst, 1 is normal. Take the value, multiply by your timing additive, and you get your actual timing additive.

Does your map have a table that sets the initial IAM value after a reset? If so, change that to something other than 16, reset the ECU, and then immediately take a learning view. That will tell you if the 1.0 that you're seeing is really a 1 on the 0-16 scale of the 16-bit ECU, or a 16 on the 0-16 scale of the 16-bit ECU that's been scaled to a 1.0 by LearningView in an attempt to keep things consistent between the different ECU versions.

For example, if you set the initial IAM to 8, reset, then take a learning view. If you see an 8, you know the 1 is really a 1, and is a bad sign of det. If you see a 0.5, then you know the 1 is really a 16, and you're dandy.


Or, you could just make a quick log of your IAM using RomRaider and see what it says. RR doesn't do any scaling, so since you have a 16-bit ECU, a 1 would be bad, and a 16 would be normal.

Last edited by the suicidal eggroll; 07-28-2012 at 11:08 PM.
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Old 07-28-2012, 11:04 PM   #10
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I'm a tool.

So basically I set my Advanced Multiplier Initial to 1 and Advanced Multiplier to 0 (like a sti 32bit, couldnt do 0.5 if I recall). So go figure this would never have changed. I set it back to 8 and 4. Now IAM is at 8 but doesn't change. Do you set this value to 16 and if the ECU detects knock it will lower the IAM?

Thats what you get for blindly swapping from STI to WRX. Stupid mistake.

Thanks!
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Old 07-28-2012, 11:06 PM   #11
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Just reread about IAM @ 16. So I have IAM at 8 in learning view. How long does it take to go back to 16? Does one have to drive quiet a bit?
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Old 07-28-2012, 11:09 PM   #12
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I would leave the initial at 8 unless you're certain the tune is safe. It will take a while for it to come up, I would give it a couple of days.
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Old 07-28-2012, 11:11 PM   #13
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Quote:
Originally Posted by the suicidal eggroll View Post
I would leave the initial at 8 unless you're certain the tune is safe. It will take a while for it to come up, I would give it a couple of days.
I could kiss you!

No homo.

Thank You!!!!

Now to fine tune my injectors a little more and we are golden!

Should ask. I'm using a USDM STI 05 base Map. That's the North American 2.5L correct? Not sure why the rev limit is 7.6k (I use it to 6.8k)
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Old 07-29-2012, 12:40 AM   #14
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That'll do it

There is a trick to quickly increase IAM, by brake boosting around 3-4k RPM a few times.

I set the initial to 1 (or 16) when tuning, but always starting from a safe timing map! After that it goes back to 0.5 (or 8)

On the rev limiter, it is 7000 from the factory on that motor/ecu.
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Old 07-29-2012, 09:53 AM   #15
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Quote:
Originally Posted by izergfx View Post
That'll do it

There is a trick to quickly increase IAM, by brake boosting around 3-4k RPM a few times.

I set the initial to 1 (or 16) when tuning, but always starting from a safe timing map! After that it goes back to 0.5 (or 8)

On the rev limiter, it is 7000 from the factory on that motor/ecu.
I read about the quick way but as it's a new motor and my first timing tuning a Subaru I'd rather let the ecu decide for now. I have some knock -5 being corrected so I'll be smoothing that out today. It's only in 1 spot and I herd the ecu will learn to correct it but I'd rather have a solid map

IAM went to 9. So it's increasing slowly.
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Old 07-31-2012, 02:17 PM   #16
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If everything is kosher with your engine *which with -5 knock correction of some type means it's definitely not* Your IAM should advance up to 16 in a matter of minutes, not days. You need a pro tune asap.
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Old 07-31-2012, 03:37 PM   #17
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Quote:
Originally Posted by VFXWRX View Post
Your IAM should advance up to 16 in a matter of minutes, not days.
Only if you do the Vishnu reset or drive like a crazy person. If you drive normally it will take a while...easily a couple of days if you're not doing any long distance driving.
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Old 07-31-2012, 04:28 PM   #18
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Really? Mine regularly resets to 16 after driving like my grandma for 2 or 3 miles. Maybe an ecu difference between model years?
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Old 07-31-2012, 04:32 PM   #19
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Maybe, I've never played with the 16-bit ECU.

If it only took 2-3 miles, there would be no need for the Vishnu trick...because by the time you got out to a clear section of road to actually do it you'd already be at full timing
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Old 07-31-2012, 04:42 PM   #20
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Quote:
Originally Posted by the suicidal eggroll View Post
by the time you got out to a clear section of road to actually do it you'd already be at full timing
^^^This has been my experience. However most of the time I set the initial IAM to 12, so I suppose that speeds things up a little.
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