Advance Mutiplier resetting on restart? - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MrSlay · 10-01-2013, 09:28 AM

Just logged a cold start and mine stays where its been set at 1.0. Drove about 100 miles on this current flash last night and IAM hasn't changed after the cold start this morning.

mad_sb · 10-01-2013, 01:10 PM

Quote:

Originally Posted by MrSlay

Just logged a cold start and mine stays where its been set at 1.0. Drove about 100 miles on this current flash last night and IAM hasn't changed after the cold start this morning.

what is the initial value in the rom set too?

If it is set to 1.0 in the rom, it will reset to 1.0 so you may still be seeing a reset and not notice it. If you ever notice the IAM having worked down to a value lower than 1.0 then you can check again. Or set it lower than 1 in the rom and see if it persists after it works up.

MrSlay · 10-01-2013, 05:16 PM

Quote:

Originally Posted by mad_sb

what is the initial value in the rom set too?

If it is set to 1.0 in the rom, it will reset to 1.0 so you may still be seeing a reset and not notice it. If you ever notice the IAM having worked down to a value lower than 1.0 then you can check again. Or set it lower than 1 in the rom and see if it persists after it works up.

I have it set at one and it's never changed. Even during the long drives yesterday, just stays at 1.0 Going to drive the car hard tonight and see what happens.

feldy · 10-01-2013, 05:27 PM

Here is mine from a drive home at lunch today. You can see that it was .94 whe car shut off and was there when I turned the key on. But it reset when I cranked the key.

King Tut · 10-01-2013, 05:31 PM

Can a mod move this to the tuning section? @Sportsguy83 can you page them again?

King Tut · 10-01-2013, 05:32 PM

Quote:

Originally Posted by MrSlay

I have it set at one and it's never changed. Even during the long drives yesterday, just stays at 1.0 Going to drive the car hard tonight and see what happens.

Did you see any Knock Correction or Knock Learning Value changes or did those remain zero the entire time?

Sportsguy83 · 10-01-2013, 05:38 PM

Quote:

Originally Posted by King Tut

Can a mod move this to the tuning section? @Sportsguy83 can you page them again?

I would if i could, but paged them.

MrSlay · 10-01-2013, 06:56 PM

Quote:

Originally Posted by King Tut

Did you see any Knock Correction or Knock Learning Value changes or did those remain zero the entire time?

The log this morning was just at idle, so no Knock Correction and not enough rpm to see any real difference in Knock Learning.

My Knock Correction Learning has never remained at zero. Below is a pic comparing a stock 2nd gear pull, to a 3rd gear that was done last night. The Knock Correction Learning curve is similar and the max variance in in correction is 1 even with the aggressive timing on e85.

Is everyone else seeing a similar curve?

mad_sb · 10-02-2013, 04:40 PM

Quote:

Originally Posted by MrSlay

I have it set at one and it's never changed. Even during the long drives yesterday, just stays at 1.0 Going to drive the car hard tonight and see what happens.

Right, that's a good thing, but not what we are talking about here.

Try setting the initial IAM to .7 or .8 flash the rom, drive around letting it work up to 1.0. Shut off the car, start it up again the following day and then see if the IAM is still at 1.0 or dropped back to what you set the initial value to in the rom.

mad_sb · 10-02-2013, 04:44 PM

[quote=MrSlay;1244686]The log this morning was just at idle, so no Knock Correction and not enough rpm to see any real difference in Knock Learning.

My Knock Correction Learning has never remained at zero. Below is a pic comparing a stock 2nd gear pull, to a 3rd gear that was done last night. The Knock Correction Learning curve is similar and the max variance in in correction is 1 even with the aggressive timing on e85.

Is everyone else seeing a similar curve?
...

The "curve" is equal to IAM * Ignition advance map for the most part. You will see some advance added and removed but you can't tell much of anything when the advance map is stock because it is all over the place.

Circuit Motorsports · 10-05-2013, 02:24 AM

After seeing this thread, I checked it out on our test BRZ premium (no push button). The IAM is persistent. This is EcuTek tuned.

Like mad_sb said earlier, having the car reset the IAM after each start is not how the Subaru knock system works. This is very much a Subaru ECU. Having the IAM reset after each start somewhat defeats the purpose of the system.

Why would you want the IAM to reset higher after a restart if the ecu had been seeing knock and had lowered the IAM to stop the knock? The IAM should always start where it left off and move up or down depending on how happy or unhappy the ecu is with regard to knock.

Sounds like the ECU is being reset after/during each startup, and may be a bug affecting only the FR-S.

I'll be tuning an FR-S tomorrow, I'll take note and post back.

-- Bob

Shiv@Openflash · 10-05-2013, 02:47 AM

FRS here. And IAM is definitely persistent.

Circuit Motorsports · 10-05-2013, 06:38 PM

The FR-S I just tuned resets the IAM back to the default value upon every startup. The IAM rises to 1 within seconds of the first decent acceleration.

-- Bob

AVOturboworld · 10-05-2013, 09:21 PM

I've extensively logged, flashed (110 times!), and logged some more on my turbocharged FR-S over the last 20,000 miles of turboboostin', and the IAM has never reset itself. None of the cars I've seen or flashed personally has reset either, FR-S or BRZ.

10-01-2013, 09:28 AM	#71
MrSlay Member Join Date: Jan 2012 Drives: Gx 460, FRS, Prius Location: Aventura FL Posts: 96 Thanks: 27 Thanked 29 Times in 20 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Just logged a cold start and mine stays where its been set at 1.0. Drove about 100 miles on this current flash last night and IAM hasn't changed after the cold start this morning. __________________ 15 FRS 12 Prius 12 ISF 15 Gx 460 My YouTube Channel

10-01-2013, 05:27 PM	#74
feldy Senior Member Join Date: Aug 2011 Drives: 2013 FRS Asphalt Location: SF Bay Area Posts: 1,155 Thanks: 309 Thanked 335 Times in 212 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	Here is mine from a drive home at lunch today. You can see that it was .94 whe car shut off and was there when I turned the key on. But it reset when I cranked the key. __________________ 2013 Scion FR-S AT Picked up 5/30/2012

10-01-2013, 05:31 PM	#75
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	Can a mod move this to the tuning section? @Sportsguy83 can you page them again? __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

10-02-2013, 04:44 PM	#80
mad_sb Senior Member Join Date: Jan 2013 Drives: 2013 Asphalt FR-S Location: Orange County Posts: 1,639 Thanks: 632 Thanked 982 Times in 537 Posts Mentioned: 100 Post(s) Tagged: 0 Thread(s)	[quote=MrSlay;1244686]The log this morning was just at idle, so no Knock Correction and not enough rpm to see any real difference in Knock Learning. My Knock Correction Learning has never remained at zero. Below is a pic comparing a stock 2nd gear pull, to a 3rd gear that was done last night. The Knock Correction Learning curve is similar and the max variance in in correction is 1 even with the aggressive timing on e85. Is everyone else seeing a similar curve? ... The "curve" is equal to IAM * Ignition advance map for the most part. You will see some advance added and removed but you can't tell much of anything when the advance map is stock because it is all over the place. __________________ ~Namaste~ 2013 Asphalt FRS

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10-05-2013, 02:24 AM	#81
Circuit Motorsports Senior Member Join Date: Jan 2012 Drives: 2013 Subaru BRZ Location: Orlando, FL Posts: 4,353 Thanks: 294 Thanked 495 Times in 259 Posts Mentioned: 35 Post(s) Tagged: 2 Thread(s)	After seeing this thread, I checked it out on our test BRZ premium (no push button). The IAM is persistent. This is EcuTek tuned. Like mad_sb said earlier, having the car reset the IAM after each start is not how the Subaru knock system works. This is very much a Subaru ECU. Having the IAM reset after each start somewhat defeats the purpose of the system. Why would you want the IAM to reset higher after a restart if the ecu had been seeing knock and had lowered the IAM to stop the knock? The IAM should always start where it left off and move up or down depending on how happy or unhappy the ecu is with regard to knock. Sounds like the ECU is being reset after/during each startup, and may be a bug affecting only the FR-S. I'll be tuning an FR-S tomorrow, I'll take note and post back. -- Bob

10-05-2013, 02:47 AM	#82
Shiv@Openflash Senior Member Join Date: Sep 2013 Drives: 2013 FRS Location: SF, CA Posts: 2,629 Thanks: 1,055 Thanked 5,470 Times in 1,494 Posts Mentioned: 605 Post(s) Tagged: 9 Thread(s)	FRS here. And IAM is definitely persistent.

10-05-2013, 06:38 PM	#83
Circuit Motorsports Senior Member Join Date: Jan 2012 Drives: 2013 Subaru BRZ Location: Orlando, FL Posts: 4,353 Thanks: 294 Thanked 495 Times in 259 Posts Mentioned: 35 Post(s) Tagged: 2 Thread(s)	The FR-S I just tuned resets the IAM back to the default value upon every startup. The IAM rises to 1 within seconds of the first decent acceleration. -- Bob

10-05-2013, 09:21 PM	#84
AVOturboworld Join Date: Jan 2012 Drives: 2013 "AVO Orange" FR-S Location: Seattle, WA Posts: 1,067 Thanks: 69 Thanked 2,277 Times in 636 Posts Mentioned: 108 Post(s) Tagged: 2 Thread(s)	I've extensively logged, flashed (110 times!), and logged some more on my turbocharged FR-S over the last 20,000 miles of turboboostin', and the IAM has never reset itself. None of the cars I've seen or flashed personally has reset either, FR-S or BRZ.

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