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Old 07-21-2009, 12:07 PM   #1
sen7inel
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Default Opinion on log and where do I go from here?

Hey guys I'm still new to this stuff, lurking and reading LOTS mostly. I've been attempting to fine-tune Bullwinkle's GMBCS Stage 2 map to my setup. My mods are: Bosal shorty dp with STI cat, STI axleback, STI TMIC and of course the GMBCS.

LOG: (multipurpose, sorry for all these parameters)
http://spreadsheets.google.com/pub?k...=0&output=html

Learning View:


Now to the questions:

1. I've noticed some knock down low in the log and pulled almost 2* of timing in that area but it seems unchanged?

2. The IAM was 1 before I pulled the timing, now .9375. Why?

3. Learning view is showing FLKC timing adding timing, while the log clearly shows timing being pulled in these areas? What gives?

4. Where do I go form here? What should I fine tune, what can I improve in my tune?

I still have a lot of learning to do but am really trying. Constructive criticism, opinions in general, anything welcome.
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Old 07-22-2009, 12:32 AM   #2
NSFW
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IAM went down because the ECU saw enough knock in enough areas that it decided to decrease timing across the board (that's what IAM does). Basically, it thinks you've accidentally filled it up with 87 octane.

When IAM is less than 1, FLKC can add timing. Think of it as the ECU "testing the waters" to see if it's safe to raise IAM a notch.

Timing is being pulled. With IAM less than 1, you may be running less than full advance even when FLKC is positive. FLKC just isn't positive enough to make up for the drop in IAM.

Total timing = base_timing + (IAM * timing_advance) + FLKC + FBKC

You should decrease timing in the regions where the log showed knock. Look for random peaks in the timing tables in those areas and cut them down if you see them.

Here's a utility that you can use with RomRaider to visualize and tweak the total timing:
http://www.romraider.com/forum/topic4439.html
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Old 07-22-2009, 09:21 AM   #3
sen7inel
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Many thanks!
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Old 07-26-2009, 07:55 PM   #4
sen7inel
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Update:

On a hunch I ran the tank almost dry and decided to fill up with Shell instead of no name premium. Results after half week of driving:



No change to my tune whatsoever. All I did is reset the ecu. Moral of the story: Don't cheap out on gas.
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Old 07-26-2009, 11:29 PM   #5
NSFW
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Cool.
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Old 08-02-2009, 09:46 PM   #6
jarencibia
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I only use shell and exxon gasoline in new jersey because just about everything else has 10% ethanol in it. If you look on the pumps the cheaper premium has a label that says "contains 10% ethanol". You could tune for the e10 premium.
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Old 08-02-2009, 11:03 PM   #7
wrxsti.l
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The biggest problem with any ethanol mixes (E10, E85 or anything else) is the consistency of the fuel. It changes so rapidly between tanks that A/F learning can and does jump anywhere upto +-10% (could even be higher for some cheaper mixes) and octane can drop by just as much - which inturn decreases your knock threshold and your engine starts to knock.

If possible, always use quality fuel and if you want to run an ethanol mix, either order it in barrels (which will have a printout of fuel spec and quality) or make sure that you do a lot of road tuning over several tanks of gas so your tune can take into consideration the fuel quality as well.

You may end up having to run a tune with slightly less timing and/or boost and make a little less power overall so you don't knock with a crap batch of fuel, but at least your engine won't die.

Leslie.
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Old 08-03-2009, 01:19 AM   #8
69subaru360
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The 93 octane E10 we get here is really good stuff. I have great results with it, it's very knock resistant. But it can vary in quality. On E10 I'm happy if my fuel learning stays within 10% tank to tank. That's what learning is there for, differing fuel quality. On straight gasoline I try to keep learning within 5%. Some people shoot for 2% but that can be difficult.
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Old 08-03-2009, 01:33 AM   #9
wrxsti.l
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Quote:
Originally Posted by 69subaru360 View Post
The 93 octane E10 we get here is really good stuff. I have great results with it, it's very knock resistant. But it can vary in quality.
Don't get me wrong, I am not saying E10 is a poor performer, I have had great results using it - I just wanted to point out it has quality issues and your tune should factor that in for engine longevity

Quote:
Originally Posted by 69subaru360 View Post
On E10 I'm happy if my fuel learning stays within 10% tank to tank. That's what learning is there for, differing fuel quality. On straight gasoline I try to keep learning within 5%.
5% min is what you want. 10% is too high and you are sacrificing a lot of your headroom and limiting your margin of safety.

Quote:
Originally Posted by 69subaru360 View Post
Some people shoot for 2% but that can be difficult.
On E10 I had around <2%, on straight pump I have <1% - and that is with non-standard larger injectors

It is all in the tune. Spend a little time on it and less than 5% is not that hard - even with inconsistencies in fuel quality.

Leslie
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Old 08-03-2009, 01:48 AM   #10
69subaru360
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Quote:
Originally Posted by wrxsti.l View Post
Don't get me wrong, I am not saying E10 is a poor performer, I have had great results using it - I just wanted to point out it has quality issues and your tune should factor that in for engine longevity


5% min is what you want. 10% is too high and you are sacrificing a lot of your headroom and limiting your margin of safety.


On E10 I had around <2%, on straight pump I have <1% - and that is with non-standard larger injectors

It is all in the tune. Spend a little time on it and less than 5% is not that hard - even with inconsistencies in fuel quality.

Leslie

You're right of course but it's tough when you travel a lot and are filling up at unknown stations. When I use the same station all the time I can keep it much closer to zero.
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Old 08-03-2009, 03:07 AM   #11
wrxsti.l
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Yeah, very true. I use the same gas station every time. On the odd occasion I get stuck out somewhere too far away and fill up with I notice my A/F learning change quite a bit.

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