adeyspec
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« on: April 07, 2013, 01:53:43 PM »
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ok while logging whats acceptable amounts of timing pull as my car seems to be loving more and more of the stuff. im getting -4.5 briefly for about a few 100rpm when the boost comes in strong then the odd spike at 2ish higher up on 99 ron fuel.
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ddillenger
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« Reply #1 on: April 07, 2013, 01:59:22 PM »
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That's fine.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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adeyspec
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« Reply #2 on: April 07, 2013, 02:06:32 PM »
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So could I go for more? I should probably look at getting a graph plotted to show you all really.
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ddillenger
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« Reply #3 on: April 07, 2013, 02:14:09 PM »
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Logs would be good. Generally speaking, I shoot for CF's of 3 if running a consistent quality fuel. Anything over 5 I pull back timing. Sounds like you're in a good place.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
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Rick
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« Reply #4 on: April 07, 2013, 02:17:28 PM »
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Don't tune by CF's alone. You are generally looking for the most advanced timing with minimal oscillation.
Rick
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Snow Trooper
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« Reply #5 on: April 07, 2013, 04:58:44 PM »
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I shoot for as little correction as possible, ideally none.
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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jibberjive
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« Reply #6 on: April 07, 2013, 11:43:38 PM »
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Does everyone commenting in this thread run completely unmodified knock based corrections sensitivity maps?
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ddillenger
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« Reply #7 on: April 07, 2013, 11:53:53 PM »
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I can't comment for everyone else, but I haven't changed knock hysteresis.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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adeyspec
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« Reply #8 on: April 08, 2013, 02:28:37 AM »
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neither have i
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NOTORIOUS VR
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« Reply #9 on: April 08, 2013, 05:40:31 AM »
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I don't see the point in changing any knock tables
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phila_dot
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« Reply #10 on: April 08, 2013, 06:31:08 AM »
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IMO, the goal is to find the knock border. I shoot for no KR under most conditions with a blip of activity occasionally. With 3-5* retard I will start at the onset of knock and pull 1.5* in that cell only and blend it out if necessary. This will usually bring me down to zero KR or at least move it up a good bit. Repeat if needed.
I don't touch anything KR related except disabling adaptation during tuning.
Edit: I should clarify, this only applies when street tuning a knock limited application
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« Last Edit: April 09, 2013, 04:54:56 AM by phila_dot »
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Snow Trooper
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« Reply #11 on: April 11, 2013, 12:52:27 PM »
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i speed up recovery a little bit
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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jibberjive
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« Reply #12 on: April 11, 2013, 08:13:11 PM »
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IMO, the goal is to find the knock border. I shoot for no KR under most conditions with a blip of activity occasionally. With 3-5* retard I will start at the onset of knock and pull 1.5* in that cell only and blend it out if necessary. This will usually bring me down to zero KR or at least move it up a good bit. Repeat if needed.
With this approach, since you're focusing on pretty much one cell at a time, do you do similar pulls in all of the gears? How about something like 3/4 WOT pulls to get the other cells? With literally zero corrections, do you worry that you're leaving some power on the table? |
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phila_dot
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« Reply #13 on: April 12, 2013, 05:09:00 AM »
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With this approach, since you're focusing on pretty much one cell at a time, do you do similar pulls in all of the gears? How about something like 3/4 WOT pulls to get the other cells? With literally zero corrections, do you worry that you're leaving some power on the table?
I don't tune FATS pulls. I try to get all driving conditions covered in my logs. Therefore, it really won't be one cell at a time, more like the whole map. When knocking occurs, I focus on the one cell that triggered the KR. I shouldn't really say one cell because the adjoining cells have to be considered as well and any blending out needs to be done also. My overall timing is more advanced with zero KR than with more advanced desired timing and KR. There will be blips of KR occasionally because I'm riding the border, but never continuous knock. |
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prj
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« Reply #14 on: April 12, 2013, 05:27:28 AM »
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I think you guys assume too much that all cylinders are equal.
They are not.
And if you don't have any timing pull, you are losing power, as some cylinders can easily have 3-4 deg more advanced timing.
Tested this on dyno as well, and everything is as expected.
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