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Too much timing? Need opinions.

 
Old 10-19-2012, 12:21 AM
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Default Too much timing? Need opinions.

Hey all, need someone to check out my timing map. I'm picking up knock above 4500 when I go WOT, from what I can tell when I go WOT in a higher RPM area (4.5k, 5.5k, 6.5k) and run to redline I pick up knock. I make very good power if there's no knock event (VERY good, actually). Go figure. The turbo is currently being stretched to it's limits, I imagine the 2560 is beyond maxed when it spikes to 18psi. I would very much like to switch from MBC to EBC, but alas it hasn't been fixed yet.

However, if I'm WOT from 3k-redline, there's no knock issue. I need an opinion on my timing map, if anyone has a chance to take a look. I'm hitting 11.3-11.5:1 for AFR during most cases. The only cases I am not keeping up is rapid switching between WOT and off. I have the knock sensor calibrated with a reasonable amount of breathing room, but it's possible I might have it too close. In any case, opinions?

Edit- Off the wastegate I see 14.5psi max and maintain 13-14psi without any knock events. And this is flooring it from 4, 5 and 6k to redline going from vac to 14psi.
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Last edited by Der_Idiot; 10-19-2012 at 01:23 AM.
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Old 10-19-2012, 07:11 PM
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Anyone able to chime in?
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Old 10-19-2012, 07:24 PM
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Life is too short to load the Hydra software, post a screen-cap. If you experience detonation and you're hitting AFR targets, you should probably pull spark, lol.
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Old 10-19-2012, 07:56 PM
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I'd bet $10 that you're getting tip-in knock due to boost overshoot. Flooring it from 3k doesn't allow the same overshoot, which means no knock.

My suggestion would be to switch to an ECU that has working EBC.
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Old 10-19-2012, 09:13 PM
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^ That's possible. I'm not getting the issue with it if I go off WG pressure. I gotta look into how to re-enable it on 2.7 and test how it's working, but in the mean time here's my timing map in beautiful JPG format.

On a side note, they made an option to export maps to CSV and BMP, but the bmp spits out the map itself and not the timing table.
Attached Thumbnails Too much timing? Need opinions.-timing-map.jpg  
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Old 12-26-2012, 11:21 AM
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Originally Posted by Savington View Post
I'd bet $10 that you're getting tip-in knock due to boost overshoot. Flooring it from 3k doesn't allow the same overshoot, which means no knock.

My suggestion would be to switch to an ECU that has working EBC.
Likely. Switching ECUs is expensive and time consuming. Getting a standalone EBC would be an option. AS Sav is an AEM fan, they have a good one available.

Last edited by vtjballeng; 12-27-2012 at 09:32 AM.
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Old 12-26-2012, 11:34 AM
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I'm with sav: tip in and/or overshoot knock
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Old 12-27-2012, 02:47 AM
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Der. Your timing map is fairly conservative. Do you only have 91oct?

Do a log with knock trim. It will be obvious after that. Post it.
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