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Old 07-06-2014, 01:25 PM   #1
xgotboostx
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Default Roughness Cyl Count

Hey guys,

2013 WRX with 14,000 miles. Engine is all stock with Group N motor mounts, and Turbo Blanket.

I've been recently getting 1 count of Roughness Cyl. It doesn't happen often. I can go on a long drive with all Roughness Cyl at 0, and some other drives I get 1 count in either cylinder. It's happened on all cylinders, but not all at the same time and only for a split second or very short period of time. It only happens in idle or with the car in 1st cruising in a parking lot. Never on the highway or city driving. It has also never thrown a CEL and doesn't idle rough. RPM idles at 750. Idle vacuum is always at 20Hg.

Datalog (highlighted concerning areas. It starts at the 13 second mark and another roughness count on the 300 second mark):
https://docs.google.com/spreadsheets...it?usp=sharing

I'm using a 2nd revision of Eric's TP tune. I noticed it runs richer compared to the 1st TP tune. I sent the data logs to him and waiting for a reply. How common are these minor misfires on a WRX? Does it happen from time to time and is it something to be concerned about? Can it also be weather related or gas? I always fill up with Chevron 91 (Nevada gas). It only seemed to happen when I switched to the 2nd revision so could it possibly be tune related? Hopefully Eric can sort it out.
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Old 07-06-2014, 01:42 PM   #2
danny_d19
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Pretty normal
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Old 07-06-2014, 07:56 PM   #3
xgotboostx
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Originally Posted by danny_d19 View Post
Pretty normal
Even for a 2013 WRX? Is it fairly normal with these cars? Hasn't thrown a CEL and no codes being read on the AP and the count is always 1 at idle / very low loads like 1st gear cruising through a parking lot. Or am I just being paranoid with all this data log analyzing?
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Old 07-06-2014, 10:56 PM   #4
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Even a perfect running car can have small roughness counts, as far as I've read. If the count goes higher then I'd look into it
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Old 07-07-2014, 09:03 AM   #5
wgr73
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Quote:
Originally Posted by xgotboostx View Post
Even for a 2013 WRX? Is it fairly normal with these cars? Hasn't thrown a CEL and no codes being read on the AP and the count is always 1 at idle / very low loads like 1st gear cruising through a parking lot. Or am I just being paranoid with all this data log analyzing?
The reason it's not throwing a CEL is because you haven't reached the roughness count threshold. If you look in atr you'll see there are parameters you can adjust for the cel to set in relation to roughness.

Don't worry about it.
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Old 07-08-2014, 03:10 PM   #6
xgotboostx
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Ok, I guess Roughness monitors are like Knock Sums. They cause nothing more than the urge to pull your hair out.

I've also read horizontally opposed engines normally have roughness and is part of the characteristic of a boxer engine. Not sure if that's true.

As long as it's normal or I am just over analyzing these logs?

I should just pay attention to Knock Feedback Correction and Fine Knock Learning and stop looking at other pointless monitors otherwise I'll end up worrying about stupid little things.
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Old 07-09-2014, 10:32 AM   #7
wgr73
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Quote:
Originally Posted by xgotboostx View Post
Ok, I guess Roughness monitors are like Knock Sums. They cause nothing more than the urge to pull your hair out.

I've also read horizontally opposed engines normally have roughness and is part of the characteristic of a boxer engine. Not sure if that's true.

As long as it's normal or I am just over analyzing these logs?

I should just pay attention to Knock Feedback Correction and Fine Knock Learning and stop looking at other pointless monitors otherwise I'll end up worrying about stupid little things.
Roughness (misfire) is useful. Knock sum is something that most don't pay attention to unless they suspect a problem. So if the car is shaking/stumbling at idle, I'd log roughness to see if I'm misfiring. You can feel/hear a misfire, so it is something you should be concerned about if you hear it.
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Old 07-11-2014, 01:23 AM   #8
Tanner0613
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I've got cylinder roughness going up to 6 in cylinder 1 and roughness going to 3 in cylinder 3 at idle with a rough idle. Ideas or thoughts?
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Old 07-11-2014, 01:30 PM   #9
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Quote:
Originally Posted by Tanner0613 View Post
I've got cylinder roughness going up to 6 in cylinder 1 and roughness going to 3 in cylinder 3 at idle with a rough idle. Ideas or thoughts?
http://forums.nasioc.com/forums/show....php?t=2318069
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Old 12-03-2017, 01:14 PM   #10
jaxx4k
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my roughness counts goes from 5/7/2/2/1/18/7/9/8. new plugs, new coil pack, new engine harness still does the same.
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Old 01-13-2018, 07:44 PM   #11
element91
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Any one know what is the trigger value for a roughness count to turn into a misfire code? also the Cobb AP labels them as "Count" and it seams that you have to exceed the stored value for a new value to be displayed as "Max"

The way I interoperate this is more of a level of roughness not as much a cumulative counting

can anyone speak to a acceptable roughness count on a forged piston engine?

Matt
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Old 02-01-2018, 11:26 PM   #12
element91
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Update :
determined that my Evap hose routing at the mainfold was creating a vac leak only when the ECU was activating the evap purge valve, hence light throttle momentary lean condition misfire.

Roughness count = 0

Ready for Dyno~ whew
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