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 Old 06-30-2018, 08:09 PM   #1
 
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Default WOT KR with Stage 0 map?

Hello everyone I am new to the speed community. I have a 2012 Mazdaspeed 3 with 44k miles. I am currently experiencing 2-3 KR readings sometimes at WOT in 3rd gear or 4th gear pulls. My car is all stock except for a damond RMM, Cobb acessport and stage 0 tune.

attached are the 3 datalogs with the kr readings. Also the ambient temperature was 95 degrees fahrenheit on the day that I logged them.

About 5k miles ago I did not have these KR readings at WOT. And sometimes when I do another pull right after these readings show up my KR is fine all across the range.

should I be worried? Is my speed 3 okay? And should I get a compression check?
Attached Files
File Type: csv datalog5.csv (34.5 KB, 8 views)
File Type: csv datalog4.csv (22.1 KB, 4 views)
File Type: csv datalog3.csv (24.7 KB, 2 views)
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 Old 07-01-2018, 02:33 AM   #2
 
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AFRs in the 9s is way too rich. You should be seeing 11-12 at WOT. If you haven't changed your spark plugs yet, it sounds like it's about that time. Make sure they're gapped correctly. Also, it wouldn't hurt to clean your MAF sensor.
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 Old 07-01-2018, 05:19 AM   #3
 
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Originally Posted by Solarsurge View Post
AFRs in the 9s is way too rich. You should be seeing 11-12 at WOT. If you haven't changed your spark plugs yet, it sounds like it's about that time. Make sure they're gapped correctly. Also, it wouldn't hurt to clean your MAF sensor.
Thank you Solarsurge. I am going to try and clean my MAF sensor and see if my spark plugs are gapped correctly and what condition they are in.

Also I read somewhere that the stock mapping runs rich to be safe on the engine is that true?
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 Old 07-01-2018, 06:42 AM   #4
 
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11s are rich. 9s are black smoke out the exhaust and backfires rich.


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 Old 07-01-2018, 07:49 AM   #5
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Hot air+boost=knock. Also, knock retard + boost = low AFRs. The 9:1 AFRs are a reflection of the fact that you've got knock, and the car is attempting to compensate by adding fuel and pulling a boatload of timing.
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