Tuning out kr

Haedenjames

Haedenjames

Greenie N00B Member
Greenie Member
I have a speed6 with a remanufactured atk motor. Ever since I started breaking in the motor it has had crazy high kr at part throttle and won’t stop until I let off and 5.95 at wot consistently. Had the engine taken apart and checked and it is solid nothing is wrong. Knock sensor replaced and everything possible checked. The car ran fine prior to engine swap minus eating oil. My question is has anyone had this issue with a remanufactured motor and had their tuner fix it? And if so did it completely fix the kr? When I brought this up to my tuner prior to the new engine being pulled apart he said it was a bad idea but at this point I am out of options. I attached a wot log and a video of part throttle kr
 

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Tuners cant "fix" mechanical problems using a tune.

Have you tried using some e-85 (1 gallonish e-85 to a full tank of gasoline) to see if it affects how much knock is showing up in logs?
 
jsmith said:
Tuners cant "fix" mechanical problems using a tune.

Have you tried using some e-85 (1 gallonish e-85 to a full tank of gasoline) to see if it affects how much knock is showing up in logs?
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Yes I have tried e85 and the weird thing is it seemed to help in fact some pulls I would get 0 kr and the car would feel amazing but 1 out of 4 pulls the car would peg the knock sensor and hold until i let off. I could do a pull 2 seconds later and get 0. Without e85 it’s 5.95 every time. There’s a thread on here where a few people with remanufactured motors have had to tune around the same exact kr I’m having is it really impossible? Here’s the link and a screenshot of the exact post
https://mazdaspeeds.org/index.php?threads/issue-with-what-appears-to-be-phantom-kr.4334/page-2
 

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jsmith said:
"without e-85 its 5.95 every time" <-- that makes it sound like you have an actual issue. Are you just using shitty gas perhaps?
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No the gas is 91 and I have a buddy with a speed he runs the same gas and has no issues. If I flat foot it right at 3k rpms it makes it to redline with no knock. But if I’m at 4-5k and flat foot it, it pegs 5.95 every time regardless of e85. The part throttle kr is also not like the normal spikes it will hold 5.95 if I’m cruising and it will not stop until I let off. It’s almost like something is making noise in the head but Iv had it pulled by my mechanic and everything checks out. I don’t really know where to go from here other than numbing the knock sensor in those rpms it consistently reads kr in. If that’s even possible
 
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