How to see KR without a knock sensor

[we4Mateo]

When tuning a car without a knock sensor, what on the logs would indicate KR? Flutters in the AFR?

Just curious what the big dogs look for when trying to lean out a car or add or decrease timing without a knock sensor but with good logging software.

 

[notacarlo]

Extremely lean spikes on the AF. Without a sensor and supporting ecu this spells danger.

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[we4Mateo]

Extremely lean spikes on the AF. Without a sensor and supporting ecu this spells danger.

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Agreed! Fast ECM but no knock sensor. Wideband feedback and everything, but just curious what all parameters would be off with KR.

 

[notacarlo]

I think just Afr. There's nothing telling the system to pull timing during detonation. So nothing else would show the "tickle".

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[we4Mateo]

Thanks.

 

[HighPSI]

If you are running a vacuum pump, you will see crankcase vacuum drop.

 

[notacarlo]

Didn't think about that. But if my math is right you are correct.

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[notacarlo]

Even under boost?

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[HighPSI]

If you are addressing me, then yes, even under boost provided your pump is keeping up

 

[delcowizzid]

buy a cheap personal amplifier and make some knock ears is a cheap solution http://www.autospeed.com/cms/article.html?&A=0353 works great for $15 or less

 

[notacarlo]

If you are addressing me, then yes, even under boost provided your pump is keeping up

Gotcha. Makes sense to me.

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[TurboBuRick]

Just curious. What management system are you using?

 

[notacarlo]

FAST ecu. so there should be provisions for a sensor no?

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[HighPSI]

The classic fast doesn't have provisions to read any external analog inputs. So you can't monitor crankcase vacuum like an XFI

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[Rustyregal]

Does FAST XFI utilize thw factory knock sensor? If not Cal do you feel it is effective at detecting knock?

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[Jerryl]

Trying to learn.
Cal, can you explain the vacuum drop?

 

[HighPSI]

When you get detonation, the rings will flutter and crankcase vacuum will rise. This is not to be confused with manifold vacuum

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[HighPSI]

Does FAST XFI utilize thw factory knock sensor? If not Cal do you feel it is effective at detecting knock?

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Yes it does, and you can program the maximum retard, esc attack rate, and esc decay rate

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[Rustyregal]

Oh yeah, I fall deeper in love with it everyday! If she just wasn't such an expensive date.

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[HighPSI]

Lol! I understand.

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