PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

is there always going to be some knock retard?

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Old Apr 14, 2008 | 11:53 AM
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Default is there always going to be some knock retard?

ok i have been tuning on my car for a while and always seems to be a spot where the pcm is pulling a little timing.Do i really need to get rid off all knock retard? just curious because i know valvetrain and loud exhaust is supposed to cause a little false knock. what are you guys doing out there on this subject?
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Old Apr 14, 2008 | 12:19 PM
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I don't worry about just a little because there are more things that can cause it than just having too much timing. Could have a bad batch of gas maybe
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Old Apr 14, 2008 | 06:16 PM
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Ok then , what is an acceptable level of KR?
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Old Apr 14, 2008 | 07:16 PM
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well I myself don't really know but the tuner that done my car said I had about .5 to 1.0 and he said that was really good.
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Old Apr 14, 2008 | 08:09 PM
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ok thats about what i was thinking was normal ..just wanted another opinion other than myself . thanks
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Old Apr 14, 2008 | 09:56 PM
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Originally Posted by lt170chevelle
Ok then , what is an acceptable level of KR?
Assuming it is real none. If you have a part throttle knock it is still going to be there when you go WOT.
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Old Apr 15, 2008 | 05:07 AM
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No knock is acceptable. However you will get the odd tick now and again. The main thing is that the KR is not like a saw tooth meaning constant knock is detected. I used to get zero most of the time with the odd little 1-2 deg under throttle transitions.
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Old Apr 15, 2008 | 05:28 AM
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Do any GM PCM's use individual cylinder knock retard?

How many GM tuners ignore the knock sensor?

Ford does not use knock sensors on their performance engines, including the factory supercharged ones. I make these systems for many applications, but cannot break through to the Ford community.

As far as I know, none of the Ford guys even listen to a knock sensor on the dyno.

Here's a quote from a Ford tuner, regarding my system:

From a safety standpoint its a great idea/unit, but IMHO I'm not sure that its a benefit from a performance enhancing standpoint.
From one of the "go to guys" on a Ford forum:
I don't understand the benefit of adding a crutch to prevent damage that results from improper tuning. When proper tuning and setup is combined failures rarely result.
I would appreciate any insight, but please refrain from bashing the Ford guys.
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Old Apr 15, 2008 | 08:23 AM
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Not that the questions you're asking really pertain to this thread at all, but...

No, GM does not have individual KR sensors / cylinder.

I would guess that NO tuner would ignore KR data as it's a pretty clear indication that there is something wrong in your tune...

HTH,
-Eagle
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Old Apr 15, 2008 | 12:01 PM
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Originally Posted by John at J&S
Do any GM PCM's use individual cylinder knock retard?

How many GM tuners ignore the knock sensor?

Ford does not use knock sensors on their performance engines, including the factory supercharged ones. I make these systems for many applications, but cannot break through to the Ford community.

As far as I know, none of the Ford guys even listen to a knock sensor on the dyno.

Here's a quote from a Ford tuner, regarding my system:



From one of the "go to guys" on a Ford forum:


I would appreciate any insight, but please refrain from bashing the Ford guys.

I find that odd. Thank you for that info. Should I ever get a Ford and tune it I will have that in mind.

I mean a non performance low compression motor can knock through out its whole life with no issues as it makes no power. But a performance engine... man I wouldn't run w/o knock sensors in a production performance engine and warranty it!
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