View Poll Results: How do you deal with knock retard?
Left KR functions stock, don't know if it's pulling timing
7
12.28%
Left KR functions stock, and I know it's pulling timing
11
19.30%
Tried "mods" to deal with KR
21
36.84%
Turned KR off completely
18
31.58%
Voters: 57. You may not vote on this poll
Status of knock detection/retard on your LT1?
Registered User
Joined: Aug 2005
Posts: 4,405
From: Kantuckee Yo'
Re: Status of knock detection/retard on your LT1?
I guess I am lucky. I have nearly no KR according to my readings. Occasionally I will see a tad but never more than about 3 degree or so.
I do have a LT4 KM.
I do have a LT4 KM.
Registered User
Joined: Aug 2002
Posts: 2,325
From: BC
Re: Status of knock detection/retard on your LT1?
Mine is looking like a heat shield on the CAT right now or the shield around my manifolds. Both of those are going off when I get the MAC's in 
.So i'll find out if it was either of those. I can barely hear some vibrating metal of some sorts under the car when I accellerate which I'm guessing is what my false knock is.
Man, what a difference. I reduced the max retard WAY down (didn't have the ***** to zero it yet) and increased the attack rate a chunk too. My butt-o-meter definatly noticed a change at WOT
It's was still pulling timing (3° instead of 10-12° at WOT) so she still has a bit more in her.
.So i'll find out if it was either of those. I can barely hear some vibrating metal of some sorts under the car when I accellerate which I'm guessing is what my false knock is.Man, what a difference. I reduced the max retard WAY down (didn't have the ***** to zero it yet) and increased the attack rate a chunk too. My butt-o-meter definatly noticed a change at WOT
It's was still pulling timing (3° instead of 10-12° at WOT) so she still has a bit more in her.
Last edited by TobyZ28; Jul 9, 2006 at 01:28 PM.
Registered User
Joined: May 2006
Posts: 52
From: Round Rock, TX
Re: Status of knock detection/retard on your LT1?
Interesting. I have been watching my knock counts go up, but it never pulls timing. Running premium fuel, my motor sees 40+ degrees of timing at over 6500 revs on the dyno, producing 420 rwhp. I was told when I first installed my LT4 KM that you should run the heck out of the car for the first couple hundred miles to allow it to adjust. Maybe this is why. Dunno.
Last edited by String; Jul 9, 2006 at 09:29 PM.
Registered User
Joined: Dec 2005
Posts: 470
From: Chicago Suburbs
Re: Status of knock detection/retard on your LT1?
Originally Posted by String
Interesting. I have been watching my knock counts go up, but it never pulls timing. Running premium fuel, my motor sees 40+ degrees of timing at over 6500 revs on the dyno, producing 420 rwhp. I was told when I first installed my LT4 KM that you should run the heck out of the car for the first couple hundred miles to allow it to adjust. Maybe this is why. Dunno.
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Re: Status of knock detection/retard on your LT1?
Originally Posted by rskrause
I gained over 40rwhp when I did this and have not had detonation related problems to date.
Rich
Rich
Thread Starter
Moderator
Joined: Dec 1969
Posts: 10,745
From: Buffalo, New York
Re: Status of knock detection/retard on your LT1?
Originally Posted by Honda Hunter
How much knock was you reading to gain that much by removing it?
To put the 40hp in pespective, keep in mind this is a blower combo and the base timing was set at around 26 degrees at that time. It was pulling 8 or so degrees on top of that. Now, I run it at 24 degrees, where it makes max power.
Rich
Registered User
Joined: Oct 2002
Posts: 3,225
From: IN
Re: Status of knock detection/retard on your LT1?
I also have a blower car I am planning on having tuned later in the week, and am hoping for my LT4 KM along with my tuner to take care of any possible detonation.
Knowing my luck, if I turned it off, I would probably get detonation I wasn't aware of and end my newly refreshed motor.
Knowing my luck, if I turned it off, I would probably get detonation I wasn't aware of and end my newly refreshed motor.
Registered User
Joined: Mar 2002
Posts: 3,245
From: Ocala, Florida
Re: Status of knock detection/retard on your LT1?
When I had my car tuned he set the max KR to 4 degrees and made the decay rate alot faster, so even if I get KR it all goes away within a second, it doesn't take half an hour to go away like before.
*edit* It was definatly false knock to, there is no way I was getting 15 degrees of knock retard at part throttle at 2000 RPM's, or knock at idle. And with my mail order tune, for some reason he left the max knock to 15 degrees...
*edit* It was definatly false knock to, there is no way I was getting 15 degrees of knock retard at part throttle at 2000 RPM's, or knock at idle. And with my mail order tune, for some reason he left the max knock to 15 degrees...
Last edited by speed_demon24; Jul 10, 2006 at 01:36 PM.
Registered User
Joined: Nov 2003
Posts: 1,756
From: West Linn, OR
Re: Status of knock detection/retard on your LT1?
Originally Posted by Alvin@pcmforless.com
You guys can also desensitize them with programming.
Thats what I do.. Leave enough on the table to catch it if it does knock but remove the possilbity of the knock sensor cutting the cars throat if it gets tripped up too bad.
From my experience on earlier cars the knock sensor does work and its not very often that its totally false knock. Don't believe me? Get a car thats reporting a couple degrees of timing.. zero out all the tables make a pull on the dyno then tune the knock out and see if there is a difference in power.
Just because you can't hear the car pinging inside the car doesn't mean that its not.. Nor does it mean that its not too much timing already.. You don't tune timing by putting it in until you hear it.
Thats what I do.. Leave enough on the table to catch it if it does knock but remove the possilbity of the knock sensor cutting the cars throat if it gets tripped up too bad.
From my experience on earlier cars the knock sensor does work and its not very often that its totally false knock. Don't believe me? Get a car thats reporting a couple degrees of timing.. zero out all the tables make a pull on the dyno then tune the knock out and see if there is a difference in power.
Just because you can't hear the car pinging inside the car doesn't mean that its not.. Nor does it mean that its not too much timing already.. You don't tune timing by putting it in until you hear it.
Registered User
Joined: Jun 2005
Posts: 283
Re: Status of knock detection/retard on your LT1?
I am wondering if this could be my problem, had heads and cam put in, and all new valvetrain, didn't gain hardly any power. I have a autoxray handheld datalogger/scanner. it shows no knock retard, zero. could it be that my car is still seeing it, and that autoxray is not showing it? even when going wot it is not showing anything.. I have a madz28tune in there for now. Im not sure if he turned it off or what? but I am just trying to figure out my power loss.
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