Knock retard horsepower equivalent?
Thread Starter
Registered User
Joined: Mar 2002
Posts: 1,842
From: Bloomfield Hills MI
Knock retard horsepower equivalent?
Im wondering how much power (roughly) does 3 degree of knock retard do to an engine. I am just curious what 3.3 degrees of knock retard is doing to my horsepower...
Registered User
Joined: Oct 1999
Posts: 3,531
From: Battle Creek, MI
dunno...I figured around 3 or 4hp per degree. Diffeence on a dyno betwen 36 and 39 degrees advance on a dyno could very well be 12hp... but it depends on the engine and if it can use the extra advance. It would probably be better expressed as a percentage rather than a hard number...
Registered User
Joined: Nov 2001
Posts: 3,515
From: Kansas
well i can tell you a 10 degree drop is a difference you can actually feel... youd never feel 3 degrees. and at the track im sure your car would run pretty much the same if you take out the inconsistent driver factor.
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
1 degree could be 2-3 RWHP. I dealt with knock so much that I could tell when my car was getting 3-4 degrees for a longer period of time (at least 5-6 seconds). Verified while someone else was looking at the laptop! 
Registered User
Joined: Feb 2001
Posts: 34
From: T-Dot Canada
Originally posted by madwolf
1 degree could be 2-3 RWHP. I dealt with knock so much that I could tell when my car was getting 3-4 degrees for a longer period of time (at least 5-6 seconds). Verified while someone else was looking at the laptop!
1 degree could be 2-3 RWHP. I dealt with knock so much that I could tell when my car was getting 3-4 degrees for a longer period of time (at least 5-6 seconds). Verified while someone else was looking at the laptop!
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Originally posted by Rodrigues
I ordered a LT4 KM, wont be here for a while though...
I ordered a LT4 KM, wont be here for a while though...
So I just desensitized it through programming and it ran much better since.
Registered User
Joined: Oct 2001
Posts: 1,462
From: smog zone adjacent to a great lake
Just an observation here. Sounds like Madwolf took care of the problem with programming. If that is the case, it APPEARS to have been false knock. In that case, Madwolf did not cure the cause of the false knock. In his defense, depending on the bolt on add ons (headers for instance?), the false knock may be an unwanted but included extra with the bolt ons, making the cure of lesser importance.
Registered User
Joined: Dec 1999
Posts: 1,697
From: Petersham, MA
Actually,to my surprise, the LT4 KM helped a TON! I was seeing 20* of retard!
It was about 12* at WOT and now I'm seeing 33* after just the LT4 KM. That is a tremendous amount of power that I was never seeing.
It was about 12* at WOT and now I'm seeing 33* after just the LT4 KM. That is a tremendous amount of power that I was never seeing.
Thread Starter
Registered User
Joined: Mar 2002
Posts: 1,842
From: Bloomfield Hills MI
I set a cap on my knock retard at 7/5 degrees depending on MAP pressure and RPM. I could just set them all to 0 but I would fear real knock ruining my engine. I can't hear or have never heard any real knock but I want my engine to last.