KR/4 degrees: How much HP am I loosing?
02-02-2005, 11:32 AM
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KR/4 degrees: How much HP am I loosing? I think I fixed it, but won't be able to check for sure until tomorrow. I was wondering how much HP could it be robbing me off. Before my headers install I put on average 311 to the wheels. Done about 3 dyno sessions. I had a tube that was vibrating when I put the headers. We found KR after the header install also. I got what I think was causing it welded. After the header install 318 to the wheels. Going to dyno again before I install my cam and make sure the KR is gone.
http://macgyver.100free.com/AIRTUBE.jpg <---copy and paste for it to work.
http://macgyver.100free.com/AIRTUBE.jpg <---copy and paste for it to work.
Last edited by Magyver; 02-02-2005 at 12:19 PM.
02-02-2005, 11:47 AM
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You can check your KR without dynoing if you have A-tap or similar. Is KR only at WOT? What is your max timing? Don't know what it would be in HP, but I bet it's in the neiborhood of 10 HP or so depending on if it holds 4* of KR or that's just the max KR and drops. need to log some data..
Dan
Dan
02-02-2005, 11:54 AM
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Originally Posted by DanZ28
You can check your KR without dynoing if you have A-tap or similar. Is KR only at WOT? What is your max timing? Don't know what it would be in HP, but I bet it's in the neiborhood of 10 HP or so depending on if it holds 4* of KR or that's just the max KR and drops. need to log some data..
Dan
Dan
02-03-2005, 09:54 AM
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According to the stock PCM % Torque Loss vs Spark Retard
table (HPTuners 1.6) it's 1% at 6 degrees, I make it 0.4% at
4 degrees. Figuring 350 lb-ft of torque that would only be
1.4 lb-ft lost. But the table is not something I particularly
believe.
Thing is, if you are pinging (for real) you are well past best
torque timing and pulling back -could- actually help you.
But the knock retard is excessively jumpy and slow to
recover, often kicked in by transient throttle to mess up
your subsequent steady pull, and sometimes all about
false pickup.
What I've seen says, MBT timing is about 2 degrees less
than onset of ping. So if you were 2 degrees into ping
and pulled out 4, you'd be doing great. Not that the KR
setup can be counted on to put you there, properly.
table (HPTuners 1.6) it's 1% at 6 degrees, I make it 0.4% at
4 degrees. Figuring 350 lb-ft of torque that would only be
1.4 lb-ft lost. But the table is not something I particularly
believe.
Thing is, if you are pinging (for real) you are well past best
torque timing and pulling back -could- actually help you.
But the knock retard is excessively jumpy and slow to
recover, often kicked in by transient throttle to mess up
your subsequent steady pull, and sometimes all about
false pickup.
What I've seen says, MBT timing is about 2 degrees less
than onset of ping. So if you were 2 degrees into ping
and pulled out 4, you'd be doing great. Not that the KR
setup can be counted on to put you there, properly.
02-03-2005, 10:15 AM
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Originally Posted by jimmyblue
According to the stock PCM % Torque Loss vs Spark Retard
table (HPTuners 1.6) it's 1% at 6 degrees, I make it 0.4% at
4 degrees. Figuring 350 lb-ft of torque that would only be
1.4 lb-ft lost. But the table is not something I particularly
believe.
Thing is, if you are pinging (for real) you are well past best
torque timing and pulling back -could- actually help you.
But the knock retard is excessively jumpy and slow to
recover, often kicked in by transient throttle to mess up
your subsequent steady pull, and sometimes all about
false pickup.
What I've seen says, MBT timing is about 2 degrees less
than onset of ping. So if you were 2 degrees into ping
and pulled out 4, you'd be doing great. Not that the KR
setup can be counted on to put you there, properly.
table (HPTuners 1.6) it's 1% at 6 degrees, I make it 0.4% at
4 degrees. Figuring 350 lb-ft of torque that would only be
1.4 lb-ft lost. But the table is not something I particularly
believe.
Thing is, if you are pinging (for real) you are well past best
torque timing and pulling back -could- actually help you.
But the knock retard is excessively jumpy and slow to
recover, often kicked in by transient throttle to mess up
your subsequent steady pull, and sometimes all about
false pickup.
What I've seen says, MBT timing is about 2 degrees less
than onset of ping. So if you were 2 degrees into ping
and pulled out 4, you'd be doing great. Not that the KR
setup can be counted on to put you there, properly.
