I have KR from a Roll.
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From: Shelby Twp. Mich
I have KR from a Roll. I am experiencing something I havent seen before.I nail it from a 40-45 mph roll I get instant 3-4 degrees of KR ,I nail it again 1 degree of KR then Nail it again 3-4 degrees of KR,I am Like WTF!!!! What could this be?
Burst knock. I increased the intial duration of burst knock control in the pcm and it's all gone for the most part. I think the factory setting was 3 crankshaft rotations. I upped it to 60 or so, which is still a very short period of time. I also chopped the decay rate in half (was 25, now 12.5).
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From: Shelby Twp. Mich
SSpdDmon I have a 99 ,in my HPT Im not showing what your telling me?I have 2 Burst Knock catagories 1 is Burst Knock Enable Delta Cyl Air Threshold vs. Rpm and 2 is Burst knock Retard vs RPM
Last edited by Pro Mouse; Jul 1, 2007 at 10:22 PM.
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Originally Posted by Pro Mouse
Can I set my Burst knock to 0 ?Is it necessary to Have?
Try adding .02 across the table of the stock numbers.
To get rid of it 8 across the table
Burst knock retard
enable delta cyl air
Is it necessary? I think its for gas saveing.
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Originally Posted by Pro Mouse
SSpdDmon I have a 99 ,in my HPT Im not showing what your telling me?I have 2 Burst Knock catagories 1 is Burst Knock Enable Delta Cyl Air Threshold vs. Rpm and 2 is Burst knock Retard vs RPM
Wow....that sounded bad. I am talking about timing...I promise.
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From: Shelby Twp. Mich
Originally Posted by dc96819
Try adding .02 across the table of the stock numbers.
To get rid of it 8 across the table
Burst knock retard
enable delta cyl air
Is it necessary? I think its for gas saveing.
To get rid of it 8 across the table
Burst knock retard
enable delta cyl air
Is it necessary? I think its for gas saveing.
Thanks
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From: Shelby Twp. Mich
Originally Posted by SSpdDmon
These tell when and how much to pull out. I'm talking about the settings that say how long to pull it out for and how fast to put it back in.
Wow....that sounded bad. I am talking about timing...I promise.
Wow....that sounded bad. I am talking about timing...I promise.
Recovery rate sounds right. That should be set to something like .25 from the factory. I chopped it in half and will probably end up leaving it at .10 when I'm done. The other setting was a delay. This was one cell in my software that said....wait 'x' crankshaft revolutions before using the above decay rate. It shouldn't have anything to do with ECT.
My understanding is, Burst Knock tables exist because spark will arive faster than fuel. So when you mash the gas, you need to tell the spark to hold off a split second. If you increase the delta too much, you're effectively disabling Burst Knock Retard. I think it's a good thing to have. Too much and it'll make tip in feel like a slug though. But, just enough to keep the knock sensors happy is definitely ok. If you set the delay I'm talking about to somewhere in the range of 50~80 crank revolutions, it's less than a tenth of a second that the initial timing is pulled. Real knock retard doesn't recover as fast as burst knock. So, if it's knocking more often than not on tip in, the car will actually perform slightly slower off the punch more often than not when the knock sensors are tripped.
My understanding is, Burst Knock tables exist because spark will arive faster than fuel. So when you mash the gas, you need to tell the spark to hold off a split second. If you increase the delta too much, you're effectively disabling Burst Knock Retard. I think it's a good thing to have. Too much and it'll make tip in feel like a slug though. But, just enough to keep the knock sensors happy is definitely ok. If you set the delay I'm talking about to somewhere in the range of 50~80 crank revolutions, it's less than a tenth of a second that the initial timing is pulled. Real knock retard doesn't recover as fast as burst knock. So, if it's knocking more often than not on tip in, the car will actually perform slightly slower off the punch more often than not when the knock sensors are tripped.
Originally Posted by dc96819
I would Keep adding .02 till it goes away.