Maximum knock recovery rate?
Thread Starter
Launching!
Joined: May 2003
Posts: 290
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From: Canadian West Coast
Maximum knock recovery rate? In the Decay vs RPM, what is the max recovery rate? Anyone tried much over 100%, say 200%?
Reason I ask is becuz the stock recovery settings are pretty slow, and when I raise them to 100%, the improvement is marginal at best. How high have you gone?
Reason I ask is becuz the stock recovery settings are pretty slow, and when I raise them to 100%, the improvement is marginal at best. How high have you gone?
I have recovery rates at 0.25 which makes the KR
event fade pretty quick. That's good for when you
have KR coming off transient events though it means
you will be more prone to stay in light ping if you have
a persistent trigger. If the KR doesn't go away in 4-8
frames then you probably have continuous knock hits
propping it up.
event fade pretty quick. That's good for when you
have KR coming off transient events though it means
you will be more prone to stay in light ping if you have
a persistent trigger. If the KR doesn't go away in 4-8
frames then you probably have continuous knock hits
propping it up.
Thread Starter
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
I'm not sure I quite follow what you mean by setting at 0.25. Do you mean 250% is what the rate is set at? Pehaps I don't understand my own question well enough.
The Knock Fast Recovery table (decay vs rpm), if I understand it, is a percentage multiplier for restoring timing once an instance of knock has occurred, and that the higher the percentage, the faster timing is restored. The stock settings are around 60-80% (if I recall), which recovers slowly - but if you were to increase the values TO say 150%, timing would be restored much sooner.
Either I misunderstand the table (which I may) or I don't know how the 0.25 would factor in. Wouldn't that make recovery slower? Unless you mean 250%.
OR,
Are you referring to the Attack vs RPM table (the knock fast attack rate)?
The Knock Fast Recovery table (decay vs rpm), if I understand it, is a percentage multiplier for restoring timing once an instance of knock has occurred, and that the higher the percentage, the faster timing is restored. The stock settings are around 60-80% (if I recall), which recovers slowly - but if you were to increase the values TO say 150%, timing would be restored much sooner.
Either I misunderstand the table (which I may) or I don't know how the 0.25 would factor in. Wouldn't that make recovery slower? Unless you mean 250%.
OR,
Are you referring to the Attack vs RPM table (the knock fast attack rate)?
Last edited by Camaro ChriSS; May 8, 2005 at 01:04 PM.
Thread Starter
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
Ok, that's intersting. How quick does KR recover for you? At 100%, I find that say 2.0 degrees in 3rd gear at 4500 rpm would still take till almost 6000 rpm to go away.
I was thinking of trying around 150-200% recovery rate, but wondering if it could cause any problems going to 200.
I was thinking of trying around 150-200% recovery rate, but wondering if it could cause any problems going to 200.
In my version of HPTuners the table is decimal, not percent.
The factory tune had 0.013 (0.0125?) from 3600RPM on up
with slightly increasing values as you go lower. I upped this
to 0.1, then 0.2, now 0.25 with no ill effect but a tendency
to "skip along the ping surface" if the gas is bad or the tune
is too aggessive. That is, if you do have too much advance
the KR won't stick around, it will find ping again shortly.
I also decreased the fast attack rate by a factor of 4.
The factory tune had 0.013 (0.0125?) from 3600RPM on up
with slightly increasing values as you go lower. I upped this
to 0.1, then 0.2, now 0.25 with no ill effect but a tendency
to "skip along the ping surface" if the gas is bad or the tune
is too aggessive. That is, if you do have too much advance
the KR won't stick around, it will find ping again shortly.
I also decreased the fast attack rate by a factor of 4.
