some knock part throttle, wot, but everything else looks ok??
05-17-2005, 09:06 PM
#1
some knock part throttle, wot, but everything else looks ok?? im trying to help someone out with their tune and i have yet to encounter any part throttle knock on my car or anything like this. part throttle he is getting some knock, so i would assume i have to increase the burst knock delta air tables, but by how much?? and at WOT the mV on the o2s look pretty good, about 920 (on stock manifolds), fuel trims are all zeroed out, everythign else seems to be ok, i just dont know why it would knock, its a 2000. any ideas, problem with teh car or tune?
05-17-2005, 09:26 PM
#2
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might also want to check the afr timing tables. I was getting 2-3 extra degrees on part throttle casuning me some Knock retard.
Last edited by JoeyGC5; 05-18-2005 at 05:58 AM.
05-18-2005, 08:57 AM
#7
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May need to lower the PE enable MAP and/or TPS
if you want to run aggressive timing, or reduce timing
up to that load-point (RPM, CylAir) if they don't want
to enrich early.
Burst knock is only for transients; if you want it in
earlier you have to lower the threshold delta CylAir.
If the KR is steady state though (if you could hold
it at that load point, does it keep knocking?) then
burst knock retard isn't what you want. Decide if
the knock events are transient mixture or steady
state mixture, or spark driven.
That RPM is pretty low, I think maybe they ought to
manage their gear better (if it's manual) or fix the
shift tables for an automatic so they are better set
for pulling. Making it pig rich and spark short at low
RPM isn't really the performance ticket.
if you want to run aggressive timing, or reduce timing
up to that load-point (RPM, CylAir) if they don't want
to enrich early.
Burst knock is only for transients; if you want it in
earlier you have to lower the threshold delta CylAir.
If the KR is steady state though (if you could hold
it at that load point, does it keep knocking?) then
burst knock retard isn't what you want. Decide if
the knock events are transient mixture or steady
state mixture, or spark driven.
That RPM is pretty low, I think maybe they ought to
manage their gear better (if it's manual) or fix the
shift tables for an automatic so they are better set
for pulling. Making it pig rich and spark short at low
RPM isn't really the performance ticket.
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05-18-2005, 09:48 AM
#8
it looks like it is going on under sudden change in throttle, sometimes it wont kick in and others it will, i told him to make sure he didnt put it in 6th gear because too much load in that gear at low speeds would show knock. thats what im starting to think what one log was, i looked at it and for just that one the KR showed up at large change in throttle at low rpm higher speeds, so my guess was he was in 6th doing that, we will see with a new log
