Converter Lockup = KR
10-02-2004, 10:52 AM
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Converter Lockup = KR Any ideas what could be causing 10 degrees of knock retard when the converter locks up? We just replaced the transmission.
10-02-2004, 03:58 PM
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Sudden decrease in engine speed makes for a CylAir
surge and the spark may not pull back fast enough.
Also because you abruptly change the MAP you will
be momentarily using the speed-density tune and
that could be leaner than ideal esp. with heavy mods
in the mid to upper RPM. Log it and see if you have a
"lean hole" at TCC lock (suspect the SD tune) or just
a timing value that doesn't fall back quick enough.
surge and the spark may not pull back fast enough.
Also because you abruptly change the MAP you will
be momentarily using the speed-density tune and
that could be leaner than ideal esp. with heavy mods
in the mid to upper RPM. Log it and see if you have a
"lean hole" at TCC lock (suspect the SD tune) or just
a timing value that doesn't fall back quick enough.
10-07-2004, 05:51 AM
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Once my converter locks up, if I load it (get into the throttle significantly but not enough to unlock), I see 7-9* of KR. It's only under load...otherwise it's fine. Is this the same thing?
10-07-2004, 11:45 AM
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You may want to have PE kick in earlier (zero delay, lower
MAP, lower TPS). Check the commanded AFR or fuel air
multiplier and see if you are trying to accelerate at 14.7/1.0
when you start to ping. Also check whether you are seeing
ping only on throttle opening, in which case your mid-MAP
VE table probably wants fattening. Especially if you have
cam / exhaust mods the true VE may have gotten a lot
better than the stock table.
MAP, lower TPS). Check the commanded AFR or fuel air
multiplier and see if you are trying to accelerate at 14.7/1.0
when you start to ping. Also check whether you are seeing
ping only on throttle opening, in which case your mid-MAP
VE table probably wants fattening. Especially if you have
cam / exhaust mods the true VE may have gotten a lot
better than the stock table.
