Ok so I am working on my first tune for my 6 speed LS1 GTO with Kooks LT, catless mid pipes, Borla catback and OTRCAI. I believe I have my VE and Maf tables dialed in enough. Can anyone help me with my tune? I am currently working on WOT now and adding timing. My last run I got up to 4 degrees of knock in first gear. But then no knock in 2nd or 3rd.
This could be exhaust banging, the motor rolls over more
in 1st because driveline torque (so back-torque against
the soft mounts) is highest. I'f check clearances and any
place you can't slide a chunk of 2x2 between pipe and
other features, is suspect. Especially the further from
centerline it is.
Tight could be the problem, you need enough gap to not bang
on acceleration. Like cut yourself a bunch of short 2x4 sections,
loosen the pipe, shim every spot that will hold the chunks in
tension and then put the floor jack to the lowest point on the
pipe, lift until the body rises and tighten it all up.
Real spark knock should respond to pulling out timing or by
fattening mixture. Transient KR on throttle opening points
to mismatch between speed density and MAF air mass,
and has to be "caught in the act" - a "divot" in NBO2
voltage for example, that leads the KR event, points
to this.
Halve your attack rate and double the decay rate to
get a better idea of where KR is really happening and
whether it's truly persistent, or you're just being dogged
by an over-aggressive jump-up and a stupid slow bleed
down of the retard value. Stock settings obscure too
much of the action.
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