WHy is timing being pulled?
WHy is timing being pulled? I'm getting my tune to really good spot... much better then its ever been.
I just got done doing some wideband VE tuning and the car drives a lot better, but my off idle timing seems to be holding me back...
Every time I push the gas, timing gets pulled for just an instant and then starts to climb.
I'd like it to not do this... Is there something in my tune that I have still turned on that is doing this?
Here's a log of what I'm facing... Time frame between 5:15 - 8:00 minutes. You can see where I'm pushing the gas and the little dip in timing before the climb, each time.
I'll put my tune up also if you can take a look please.
Is this directly related to my timing curve, and I just need to bump it up a few degrees in the right g/cyl cells?
Thanks for any help.
I just got done doing some wideband VE tuning and the car drives a lot better, but my off idle timing seems to be holding me back...
Every time I push the gas, timing gets pulled for just an instant and then starts to climb.
I'd like it to not do this... Is there something in my tune that I have still turned on that is doing this?
Here's a log of what I'm facing... Time frame between 5:15 - 8:00 minutes. You can see where I'm pushing the gas and the little dip in timing before the climb, each time.
I'll put my tune up also if you can take a look please.
Is this directly related to my timing curve, and I just need to bump it up a few degrees in the right g/cyl cells?
Thanks for any help.
I can't see logs on phone but from description that sounds like burst knock. It preemptive my cuts timing under throttle transitions cause it COULD knock.
There's a table for burst knock you can zero out
There's a table for burst knock you can zero out
Thanks. I'll try that. I saw that, just wasn't sure I was getting enough knock just from bumping the throttle.
Trucks (which presumably your LQ4 came from along with
the PCM & tune) have lousy sensitive burst knock threshold
"step air" values. I worked on a '99 pickup once that couldn't
get out of its own way in 1st gear, because just the RPM
rate-of-rise was hitting the delta-cyl-air (step air) limits.
I put in the numbers from a Camaro table and it was a whole
different truck.
You can log all of the components of spark retard individually
and pick out who's bugging, easy enough. Advance too, in
case somebody on that side is going negative. But I'd bet on
either burst knock (predictive) or knock retard (reactive,
esp. to VE table issues that make a "lean hole" on tip-in
and cause ping to which the KR then over-reacts).
the PCM & tune) have lousy sensitive burst knock threshold
"step air" values. I worked on a '99 pickup once that couldn't
get out of its own way in 1st gear, because just the RPM
rate-of-rise was hitting the delta-cyl-air (step air) limits.
I put in the numbers from a Camaro table and it was a whole
different truck.
You can log all of the components of spark retard individually
and pick out who's bugging, easy enough. Advance too, in
case somebody on that side is going negative. But I'd bet on
either burst knock (predictive) or knock retard (reactive,
esp. to VE table issues that make a "lean hole" on tip-in
and cause ping to which the KR then over-reacts).
Here's a new drive log and an adjusted tune. I took all the burst knock out and changed the delta cylinder air to 1.00 g/cyl, I figured this would be enough.
It seems to be a little more responsive but the timing seems to follow the TPS almost exactly, until I'm in boost... I'm thinking maybe its just my timing curve, I've yet to do any major adjustments to it to see though.
I feel like I'm missing a button somewhere in the tune.
I feel like I have to wait on the timing to rebuild every time I push on the gas.
It seems to be a little more responsive but the timing seems to follow the TPS almost exactly, until I'm in boost... I'm thinking maybe its just my timing curve, I've yet to do any major adjustments to it to see though.
I feel like I'm missing a button somewhere in the tune.
I feel like I have to wait on the timing to rebuild every time I push on the gas.
Looks like it was a combination of burst knock and a conservative timing curve.
I've been playing with the timing table with RTT a lot lately and this car is really waking up in the lower RPM's.
Thanks for the help.
I've been playing with the timing table with RTT a lot lately and this car is really waking up in the lower RPM's.
Thanks for the help.
