I just put a new blank S2 tune with just the injectors adjusted (finally) and I notice some hesitation while pulling off from a stop. I checked the timing adjustments and I was getting -17* !!!! And it looks like it is coming from the Knock Retard !
Am I really knocking at that level ? Or is it just the sensor having fun ?
It is really annoying cause the car just loose something like 30 hp when this happen, and as soon as I give a little more gas, timing adjustment goes back to 0....
Max Knock retard is set to 14 degrees stock unless you've changed it. ST adn LT knock is all you should be concerned with as far as "Knock"
From several logs, I've seen "Spark Adjust" vary widely and it can be off quite a bit from the "Base", positive or negative. Most I ever seen on a log was -20* timing. It all depends on what the few dozen timing modifiers are doing.
Torque Mangament can pull alot of timing but don't ask me what PID will indicate that TM is active.
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Last edited by duster360 : 08-18-2009 at 09:23 AM.
It's 17° on a S2 tune. Try unplugging the knock sensor, and taking a test ride. See if KR goes away. If not, time to check the wiring to the knock sensor. After that, it is a software issue.
Are you talking about the part throttle delay in first gear at those RPM's? I tried forever to fix that damn thing and I dunno how.
yeah, but I realised that this delay comes from a timing adjustments of - 17 degree. And that this 17 degree of reduction comes from knock retard (from what my aeroforce tells me).
I didn't unplug the knock sensor yet (I don't even know where it is, I have to check).
But when I had my stock injectors on (that would be one month ago) I didn't think that i had this issue.
Hope it's not something like the vibration of the hard motor mounts or vibration from the exhaust or something like that.
It is just really annoying !!!!!
Last edited by SRT-What? : 08-20-2009 at 05:44 PM.
yeah, but I realised that this delay comes from a timing adjustments of - 17 degree. And that this 17 degree of reduction comes from knock retard (from what my aeroforce tells me).
I didn't unplug the knock sensor yet (I don't even know where it is, I have to check).
But when I had my stock injectors on (that would be one month ago) I didn't think that i had this issue.
Hope it's not something like the vibration of the hard motor months or vibration from the exhaust or something like that.
yeah, but I realised that this delay comes from a timing adjustments of - 17 degree. And that this 17 degree of reduction comes from knock retard (from what my aeroforce tells me).
I didn't unplug the knock sensor yet (I don't even know where it is, I have to check).
But when I had my stock injectors on (that would be one month ago) I didn't think that i had this issue.
Hope it's not something like the vibration of the hard motor mounts or vibration from the exhaust or something like that.
It is just really annoying !!!!!
A while back one of the DS engineers told me that the PCM Torque Management will reduce timing if it thinks its needed but it will report this timing reduction as Knock Retard. I haven't personally varified this but it could be what you are seeing, especially at that RPM and MAP.
I raised the 'desired torque' table this morning before going to work. It did have less knock retard, but it might just be that I was in a hurry and was driving faster than usually. I'll test some more and keep this thread updated... You never know when you might get 17 degrees of knock retard at 2000 rpm
ps. I still haven't unplug the knock sensor. It is the next step on my list.
Problem solved. I pretty much did nothing. It just gradually went away. I'm thinking that I could have been bad gaz, but it wouldn't explain why it wasn't knoking at wot but only at low boost and low rpm.
It is alot more confortable to be able to take off a stop without having -17 degree of timing !
can i take a wild stab, and say that you are running RC injectors. This is the typical injector stumble issue that so many people have been battling. I actually have another post about it in the tech section. Look on your wideband and see if the AF goes lean around that area. Im curious if you change any section of the tables to correct the problem.
I datalog via an aeroforce gauge (hahahaha). I look at about all the parameters I can.
I'm running deka 60lb injectors.
My LTFT went up to -10 after I hooked up my 1:1 rising rate (it should be going from 58psi to 38 under vacuum, but it only goes down to about 48 psi ) and it leaned by about 0.6 point my AFR under wot. I'm working on this (but it does take more time when you don't have shit to datalog..)
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17*KR between 2-3000 rpm @ -5 psi
Linear Mode
