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383 LT1 TunerPro Datalogs...PLEASE HELP!!!

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Old 08-12-2012 | 12:10 AM
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Default 383 LT1 TunerPro Datalogs...PLEASE HELP!!!

Ok, so after my dyno today I noticed a hitch in my step on the dyno graph. I decided to re-datalog my PCM and see what it is. AFR looks ok so I figured it was timing.....UNFORTUNATELY, I was right...here are my findings:

BEFORE the dyno today (about a week or so) gregrob and I got on the phone and we put a basic WOT tune on the PCM using datalogs from TunerPro RT and I have Tunercats. We got it FAIRLY close on the AFR and I was pulling ZERO knock at idle, street diving, or WOT. Everything looked good and felt good........I can email the last datalog I did a week before the dyno with some idle, street driving and WOT to show you what I mean. It is titled "7.xdl"

After I saw my dyno graph (included below) I datalogged again and now I am pulling TWELVE DEGREES of knock at idle! WTF??!! Street driving it, it drops to a range of 5* to 3* an sometimes less. At WOT it is 5* to 3* Knock Retard. I have included a datalog of this as well. SAME EXACT TUNE in BOTH datalogs...NOTHING was changed...any thoughts??!! This datalog is labeled "Timing Woes.xdl" and I can email it as well.

Again, these are datalogs from TunerPro RT. If anyone can help me it would be GREATLY appreciated! Even with this she put down 423/395 lol...Just hope something isnt going wrong. If you are willing to help me, PM me your email address and I will send you the datalogs. I don't see any burned or damaged wires, I have a brand new LT4 KM, brand new 94 LT1 Knock Sensor and a 94 OBD1 PCM. As far as I can tell, nothing is hitting anywhere and I hear no noise that would cause false knock...

Also, here is a video of the dyno...the guy driving didnt know how to drive her so it was a little....rough...getting her up to speed...I know now that part of that is the timing as well.

Attached Thumbnails 383 LT1 TunerPro Datalogs...PLEASE HELP!!!-imag0653.jpg  
Old 08-12-2012 | 07:20 AM
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Edit: Never mind....
Old 08-12-2012 | 08:34 AM
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Looks pretty lean till 3700rpm and then timing must get pulled where the step is in the graph. How much timing is commanded WOT?
Old 08-12-2012 | 04:45 PM
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Here is what I pulled off of my datalog and wrote down. This is all at WOT in 4th gear...

2800 RPM's, 100% TPS
L O2 - 896, R O2 - 923
L BLM - 128, R BLM - 128
Spark Adv - 32
Knock Retard - 5.50
kPa - 83.42 (with engine off kPa is ~85)
Engine Airflow - 93.80

4000 RPM's, 100% TPS
L O2 - 905, R O2 - 892
L BLM - 128, R BLM - 128
Spark Adv - 36
Knock Retard - 4.75
kPa - 84.15
Engine Airflow - 187.64

4450 RPM's, 100% TPS
L O2 - 901, R O2 - 919
L BLM - 128, R BLM - 128
Spark Adv - 33
Knock Retard - 4.38
kPa - 81.94
Engine Airflow - 208.13

5200 RPM's, 100% TPS
L O2 - 896, R O2 - 901
L BLM - 128, R BLM - 128
Spark Adv - 33
Knock Retard - 4.25
kPa - 81.20
Engine Airflow - 254.83

5750 RPM's, 100% TPS
L O2 - 941, R O2 950
L BLM - 128, R BLM - 128
Spark Adv - 35
Knock Retard - 3.81
kPa - 79.36
Engine Airflow - 276.59



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