PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

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

Thread Tools
 
Search this Thread
 
Old Aug 12, 2012 | 12:10 AM
  #1  
Z28Camaro30Ann's Avatar
Thread Starter
12 Second Club
iTrader: (15)
 
Joined: Mar 2007
Posts: 1,928
Likes: 0
From: Cheyenne, Wy
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  
Reply
Old Aug 12, 2012 | 07:20 AM
  #2  
edcmat-l1's Avatar
Banned
iTrader: (10)
 
Joined: Jul 2006
Posts: 4,782
Likes: 4
From: Va Beach
Default

Edit: Never mind....
Reply
Old Aug 12, 2012 | 08:34 AM
  #3  
flame's Avatar
TECH Fanatic
20 Year Member
iTrader: (13)
 
Joined: Oct 2004
Posts: 1,169
Likes: 3
From: Waterloo, Ontario
Default

Looks pretty lean till 3700rpm and then timing must get pulled where the step is in the graph. How much timing is commanded WOT?
Reply
Old Aug 12, 2012 | 04:45 PM
  #4  
Z28Camaro30Ann's Avatar
Thread Starter
12 Second Club
iTrader: (15)
 
Joined: Mar 2007
Posts: 1,928
Likes: 0
From: Cheyenne, Wy
Default

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
Reply




All times are GMT -5. The time now is 05:49 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE