Tuning log for the C5Z

[Rich Z]

10-13-2013 - Tune #0024_CL

Reverted back to tune #0022_CL

Logged on 10-14

{B4522} Stall Saver RPM
Made values 100 less than target RPM

{B0101} Main VE Table
Seems to be running a bit lean. Adjusted from MAP E

{B5943} Spark IAT vs RPM Multiplier
1200 thru 2000 RPM changed to 1.00

{B5932} Base Spark In Gear
0 thru 800 RPM +2 degrees

{B5933} Base Spark in P/N
Copied from {B5932}

{B5920} Spark Smoothing Enabled

{B5929} Max TPS to Enable Spark Smoothing
Changed from 80.00 to 1.8


Log notes:

Frame 9624 - High
Frame 22520 - Low

[Rich Z]

10-14-2013 - Tune #0025_CL

Logged on 10-16

{B3613} PE Map Threshold
Changed from 90 to 15

{B3415} Wall wetting Min RPM
Changed from 0 to 300

{B3416} Wall Wetting Min TPS
Changed from 0.00 to 3.01

{B3314} DFCO Vehicle Speed Enable
Changed from 28 to 30

{B3318} DFCO RPM
Copied from stock Z06 tune

{B3606} Maximum Enrichment
Changed from 0.780 to 0.885

{B0101} Main VE Table
Adjusted from MAP E

[Rich Z]

10-17-2014 - Tune #0026_CL

Logged 10-17

{B0101} Main VE Table
Adjusted from MAP E and smoothed

{B4315} Throttle Follower Airflow
Copied from stock Z06 tune

{B4316} Throttle Follower Airflow RPM Multiplier
Copied from stock Z06 tune

{B4317} Throttle Follower Decay Rate In Gear
Copied from stock Z06 tune

**Idle too low when coming to a stop with clutch pedal pushed in

**Reloaded tune #0025_CL

[Rich Z]

10-26-2013 - Tune #0027_CL

Reverted back to tune #0025_CL

Logged on 11-09 and 11-21

{B4108} STFT Idle Enable
Enabled

{B1201} Abuse Management
7000
6900

{B3303} Fuel Cut Off Limiter In Gear
Changed from 6600 to 7000
Changed from 6599 to 6999

{B4603} Desired Idle Speeds
Raised values in higher temp range
Copied values from "In Gear" table into "In Park/Neutral" table.

{B4308} Airflow Parked
68 thru 284 raised values 20%

{B4307} Desired Airflow
Copied "In Gear" table to "Park/Neutral" table

[Rich Z]

10-26-2013 - Tune Valet_Mode_01

Preliminary - not tested

{B2201} ETC Rev Limit Enable
Enabled

{B3330} Fuel Cut Off In Park/Neutral
Changed from 6900 to 3500

{B3331} Fuel Re-enable in Park Neutral
Changed from 6899 to 3499

{B3303} Fuel Cut-off Limiter In Gear
Cutoff = 3500
Re-enable = 3499

{H0108} ETC Speed Govern Threshold
Changed 255.0 to 35.0

{H0109} Maximum Vehicle Speed (Non ETC)
Changed from 255.0 to 35.0

{H0111} Maximum Vehicle Speed (with ETC)
Changed from 256.0 to 35.0

{H0114} Maximum Vehicle Speed with RTD Fault
Changed from 256.0 to 35.0

{B1201} Abuse Management
Changed from 6600 to 3500

{B1207} Abuse Management Vehicle Speed Threshold
Changed from 0 to 255

{B1205} Abuse Management TPS Lower Threshold
Changed from 99 to 1

[Rich Z]

12-04-2013 - Tune #0028_CL

**Getting reduced engine power intermittently

{C6101} ETC Predicted Airflow
Added 30% to all cells

{C6102} ETC Predicted Airflow
Added 30% to all cells

**Note: At the time I thought the reduced engine power failure was being caused by something I had done in the tuning. Long story short, it turned out to be a defective TAC module.

[Rich Z]

12-04-2013 - Tune #0029_CL

{B4349} ETC Throttle area conversion
Changed from 0.0330 to 0.0192

**Car will not idle after blipping the accelerator pedal

** Rolled back to tune #0028_CL

[Rich Z]

12-07-2013 - Tune #0030_CL
Reverted back to tune #0028_CL

Logged on 12-08

{B4403} IAC Effective Area
Shifted cells down 6 steps

{B3618} PE Modifier Based on RPM
Flattened cells above 4000 that were sloping upwards (lean)

Disabled P1516 in Engine DTC Processing Enablers and Engine DTC MIL Enablers

**As of today (08-03-2014) this is the tune that I have been running in the car since 12-07-2013.

**There is still a slight surging when driving down my dirt road below 10 mph, but I believe there is nothing that can be done about it via tuning. Perhaps the car just doesn't like being driven that slow....

And to be perfectly honest, often my stock C6 Z06 will do the same thing.

[Rich Z]

Tune# 2014_10_06_0001

Not logged

I had a couple of things I wanted to try to straighten out, so decided to work on a new tune.

1. Faint gasoline smell at idle so I suspected that maybe the AFR was a bit rich in the low rpm/low kPa range of the VE table.
   
   B0101 - Main VE Table - leaned and smoothed cells in 15-30 kPa & 400-2400 rpm range.
   
   B3647 - Commanded Fuel vs RPM - Leaned out idle cells 5%
   
   B0107 - Max Speed for Idle Mode - changed from 5 to 0
   
   Just for grins I also replaced the filter on the rocker arm covers breather.
   
   
2. I noticed that sometimes when shifting the AC on and off, the engine would buck a bit during the transition, so I wanted to try to smooth that out a bit.
   
   B4367 - A/C Clutch On Spark Torque Ramp In - Changed from 6 to 4
   
   B4368 - A/C Clutch On Spark Torque Ramp Out - Changed from 6 to 4
   
   B4370 - A/C Torque ETC Max Compensation - Changed from 10 to 5
   
   
3. Throttle response is just a bit spongy feeling at low-mid RPM levels, so I wanted to try to sharpen that up a bit.
   
   B3616 - Normal PE Mode Enable (TPS%) - Adjusted 1600 to 4400 rpm -20% and smoothed manually.

Took it out for a test drive today and there seemed to be improvements in all three areas I addressed. I also noticed that the low speed (under 10 mph) seemed to be improved in that the car didn't surge as much as it used to. So I may work on #1 above a little bit more.

Wish I had kept notes like this all through the tuning effort. I recall that a LOT of the later work I did was simple chasing a ghost since I thought the REDUCED ENGINE POWER problem I was getting intermittently at startup have been caused by my own tuning fumbling. Obviously it was the TAC module all along, since replacing that cured the problem. I know I had been playing around quite a bit with the engine startup parameters chasing this problem, and initially I had the engine startup up REAL sharp and firm. So I softened it a bit thinking this was causing that error. Maybe I'll look into that as well sometime soon.

[mrr23]

Drive ability tuning is a fine art that takes many hours to learn. Most tuning shops don't get that involved when tuning. They get it close enough for their liking and leave it. I've read a few shop tunes over the years and with logging, seen where they didn't focus on and fixed it for people. Perseverance.