Cobb Datalogs
09-19-2010, 02:30 PM
#109
Well, it is one of my favorite threads! 
Here is my untuned warm idle log...
I have not really had time to do anything to my car lately. I bumped my idle up a bit to compensate for the porting. I really need to get going on my tune. I started an e-tune session with Jeff, but this car needs a dyno tune. Waiting to hear back from Surgeline in Portland.
Here is my untuned warm idle log...
I have not really had time to do anything to my car lately. I bumped my idle up a bit to compensate for the porting. I really need to get going on my tune. I started an e-tune session with Jeff, but this car needs a dyno tune. Waiting to hear back from Surgeline in Portland.
Last edited by Nemesis8; 09-19-2010 at 02:32 PM.
09-19-2010, 04:02 PM
#111
Registered
Join Date: Apr 2010
Posts: 75
Likes: 0
Received 0 Likes
on
0 Posts
Well, it is one of my favorite threads!
Here is my untuned warm idle log...
I have not really had time to do anything to my car lately. I bumped my idle up a bit to compensate for the porting. I really need to get going on my tune. I started an e-tune session with Jeff, but this car needs a dyno tune. Waiting to hear back from Surgeline in Portland.
Here is my untuned warm idle log...
I have not really had time to do anything to my car lately. I bumped my idle up a bit to compensate for the porting. I really need to get going on my tune. I started an e-tune session with Jeff, but this car needs a dyno tune. Waiting to hear back from Surgeline in Portland.
I even bumped it up to 1200 for a bit to see if it makes a difference, it did not.
Adjusted in all 3 map area's as well.
09-19-2010, 05:18 PM
#112
Here are a couple of mine from earlier today .... you can see more discussion at https://www.rx8club.com/series-i-engine-tuning-forum-63/stinksause-attempts-tunning-201668/
most of em are WOT .... but have some cruising sections to them
you can also see than my LTFT changed over the course of the day ... my car has not finished setting them
most of em are WOT .... but have some cruising sections to them
you can also see than my LTFT changed over the course of the day ... my car has not finished setting them
09-19-2010, 05:51 PM
#114
For MAF Scaling, long 3-4th gear pulls on flat ground are best (cruise control)...
As for what to log:
Time
Coolant Temp. (° F) - optional for most things
Equiv. Ratio (AFR)
RPM (RPM)
Calculated Load (%)
Long Term FT (%) - get STFT too, helps to see open loop
Mass Airflow (g/s)
MAF Volts
Throttle Position (%)
Ign. Tim. Lead. Coil (°)
Ign. Separation (°)
The rest of this list looks fine.
As for what to log:
Time
Coolant Temp. (° F) - optional for most things
Equiv. Ratio (AFR)
RPM (RPM)
Calculated Load (%)
Long Term FT (%) - get STFT too, helps to see open loop
Mass Airflow (g/s)
MAF Volts
Throttle Position (%)
Ign. Tim. Lead. Coil (°)
Ign. Separation (°)
The rest of this list looks fine.
And set the Air/Fuel 3-4 Gear Map to all 14.7? As the long slow part, log from 0.00 calculated load all the way to 1.25 calculated load?
09-20-2010, 12:20 AM
#116
I think you guys are confusing the "old school" way using excel and the Baseline way.
You ONLY set your cruising areas to 14.7 (lambda 1) for the maf scaling if you are using excel style... Baseline you just make sure your target AFR map and your AP Gear map are the same.
No matter what - you never WOT at 14.7.... this is bad juju
09-20-2010, 08:34 AM
#119
How do you filter bad data from the log? I remove all data with AFR above 16.5 (fuel cutoffs). Doing this drops the correction from 9-10% to +/- 1% on all logs in one driving cycle. Anything else? Should I shift AFR to compensate for sensor latency and get more accurate correction?
Here is a log. WOT pull in 2nd gear at 423s.
Here is a log. WOT pull in 2nd gear at 423s.
Last edited by SC-ed; 09-20-2010 at 09:58 AM.
09-20-2010, 10:24 AM
#121
SARX Legend
iTrader: (46)
SC-ed,
From time 431.58 through 443.77 you are off throttle right? Man you are getting to 8900 RPMS and 284.44 in airflow. I want FI. I am still a noob but everything looks good to me.
From time 431.58 through 443.77 you are off throttle right? Man you are getting to 8900 RPMS and 284.44 in airflow. I want FI. I am still a noob but everything looks good to me.
09-20-2010, 11:46 AM
#122
How do you filter bad data from the log? I remove all data with AFR above 16.5 (fuel cutoffs). Doing this drops the correction from 9-10% to +/- 1% on all logs in one driving cycle. Anything else? Should I shift AFR to compensate for sensor latency and get more accurate correction?
Here is a log. WOT pull in 2nd gear at 423s.
Here is a log. WOT pull in 2nd gear at 423s.
But hey - 1% is damn good.
09-20-2010, 12:30 PM
#123
No problem...Anyway if I shift the AFR I'm getting ridiculous AFR's of 15-17s at WOT in 8XXX RPM. I don't fill it in the car. So I don't shift.
Here is the WOT portion of the log, no AFR shifting.
