Cobb Datalogs
10-06-2010, 04:34 PM
#151
Ignition timing should be the only declining variable as flow increases.
The "qualification" is that, at some point, you will exceed the AKI of the fuel and significant reductions in ignition timing will be counterproductive, so as a safety margin in the event of overboost, I will add 1 point of AFR at the end of the effective Ve of the system.
10-06-2010, 06:18 PM
#152
Extraordinary Engineering
Thread Starter
10-07-2010, 01:17 AM
#153
If I am reading that right, you are stopping the graph before 4000 k RPM?
It is supposed to be very lean in that range.
I thought you were having lean issues in the 6k and up range.
EDIT - Reading comprehension FML.
Unless you are touching 15:1 below 4k, that is pretty normal. Even the FI applications are kept in the 13:1 range at full boost below 4k.
It is supposed to be very lean in that range.
I thought you were having lean issues in the 6k and up range.
EDIT - Reading comprehension FML.
Unless you are touching 15:1 below 4k, that is pretty normal. Even the FI applications are kept in the 13:1 range at full boost below 4k.
10-08-2010, 03:30 PM
#154
Last Saturday the 2nd, I made a run on MMCCS v4.0.1 and logged this data. This is a complete data log of every variable for 2nd gear WOT and then 3rd gear WOT.
Looks lean under 3rd gear - I was watching and almost aborted the run... Or is this just the transition from closed loop to open loop?
edit: I zeroed out the transition
Looks lean under 3rd gear - I was watching and almost aborted the run... Or is this just the transition from closed loop to open loop?
edit: I zeroed out the transition
Last edited by Nemesis8; 10-08-2010 at 10:57 PM.
10-09-2010, 12:10 PM
#158
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A question from a friend... If one has just recently overhauled the engine, does he has to finish running in the engine first before sending his datalogs or he can do it whilst still running in his engine?
10-09-2010, 07:50 PM
#159
I assume you are talking about Jeff's MMCCS e-tune program, correct? I bet you could run the base map, log idle and cruise, and submit those. Run on v4.0.1 map for awhile, until your engine is broke in, then reset the ecu, do your two drive cycles and then go log again with idle, cruise, and 2/3 wot. I would not run WOT until your are comfortable with your breakin procedure.
10-15-2010, 04:59 PM
#161
Extraordinary Engineering
Thread Starter
Lean
Here's my AFR from a WOT pull 
Edit: Redid the plot with better looking results
Edit: Redid the plot with better looking results
Last edited by DarkBrew; 10-19-2010 at 11:44 AM.
10-15-2010, 05:03 PM
#162
SARX Legend
iTrader: (46)
I use the Hymee Scanalyzer on a laptop to log, and it works great IMO. You can view 6 gauges at once full screen and and you can set parameters as to when the logging start, etc. I always forget to start and stop the log on teh Cobb, I guess it just takes getting used too.
10-15-2010, 06:38 PM
#165
I wrote this awhile back, and used macros. Now I just struggle to get it to work, but I think it is all coming back to me know.
DarkBrew - you map is not as lean as you thought. Compare it to mine. You can see the jump from closed loop to open loop, by looking at your AFR plunging rich, just about where your calculated load jumps up. Also, instead of throttle position, use the accelerator position.
DarkBrew - you map is not as lean as you thought. Compare it to mine. You can see the jump from closed loop to open loop, by looking at your AFR plunging rich, just about where your calculated load jumps up. Also, instead of throttle position, use the accelerator position.
Last edited by Nemesis8; 10-15-2010 at 06:44 PM.
10-16-2010, 07:15 AM
#168
Extraordinary Engineering
Thread Starter
Grrrr
I only have Open Office at home
Excel is at work...
Thanks for the reassurance.
I'll get a new set of logs into Jeff and see what comes of it
I only have Open Office at home
Excel is at work...
Thanks for the reassurance.
I'll get a new set of logs into Jeff and see what comes of it
Last edited by DarkBrew; 10-16-2010 at 07:45 AM.
04-30-2011, 05:01 PM
#172
Bump!!!
@ Darn, your roughly where im at but I dont hit 240g/s, im around 235g/s...
Lets get some more logs!!!
Heres mine on my new engine... On this log I redline gears 2-4....
https://spreadsheets.google.com/ccc?...thkey=CLKK39oH
@ Darn, your roughly where im at but I dont hit 240g/s, im around 235g/s...
Lets get some more logs!!!
Heres mine on my new engine... On this log I redline gears 2-4....
https://spreadsheets.google.com/ccc?...thkey=CLKK39oH
Last edited by WTBRotary!; 04-30-2011 at 05:03 PM.
04-30-2011, 05:24 PM
#173
Bump!!!
@ Darn, your roughly where im at but I dont hit 240g/s, im around 235g/s...
Lets get some more logs!!!
Heres mine on my new engine... On this log I redline gears 2-4....
https://spreadsheets.google.com/ccc?...thkey=CLKK39oH
@ Darn, your roughly where im at but I dont hit 240g/s, im around 235g/s...
Lets get some more logs!!!
Heres mine on my new engine... On this log I redline gears 2-4....
https://spreadsheets.google.com/ccc?...thkey=CLKK39oH