What parameters to datalog for a tuner?

FastCougar · 01-30-2007, 11:04 AM

Tom, this question is directed specifically to you. I know you have stated so in other threads, but I am creating this thread so that it can be stickied.

Exactly what parameters need to be datalogged in order for you to create a good baseline tune/rework an existing tune?

I'm just as guilty as anyone for forgetting a parameter or two, so please remind us. Better yet, to help educate everyone, a brief explination of each parameter would be helpful.

warmonger · 01-30-2007, 09:03 PM

Wow. I suppose it depends on who is tuning. Some people thing they are clairvoyant or something (with a car...

) and some people claim they need everything.

-throttle position absolute
-rpm
-maf AD counts
-airflow in #/min
-load
-open loop flag
-imrc state (if imrc involved)
-Long term fuel trim bank 1
-long term fuel trim bank 2
-Short term fuel trim bank 1
-short term fuel trim bank 2
-O2 sensor bank 1 forward (or upstream)
-O2 sensor bank 2 upstream
-coolant temp
-intake charge temp
-spark timing
-knock sensor retard

This is probably the basic list and covers most requests. There will be specific requests if an issue is detected.

gamiller · 09-06-2007, 11:09 AM

There are probably over twenty parameters that are useful when troubleshooting the A/F mixture for a tune. Unfortunately, the XCAL2 only logs up to 15 at a time. These are the fifteen that Tom told me he needed most.

Environment
AIR_CHARGE_TEMP
COOLANT_TEMP

Fuel
LTFT_BANK1
LTFT_BANK2
OPEN_LOOP_FLAG

IMRC
IMRC_CMNDED_FLG

MAF
AIRFLOW_#/MIN
LOAD

Misc
RPM
TP_ABSOLUTE

O2
O2_B1_FRONT_V
O2_B1_REAR_V
O2_B2_FRONT_V
O2_B2_REAR_V

Spark
SPARK_ADVANCE

michcougar · 09-07-2007, 01:28 AM

Quote:

Originally Posted by FastCougar

Tom, this question is directed specifically to you. I know you have stated so in other threads, but I am creating this thread so that it can be stickied.

Exactly what parameters need to be datalogged in order for you to create a good baseline tune/rework an existing tune?

I'm just as guilty as anyone for forgetting a parameter or two, so please remind us. Better yet, to help educate everyone, a brief explination of each parameter would be helpful.

Awesome post!

Id like to find out where and what is causing me to run so rich. So a description of the parameter's would be great!

01-30-2007, 11:04 AM	#1 (permalink)
FastCougar In search of more boost! Join Date: Nov 1999 Location: Kearneysville, WV Posts: 7,986 Images: 732	What parameters to datalog for a tuner? Tom, this question is directed specifically to you. I know you have stated so in other threads, but I am creating this thread so that it can be stickied. Exactly what parameters need to be datalogged in order for you to create a good baseline tune/rework an existing tune? I'm just as guilty as anyone for forgetting a parameter or two, so please remind us. Better yet, to help educate everyone, a brief explination of each parameter would be helpful. __________________ 1999 Mercury Cougar - Turbo'd 3L. Status: Just hit 22.1 psi @ 60% duty cycle on boost controller. Power: 391.9 hp @ 6750 rpm \| 374.2 lbs/ft. @ 4250 rpm \| boost @ 11 psi For Sale: 19" Konig Verdicts with Toyo ProxesFZ4 225/35ZR19 Tires - $900 shipped! "There are times when I wish someone would implement facepunching over TCP/IP" - NorCalCoug

01-30-2007, 09:03 PM	#2 (permalink)
warmonger NECO Member Join Date: Feb 2003 Location: Central Texas Posts: 776	Re: What parameters to datalog for a tuner? Wow. I suppose it depends on who is tuning. Some people thing they are clairvoyant or something (with a car... ) and some people claim they need everything. -throttle position absolute -rpm -maf AD counts -airflow in #/min -load -open loop flag -imrc state (if imrc involved) -Long term fuel trim bank 1 -long term fuel trim bank 2 -Short term fuel trim bank 1 -short term fuel trim bank 2 -O2 sensor bank 1 forward (or upstream) -O2 sensor bank 2 upstream -coolant temp -intake charge temp -spark timing -knock sensor retard This is probably the basic list and covers most requests. There will be specific requests if an issue is detected. __________________ My project website Nautilus Performance We are now an authorized SCT Dealer![SIGPIC]

09-06-2007, 11:09 AM	#3 (permalink)
gamiller Group Buy Guy Join Date: Jun 2001 Location: Fairfax, VA Posts: 2,272 Images: 4 Blog Entries: 3	Re: What parameters to datalog for a tuner? There are probably over twenty parameters that are useful when troubleshooting the A/F mixture for a tune. Unfortunately, the XCAL2 only logs up to 15 at a time. These are the fifteen that Tom told me he needed most. Environment AIR_CHARGE_TEMP COOLANT_TEMP Fuel LTFT_BANK1 LTFT_BANK2 OPEN_LOOP_FLAG IMRC IMRC_CMNDED_FLG MAF AIRFLOW_#/MIN LOAD Misc RPM TP_ABSOLUTE O2 O2_B1_FRONT_V O2_B1_REAR_V O2_B2_FRONT_V O2_B2_REAR_V Spark SPARK_ADVANCE __________________ Roush Performance Suspension Nautilus Performance Big Brake Kit Nautilus Performance Turbo Kit ...with all the trimmings! :D Last edited by gamiller; 09-10-2007 at 06:42 PM.

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