What steps to tune VE table in speed density mode

[steveo]

the parameters you HAVE to log for VE tuning:

- MAP and RPM
- fuel trim or wideband afr (or both)

the parameters you SHOULD log, if available, without these your results will be crap:

- coolant temp (allow you to filter out log entries with a cold engine)
- tps (allow you to filter out transitional states like 'i just stabbed the throttle')
- power enrichment, open loop enable, closed loop enable, learning enable, or similar flags (allow you to use the same log for both closed and open loop tuning by filtering)
- AFR target (not necessary if you have an open loop or power enrichment target table that can be used, or if you just set a fixed power enrichment target and tune to that)
- o2 voltage (so you can make sure your o2s are cycling properly)

to tune any portion of the VE table you need LOTS of data from that portion of the table taken during real driving conditions

the only thing you can tune while idling is idle

driving around a parking lot will also not help

basically unless you have a dyno, you will have to plate the car to continue

but if you want to go over the procedure with a sample log just for learning purposes, a parking lot drive will do.

[sachem]

I’ll grab a log file while I’m there at the shop. Do I disable closed loop or allow it to enter into closed loop? That’s one of the things that confuses me. So many of the videos and forums say to not allow closed loop. I’ll set up my logger to capture as many of the parameters that I have available to me in the logging program. As I said, I really want to learn this, so whatever you ask, I’ll do. I don’t have a dyno, so I will have to do the best I can “on the road tune”, but at least I’ll know and understand the procedure.

[Pulse_GTO]

I’ll grab a log file while I’m there at the shop. Do I disable closed loop or allow it to enter into closed loop? That’s one of the things that confuses me. So many of the videos and forums say to not allow closed loop. I’ll set up my logger to capture as many of the parameters that I have available to me in the logging program. As I said, I really want to learn this, so whatever you ask, I’ll do. I don’t have a dyno, so I will have to do the best I can “on the road tune”, but at least I’ll know and understand the procedure.

If you don't have a wideband you will need closed loop activated in order to get feedback from the factory narrowband O2 sensors so that they may calculate the fuel trims. If you have a wideband then you want to log your data in open loop as the O2 sensor will be reporting the actual fuel ratio and the error can be calculated from that.

[sachem]

I do have a wideband.

[steveo]

if you have a closed loop flag in your log so we can tell if you're in closed loop or not then leave it on

[sachem]

Just checked, I do have a closed loop flag.

[steveo]

nice! so if you post a log and your current ve table ill make a tutorial for you