I just got an LM-1 (wideband) for my other car so I am looking forward to using it for the f-body finally as well. My question is this: Can I tune the car without the O2 sensor connected? I know I'd be in closed loop during this (which is my intention). What I am trying to do is get a good baseline down for the fuel maps using just the logs I get from the LM-1 then plug the sensor back in for the ECU to make all the fine adjustments. I do prom tuning with other fuel injection systems where this is possible but I'm not too keen on this GM stuff.
My main issue has been difficulty in seeing changes from the tables. Using the wideband setup, I'm assuming changes will be much easier to see.
Please give me some feedback on this. Thanks!

 

If the narrow band is disconnected, you won't go into closed loop.

 

Force it to run open loop and turn off the EGR and canisiter purge functions.

Once its warm shoot for a 14.6-14.7 reading on the wideband in the VE tables/MAF tables(missed which u are using).

Dont get carried away and work slowly.

This should get u into the ball park for closed loop control once its reenabled.

On the fly is great, but u may blow right past what your car likes best or forget wha you did.

later
Jeremy

 

I think I know what you mean about it being hard to see the changes in the logworks file. What I ended up doing was transferring all my logs to an Excel file. Now i can read the WBO2 logs dead on.

 

i ran my car for the last month of season in OL. i experimented on various A/F ratios and found car ran best 13.5 - 14.0/1. now that may be masking other issues but it liked the richer A/F. seems the transition on tip in was better when crawling in traffic with manual trans. especially on minimal TPS movement. same on slow accell from say 55 to 70 in overdrive(5th gear). less stumbles seen. i then would jump CL after making global changes in VE and correct any cells that were off. i think last i saw in OL was 124 accross the board. gas mileage suffers.

with the rpm/tps/map i could closely approximate the events vs what cell i was in table. i think the new code we will soon have at our disposal will make it even easier.

time to put the snomobiles away and think of pulling the car out of barn

 

Thanks... I'll be working on it this weekend... Hopefully I see better results.