I have the Tunercat program for my 95 LT1, and I want to know how I can lean the motor a little bit, which table should I use? The only table which I can find is AFR X10 vs MAP vs Coolant Temp in Open Loop. This table can't be right because you won't change anything in closed loop when car is warm, am I right?

Thanks,
Trevor

 

MAF calibration tables, make it read fewer grams of air at each given frequency. If you switch to speed density than edit the Volumetric Efficiency tables and drop the VE down a bit.

 

Are you talking at WOT or during cruise?

Ken R.

 

I am talking at WOT for more power, leaving it as is for cruise should be fine.

 

At WOT, you would use the open loop AFR tables.

 

% Change To Fuel/Air Ratio Vs Cool Temp at WOT and % Change To Fuel/Air Ratio vs RPM at WOT are the tables that control WOT commanded A/F at WOT. It is best to leave the Temp table as is and change the values in the RPM table. Smaller #s = leaner.

 

Exactlly what 2xLS1 said. Both tables with adjust it, but just adjusting the RPM table makes it easier to dial in. You can get it spot on with that if your on a dyno or have a wideband. Just increase the values at the specific rpm's to richen it up and decrease to lean out. Don't adjust anything Open Loop if your still running with the MAF cause your only running Open Loop when cold.

Ken R.

 

Thats what I thought, so it's pointless for me to adjust those open loop WOT tables because I am running with MAF on car. So once car is warm it's in closed loop, so I need a way to adjust closed loop. Anyone?
Thanks
Trevor

 

What 2ls1s said

 

These (% Change To Fuel/Air Ratio Vs Cool Temp at WOT and % Change To Fuel/Air Ratio vs RPM ) ARE the WOT tables for closed loop. Don't adjust anything else if your purpose is to get your closed loop AFR dialed in at WOT using a MAF.

Ken R.