when I try to get values for a certian RPM at different loads (kpa), my engine won't stay at that specific RPM long enough to record a consistant reading. No matter how steep a hill I drive on. What techniques does everyone use to get most if not all your VE tables dialed in. Thanks.

 

I do a couple of things. 1) I set the TCC to lock at a fairly low speed to give a higher load on the engine and 2) I make sure the %TPS for PE is set high to avoid the ECM going into PE.

I also have "data capture" occurring so I can review the information later, as it is not a good idea to be looking at your scan tool while you are driving.

Getting the lower RPM values while in 4th gear is pretty easy to get good readings, but as you mention for the higher RPM values, you generally have to be in a lower gear and generally you will be capturing data while you are accelerating. You won't be able to hold a "steady 2,000 rpm @ 70 kpa" like you can in 4th gear.

This is where doing multiple "slow acceleration" up a grade in the lower gear helps while capturing data. Also, stepping a little on the "brake" can help increase the load - though I would not hold the brake too long or too hard.

I would just keep repeating the process and review the information when you get home. I find that MORE DATA (and taking an average) gives the best results. Also, look at a WB O2 sensor to help with WOT tuning.

 

Thanks for the info!