 Re: Hesitating shifts
To clear up what I meant about being in PE mode, the LTFT and STFT - the pcm will NOT make any fuel trim adjustments in PE mode, which is dependant on what you have your table set to and usually is in the 30-45% range depending on rpm. Once it goes into PE mode then it is essentially open loop which means the pcm does not use the 02 sensor for fueling and works off of fixed tables. Lowering your maf signal with an AFC will cause ALL of your maf numbers to drop unless you have a V2.x AFC which I believe allowed you to tweak different areas which would be benificial but still require lots of maf table and fueling tuning. Lowering your maf input helps your maxing out at 11500 problem BUT also means that the entire maf table will read too low and the car will run lean, so you will have to add fueling back in. For part throttle driving the fuel trims will change, going positive because it needs to add fuel because the car is running lean. You will need to roughly add the % off that the fuel trims are back into the lower end of the maf table to correct the trims being wrong. You can do this up to your PE enable point is so part throttle driving has the correct fuel trims which is important as WOT will referrence to this and they need to be as close to zero as possible. Since your entire maf table is lower due to the AFC being line your WOT and anything in PE mode fueling will be too lean. Generally, and most accurately, you adjust this with the maf table so you will have to correct this also. Without a wideband you are only going to be guessing where you are at but you can get in the ballpart without one. One problem you may run into and as I mentioned earlier is that by dropping your maf signal you are also going to cause the trans to have lower line pressure and cause softer shifts and delayed WOT shifting. You run into this when scaling back the maf too far or by running a much larger maf sensor/ported large throttle body/large intake pipe but every car is different. If you are using a PT this is where you are going to get into trouble as I dont believe you can adjust the pressure control solenoids amperage tables which is needed when maf numbers are low as you need to decrease the amperage in certain sections of the table to bring your trans pressure back up. |