Does this look normal for a stock 305 SD TPI 5 speed ? I'm trying to see if I modified the ECU file correctly, so it doesn't show % increase vs MAP. It used to show numbers like 0-100 KPA and 122-148 for %.

Now it shows: (with no change in actual values)
RPM %
6400 12.15
6000 12.15
5600 11.37
5200 10.98
4800 10.58
4400 10.19
4000 5.10
3600 3.92
3200 3.14
2800 1.96
2400 1.18
2000 0
1600 0
1200 0
800 0
400 0
0 0

From what I read on here, I should be able to make those negative numbers also correct? i.e. changing 12.15 to -12.15 would be 24.30% less fuel (kinda) since it's relative to the VE being tuned to 14.7 A/F. ( I doubt it is).

 

You only change the fueling based on some known.
You don't just change from +12 to -12 in one shot anyway.

To accurately guage AFR, you need to also measure performance.

The PE AFR is somewhat based on the assumption that the WOT part of the VE table is geared toward being Stoich.. Then PE trim vs RPM is based on cal'c PE AFR.

This is one of them things, that can be seen most clearly on an ecm bench, FWIW. From looking at a scan You should see the commanded AFR change when the TPS PE enable it meet, and then that PW change as you change the PE % trim at the various rpm steps.

2% changes and 2d changes, and measure your performance as you go. Too rich with too much timing often feels faster when in fact often it's slower.

 

I realize you wouldn't want to change the fuel by that much, just using that as an example, asking if the computer will recognize neg. numbers.

My tuning knowledge is pretty basic, but WB O2 is saying the A/F is in the mid 12s until ~4000 rpm, where it just starts dropping into the 10s by ~5000 rpm.

I'm really wondering if those % values seem normal for a stock chip or was my modifying of the ecu definition file just a coincendce.