Power FC M&W UEGO O2 Test3
12-27-01, 02:05 PM
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M&W UEGO O2 Test3
Tests 1 & 2 were done in warmer weather; temps were in the high 70s.
Test 3 only had a few individual cells changed since Test 2. BUT, the temperature was about 60F. After numerous runs, the manifold air temp was reading 30C/86F. But this is misleading as the IC outlet pipe was very cold to the touch and the intake manifold felt only warm. Kyle and I both agree that this air sensor is not accurate for measuring true
inlet air temp.
Due to this colder weather, the AFRs were reading about .2 higher. This equates to a range of 12.0 to 12.6. Before when it was warmer the range was 11.8 to 11.4. I went to the PIM voltage map and bumped the fuel from 103.9 to 105.0% at 4.5v and 4.0v. The colder weather was great for building boost. In 4th gear at about 3000rpm cruise, punching it caused the non-seq to go to max boost within 400rpm. It gave a very interesting graph while in ghost trace mode. Doing this revealed that the AFR was lagging due to the sudden rise in boost. To compensate, I went back to the PIM voltage map and then added 105.0% fuel to the 3.5v level, and added 1 to 2% in the fuel transition cells between 0 and 12.5PSI boost.
Test 3 only had a few individual cells changed since Test 2. BUT, the temperature was about 60F. After numerous runs, the manifold air temp was reading 30C/86F. But this is misleading as the IC outlet pipe was very cold to the touch and the intake manifold felt only warm. Kyle and I both agree that this air sensor is not accurate for measuring true
inlet air temp.
Due to this colder weather, the AFRs were reading about .2 higher. This equates to a range of 12.0 to 12.6. Before when it was warmer the range was 11.8 to 11.4. I went to the PIM voltage map and bumped the fuel from 103.9 to 105.0% at 4.5v and 4.0v. The colder weather was great for building boost. In 4th gear at about 3000rpm cruise, punching it caused the non-seq to go to max boost within 400rpm. It gave a very interesting graph while in ghost trace mode. Doing this revealed that the AFR was lagging due to the sudden rise in boost. To compensate, I went back to the PIM voltage map and then added 105.0% fuel to the 3.5v level, and added 1 to 2% in the fuel transition cells between 0 and 12.5PSI boost.
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