Some alky data results for e testing.

[BoostKillsStres]

Emissions testing Directscan data averaged over steady state part of tests sans cat. Looks like with alky, NOx went up and mixture was slightly leaner but HC and CO went down slightly. Appears quite a bit more alky would be needed for any significant reduction in emissions.

Regular street chip
MPH RPM InjPW EGRDC COOLANT ADV O2V BLM
25 1520 2.99 43.39 174 27.93 389.98 126
15 1539 3.14 47.07 180 28.79 397.83 128

25 MPH 15 MPH
HC 145 147
CO% 0.88 0.91
NOx 390 414

Regular street chip w/ 16oz of 91% IPA to 3/8ths tank of fuel.
MPH RPM InjPW EGRDC COOLANT ADV O2V BLM
25 1520 2.99 41.21 181 27.96 377.12 130
15 1584 3.18 50.25 185 28.87 383.83 127

25 MPH 15 MPH
HC 142 142
CO% 0.78 0.85
NOx 465 422

 

[gofstbuick]

The readings are too close to each other. To see if Alky has made a difference, compare the CO2 and O2 readings. O2 can be used to determine lean and CO2 is used for combustion efficiency.

 

[BoostKillsStres]

I'm not totally sure what you mean by The readings are too close to each other as after adding the alky the car was driven on the rollers for 5 mins to let the fuel system circulate and blend the alky before the 2nd set of tests were run. Thanks for the o2 and co info.