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Discussion Starter #1 (Edited)
All other things the same, E85 had 3 times less HC, CO and NO vs 91 gas. So it is true, adding some E85 should help a little bit to pass smog.
EGR Delete - it will show on NO especially on 91 (E85 cools the engine)

91 HC CO NO
15mph 44 0.07 611
25mph 19 0.01 1106 (FAIL)

E85
15mph 14 0.03 233
25mph 8 0.01 40
 

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Yes e85 does have a cooling effect if engine is tuned for e85 otherwise adding e85 to 91 on a stoxk fuel system makes engine run leaner thjs making NOX levels higher.... ask me how I know ;)
 

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Discussion Starter #3
Good point. This car with the test results has dual map for 91 and E85. If you run stock ECU car do not put more than 2 gallons of E85 into the full tank. And do that only for smog ( in other words don't go crazy on boost with stock ECU and "some" E85 in the tank).
 

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E85 takes around 30% more fuel to make same power as gas so diluting 91 with e85 gives you a leaner burn. Better off not mixing any e85 in there at all and jsut getting car into shape so it'll pass the emissions test.

Oem ecu does run rich and there is a power gain to be had from running a little e85 in the tank... the richer mixture reduces NOX on emissions tests where leaner/hotter burning mixture will increase NOX emissions.

I haven't tested what exact amount of e85 in 91 will start to raise the NOX levels but for sure 3 gal in full tank will raise it over what standard 91 would be
 
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