Pass Emissions on E85 temporarily?
Thread Starter
Mazzei Formula
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Joined: Jun 2006
Posts: 3,021
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From: Birmingham, Al
Pass Emissions on E85 temporarily?
Possibly about to move to an emissions state. Car currently is no where near legal. No airpump, no cats, no egr etc 
Has anyone in an emissions state successfully passed simply by running e85 and/or a mix to bring down hydrocarbons?
Figured I could simply adjust duty cycles 33% for idle and part throttle, fill up with e85 or straight e98 (have access to lab grade) just enough to pass emissions then refill with 93 / retune?
Of course I'd also throw on my stock main cat for visual inspection
Has anyone in an emissions state successfully passed simply by running e85 and/or a mix to bring down hydrocarbons?
Figured I could simply adjust duty cycles 33% for idle and part throttle, fill up with e85 or straight e98 (have access to lab grade) just enough to pass emissions then refill with 93 / retune?
Of course I'd also throw on my stock main cat for visual inspection
i use E85 to supplement cars that have too many issues for the owners to be able to address and are on time contraints with the DMV.
it should be extremely easy to pass emissions with a cat, maybe even possible without but the CO levels might be difficult to maintain. if it wasn't for the fact they still check for a cat and smog pump i might have tried it without a cat on my own car.
it should be extremely easy to pass emissions with a cat, maybe even possible without but the CO levels might be difficult to maintain. if it wasn't for the fact they still check for a cat and smog pump i might have tried it without a cat on my own car.
Last edited by RotaryEvolution; Apr 4, 2014 at 06:55 PM.
Thread Starter
Mazzei Formula
iTrader: (6)
Joined: Jun 2006
Posts: 3,021
Likes: 145
From: Birmingham, Al
i use E85 to supplement cars that have too many issues for the owners to be able to address and are on time contraints with the DMV.
it should be extremely easy to pass emissions with a cat, maybe even possible without but the CO levels might be difficult to maintain. if it wasn't for the fact they still check for a cat and smog pump i might have tried it without a cat on my own car.
it should be extremely easy to pass emissions with a cat, maybe even possible without but the CO levels might be difficult to maintain. if it wasn't for the fact they still check for a cat and smog pump i might have tried it without a cat on my own car.
But Can't believe they actually look for an airpump as well. :/
I'm thinking about to install a electric corvette air pump and stock emission tube with OEM cat. To see if I can trying to pass emissions. Do you you guys really thinks its possible.
Specs of my car
13b Street port
SINGLE turbo
E85 fuel
currently full exhaust
complete emission delete.
Specs of my car
13b Street port
SINGLE turbo
E85 fuel
currently full exhaust
complete emission delete.
Joined: May 2005
Posts: 1,012
Likes: 45
From: North Dallas, TX
I'm actually quite interested in this too. E85 is for the most part alcohol that burns down into CO2 and water vapor. Seems like that would really help with passing emissions.
Joined: Mar 2001
Posts: 31,833
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From: https://www2.mazda.com/en/100th/
i looked a few years ago, as in california this would be a nice thing. i didn't really find any results at the time though, however we do know SOME things, and can make an educated guess.
1. OEM's sell flexi fuel cars, these pass smog.
2. one of the things a rotary has a hard time with is unburned hydrocarbons. in really broad strokes, an engine burns hydrogen and oxygen. gasoline is a hydro-carbon. it is a bunch of hydrogens on a carbon, CH18 if i'm not mistaken (18 hydrogens on 1 carbon, plus a bunch of other crap)). ethanol, being an alcohol has the hydrogen, but with fewer carbons. it is something like CH12 (12 hydrogens on a carbon).
since there are fewer carbons, unburned hydrocarbons should be fewer too.
this is also, incidentally why it takes more volume of E85 to have the same energy as gasoline, 12 hydrogens is 30% less than 18 hydrogens.
1. OEM's sell flexi fuel cars, these pass smog.
2. one of the things a rotary has a hard time with is unburned hydrocarbons. in really broad strokes, an engine burns hydrogen and oxygen. gasoline is a hydro-carbon. it is a bunch of hydrogens on a carbon, CH18 if i'm not mistaken (18 hydrogens on 1 carbon, plus a bunch of other crap)). ethanol, being an alcohol has the hydrogen, but with fewer carbons. it is something like CH12 (12 hydrogens on a carbon).
since there are fewer carbons, unburned hydrocarbons should be fewer too.
this is also, incidentally why it takes more volume of E85 to have the same energy as gasoline, 12 hydrogens is 30% less than 18 hydrogens.
