Smog results on E85...
07-18-2011, 10:37 AM
#1
Smog results on E85...
Went and got smogged on e85.
If you could fail for emissions being too clean I suspect I would have.. The two smog techs working on it kept saying "Soooo clean???"..
AFR was about as dead nuts stoich as I could make it for the two idle speeds..
Catless up-pipe.. Exhaust was from an 03 with unknown mileage..
E85 ftw again....
If you could fail for emissions being too clean I suspect I would have.. The two smog techs working on it kept saying "Soooo clean???"..
AFR was about as dead nuts stoich as I could make it for the two idle speeds..
Catless up-pipe.. Exhaust was from an 03 with unknown mileage..
E85 ftw again....
07-18-2011, 02:02 PM
#9
Yah - it will lean you out / may aid in passing if your tune is off.. As long as you aren't testing NOx it helps..
If you aren't AWD and you use too much the high combustion temps from leaning out will increase NOx and could cause a fail..
The reason it helps just has to do with leaning rich cars out - not really burning cleaner..
But in a straight e85 car - it does burn cleaner as well
If you aren't AWD and you use too much the high combustion temps from leaning out will increase NOx and could cause a fail..
The reason it helps just has to do with leaning rich cars out - not really burning cleaner..
But in a straight e85 car - it does burn cleaner as well
07-19-2011, 09:48 AM
#11
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If I knew how to I'd hack the ECU to add flex fuel functions. Then you just put whatever you want in the tank.
Flex fuel cars used to use an ethanol sensor to determine what the mix was. I had a plan to add one of these to the now unused TGV position input. But too many of the sensors on flex fuel cars were failing. So now some of the cars are programmed to spot a refueling event and temporarily divert the fuel trim corrections for a few minutes to increase or decrease the % of ethanol it thinks is being consumed. This is then used by other tables.
You'd need a regular pump tune and a full E85 (or higher tune) and let it blend smoothly between. You'd need a second set of tables for every table that normally changes for E85. So this could only be done on ECUs with lots of room.
/threadjack
Flex fuel cars used to use an ethanol sensor to determine what the mix was. I had a plan to add one of these to the now unused TGV position input. But too many of the sensors on flex fuel cars were failing. So now some of the cars are programmed to spot a refueling event and temporarily divert the fuel trim corrections for a few minutes to increase or decrease the % of ethanol it thinks is being consumed. This is then used by other tables.
You'd need a regular pump tune and a full E85 (or higher tune) and let it blend smoothly between. You'd need a second set of tables for every table that normally changes for E85. So this could only be done on ECUs with lots of room.
/threadjack
07-22-2011, 09:25 AM
#14
If I knew how to I'd hack the ECU to add flex fuel functions. Then you just put whatever you want in the tank.
Flex fuel cars used to use an ethanol sensor to determine what the mix was. I had a plan to add one of these to the now unused TGV position input. But too many of the sensors on flex fuel cars were failing. So now some of the cars are programmed to spot a refueling event and temporarily divert the fuel trim corrections for a few minutes to increase or decrease the % of ethanol it thinks is being consumed. This is then used by other tables.
You'd need a regular pump tune and a full E85 (or higher tune) and let it blend smoothly between. You'd need a second set of tables for every table that normally changes for E85. So this could only be done on ECUs with lots of room.
/threadjack
Flex fuel cars used to use an ethanol sensor to determine what the mix was. I had a plan to add one of these to the now unused TGV position input. But too many of the sensors on flex fuel cars were failing. So now some of the cars are programmed to spot a refueling event and temporarily divert the fuel trim corrections for a few minutes to increase or decrease the % of ethanol it thinks is being consumed. This is then used by other tables.
You'd need a regular pump tune and a full E85 (or higher tune) and let it blend smoothly between. You'd need a second set of tables for every table that normally changes for E85. So this could only be done on ECUs with lots of room.
/threadjack
-- Ed