ethanol question

M

my 99

Member
#1
#1
Hi I have a 96 supercharged Mystic, love it by the way, it has basically a MI tune,where all gas doesn't have any ethanol in it I guess. The previous owner said to run it on premium nonethanol gas. I guess in Jan that won't be possible. So what's next I presume a retune? Kennedy's a good place?
 
shady-ooc

shady-ooc

Well-Known Member
#3
#3
i talked to my tuner(dan at pro-dyno in sc) about it and he told me that the car will run a little richer but you will be fine.
 
M

my 99

Member
#4
#4
my concern and that of the guy that sold it is leaning it out, when we raced, anytime you used alcohol you had to go way up on jetting, I know "old school" thinking, but fuel consumption went way up. So my thinking is at higher boost the car won't get enough fuel, right? thanks for educating my dumb ass on this
 
M

my 99

Member
#7
#7
actually have an a/f gauge but I don't think it works right. What would it be wired up too? Would that a/f let you know soon enough if you went way lean, as in parts out the side of the block lean?:confused:
 
M

my 99

Member
#8
#8
I have some info on ethanol from kennedys in buffalo as follows:
Your friends are correct it takes 2.2 times as much alcohol as gas 10%
ethanol changes air fuel ratio by 2.2%. This is not a problem with a NA car
but with a supercharger it can be.We only tune on the dyno.
I also got an email from kwik fill saying that some of their stations are still ethanol free, however I can't find any. I've tried from buff to syracuse. If they're out there it must be a secret. Hope this helps.
 
M

my 99

Member
#9
#9
Just confirmed ethanol free gas is alive and well in canada. I found some 91 octane ethanol free gas at petro canada, I beleve it exists at some other stations as well. I know everyone else has put their cars in hibernation,but just for future reference.
 
Realspeeddan

Realspeeddan

Well-Known Member
#10
#10
If you can find the original shop that tuned the car they can update the Stoichiomethric A/F ratio in the tune to compensate for the ethanol. Stoich for all gas is 14.65:1
Stoich for 10% ethanol is 14:09:1

If you have a air/fuel ratio gauge but it is not a "wideband" gauge it is useless for checking full throttle performance. In fact it is worse than useless. It is dangerous becauseit will still read "rich" even if the car is 13.5:1 which is actually dangerously lean. Get a wideband.
 
M

my 99

Member
#11
#11
Just back from syr. bought some 100 octane unleaded race gas, relatively cheap,that will get me through the end of the driving season. Will use the mix to store the car.
As to the tuning it was done in detroit, so it probably won't go back there. I have a guage, but the guy I bought it from doubted it worked right. How do you know what setup you have? I believe you when you say if it doesn't work right, it could be bad. Even with an accurate guage wouldn't it be too late if you were really on the supercharger? Seems it couldn't react fast enough.
Over the winter I'll figure out the tuning question, and get educated on how all this stuff works. Thanks everyone for the help.
 
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