how much hp do you lose from 93 to 91 octane?
02-28-2005, 06:49 AM
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how much hp do you lose from 93 to 91 octane? My car was great on 93 octane, however since i came to montreal, they only sell 91 octane, one station sells 94 but they put an additive in it and put ethanol in it also. My car got KR and blew a cat from the very first tank of gas, Well it went downhill from there. Are some ls1s like this? Just curious
02-28-2005, 12:59 PM
#2
Hey what's going on ....
I would check your O2 sensors. If you blew out your cats, you may have trashed your O2 sensors as well.
Mike, I run 91 and even 89 without an issue from time to time, especially when its cool out. During the dead heat of the summer I will run 93 exclusively.
I would atap your car and check your O2s as well as Ltrims ect to make sure everything is ok.
I would check your O2 sensors. If you blew out your cats, you may have trashed your O2 sensors as well.
Mike, I run 91 and even 89 without an issue from time to time, especially when its cool out. During the dead heat of the summer I will run 93 exclusively.
I would atap your car and check your O2s as well as Ltrims ect to make sure everything is ok.
02-28-2005, 01:41 PM
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thats the thing, its not ok, my ltrims are positive for whatever reason and im getting KR when its only 58 degrees out!!! can you imagine summer temps!!! Ive ataped it with efi live v6, i sent the logs to certain peeps, im gonna clean the maf as thats the only thing i havent done. A couple people said my o2s arent switching fast enough however they are only 5k old and im not throwing an o2 code, but i do get 10mpg and i dont smell gas. I checked for air leaks, couldnt find any. sunoco 93, never had a problem for a year, come here, first tank and its all downhill from there! When i say moved here, i mean i moved to Montreal, Quebec, i question the quality of gas as i know most of the stations put ethanol in the gas, we have 94 up here but that has ethanol 10% so its not a true 94 octane rating.
02-28-2005, 03:29 PM
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Oxygenated gas is the Devil.
If you could find the true chemical formulation I would
go in and change the stoich value in the PCM to be the
right value. The evil socialist gummint likes to feed you
this pizzwater because it de facto leans out older carb
vehicles. But it just gives modern, feedback EFI cars a
bad rash. If it makes your car unpleasant to drive, that
just gives all those closet sandal wearing envirodorks
a woody.
If you could find the true chemical formulation I would
go in and change the stoich value in the PCM to be the
right value. The evil socialist gummint likes to feed you
this pizzwater because it de facto leans out older carb
vehicles. But it just gives modern, feedback EFI cars a
bad rash. If it makes your car unpleasant to drive, that
just gives all those closet sandal wearing envirodorks
a woody.
02-28-2005, 04:43 PM
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hey jimmy are you messing around? i think shell and esso are the only ones who dont oxygenate their gas. i tried shell, but the car doesnt wanna go back to normal like it was in the states!! errrrrrrrrrrrrr.
02-28-2005, 05:04 PM
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Originally Posted by 92SilverSHO
hey jimmy are you messing around? i think shell and esso are the only ones who dont oxygenate their gas. i tried shell, but the car doesnt wanna go back to normal like it was in the states!! errrrrrrrrrrrrr.
and they also had a bad batch of gas come out of their
Tampa refinery,on Memorial Day that messed up a whole
lot of people, ruined their gas tank fuel senders.
Seriously, oxygenated gas is meant to push emissions on
older cars, I guess the bureaucrats don't know or don't
care that modern cars try and correct it out.
If a tankful of good stuff doesn't help then you may have
to look a little deeper. Maybe running so shitty, for so long,
has other consequences (like you're deep into the low
octane table, you have strange crust on the plugs or
injectors from the alcohol's tendency to hold water in the
fuel, or whatever).
02-28-2005, 05:16 PM
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Originally Posted by 92SilverSHO
My car was great on 93 octane, however since i came to montreal, they only sell 91 octane, one station sells 94 but they put an additive in it and put ethanol in it also. My car got KR and blew a cat from the very first tank of gas, Well it went downhill from there. Are some ls1s like this? Just curious
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03-01-2005, 08:29 AM
#8
I hate to dissapoint you Mike, but the sunoco you were buying here had ehtanol in it as well, at the 10% you get now.
Check your fuel filter as well as plugs at this point. Sounds like you may have sucked up some crap in your gas tank, clogged your fuel filter, and maybe even fouled your plugs at the same time.
Done a complete tune-up, reset the pcm, then see how the car reacts. FYI, a slightly positive Ltrim isn't anything to get worked up about, especially if the car is stock tune. But if you have a big difference between the two sides or really high values (anything above +3.0 would start to be a concern), then you have some issues.
Good luck.
Check your fuel filter as well as plugs at this point. Sounds like you may have sucked up some crap in your gas tank, clogged your fuel filter, and maybe even fouled your plugs at the same time.
Done a complete tune-up, reset the pcm, then see how the car reacts. FYI, a slightly positive Ltrim isn't anything to get worked up about, especially if the car is stock tune. But if you have a big difference between the two sides or really high values (anything above +3.0 would start to be a concern), then you have some issues.
Good luck.
03-01-2005, 10:52 AM
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my values at WOT are like +5 and at partial throttle go up to +8. only time im negative is at idle and BARELY, -0.8!! I dont remember them putting ethanol in the gas from the suburbs at the tank. i thought NY and CALI only had that done. I know in canada, its Montreal, and vancouver i think.
03-01-2005, 11:31 AM
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Originally Posted by The Alchemist
I hate to dissapoint you Mike, but the sunoco you were buying here had ehtanol in it as well, at the 10% you get now.
Check your fuel filter as well as plugs at this point. Sounds like you may have sucked up some crap in your gas tank, clogged your fuel filter, and maybe even fouled your plugs at the same time.
Done a complete tune-up, reset the pcm, then see how the car reacts. FYI, a slightly positive Ltrim isn't anything to get worked up about, especially if the car is stock tune. But if you have a big difference between the two sides or really high values (anything above +3.0 would start to be a concern), then you have some issues.
Good luck.
Check your fuel filter as well as plugs at this point. Sounds like you may have sucked up some crap in your gas tank, clogged your fuel filter, and maybe even fouled your plugs at the same time.
Done a complete tune-up, reset the pcm, then see how the car reacts. FYI, a slightly positive Ltrim isn't anything to get worked up about, especially if the car is stock tune. But if you have a big difference between the two sides or really high values (anything above +3.0 would start to be a concern), then you have some issues.
Good luck.
No intent to hijack, but are you saying that sunoco's 94 is essentially fake? Because when I put that in my car, I'd swear she doesn't perform as well as on Sunoco 93. I use Sunoco exclusively, BTW. Maybe that Ethanol could explain it.
EDIT: hey 92silverSHO I have probably seeen you around. where are you in Bensalem? do you take street road eastbound often? That would be so funny if that was you.
03-01-2005, 11:45 AM
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Not talking about my LS1 but my GN is totally octane dependant. I raise and lower my boost in small increments to match the gas in my car. Sunoco 94 is definitely higher octane in practice (not just a number). I have to tweak my boost for every octane point change. I run 17 psi on 94. I am in Ottawa so I am getting the exact same gas as you in Montreal. Ottawa's gas arrives in a pipeline from Montreal.
Also, as far as I know there is no oxygenated gas in Canada at all.
Also, as far as I know there is no oxygenated gas in Canada at all.
03-01-2005, 12:53 PM
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i used to work on ST road, Right behind outback steakhouse and across from applebees. I would make a left out of it and go home towards the racetrack, make the right at TGI fridays. But this was last year. black z28, cutout, no tint, i had chrome 10 spoke SS wheels.
03-01-2005, 12:55 PM
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BJm, there is, goto Petro canadas site, its oxygenated, in Montreal, vancouver, Shell doesnt use Oxygenated gas, but PETRO def does. May sound dumb, but i just didnt think the car would run lean as soon as i put the first tank of the gas up here in, and i cant pin the problem on anything else as of yet, but its really killing my mileage and power(knock retard).
03-01-2005, 01:01 PM
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from Petros website.
Petro-Canada offers several alternative fuels in select locations, including:
Propane – at many service stations across Canada.
Compressed natural gas – at some stations in the Vancouver area.
Oxygenated gasoline: gasohol, or gasoline with ethyl alcohol – at selected stations in Montreal (SuperClean* 94) and a bulk plant for farm customers in the London, Ont. area.
Petro-Canada offers several alternative fuels in select locations, including:
Propane – at many service stations across Canada.
Compressed natural gas – at some stations in the Vancouver area.
Oxygenated gasoline: gasohol, or gasoline with ethyl alcohol – at selected stations in Montreal (SuperClean* 94) and a bulk plant for farm customers in the London, Ont. area.
03-01-2005, 01:30 PM
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Hi 92SilverSHO.
I run my car exclusively on 91 octane (Esso, Irving, Ultramar). Never had a single problem so far with it (382ci, 10.6:1cr).
I filled the tank twice last summer with Petro Canada 94 and didn't saw a difference in overall performance. I don't know if it was my imagination (I'm no expert in gas) but the car was prone to stall more often at idle with the 94 (computer has been reprogrammed since then and idle has been raised from 700 to 800, stalling issue solved).
How do you like our roads?
( 
).
I run my car exclusively on 91 octane (Esso, Irving, Ultramar). Never had a single problem so far with it (382ci, 10.6:1cr).
I filled the tank twice last summer with Petro Canada 94 and didn't saw a difference in overall performance. I don't know if it was my imagination (I'm no expert in gas) but the car was prone to stall more often at idle with the 94 (computer has been reprogrammed since then and idle has been raised from 700 to 800, stalling issue solved).
How do you like our roads?
( ).
03-01-2005, 01:53 PM
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your damn roads!!!! i hit a massive hole in the middle of summer! i think it hurt the car! i dont plan to take my car out till May 1st. How far are you from St Leonard? are you in the MFBA? i am.
03-01-2005, 01:54 PM
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Originally Posted by Blue Hawk
How do you like our roads? ( ).
( ).That is interesting about the Petro-Canada 94 since I have never seen it anywhere in Ottawa. In Ottawa Petro Canada only sell 91. Esso sells 92. The only 94 I use (or can get) is Sunoco. If you see any Pioneer stations they sell 93 octane which is supposedly Sunoco 94 relabelled so Sunoco appears higher.
From what I have read, your mileage will be quite low with oxygenated fuels. In Ontario they will be enforcing the use of ethanol blends over the next few years.
03-01-2005, 01:55 PM
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the funny part is they say PA, where i was from had the worst roads rated by the truck drivers association of America, however. They were a walk in the park compared to this ****. You would think they would devise a better way of paving the roads with better material. Especially with all the taxes!! dont get me started on the taxes! errrrrrrr our registration is 400 this year! insane i tell you!!! i paid 35 in the states!
03-01-2005, 01:57 PM
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damn you guys get good gas, we get stuck with the ****! Shell and esso i think dont have ethanol in it. Either way its making my car run very lean and getting KR and bad mileage. If i dynoed my car, she wont be anywhere near what i dynoed i bet you.
03-01-2005, 01:58 PM
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well i know i-95 they are doing construction, it was a longtime coming, but after its done, it will be fine again. Where i lived the roads werent bad at all. i know theres a stretch in NY, going to washington bridge where its pothole city!!