what type of gas?

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Geedy21

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Does it matter what type of gas i use? I have been using 93 SHELL gas.. Nothing else. I drive this car every chance i get and just about every time i drive it i have to go to the gas station.. Gas isnt getting any cheaper and this car can drink. As you other LS onwers know. Now the person i bought the car from told me the she put regular gas in it (87) and she had to have something repaired dealing with the fuel system.. My ??? is what type of gas should i be using?
 
You should be using anything over 91 octane.. I use shell v-power most of the time and sometimes, use 89 (93*89/2=91.5).. So it averages out to be 91.5.. I do use v-power most of the time though.. Just when I can't afford it I put 89 and average it out.. If you run regular, the octane rating doesn't satisfy the compression ratio in the LS.. I can't remember if using a lower octane when you should be using higher results in pre-detonation or..? Been a year since I learned that..
 
you COULD tune it to run e85 like as i'm planning to do. supposedly the mpg goes down but i'm ok with that :)
 
Ususally the higher octane fuel will yield a higher mpg in a LS because it uses knock sensors, If the ecm detects detonation it lowers timing and therefore lowers your mpg. If you drive it conservatively you can run a lower octane fuel with probably no decrease, but if you really think about it, in a total fill up from emty the difference from 87 to 93 octane is something like 3 dollars big woop. what do you get for mileage? also any check engine lights on?
 
The manufacture says 91 or better. You should have a label on the inside of the gas filler door stating that. Don't use less, not worth it, your Lincoln LS is a performance auto.
 
2000lsv8 said:
you COULD tune it to run e85 like as i'm planning to do. supposedly the mpg goes down but i'm ok with that :)
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I seriously doubt you can do this. the higher the octane, the slower the fuel mixture ignites. the higher compression engine will cause the faster detonating 87 or 89 octane to prematurely detonate before the plug can fire.

if 87 octane is 2.99/gal, then 89 is usually 3.09 and 91/93 can be found at 3.19.

is $2-4 dollars that big a deal?
 
#1fordfan said:
I seriously doubt you can do this. the higher the octane, the slower the fuel mixture ignites. the higher compression engine will cause the faster detonating 87 or 89 octane to prematurely detonate before the plug can fire.

if 87 octane is 2.99/gal, then 89 is usually 3.09 and 91/93 can be found at 3.19.

is $2-4 dollars that big a deal?
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Yes, I think that the LS compression is too high for anything over E15.
 
Geedy21 said:
Does it matter what type of gas i use? I have been using 93 SHELL gas.. Nothing else. I drive this car every chance i get and just about every time i drive it i have to go to the gas station.. Gas isnt getting any cheaper and this car can drink. As you other LS onwers know. Now the person i bought the car from told me the she put regular gas in it (87) and she had to have something repaired dealing with the fuel system.. My ??? is what type of gas should i be using?
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Okay, so your goal is to save money.
Using lower octane results in lower mileage. You will lose money, not save it.

If you want/need to save money on gas, the LS is the wrong car for you.

Anyway, you can get better mileage by putting a glass full of water in the cup holder. Drive so that you don't slosh out any of the water.
 
if you cant afford the gas that the car requires (as stated by the sticker on the fuel door) then sell the LS and get your self a focus or a civic
 
E85 is over 100 octane, I forget the exact number. Compression can't be too high as standard 91 is much lower octane. You can tune for E85 but I don't think the rubber seals are made to handle the alcohol.

joegr said:
Yes, I think that the LS compression is too high for anything over E15.
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E85 is not 100 octane, whatever grade you choose at the pump is the grade that you get, along with ethanol.
you are confused.
 
your right E85 isn't 100 octane...it's higher...about 105 octane

in equal volumes of petroleum gas vs. corn gas ....the potential energy is lower in E85

alot of forced induction guys tune for it because of the high octane but you have size up your injectors by about 20% to avoid lean issues in stoich

like someone posted, E85 is highly corrosive and will damage certain parts of your fuel system
 
E85 is blended with lower octane gasoline, the octane on the pump is the octane that the gas is blended too. If you ran 100% E85, than you would have higher octane levels.
 
1LoudLS said:
if you cant afford the gas that the car requires (as stated by the sticker on the fuel door) then sell the LS and get your self a focus or a civic
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+1

This car isn't made for individuals with shallow pockets. If you can't even afford the right gas good luck with maintenance
 
brentalan said:
E85 is over 100 octane, I forget the exact number. Compression can't be too high as standard 91 is much lower octane. You can tune for E85 but I don't think the rubber seals are made to handle the alcohol.
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Yes, I missed the boat on that one. It looks like the real octane figure is in the mid to upper 90s. (The 100+ figure comes from calculating it in a way that doesn't fit well with reality.)
 
I'm not sure if it's a coincidence, but every time I put 87 in my car, it seemed like something happened with my coils.
 
#1fordfan said:
I seriously doubt you can do this. the higher the octane, the slower the fuel mixture ignites. the higher compression engine will cause the faster detonating 87 or 89 octane to prematurely detonate before the plug can fire.

if 87 octane is 2.99/gal, then 89 is usually 3.09 and 91/93 can be found at 3.19.

is $2-4 dollars that big a deal?
Click to expand...

This may be true for a normal 3.9 LS engine. however since i'm stroking mine and having custom pistons made i can adjust the compression to my desires and therefore run e85.

with the following information in mind,


http://www.seco.cpa.state.tx.us/re_ethanol.htm

lets say i was planning to run e85 with a stock 3.9. yes the higher octane will take more "time" to ignite with stock timing. however since a large part of a custom tune is advancing degrees of spark to get more power we could theoretically add even more degrees of spark and have more power.

and also since our AJ-V8s are Jaguar engines and VERY common in Europe where e85 is also a VERY common fuel i'm sure our engines can withstand the alcohol content



Octane Rating
The most important characteristic of gasoline is its octane rating; in general, the higher a fuel's octane rating the better the engine will perform. Pure ethanol made from renewable plant sources has less energy content than gasoline, which means more trips to the pump, but it has an octane rating of 113, compared with 107 for methanol and about 86 to 94 for gasoline.

Corrosion: because the alcohol in ethanol corrodes aluminum, FFV components are made of stainless steel and E85 pumps must be modified or manufactured with stainless steel to prevent corrosion. Repeated exposure to E85 also corrodes the metal and rubber parts in older engines (pre-1988) designed primarily for gasoline.
 
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