What octane??

[supraGhost]

I put 87 in for the first time today. its making me nervous. i usually put 89 in because i cant afford the 93. what is the supra supposed to run on from factory? is there any difference in the different fuels you put in (ex. my moms minivan performs no better on 93 than 87)

thanks

 

[BlackMKIII]

91 or higher. No less.

 

[supraGhost]

lol alright i will try to cancel this stuff out with some 93 lol

 

[suprahero]

I use only 93, but I'm pretty sure I read somewhere that JJ uses 87 or 89 octane for some reason, and I know he's got one, I just can't remember it.

 

[zurud]

If I don't plan on boosting, I just use 87. I think the factory said premium unleaded only.

 

[pimptrizkit]

i belive my factory book say 87 or higher unleaded only.

none the less. if you hear pinging at all you need better fuel.

i run 92/94 no less weather i go chevron , shell, arco, or handy andys.... god forbid....

though i have a fresh motor, and has very little carbon build up, well i'll like to keep it that way , also with high octane you can have more persise ignition timming for a better power cure, this is why some cars run better on premium fuel, since the knock sensor is altering timing due to pinging the human ear can not pick up.... atleast over alot of other noises..


now the twist is, 87 burns hotter and has more bpu then 92 if i rember correctly, but is closer to igniting it's self in hot temps..

 

[NocturnalKitty]

lol

ur mom's minivan isn't a high performance vehicle.

i have never run anything lower than 91 octane in my 89 n/a or my 87t. even my new project car drinks no lower than 91 octane.

 

[crazysupra2JZ]

well, there is a big warning sticker on the fuel door saying not to use anything lower than 93... so i just don't use anything lower.

 

[jetjock]

I use only 93, but I'm pretty sure I read somewhere that JJ uses 87 or 89 octane for some reason.

Tis true. My 87 owner's manual says to use 87 and that's pretty much all I've used for 20 years with zero problems. I did use higher when I was modded way back when but since returning to near stock it's run 87.

I believe 89+ model years changed that to 91 but not sure. My book also says slightly improved performance can be had with a higher octane and that makes sense because of how the ESA system works but on the rare times I've used higher I never noticed anything.

A fuel's octane rating is nothing more than a measure of knock resistance and just allows you to make more power if the engine is designed for it. Doesn't make more in and of itself ie; using higher octane on a stock engine (or more octane than any engine "needs") is a waste of money.

Fwiw I've never seen a Supra stickered for 93 but that doesn't mean they don't exist.

You're breaking my heart about fuel prices btw. Trying tanking some private aircraft up these days. One of mine costs close to $1800 every time it's done. I watched $4000 disappear into another recently. At least that didn't come out of my pocket.

 

[Doward]

93 all the way here. I'd rather have a slower burn, than detonation

And how the hell can you not afford it? An extra .20/gallon, put in 15 gallons, is only $3. THREE DAMN DOLLARS.

Skip McDonalds for the day.

 

[hottscennessey]

3 dollars is a lot less than an engine rebuild...

 

[1-2clutch-u]

94 in ohio

 

[BlackMKIII]

And how the hell can you not afford it? An extra .20/gallon, put in 15 gallons, is only $3. THREE DAMN DOLLARS.

Skip McDonalds for the day.

OMG. Best post EVAR! I've been telling myself that for YEARS.

 

[jetjock]

^ Keep telling yourself that as you slave away your entire life. A buck here and there over a lifetime isn't chump change, especially considering inflation and loss of investment potential. The vast majority of people (at least those who work at it) get rich slow, not quick. It's your money though...

To the OP: Use what the engine is designed for. If it's been modded use higher octane. If it's stock use what the book calls for. The vast majority of blown engines result from bad tuning, improperly done mods, bad maintenance, or some other form of incompetence on the part of the owner...not from using the wrong fuel.

 

[Kai]

heh - the difference here is minimal in terms of cost.

Average fillup on 95 RON is £1.029 a litre, so 60 litres is £61.74 ($121.80). 98 RON is £1.099 a litre so the same size fillup would cost you £65.94 ($130.08).

Thats a difference of £4.20 ($8.28) which isn't even enough to buy you a McDonalds extra value meal...

If you cant afford that minimal difference on a fillup - you should go buy a Toyota Aygo Diesel

 

[dbsupra90]

The vast majority of blown engines result from bad tuning, improperly done mods, bad maintenance, or some other form of incompetence on the part of the owner...not from using the wrong fuel.

poor tuning yes, but i've seen a lot of blown motors from wrong fuel too. you can't expect to run high boost on a big turbo with pump gas. i guess you can kinda see that as tuning, but i consider tuning a/f and timing, not octane.

i'll throw this out there too, altho it has been mentioned before. you will NOT get more horsepower by running higher octane fuel. if you do, it wasn't tuned right or you were running too much boost for the octane.

 

[iHartSupra]

I always use the highest octane available. Living within your means might be the only way to truly gain wealth, but $3.00 is within my means. Be safe.

 

[Doward]

^ Keep telling yourself that as you slave away your entire life. A buck here and there over a lifetime isn't chump change, especially considering inflation and loss of investment potential. The vast majority of people (at least those who work at it) get rich slow, not quick. It's your money though...

To the OP: Use what the engine is designed for. If it's been modded use higher octane. If it's stock use what the book calls for. The vast majority of blown engines result from bad tuning, improperly done mods, bad maintenance, or some other form of incompetence on the part of the owner...not from using the wrong fuel.

Totally correct. But hey, if that $3 is getting spent either way, then I'm not so worried about it

My '04 Colorado Sport gets 87 octane. Why? Because it is bone stock, and the book calls for it. I spend the money on extra octane on my toys, but that's it

 

[pimptrizkit]

im glade i dont pay for most of my fuel used i fill up about three times a week, so roughly twelve times a month.. so if i was to use regular i would almost be able to fill my tank once from the money i save through the month.


i hate thinking about how much fuel i use each month.... but i love driving so i guess it's worth it since i've worked this style of job for 3 years.

 

[NeatOman]

I'm sure you could run a turbo car with 87 just fine.... but i wouldn't get so heavy footed

I know both my N/A really did not like 87... very happy with 89. I swear i would get 15mpg with 87 and around 20+ with 89 or 93. I used 93 because my timing was @ 14.

On some cars 93 will make you're car run slower and wast more gas, on others Way better.

87 is suited for cars with equal X and Y bore

When Y is longer (sports car) you want more compete, long, burning gas = Premium!

That i could only say about N/A for sure /\/\/\

As for my Supra, it seams happy any ware... but warms up faster with 93, so thats what i pump.

I HAVE A DUTY LITTLE SECRET!!! you know what makes 93 what it is, ADDITIVES MUAH HA HA HA HA HA HA HA

http://science.howstuffworks.com/gasoline4.htm

They put "NOS" in you're gas thats why it gets better gas mileage sometimes when you pump better gas.

By the way.. E85 kills plants and IS toxic when you use it in any E85 car (more ->) MUAH HA HA HA HA