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34 / M / Cortlandt Manor, NY
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Posted 1/27/08

Fialchar wrote:


4wdcelica wrote:

by your standards I can still hit 20psi on 87 octane and the only negative thing I would see would be reduced power. Hah ok.


..you should Never use anything less than 91 (as the bare minimum) if you have a forced induction ride. Period.

And lol@people thinking octane stops at 100, there's 129 octane fuel out there


What cars use 129 octane?

Sorry, fairly new to the scene. I love cars but know very little of the inner workings.
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34 / M / Cortlandt Manor, NY
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Posted 1/27/08

4wdcelica wrote:

there are 3-4 places in the east bay and 4-5 up by Sac Raceway.


Does that mean you can put that in a regular car? What woudl it do? Jeez... I have so much to learn! And I thought I know enough! It's depressing.
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22 / F / Nebraska
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Posted 1/27/08

exopoet wrote:


Nucular wrote:


4wdcelica wrote:


Nucular wrote:

If you have a newer car, you really don't have to worry about putting a lower octane gas in your car and hurting it. Engine management is to the point that a car's computer can back off fuel and ignition timing enough to not cause any harm to your engine if you happen to pump 87 octane into your BMW. You just won't get the gas mileage or performance that you would normally.


And the risk of detonation and destroying your engine?

I would never dream of putting anything less of 91(premium) in a M car.

Nice reading comprehension.

Or maybe I wasn't clear enough. Newer cars have computer controlled fuel and ignition timing. If the computer detects a knock (from the knock sensor), it is able to adjust the timing to prevent detonation and preignition. But like I also said, the consequences are reduced engine performance and reduced fuel economy.

I'm not telling people to only pump 87 into their "premium" cars. I'm just saying it isn't absolutely detrimental (no risk of complete engine failure) in doing so.


This is good to know. I should tell my friends about it! Thanks!


That isn't something to really rely on.
While I do agree that it's not detrimental to engine failure...
Like it was stated, gas mileage and engine performance will decrease quite dramatically.


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22 / F / Nebraska
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Posted 1/27/08

4wdcelica wrote:


Nucular wrote:


4wdcelica wrote:


Nucular wrote:

If you have a newer car, you really don't have to worry about putting a lower octane gas in your car and hurting it. Engine management is to the point that a car's computer can back off fuel and ignition timing enough to not cause any harm to your engine if you happen to pump 87 octane into your BMW. You just won't get the gas mileage or performance that you would normally.


And the risk of detonation and destroying your engine?

I would never dream of putting anything less of 91(premium) in a M car.

Nice reading comprehension.

Or maybe I wasn't clear enough. Newer cars have computer controlled fuel and ignition timing. If the computer detects a knock (from the knock sensor), it is able to adjust the timing to prevent detonation and preignition. But like I also said, the consequences are reduced engine performance and reduced fuel economy.

I'm not telling people to only pump 87 into their "premium" cars. I'm just saying it isn't absolutely detrimental (no risk of complete engine failure) in doing so.


Hah if you say so.

It will have reduced power, yes. But I for one wouldn't put a drop in my tank. But by your standards I can still hit 20psi on 87 octane and the only negative thing I would see would be reduced power. Hah ok.

'Hey whats that noise? oh dont worry thats just knock, my 'smart' PCM will just tune it out." There is a reason why cars say PREMIUM FUEL ONLY on the gas lids. And I'm pretty confident that its not just for power output and fuel economy.


Actually...it is.
The recommended O.E.M specs (as fars as dealing with octane rating, oil weight rating, etc) for a car is rated thus to attain optimum power output, fuel mileage, etc., in regards to factory tuning.
Its only recommended...
Not something that is all THAT crucial to follow...
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26 / M / CA
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Posted 1/27/08
So an engine running 11.5:1 compression would be A-OK with a fuel that ignites too quickly?
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26 / M / Seattle WA
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Posted 1/28/08

exopoet wrote:


4wdcelica wrote:

there are 3-4 places in the east bay and 4-5 up by Sac Raceway.


Does that mean you can put that in a regular car? What woudl it do? Jeez... I have so much to learn! And I thought I know enough! It's depressing.


iono if you'd want to cough up the dough to use it in a regular car. Race gas is more used towards racing cars or cars on the track. it would burn too fast for street driving i think
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21 / F / ☆The WorLd☆
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Posted 1/28/08
deasel?? hahah! dunno~
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23 / M / GU
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Posted 1/28/08
regular.

because gas is WAY too much these days,
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M / Middle of NO WHERE!
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Posted 1/28/08
Premium, coz if you have lesser Octane it would be a big problem for you and your car maintenance.
Posted 1/28/08
my car runs on regular (85-87 octane) I will be poor if I have to pay for anything above midgrade for a daily driver (88-90) and I guess I will pay premium only if I get a car that needs it xD
I highly doubt that I'll ever purchase racing fuel (100+ octane) xP
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34 / M / Cortlandt Manor, NY
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Posted 1/28/08

bboybowzer wrote:


exopoet wrote:


4wdcelica wrote:

there are 3-4 places in the east bay and 4-5 up by Sac Raceway.


Does that mean you can put that in a regular car? What woudl it do? Jeez... I have so much to learn! And I thought I know enough! It's depressing.


iono if you'd want to cough up the dough to use it in a regular car. Race gas is more used towards racing cars or cars on the track. it would burn too fast for street driving i think


But you can, right? Will it harm my engine? I wouldn't think of using it. My heating oil is already killing me... I don't think I want to bother with it. I just want to know if that's something that can be done without any mods on the car.
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26 / M / Seattle WA
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Posted 1/28/08
yeah but its not practical is what I'm saying
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24 / M / Racetrack
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Posted 1/28/08
I currently use 93 premium here because of my conservative tune. When summer hits, I will be back on Sunoco 100.
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20 / F / Texas:D
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Posted 1/28/08
moslty i thin everybody would think Premium becuz i think it betta or w.e.. :DD i was choose the same thing:DD
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M / Middle of NO WHERE!
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Posted 1/28/08

GreekCotan wrote:

my car runs on regular (85-87 octane) I will be poor if I have to pay for anything above midgrade for a daily driver (88-90) and I guess I will pay premium only if I get a car that needs it xD
I highly doubt that I'll ever purchase racing fuel (100+ octane) xP


agreed, but what will you do if you have a GT 2k8?
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