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Regular VS Premium
46 cr points
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30 / M / Hotlanta
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Posted 1/26/08
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.
419 cr points
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26 / M / CA
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Posted 1/26/08

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.
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26 / M / CA
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Posted 1/26/08

bboybowzer wrote:

I have a blacktop 4age 20v, which in japan would be okae to have but in America negative. they have 100 octane at gas stations, but only a few here.


any engine management?

I know a few people who run 13:1 compression on 91 oct, if youre worried about the high compression.
46 cr points
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30 / M / Hotlanta
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Posted 1/26/08

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.
13211 cr points
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L.A.
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Posted 1/26/08

bboybowzer wrote:

I have a blacktop 4age 20v, which in japan would be okae to have but in America negative. they have 100 octane at gas stations, but only a few here.


A blacktop should run OK on 91/93, anyway. I've got a lot of friends who've been running 20v motors on cali pump gas without any trouble, in some cases for years. I ran a JDM AE92-spec Hi-comp redtop for a while, and it never had any trouble with gas, either. (Although I killed it by throwing a rod in hard cornering during a trackday... stupid non-baffled pan.) I'm planning on a Blacktop for my AW11, actually.
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26 / M / CA
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Posted 1/26/08

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.
504 cr points
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28 / M
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Posted 1/26/08
yeah our cars in japan and australia run on petrol not gasoline so its kinda different we have premium unleaded which is octane but they have changed it to shell v-power.
122 cr points
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30 / M
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Posted 1/26/08

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
59245 cr points
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27 / M / Seattle WA
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Posted 1/26/08

Max_Archer wrote:


bboybowzer wrote:

I have a blacktop 4age 20v, which in japan would be okae to have but in America negative. they have 100 octane at gas stations, but only a few here.


A blacktop should run OK on 91/93, anyway. I've got a lot of friends who've been running 20v motors on cali pump gas without any trouble, in some cases for years. I ran a JDM AE92-spec Hi-comp redtop for a while, and it never had any trouble with gas, either. (Although I killed it by throwing a rod in hard cornering during a trackday... stupid non-baffled pan.) I'm planning on a Blacktop for my AW11, actually.


yeah i know its okae to run 91/93 I'm just saying its not the factory spec gas it should be taking. but If i had the chance to use 101 octane I would do it I hear it smells quite nice.


4wdcelica wrote:


bboybowzer wrote:

I have a blacktop 4age 20v, which in japan would be okae to have but in America negative. they have 100 octane at gas stations, but only a few here.


any engine management?

I know a few people who run 13:1 compression on 91 oct, if youre worried about the high compression.


nothing right now, just the blacktop ECU. I dont have any worries about it running on 91. From the shop I got the motor installed in, I was told it was the strongest running stock 20v in WA, so I'm not worrying about it dieing on me from using 91.
419 cr points
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26 / M / CA
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Posted 1/26/08

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.


But dude, i can run 87 and I just wont get the same power. /sarcasm
13211 cr points
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L.A.
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Posted 1/27/08

bboybowzer wrote:
yeah i know its okae to run 91/93 I'm just saying its not the factory spec gas it should be taking. but If i had the chance to use 101 octane I would do it I hear it smells quite nice.


It really does... Friend of mine was running VP 106 in his Silvertop at Willow Springs when we were at a trackday last year, stuff smells amazing.
1899 cr points
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M / Bay Area, Cali
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Posted 1/27/08

4wdcelica wrote:


bboybowzer wrote:

I'm all for premium grade, considering its like 3 octanes below what my motor uses sadly. If there was a place near me for 101 I'd use that.


If you live in California, its not hard to get 100+ octane at a pump.


I LIVE in california, and yet to see a 100+ octane pump
419 cr points
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26 / M / CA
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Posted 1/27/08
there are 3-4 places in the east bay and 4-5 up by Sac Raceway.
5352 cr points
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24 / M
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Posted 1/27/08
I hate it when people bitch about premium fuel.

a few dollar more won't kill you, if it does, you should downgrade to a economy car, people across the ocean pay more for gasoline than you do for premium.
36104 cr points
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34 / M / Cortlandt Manor, NY
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Posted 1/27/08

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!
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