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Old 08-29-2002, 12:29 AM   #1
wayoutwest
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Question No MTBE 91 octane vs. MTBE 91 octane

Is either of these better for our engines?? Just curious since 76 stations advertise no MTBE now.
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Old 08-29-2002, 01:21 AM   #2
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Soon all CA gas stations will be MTBE free. I believe there is a certain amount of knock reduction that comes from the MTBE, but I don't think there's a difference at the same octane level. I'm sure somebody'll correct me if I'm wrong.

MTBE is being outlawed in CA gas because all underground gas tanks leak to some extent, and MTBE pollutes the groundwater after it seeps into it.
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Old 08-29-2002, 02:30 AM   #3
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IIRC, losing the MTBE will raise the upper octane limit from 91 to 93 octane.
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Old 08-29-2002, 03:27 AM   #4
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i dont think thats true... the reason we get 91 is partly because consumption of 92 was so great that there was not enough to go around, so instead of shortages of 92 they watered it down with 87. in the midwest and east coast enough people use 87 so they can retain higher octanes... so says the article from sport compact car. sounds possibly true..
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Old 08-29-2002, 03:56 AM   #5
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UGH, so it's true, the highest (easily obtained) octane in SoCal is 91??? I hope dasubaruguy is right and the octane levels are going to be on their way up.....

Wonder if I'll notice a difference since I've always fed it 92+....
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Old 08-29-2002, 02:08 PM   #6
somebody else
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Quote:
Originally posted by SFastWRX
MTBE is being outlawed in CA gas because all underground gas tanks leak to some extent, and MTBE pollutes the groundwater after it seeps into it.
By implication, the rest of the componets of our pump gas, are perfectly fine to drink. Here's to your health, tap-drinkers!

And, yes, you will notice the difference in octane. Fortunately for those of us in or near Newport Beach, there is a Union 76 station at San Miguel and what used to be Ford Rd that has 100 octane unleaded at US$4.50 a gallon or there-abouts. Even a little bit (say 1/4) of this in your tank makes a difference.

--scott
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Old 08-29-2002, 02:16 PM   #7
WagonMonster
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**sigh**

When Driving through New England this summer I saw 94 Octane for $1.60 a gallon.

We're getting SO shafted here
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Old 08-29-2002, 02:24 PM   #8
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Quote:
Originally posted by somebody else
By implication, the rest of the componets of our pump gas, are perfectly fine to drink. Here's to your health, tap-drinkers!

And, yes, you will notice the difference in octane. Fortunately for those of us in or near Newport Beach, there is a Union 76 station at San Miguel and what used to be Ford Rd that has 100 octane unleaded at US$4.50 a gallon or there-abouts. Even a little bit (say 1/4) of this in your tank makes a difference.

--scott
Woah woah.... 100 octane? Oh yeah..... 1/4 that 3/4 "91" makes a nice overal 93 Thanks for the heads up, I know where I'm filling up
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Old 08-29-2002, 02:26 PM   #9
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Costa Mesa. On superior there is a motorcycle race shop that has 108 octane on pump for 4.50 a gallon. Mucho better then 100 octane at the same price. They will pump it in your car.
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Old 08-29-2002, 02:41 PM   #10
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Quote:
Originally posted by I am b
Costa Mesa. On superior there is a motorcycle race shop that has 108 octane on pump for 4.50 a gallon. Mucho better then 100 octane at the same price. They will pump it in your car.
are you sure it's not leaded?

i heard that most gas over 100 octane is leaded. it doesn't matter for you aaron because you removed your cats, but for people with any cats in their uppipe or downpipe/midpipe...you must not use leaded gas or you will destroy the cats. yeah, yeah...everyone knows this, but i'm mentioning it just in case.
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Old 08-29-2002, 02:43 PM   #11
I am b
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Quote:
Originally posted by eric m.


are you sure it's not leaded?

i heard that most gas over 100 octane is leaded. it doesn't matter for you aaron because you removed your cats, but for people with any cats in their uppipe or downpipe/midpipe...you must not use leaded gas or you will destroy the cats. yeah, yeah...everyone knows this, but i'm mentioning it just in case.
No, that is good info to give out to people just in case. Yeah I don't have any besides the high flow.

and Val is trying to say that you hate me.
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Old 08-29-2002, 03:04 PM   #12
holysin
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cool, you answered my next question, I just have a high flow in the exhaust, that should be fine with leaded/race fuel then?
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Old 08-29-2002, 03:14 PM   #13
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Quote:
Originally posted by eric m.


are you sure it's not leaded?

i heard that most gas over 100 octane is leaded. it doesn't matter for you aaron because you removed your cats, but for people with any cats in their uppipe or downpipe/midpipe...you must not use leaded gas or you will destroy the cats. yeah, yeah...everyone knows this, but i'm mentioning it just in case.
i didn't know that, so good thing you did.

dan
(n00b 4 life)
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Old 08-29-2002, 03:24 PM   #14
I am b
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Quote:
Originally posted by holysin
cool, you answered my next question, I just have a high flow in the exhaust, that should be fine with leaded/race fuel then?
but do you have an up-pipe?? That is the most important one.
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Old 08-29-2002, 03:42 PM   #15
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Yup I have an up pipe (and down pipe), the only cat on my car is the high flow cat in the exhaust.

That's what will make getting my smog certificate interesting...
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Old 08-29-2002, 03:44 PM   #16
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FYI the highest race fuel that is unleaded is 108... You can purchase this through VP fuels or you can continue to purchase the 100 from 76 stations or the 101 Trick Fuel from certain Texico's...
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Old 08-29-2002, 03:50 PM   #17
eric m.
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Quote:
Originally posted by dachoe


i didn't know that, so good thing you did.

dan
(n00b 4 life)
i have to put a disclaimer on all my technically related posts now, or else evaider will post after me telling me how stupid i am for trying to sound smart when in reality i'm an idiot.

and aaron, you know i don't hate you...or val. there is nothing but love in the SCIC.



(and aaron and val, too!)
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Old 08-29-2002, 05:32 PM   #18
Unit 91
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Quote:
Originally posted by eric m.


are you sure it's not leaded?

i heard that most gas over 100 octane is leaded. it doesn't matter for you aaron because you removed your cats, but for people with any cats in their uppipe or downpipe/midpipe...you must not use leaded gas or you will destroy the cats. yeah, yeah...everyone knows this, but i'm mentioning it just in case.
The possibility isn't only destroying the cats, but causing the valves to seat incorrectly. Back in the day leaded gasoline was used in order to have the valves in the heads seat correctly by providing a soft cushion for the valves to come to rest against and prevent damage to the head and allow the valve to seat correctly.
With the advent of hardened valve seats this lead in the gasoline became unneccesary. The valve seats were no longer at danger of damage from the hard material of the valve and the valve was insured a proper seat every time.
The damage is more than just to your cats. In reality the fuel system can also be damaged, injectors clogged, etc. A car must be designed to accept leaded fuel or you're just going to break it.
The moral of the story kids - leaded fuel in an unleaded needing car is bad. MMMMkay.
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Old 08-29-2002, 05:46 PM   #19
holysin
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Default YAYAYAYAYAYAY!

Did I mention yay?

Just talked to the smog check people in newport beach, they just plug into the computer to check us AWD cars... and my car with the existing mods doesn't flash any CELs Hell, might even leave the chip attached (actually that might be a good idea... )

So the only thing I have to worry about is visible inspection

YAY!!!!!!!!!!!!!!!!!!
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Old 08-29-2002, 05:47 PM   #20
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Quote:
Originally posted by ryaneatworld


The possibility isn't only destroying the cats, but causing the valves to seat incorrectly. Back in the day leaded gasoline was used in order to have the valves in the heads seat correctly by providing a soft cushion for the valves to come to rest against and prevent damage to the head and allow the valve to seat correctly.
With the advent of hardened valve seats this lead in the gasoline became unneccesary. The valve seats were no longer at danger of damage from the hard material of the valve and the valve was insured a proper seat every time.
The damage is more than just to your cats. In reality the fuel system can also be damaged, injectors clogged, etc. A car must be designed to accept leaded fuel or you're just going to break it.
The moral of the story kids - leaded fuel in an unleaded needing car is bad. MMMMkay.
Shut up. What do you know about cars :monkey:

Val
"KING OF SCIC"
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Old 08-29-2002, 05:51 PM   #21
Unit 91
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I know quite a bit actually. Being in the business kind of forces you to know.
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Old 08-29-2002, 05:56 PM   #22
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Quote:
leaded fuel in an unleaded needing car is bad

what about unleaded in a desial? my mom was telling me of how she did that to the ambulance a couple of times.
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Old 08-29-2002, 06:02 PM   #23
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Quote:
Originally posted by ryaneatworld
I know quite a bit actually. Being in the business kind of forces you to know.
Really? Where do you work??? :monkey:

Val
"KING OF SCIC"


Sorry just post whorin'
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Old 08-29-2002, 06:12 PM   #24
eric m.
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Quote:
Originally posted by Val

Really? Where do you work??? :monkey:
Val
"KING OF SCIC"
Sorry just post whorin'

ryan, don't fuel his fire. he obviously knows you work at Irvine Subaru as the CEO and president of SPI Motorsports, and also that you have been there for 3 years now, and that you know more about Subarus (and Mustangs) than anyone else in the SCIC.

meanwhile, val has a 600hp rally car, so i guess he's cool too.

and thanks for the info on leaded gas. someone told me the only issue was the cats, and i knew that couldn't be correct. they say you learn something new everyday. but on the SCIC....you learn 2 things!!!!!
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Old 08-29-2002, 06:16 PM   #25
Unit 91
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I wouldn't say I know more than everyone. I know what I know. Thats it.
As far as being all those fancy titles, I think thats a bit overboard.

Anyways, I'm out.
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