Sweet_85_Bird

I have a 2.8 and was wonderin if 93 octane does more harm than good or what?I just wanna know if i need to use it?
Thanks

Jason E

Nope, you'll get slightly better mileage and a bit more power...at least I do!!

85f-bird

wow, another 85 firebird. hey, how many 85's do you see in your area, there are a total of 5 that i see around here, 6 including mine, they're kinda rare.

well about the octane, i normally use 89, that's what i was told our engine is made to run on, (midgrade) but occasionally i use 93, especially for races. I'd say 93 won't hurt your engine, but remember that we do have a low compression ratio, so 93 octane isn't nessecary, just consider it an option.

Jason E

I believe 2.8s only require 87 octane...at least my '89 only needs it. GM made a habit throughout the '70s and '80s that only the high-performance engines (aka TPIs, etc.) needed anything more than 87

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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s
Alpine Alarm w/ Keyless entry
IROC tailights/tinted windows

Real men drive V6s!

FAST RS

Ok every one who is stuck on 87 octane and says it does nothin do this..
Buy like 3 tanks of 92 and see how your car runs and then go abck to 87 and tell me the difference you will feel.
i use 92 all the time except when im low on cash ill use 87 but i notce a difference in my cars proformance and gas mileage

Sweet_85_Bird

Hey,85fbird,we ahve about 3 runnin around not including mine.Yeah they are gettin pretty rare.But i live in memphis and we have 3rd gen fbodys EVERYWHERE.I LOVE IT!!!!

I EAT T/A

OK, now its a fact that higher octane burns faster which means you don't get better gas mileage, its not worse maybe a mile or two less, but its not better. Octane ratings are ping ratings also, and higher octane will in time hurt your injectors if you only need 87. That is what I've read and been told by mechanics many times.

TomP

Um, actually, higher octane burns slower. It's a more "controlled" burn, and is less suseptible to detonation. This is why you can run with more (advanced) timing when you use higher octane.

Higher octane can't hurt. It might not help, but it can't hurt. An injector can't tell the difference; it's just squirting whatever it gets.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards

Garmer

I EAT T/A,

I have to disagree with you. My dad used to run 87 octane in his van, and then decided to run 93. His MPG have gone up 2, so I agree with TomP!

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91 RS Camaro
3.1L
Cat Back System, K&N filter,modified air box, Fastchip Stage 2, 160 thermo, Rapidfires and Bosch Wires, soon to come: Homemade Ram Air,and maybe power pulleys, 5 Air Horns

Brian K

I run a compromise.. Always 89 in my vehicles....

Monkie

Maybe the MPG would go up but with the higher octane costing more wouldnt it make more sense to use the 87 grade?


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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

85f-bird

my dad used 89 octane from day one, and the car lasted 233,000 miles, and when i got it at 220,000 it still had enough umph, to kick the crap outta lots of v6's, and even run nice with v8's. I'd say, 89 minimum, and if your feeling nice, go with 93.

Jason E

Monkie,

No one would substitute 93 for 87 and expect the $$ spent to even out. Yes the mileage is better, but not enough to cover the cost difference between the 2.

I would use 89, but the chip dictates 93. I could run 89, but then I wouldn't get as much of an advantage from the chip. Besides, around here 89 costs only .05 less than 93, so I figure if I'm gonna spend .10 more for 89, why not go the extra .05 to 93??



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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s
Alpine Alarm w/ Keyless entry
IROC tailights/tinted windows

Real men drive V6s!

Kevin S

Same here.Unless I have a good payday!Then my baby gets the good stuff.

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http://www.camaroforum.com/
http://v6fbody.com/
http://nethirdgen.org/
http://clubs.yahoo.com/clubs/tristatecamaro

[This message has been edited by Kevin S (edited October 30, 2000).]

BoneMaro

So is the final word that higher octane is better? Everyone stick up your vote.

Jason E

I know some will disagree, but I vote yes!! I've run them both for extended periods of time, and I like 93 better. For .15 a gallon, or about 2.50 a tank, why not????

FAST RS

Why do people back east have 93 octane and people on the west coast have 92???

85f-bird

the midwest rules, we get to choose between the two. Just depends on the station around here.

TomP

There's no final word, Bone.. 87 is all our engines really need. Some computer chips require 92 because of the more agressive timing curve.

FASTRS, I think it has to do with California and their emissions and smog. Sunoco stations over here even sell 94 octane!


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

Jason E

Hey Tom, how much is 94 in NJ? Around here it's like 1.81, or about .08 above 93!!

FAST RS

I wana move out there for that 94 stuff lol.. Hear i pay 1.90 down to 1.79 for 92 during the sumer it went past 2 bucks.

Jason E

Highest I paid was 1.80 at one point. Its still like 1.73-1.79. Premium hasn't gone down at all around here! ARGH

TomP

Depends on the station, but it's around 1.70 to 1.85...


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

scoob8000

if your engine doesnt call for higher than 87, then your wasting your money, tho running a higer octane couldnt hurt, but your not gonna notice a difference unless you have a modified engine, or a engine in need of a tuneup.. as far as prices, i had to get rid of my chip, it would ping too bad on 87, and with gas prices set at 1.57 for 87, i cant afford to be running super, tho once in awhile i do treat her to a fillup of the good stuff.. as far as grades it just depends on the station, sunoco always has super 94 and bp's best is 93, while sheetz has 92 around here.. but should i need i can still get 108 cam2 fuel at my 86 station up here for 2.50 something a gallon..

FAST RS

DUDE would 108 octane kill our engine my frind has a car and it gets 50 miles per tank runs 108 octane and he "clames" 3000 HP but i know it has allot of ponnies

85f-bird

3000hp? are you sure about that. maybe 300, max, and i'd think it'd be real hard to get 300 hp and keep 50mpg.Now, theres that new Honda, that gets somehting like 60mpg, but only has a 3 cylinder, that also has an electric power source, so it's half gas, half electric motor, or sorry engine. But that car makes something like 55hp or so. I just can't see 300hp and 50mpg, they'd like cancel each other out. Heck, when making super cars,chevy and F*rd both were able to make 800hp cars, but they would only get about 10mpg max.

Kevin S

Damn,does he run top fuel
3000hp is way to much.Especially for the street.
Even the trains that run by the house don't put out that much.Like 1500 per engine.
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http://v6fbody.com/
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[This message has been edited by Kevin S (edited November 06, 2000).]

FAST RS

I ment 50miles per TANK my bad and its a 20 gallon tank it has wheelie bars a Hudge blower with 2 holey carbs its sweet he brings it to cruisers every now and then cuz he has to fill up to go there and fill up to go home...

TomP

Have him show you a dyno sheet- I doubt anything with 3,000 HP is streetable.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!