xfeastonarsex

iTrader: (5)

89 same year as the car, lol

Rx7 922

i use 89 on regular basis but when i go raceing i always put in 100 octane i just use about 6-8 gallons @ $4.789

88fc3sw/HX83

C16

in2twins

55 gallons of 100 sittin in my garage

RX7withNitrous

93

SevenGirl

89 works better

NA86RULZ

I drive an NA, and I have heard that 87 is the best grade to use. Besides why spend all that extra money for 89, 91, or 93 ?

The Unsent

only the best for my baby. high octane!

harjms

ok now 89 is 10% ethenol right? in nebraska its like 3 cents less than 87...go figure... so would that be a smart chocie for an n/a?

slow87turbo

ok how about another variable. how many people run premix. wouldnt that raise the efective octane? i am wondering becouse when i skimped on the pre mix on a tank of premum and got some light detonation at WOT at about 7k. but not now that i got back to my excess amount of pre mix.

ej

nathantheman

i've always run 87 octane in my tII. stock boost. here in canada at 5000 feet elevation i think it really dosen't need 93 or 91 even. they were made for 87

live2drive15

iTrader: (4)

I use 89 sometimes but usually 87, I figured higher octane would help out but i guess not.

NCGNETO90

iTrader: (3)

Im cheap and plus i onl have N/A's. They dont need the good stuff!

C.N. 7

87, but thats because im broke

Evil Aviator

Ethanol-enriched gas is not necessarily higher octane, even though it does raise the octane level. For example, the fuel company could take 84 octane gas, add 10% ethanol, and come up with 87 octane. It is likely that a gas station selling ethanol-enriched 89 octane also sells ethanol-enriched 87 octane. Regardless, the important thing to know about alcohol is that it is much less powerful than gasoline (about 75-85kbtu/gal vs. about 110-120kbtu/gal), so while it will raise the octane rating, it will not make as much torque and horsepower.

Just like any other octane issue, the advantage of high octane is that the boost level of the engine can be raised past the normal knock limit imposed by low octane gas. This allows more fuel to be injected. While the fuel is less powerful, if you can add enough of it, the mass quantity will make up for the lower performance. This is why alcohol drag race cars can make a lot of power - they use less powerful fuel, but they use a whole lot of it.

I don't think your NA would get anything out of the extra octane unless it is in extremely poor condition and has a knocking problem.

FC3S-Rotary

N/A's can't burn all the high octane level. It doesn't use (burn) up all of the fuel efficiently, causing carbon build-up and all sorts of nasty gunk. The lowest is always better for N/A's. For the T2, high octane is better. Turbo or supercharged cars need the slower burning fuels to prevent pinging or knocking which is very hard on the apex seals. Slower burning, meaning higher octane.

JKM

For my 91 NA, I was using 93 octane gas for it since it seemed to work the best. But, I put in some fuel injector cleaner, filled it up with 87 and she works better than ever.

jreynish

iTrader: (2)

It is my understanding the premix Lowers the Octane in your gasonline the same as when you engine burns too much oil! However the little amount of Premix that is in there I would think that the change of octane woule be minute many 0.1 or 0.2 of a point difference!

And to answer your question i run premix!

Indy7373

I own a 91 NA and I only use 87 octane gas. Is this bad?

reamia

104 cam2 race fuel

Erk

87

Nghtstlkr7

i used to use 87 oct but i recently switched to 93 and she runs like a champ... thing is though i heard that the n/as run better off the cheap stuff..... ive got a 90 gtu

pillage6

I use 93 since I am boosted.

I would rather spend the extra money on gas and not on a blown engine due to knocking.

SureShot

My NA seemed to prefer 87.
The stock turbo is equally happy with any grade.

TII_FC3S

I put 91 in my TII, its the highest we get here in the Bay...