yodeixmall

i filled up 100 octane the other day in my IS350, i was just wondering if i get a little more power with this(i noticed a little but that may have been a placebo type effect)...or even if it effects my car in any way good or bad...(this might be a repeat thread)

ELL Y

iTrader: (1)

I think your car will just run richer

FiveOhNine

try a search, I found a bunch of stuff and I'm sure you'll find what you're looking for.

an example:
https://www.clublexus.com/forums/is-...d-threads.html

kickin8

iTrader: (1)

no point going beyond 91 octane?

Electric

Anything above 93-94 octane is a waste. Unless your car is tuned to run 100 octane, its not doing anything. The purpose of running higher octane is being able to lean out the fuel mixture and add timing (TUNING) and if you have a forced induction vehicle, by adding boost as well as tuning.

Magellan

As the searches will suggest, higher octane has nothing to do will adding more power. It’s only there to prevent knocking in higher compression engines. The same pseudo affect for 100 octane would be achieved if you took some dollar bills and threw them out the window while shouting, “Vroom, vroom!”

ELL Y

iTrader: (1)

haha. but open windows = more drag = slower car! Negative effect at the cost of quality coin!

bullet1

Exactly, unless your car is specifically tuned for 100 octane, you will do no good. It shouldn't have any negative effects on the engine, but definitely is a waste of money.

caymandive

iTrader: (2)

100 octane from my experience is a waste on the IS350 as everyone is saying. I once almost ran out of gas at the drag strip and had to throw in a few gallons of 100 to keep going and the car actually did worse.

Magellan

You’re right. How about just a placard in the rear window that says,

"Caution—Pass At Your Own Risk. This car uses 100 octane. ” ?

FiveOhNine

Normally that's true except in the rare case where
open windows + loud music = go faster

Add racing stripes and it's game over.

stash84

i used to put it in my mazda rx7 and it actually made it go faster/respond better

Kurtz

iTrader: (1)

The only common production vehicles where you'll see any gain from 100 octane are those that either:

Are tuned beyond factory specs

or

Have something else wrong with them that cause them to knock/ping on normal pump octane.

The first is great... in the second case the proper thing to do is fix the car.


It violates several nice bits of science for a car that's programmed for pump gas to otherwise see any advantage from higher octane gasoline.

ndk83

Ive found the same thing


Here in Dubai we have 95 ocatane and 98 octane, and i dont see any difference between the two, if anything i feel the car is faster with 95 ( dont know the psychological term for that haha)

Joe Z

iTrader: (10)

Interesting....

Any insight for as Cali guys that are forced to run 91... I feel like on track days the 100 properly mixed with the 91 would give us better results..
Approx goal would be to reach 93-94 octane.


Joe Z