100 Octane (Race Fuel) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MikeyBatz · 11-29-2014, 12:40 AM

Hey Everyone,

I ran into something interesting today. A Sunoco near me seems to sell SS100 or 100 octane "race" fuel. Has anyone ever try running this high octane fuel? Any interesting effects or problems?

Lonewolf · 11-29-2014, 12:46 AM

On a stock FA20 motor with a factory tune, the 100 octane would be a waste of money (of no real benefit....and it would probably hurt your gas mileage). Anything above 94 octane on the stock tune would seem to be overkill unless you were boosted or tracking the car in 100 degree heat.

DarkSunrise · 11-29-2014, 01:11 AM

I've been running 100 octane on the track for the extra protection against detonation. Would highly recommend it for that, but not needed on the street for a stock engine.

jeepmor · 11-29-2014, 01:31 AM

Quote:

Originally Posted by Lonewolf

On a stock FA20 motor with a factory tune, the 100 octane would be a waste of money (of no real benefit....and it would probably hurt your gas mileage). Anything above 94 octane on the stock tune would seem to be overkill unless you were boosted or tracking the car in 100 degree heat.

Could you please elaborate on why this is the case? Is it due to the electronics pulling back to provide a certain performance output?

I asked because I've read the electronics keep a tight leash on the engine parameters and wonder if it would self regulate output regardless of the energy level provided by the fuel. ie - pull back for higher octane fuel and kick it up for lower grade fuel.

Reaper · 11-29-2014, 01:39 AM

The ecu will pull timing if it senses knock. If there is no knock it leaves the timing where the factory set it. If you put in a higher octane fuel that doesn't make more power. You would have to add timing to make more power. You just made it less likely to see detonation.

Reaper · 11-29-2014, 01:40 AM

Why not run an e85 tune?

billwot · 11-29-2014, 11:00 AM

Higher octane fuel does NOT contain more energy or make more power...it only has a higher detonation threshold.

BTW, I think you'll find that the 100 octane is LEADED fuel, an absolute no-no for catalyst equipped engines.

Freetime · 11-29-2014, 11:08 AM

Quote:

Originally Posted by billwot

Higher octane fuel does NOT contain more energy or make more power...it only has a higher detonation threshold.

BTW, I think you'll find that the 100 octane is LEADED fuel, an absolute no-no for catalyst equipped engines.

The sunoco here that sells 100 octane is unleaded. And quite expensive

Shit Luck · 11-29-2014, 11:37 AM

Quote:

Originally Posted by Freetime

The sunoco here that sells 100 octane is unleaded. And quite expensive

the Sunoco down the road has 100 at the pump. its great for when you know you are gonna go beat on a boosted car.

1GiantTurtle · 11-29-2014, 02:38 PM

Since I can't get 93 here I just mix 100 with 91 to achieve 93, quiets the crickets just a bit

11-29-2014, 12:40 AM	#1
MikeyBatz Member Join Date: Oct 2014 Drives: Scion FR-S Location: Virginia Posts: 86 Thanks: 13 Thanked 76 Times in 19 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	100 Octane (Race Fuel) Hey Everyone, I ran into something interesting today. A Sunoco near me seems to sell SS100 or 100 octane "race" fuel. Has anyone ever try running this high octane fuel? Any interesting effects or problems?

11-29-2014, 01:11 AM	#3
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,798 Thanks: 2,187 Thanked 4,243 Times in 2,221 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	I've been running 100 octane on the track for the extra protection against detonation. Would highly recommend it for that, but not needed on the street for a stock engine. __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

11-29-2014, 01:39 AM	#5
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	The ecu will pull timing if it senses knock. If there is no knock it leaves the timing where the factory set it. If you put in a higher octane fuel that doesn't make more power. You would have to add timing to make more power. You just made it less likely to see detonation. __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

11-29-2014, 01:40 AM	#6
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	Why not run an e85 tune? __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

11-29-2014, 02:38 PM	#10
1GiantTurtle Space for Rent Join Date: Apr 2014 Drives: 2014 6MT ToyoBaru86ScionMonogram? Location: Pacific Ocean/SoCal Posts: 1,054 Thanks: 1,000 Thanked 1,136 Times in 526 Posts Mentioned: 31 Post(s) Tagged: 1 Thread(s)	Since I can't get 93 here I just mix 100 with 91 to achieve 93, quiets the crickets just a bit __________________ ToyoBaruScionGT86hachiRokuBRZMonogram Instagram: 86turtle Instagram: 86turtle

11-29-2014, 12:46 AM	#2
Lonewolf Senior Member Join Date: Dec 2011 Drives: Moped Location: CA Posts: 4,300 Thanks: 4,905 Thanked 2,132 Times in 1,195 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	On a stock FA20 motor with a factory tune, the 100 octane would be a waste of money (of no real benefit....and it would probably hurt your gas mileage). Anything above 94 octane on the stock tune would seem to be overkill unless you were boosted or tracking the car in 100 degree heat.

11-29-2014, 11:00 AM	#7
billwot Senior Member Join Date: Mar 2014 Drives: '11 Cayman , '14 Camry, '11 Tacoma Location: Eastern NC Posts: 509 Thanks: 57 Thanked 396 Times in 198 Posts Mentioned: 5 Post(s) Tagged: 1 Thread(s)	Higher octane fuel does NOT contain more energy or make more power...it only has a higher detonation threshold. BTW, I think you'll find that the 100 octane is LEADED fuel, an absolute no-no for catalyst equipped engines.

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