100 octane race gas: 91 octane ratio? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GhostofAkina · 02-07-2013, 10:08 PM

I'm from California where they don't carry 93 octane but I found a gas station that has 100 octane. I was hoping someone out there could help me with a chart of how much 100 octane to 91 octane to come up with 93. Any thoughts?

Ocala FR-S · 02-07-2013, 10:13 PM

fatoni · 02-07-2013, 10:14 PM

dont waste your money

GhostofAkina · 02-07-2013, 10:16 PM

Quote:

Originally Posted by Ocala FR-S

You sir are a gentleman and a scholar.

GhostofAkina · 02-07-2013, 10:17 PM

Quote:

Originally Posted by fatoni

dont waste your money

Please elaborate.

fatoni · 02-07-2013, 10:30 PM

Quote:

Originally Posted by GhostofAkina

Please elaborate.

the price of 100 octane is crazy high. i cant see any gains from going from 91 to 93 noticable but you will notice the price increase. another downside is that if you do get a tune to make use of the couple extra octane points, you will be bound to stay within a certain radius of the station that offers 100

GhostofAkina · 02-07-2013, 10:36 PM

Quote:

Originally Posted by fatoni

the price of 100 octane is crazy high. i cant see any gains from going from 91 to 93 noticable but you will notice the price increase. another downside is that if you do get a tune to make use of the couple extra octane points, you will be bound to stay within a certain radius of the station that offers 100

Noted. Thank you for your input.

SLEEPER WRX · 02-07-2013, 10:45 PM

But wait a second...
Isn't the car tuned from the factory for 93 octane?
That's what is recommended - right?
I was told and read, that using 91 octane was OK
But if it's already set up for 93, and we put it in, we don't need to get a tune!

CaptainSlow · 02-07-2013, 11:32 PM

Just be sure the 100 octane isn't leaded. I'm not sure if they even offer leaded fuels out in CA, but I know at the tracks here in MI they'll have some 110 (somewhere around that), but it's leaded.

campy · 02-07-2013, 11:37 PM

Why does California not sell 93 octane?

Synack · 02-07-2013, 11:43 PM

Uhhhh, just get tuned for E-85!

I'm currently using a setup that allows me to flip a switch between a 93 tune and a E85 tune; 300whp and 350whp.

I just have to make sure that I run the gas down real low and fill with the other gas if I want to flip from one tune to the other.

joop1987 · 02-07-2013, 11:59 PM

Lots of race fuels are leaded. Don't put it into your car unelss you want to kill your catalytic converters.

boonFRS · 02-08-2013, 12:07 AM

Yup Fatoni is correct. I've tried 100 and didn't feel any major difference between 100 and 91. Butt dyno said that the throttle response is a tad better but again that's butt dyno. At $8.29 a gallon(when I pumped), it can get pretty pricey fast.

Calidrifter · 02-08-2013, 12:53 AM

Most if not all 100 octane here in Cali is unleaded.

We don't use E85 here, well at least in SoCal. Its eithe gas, hybrid or electric.

02-07-2013, 10:08 PM	#1
GhostofAkina Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Raven Location: California Posts: 72 Thanks: 28 Thanked 10 Times in 6 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	100 octane race gas: 91 octane ratio? I'm from California where they don't carry 93 octane but I found a gas station that has 100 octane. I was hoping someone out there could help me with a chart of how much 100 octane to 91 octane to come up with 93. Any thoughts?

02-07-2013, 11:32 PM	#9
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Just be sure the 100 octane isn't leaded. I'm not sure if they even offer leaded fuels out in CA, but I know at the tracks here in MI they'll have some 110 (somewhere around that), but it's leaded. __________________ Ultramarine 2013 Scion FR-S 6MT

02-07-2013, 11:43 PM	#11
Synack Boosted Join Date: Jul 2012 Drives: Sideways Location: Atlanta Georgia USA Posts: 2,377 Thanks: 388 Thanked 716 Times in 414 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	Uhhhh, just get tuned for E-85! I'm currently using a setup that allows me to flip a switch between a 93 tune and a E85 tune; 300whp and 350whp. I just have to make sure that I run the gas down real low and fill with the other gas if I want to flip from one tune to the other. __________________ *Nismo 370Z 300whp -> FR-S Turbo 450whp on E85 -> Z06 Corvette 500whp*

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02-07-2013, 10:13 PM	#2
Ocala FR-S Senior Member Join Date: Nov 2012 Drives: 2013 FR-S AT Argento Location: Ocala, Florida Posts: 217 Thanks: 92 Thanked 96 Times in 53 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)

02-07-2013, 10:14 PM	#3
fatoni Senior Member Join Date: Apr 2011 Drives: miata, mazdaspeed protege, ls430 Location: socal Posts: 4,416 Thanks: 599 Thanked 1,443 Times in 787 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	dont waste your money

02-07-2013, 10:45 PM	#8
SLEEPER WRX Senior Member Join Date: Aug 2012 Drives: 2013 BRZ Location: San Jose Posts: 193 Thanks: 2 Thanked 134 Times in 72 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	But wait a second... Isn't the car tuned from the factory for 93 octane? That's what is recommended - right? I was told and read, that using 91 octane was OK But if it's already set up for 93, and we put it in, we don't need to get a tune!

02-07-2013, 11:37 PM	#10
campy No rice, no life Join Date: Dec 2012 Drives: 2013 Asphalt FR-S Location: Jersey Shore Posts: 1,143 Thanks: 266 Thanked 1,019 Times in 388 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Why does California not sell 93 octane?

02-07-2013, 11:59 PM	#12
joop1987 Senior Member Join Date: Nov 2012 Drives: 2013 FRS, Raven, Auto Location: Hamilton, NJ Posts: 104 Thanks: 0 Thanked 36 Times in 21 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Lots of race fuels are leaded. Don't put it into your car unelss you want to kill your catalytic converters.

02-08-2013, 12:07 AM	#13
boonFRS Senior Member Join Date: Jul 2012 Drives: 2013 Scion FRS whiteout Location: Garage Posts: 395 Thanks: 322 Thanked 169 Times in 95 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Yup Fatoni is correct. I've tried 100 and didn't feel any major difference between 100 and 91. Butt dyno said that the throttle response is a tad better but again that's butt dyno. At $8.29 a gallon(when I pumped), it can get pretty pricey fast.

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