89 Octane Ethanol Free vs 91 10% - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JonnyQuest264 · 11-08-2016, 09:20 AM

Hey all, picking up my new (to me) 13 FR-S this week. Here in NE Florida we have a good supply of e-free gas, with one exception. It's 89 octane. I've been using it in my motorcycles with great results.
I know the minimum octane recommendation is 91 (US).
Is using the 89 octane e-free an option, even if maybe applying some OTC octane booster? Or should I stick with 91 octane 10%?

The car only has 22k miles, and the chirping TSB has already been taken care of. Just looking out for the future on my newly acquired investment.

Thanks!

Tcoat · 11-08-2016, 09:27 AM

Quote:

Originally Posted by JonnyQuest264

Hey all, picking up my new (to me) 13 FR-S this week. Here in NE Florida we have a good supply of e-free gas, with one exception. It's 89 octane. I've been using it in my motorcycles with great results.
I know the minimum octane recommendation is 91 (US).
Is using the 89 octane e-free an option, even if maybe applying some OTC octane booster? Or should I stick with 91 octane 10%?

The car only has 22k miles, and the chirping TSB has already been taken care of. Just looking out for the future on my newly acquired investment.

Thanks!

I would stick to the 91 even if it has corn juice. The recommended rating is 93 the REQUIRED minimum is 91. Although you would not really hurt anything by running 89 the car will pull so much timing to prevent knock that you will take a large performance hit. Adding octane booster is not a replacement for using the proper octane in the first place.

D_Thissen · 11-08-2016, 10:14 AM

No..89 isn't an option.

86Boyz · 11-08-2016, 12:47 PM

I used 89 a few times just for the heck of it when I was in Florida. It didn't make a difference in performance to me and probably shortened the life of the engine in the long run.

Buy 93 premium and stick with it. Shell V-Power Nitro+ is a great option.

Tcoat · 11-08-2016, 01:07 PM

Quote:

Originally Posted by 86Boyz

I used 89 a few times just for the heck of it when I was in Florida. It didn't make a difference in performance to me and probably shortened the life of the engine in the long run.

Buy 93 premium and stick with it. Shell V-Power Nitro+ is a great option.

Ya it will probably now only last 999,999,999,999.8 hours instead of 1,000,000,000,000.

86Boyz · 11-08-2016, 01:12 PM

Quote:

Originally Posted by Tcoat

Ya it will probably now only last 999,999,999,999.8 hours instead of 1,000,000,000,000.

That's a big difference. It is as if you had a trillion dollars and were considered a trillionaire but now you are only a billionaire and are looked down upon and can't feed your family.

gmanvilla1@gmail.com · 11-08-2016, 03:56 PM

Or go with OFT tune and corn fuel. You will never go back.

Sent from my iPhone using Tapatalk

humfrz · 11-08-2016, 04:06 PM

Quote:

Originally Posted by JonnyQuest264

Hey all, picking up my new (to me) 13 FR-S this week. .........Thanks!

CONGRATULATIONS on your new purchase and WELCOME to ..... The Forum....

Yep, as generally recommended, use the highest octane gas available at your local gas station.

humfrz

humfrz · 11-08-2016, 04:09 PM

Quote:

Originally Posted by Tcoat

Ya it will probably now only last 999,999,999,999.8 hours instead of 1,000,000,000,000.

...... you needed that ....... you're ah getten ...... that ah way again .....

humfrz

Tcoat · 11-08-2016, 04:21 PM

Quote:

Originally Posted by humfrz

...... you needed that ....... you're ah getten ...... that ah way again .....

humfrz

You mean correct?

MurderousPandas · 11-08-2016, 04:47 PM

Strange. I use 93 and my timing gets pulled around 6k by a couple degrees. I couldn't imgaine 91, or even worse, 87. I'm glad our cars are capable of pulling timing, but it can only pull so much until knock happens. Even if the car seems to run fine, if you give it gas it surely won't. It fires and functions, but it won't run like it's supposed to, which can wear and damage components. I'm not sure if anyone here is aware of the spark plugs, but you do have to lift the engine to get all of them. Just an FYI, so run higher octane, i'd take 95 or even 100 if possible.

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Tokay444 · 11-08-2016, 04:50 PM

Food for thought. Ethanol has an effective octane rating of 160 in a direct injection application.

JonnyQuest264 · 11-08-2016, 05:43 PM

Quote:

Originally Posted by humfrz

CONGRATULATIONS on your new purchase and WELCOME to ..... The Forum....

Yep, as generally recommended, use the highest octane gas available at your local gas station.

humfrz

Thank you!

Pretty excited to pick it up tomorrow!

Cole · 11-08-2016, 05:46 PM

Hahahaha hahahaha

Jesus Christ, does no one read the fucking manual anymore?

In regards to the fuel pump TSB, you'll get crickets again. Here's a very simple solution, instead of worrying about the noise your pump is making (which, let's be honest, is normal operation for it) try driving your car between 4 and 7 thousand RPM more often.

11-08-2016, 09:20 AM	#1
JonnyQuest264 Junior Member Join Date: Oct 2016 Drives: 4Runner & Motorcycles Location: Jax, FL. Posts: 5 Thanks: 0 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	89 Octane Ethanol Free vs 91 10% Hey all, picking up my new (to me) 13 FR-S this week. Here in NE Florida we have a good supply of e-free gas, with one exception. It's 89 octane. I've been using it in my motorcycles with great results. I know the minimum octane recommendation is 91 (US). Is using the 89 octane e-free an option, even if maybe applying some OTC octane booster? Or should I stick with 91 octane 10%? The car only has 22k miles, and the chirping TSB has already been taken care of. Just looking out for the future on my newly acquired investment. Thanks!

11-08-2016, 10:14 AM	#3
D_Thissen Senior Member Join Date: Jan 2014 Drives: '13 Argento FR-S (Sold) Location: Ontario Posts: 2,126 Thanks: 3,209 Thanked 1,439 Times in 855 Posts Mentioned: 19 Post(s) Tagged: 2 Thread(s)	No..89 isn't an option. __________________ My FR-S Build IG: dthissen

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11-08-2016, 12:47 PM	#4
86Boyz Senior Member Join Date: Oct 2016 Drives: on the highway to hell Location: SoCal Posts: 307 Thanks: 60 Thanked 177 Times in 98 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I used 89 a few times just for the heck of it when I was in Florida. It didn't make a difference in performance to me and probably shortened the life of the engine in the long run. Buy 93 premium and stick with it. Shell V-Power Nitro+ is a great option.

11-08-2016, 03:56 PM	#7
gmanvilla1@gmail.com Member Join Date: May 2015 Drives: FRS Location: Fort Lauderdale Posts: 58 Thanks: 3 Thanked 5 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Or go with OFT tune and corn fuel. You will never go back. Sent from my iPhone using Tapatalk

11-08-2016, 04:50 PM	#12
Tokay444 Banned Join Date: Feb 2016 Drives: 17 White 860. RCE Tarmac 2. RE-71RS Location: Not Canada Posts: 1,752 Thanks: 938 Thanked 1,024 Times in 581 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Food for thought. Ethanol has an effective octane rating of 160 in a direct injection application.

11-08-2016, 05:46 PM	#14
Cole Not a troll Join Date: Apr 2015 Drives: FR-S Location: Canada Posts: 5,104 Thanks: 8,237 Thanked 5,399 Times in 2,694 Posts Mentioned: 266 Post(s) Tagged: 4 Thread(s)	Hahahaha hahahaha Jesus Christ, does no one read the fucking manual anymore? In regards to the fuel pump TSB, you'll get crickets again. Here's a very simple solution, instead of worrying about the noise your pump is making (which, let's be honest, is normal operation for it) try driving your car between 4 and 7 thousand RPM more often.

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