anyone experience engine knock on 91 octane? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

chenshuo · 01-11-2013, 10:20 PM

as i was reading the manual i noticed that it says "if 93 oct is not available you can use 91 but might experience knocking". I can only find 91 in Canada so wondering if engine will knock.

Getting my car next week so can't tell myself.

Gixxersixxerman · 01-11-2013, 10:26 PM

We only have 91 here in so cal, and I live in the high desert and go up mountain passes quite a bit.. On my way to work a twice a day lol.. And I've n
Heard no knock yet.. If it is there I haven't noticed yet

ziggz501 · 01-11-2013, 10:51 PM

i have to use 90 in alaska, and i'm at sea level. works fine.

Subynewbie · 01-12-2013, 12:26 AM

Petrocanada sells 94 octane at most locations.

chenshuo · 01-12-2013, 01:11 AM

Quote:

Originally Posted by Subynewbie

Petrocanada sells 94 octane at most locations.

is that what you use? must be really expensive.

Subynewbie · 01-12-2013, 09:21 AM

Quote:

Originally Posted by chenshuo

is that what you use? must be really expensive.

I use it most of the time. Some people swear by shells premium, which is 91 here. It is ethanol free.

GerryL · 01-12-2013, 10:51 AM

Quote:

Originally Posted by Gixxersixxerman

We only have 91 here in so cal, and I live in the high desert and go up mountain passes quite a bit.. On my way to work a twice a day lol.. And I've n
Heard no knock yet.. If it is there I haven't noticed yet

Actually higher altitude would have less of an octane requirement as the thinner air effectively reduces the compression.

llama_au · 01-13-2013, 06:22 AM

Woah! I wouldn't dream of running anything under 98 octane (non-ethanol), though I guess that sounds a bit easier here in Australia than for you guys. 91 octane is our minimum fuel here, then 95, then 98 and we used to have 100 octane on pump at selected stations (non-ethanol.)

Guff · 01-13-2013, 06:38 AM

Quote:

Originally Posted by llama_au

Woah! I wouldn't dream of running anything under 98 octane (non-ethanol), though I guess that sounds a bit easier here in Australia than for you guys. 91 octane is our minimum fuel here, then 95, then 98 and we used to have 100 octane on pump at selected stations (non-ethanol.)

The difference is because you guys use RON in Oz, and we use AKI in the states, which is an average of RON and MON. Ours will show 4-5 points lower but is still equivalent to yours. So your 98 is our 93.

llama_au · 01-13-2013, 06:49 AM

Oh I see, thanks for the explanation. I was getting worried!

Jaylyons1 · 01-13-2013, 09:54 AM

Quote:

Originally Posted by ziggz501

i have to use 90 in alaska, and i'm at sea level. works fine.

Torco FTW!

Admiral Ballsy · 01-13-2013, 10:39 AM

Driving at anything other than WOT reduces effective compression too, so you'd really only expect to experience knock at full-throttle.

Wankel Rex · 01-13-2013, 01:58 PM

I get stuck with 91 in certain parts of OK and MO when I'm driving between Ft. Worth and St. Louis. Only issue I've seen is a few misfires on cold morning starts. Dealer checked it out and the only recommendation they had was to use 93.

I haven't had the issue lately, but it hasn't been as cold.

Looker_007 · 01-13-2013, 04:58 PM

Generally use Shell 91 without problems. Have used other stuff on the 401 to and from To without problems and Irving in Vermont.

01-11-2013, 10:20 PM	#1
chenshuo Senior Member Join Date: Nov 2012 Drives: WRB BRZ Location: Toronto Posts: 1,260 Thanks: 259 Thanked 473 Times in 245 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	anyone experience engine knock on 91 octane? as i was reading the manual i noticed that it says "if 93 oct is not available you can use 91 but might experience knocking". I can only find 91 in Canada so wondering if engine will knock. Getting my car next week so can't tell myself.

01-13-2013, 06:22 AM	#8
llama_au Loud Noises Join Date: Jun 2012 Drives: BRZ & YGZ11 Cube3 Location: Victoria, Australia Posts: 160 Thanks: 13 Thanked 13 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Woah! I wouldn't dream of running anything under 98 octane (non-ethanol), though I guess that sounds a bit easier here in Australia than for you guys. 91 octane is our minimum fuel here, then 95, then 98 and we used to have 100 octane on pump at selected stations (non-ethanol.) __________________ Proud owner of an April 2013 WR Blue Mica BRZ Premium Pack

01-13-2013, 06:49 AM	#10
llama_au Loud Noises Join Date: Jun 2012 Drives: BRZ & YGZ11 Cube3 Location: Victoria, Australia Posts: 160 Thanks: 13 Thanked 13 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Oh I see, thanks for the explanation. I was getting worried! __________________ Proud owner of an April 2013 WR Blue Mica BRZ Premium Pack

01-13-2013, 04:58 PM	#14
Looker_007 Member Join Date: Sep 2012 Drives: Firstorm A/T Location: Near Montreal Posts: 21 Thanks: 9 Thanked 16 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Super in Montreal Generally use Shell 91 without problems. Have used other stuff on the 401 to and from To without problems and Irving in Vermont.

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01-11-2013, 10:26 PM	#2
Gixxersixxerman Senior Member Join Date: Aug 2012 Drives: Toyota GT86, 66 beetle, 11 GSXR 750 Location: Las Vegas, NV. Posts: 1,382 Thanks: 575 Thanked 836 Times in 436 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	We only have 91 here in so cal, and I live in the high desert and go up mountain passes quite a bit.. On my way to work a twice a day lol.. And I've n Heard no knock yet.. If it is there I haven't noticed yet

01-13-2013, 01:58 PM	#13
Wankel Rex Senior Member Join Date: Aug 2012 Drives: Silver Premium Edition BRZ Location: Ft. Worth, TX Posts: 102 Thanks: 34 Thanked 33 Times in 26 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I get stuck with 91 in certain parts of OK and MO when I'm driving between Ft. Worth and St. Louis. Only issue I've seen is a few misfires on cold morning starts. Dealer checked it out and the only recommendation they had was to use 93. I haven't had the issue lately, but it hasn't been as cold.

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