Been Using 91 instead of 93 - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

hmong337 · 09-20-2013, 03:17 AM

Quote:

Originally Posted by wparsons

I alternate between Shell 91 (0% ethanol) and Petro 94 (up to 10% ethanol) and don't notice much difference most of the time. I do notice a bit of knock on throttle tip in on REALLY hot days at very low rpm's on Shell 91, but nothing up top and it's a very brief knock.

I don't know about you but when I pump PC94, the power increase over 91 Vpower is noticable. Sure the 91 gets rid of the crickets somewhat, but it's a lot down on power compared to pc94.

The car was meant to run on 93 optimally as per owners manual. I just believe the crickets came with the car so don't care to pump 91vpower anymore and go straight pc94. Sure the car runs on 91 Vpower, but it's certainly not running at its most optimal. Pc94 and crickets FTW I guess...

91vpower vs pc94 is even more evident in my mr2. You can totally tell the engine is pulling back timing due to lower octane. I would just stick with the pc94, live with the chirps, and be done with it. I've still had chirps with 91vpower fwiw.

Owners manual did say it was okay up to 10% ethanol mix. But some people run e85 with no issues

wparsons · 09-20-2013, 09:23 AM

I can't say I feel a definite power difference between shell 91 and petro 94, but I can definitely say there is a difference in mileage, especially with pure city driving. For daily driving, I've been sticking with shell 91 since I do get noticeably better mileage. That said, anytime it's bee on a track or autox I only run petro 94.

FR-S.13 · 09-20-2013, 09:45 AM

I'd guess the ECU on our car is tuned for 91, which is the lowest common denominator as far as octane is concerned.

smbstyle · 09-20-2013, 09:57 AM

I'd drive on 91 if I absolutely had to, but would not push the car hard on anything less than 93.

This is just my opinion from everything happening with the DI seal issue, but the majority appear to be happening on the west coast, where there's only 91 octane. I'm sure there's more to it than just that, but just a pattern I noticed.

Mad1723 · 09-22-2013, 03:33 PM

Quote:

Originally Posted by LeeMaster

No worries, today I witnessed an FRS owner putting 87 gas into their tank. Poor car

You proceeded to beat his ass to the ground I assume?

ciro · 09-22-2013, 04:03 PM

i notice 91 is not as much power as 93

LeeMaster · 09-23-2013, 12:31 AM

Quote:

Originally Posted by Mad1723

You proceeded to beat his ass to the ground I assume?

Wasnt my car so no care.

jflogerzi · 09-28-2013, 12:49 AM

Quote:

Originally Posted by LeeMaster

No worries, today I witnessed an FRS owner putting 87 gas into their tank. Poor car

fool

Gaiseric · 09-28-2013, 08:21 AM

Your car is going to blow up bro.

09-20-2013, 09:45 AM	#17
FR-S.13 Member Join Date: Jun 2013 Drives: 2021 Supra 3.0 premium Location: Ohio, 'Murica Posts: 53 Thanks: 62 Thanked 38 Times in 21 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'd guess the ECU on our car is tuned for 91, which is the lowest common denominator as far as octane is concerned.

09-20-2013, 09:57 AM	#18
smbstyle Senior Member Join Date: Apr 2013 Drives: 2013 SWP BRZ Location: Forsyth, GA Posts: 1,008 Thanks: 224 Thanked 681 Times in 302 Posts Mentioned: 26 Post(s) Tagged: 0 Thread(s)	I'd drive on 91 if I absolutely had to, but would not push the car hard on anything less than 93. This is just my opinion from everything happening with the DI seal issue, but the majority appear to be happening on the west coast, where there's only 91 octane. I'm sure there's more to it than just that, but just a pattern I noticed.

09-22-2013, 04:03 PM	#20
ciro Senior Member Join Date: Jun 2013 Drives: Scion FR-S Location: minnesota Posts: 240 Thanks: 61 Thanked 84 Times in 49 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	i notice 91 is not as much power as 93

09-28-2013, 08:21 AM	#23
Gaiseric Senior Member Join Date: Oct 2012 Drives: 2012 Scion TC Location: Tampa Posts: 143 Thanks: 19 Thanked 69 Times in 36 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Your car is going to blow up bro.

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