Consequences? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Muskoka800 · 11-12-2021, 11:15 AM

I’ll be installing an Edelbrock S/C on my otherwise stock engine soon. A CSG stage 1 tune will be used.
What would be the consequence of tuning for 94 octane fuel but having to use 91 octane in a pinch? 94 can be hard to find in rural (northern) areas of Ontario.
91 would just be a stopgap until finding a 94 station and only during street driving. Not on track.
Thanks in advance for your constructive responses.

NoHaveMSG · 11-12-2021, 12:51 PM

It could knock, in response the ECU will pull timing and drop IAM.

tomm.brz · 11-12-2021, 02:19 PM

Quote:

Originally Posted by NoHaveMSG

It could knock, in response the ECU will pull timing and drop IAM.

it WILL knock, lot of times
With ecutek you get 4 different ignition tables and maps, get your car e-tuned for 91 oct

Hurricane Nate · 11-14-2021, 12:35 PM

Quote:

Originally Posted by Muskoka800

I’ll be installing an Edelbrock S/C on my otherwise stock engine soon. A CSG stage 1 tune will be used.
What would be the consequence of tuning for 94 octane fuel but having to use 91 octane in a pinch? 94 can be hard to find in rural (northern) areas of Ontario.
91 would just be a stopgap until finding a 94 station and only during street driving. Not on track.
Thanks in advance for your constructive responses.

Talk to the guys at CSG about it. Speaking from personal experience, they are very responsive to inputs from you during the process of e-tuning your engine, and they’ll give you great feedback on what they think will be a best fit for you and your engine.

Kiske · 11-14-2021, 03:35 PM

If your tuning with ecutek just have the tuner give you a safe 91oct map. You can change maps while driving via the cruise control stalk. Let your default tune be map 1 and your low performance map for the other one. If you ever put 91 in the car- switch maps and a never worry again.

jflogerzi · 11-14-2021, 08:33 PM

as others have said get a safe map for when on 91 and switch to it as needed.

Muskoka800 · 11-15-2021, 11:34 AM

Thanks all!
I will discuss the dual map option with my CSG tuner.
If it’s as simple as a stroke of the cruise control switch, I’m in.

LRNAD90 · 04-18-2022, 02:08 PM

Old thread, but couldn't you just keep a bottle of octane booster in the truck for those times?

tomm.brz · 04-18-2022, 02:47 PM

Depends on which bottle you mean, it must be something that works like bardhal bsf

Also would be wise to make a map using normal fuel + this booster and retune with that

Sapphireho · 04-18-2022, 07:51 PM

Quote:

Originally Posted by LRNAD90

Old thread, but couldn't you just keep a bottle of octane booster in the truck for those times?

That and pickled garlic.

Qwimby1 · 05-01-2022, 11:57 AM

I don't know if this is relevant, but my Porsche-Club group ran Mosport once and were all about to fill up on 91, which was all we could find. A local guy came by and hipped us to where we could get 93. The only guy who missed the tip filled his 944 Porsche turbo with 91 and burned a valve. He had to take it back to the states on a trailer.

11-12-2021, 11:15 AM	#1
Muskoka800 Senior Member Join Date: Jul 2018 Drives: 2016 Scion FRS Release Series 2#439 Location: Chatham, Ontario, Canada Posts: 778 Thanks: 4 Thanked 169 Times in 139 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Consequences? I’ll be installing an Edelbrock S/C on my otherwise stock engine soon. A CSG stage 1 tune will be used. What would be the consequence of tuning for 94 octane fuel but having to use 91 octane in a pinch? 94 can be hard to find in rural (northern) areas of Ontario. 91 would just be a stopgap until finding a 94 station and only during street driving. Not on track. Thanks in advance for your constructive responses.

11-14-2021, 03:35 PM	#5
Kiske Senior Member Join Date: Jun 2013 Drives: RX-7 / BRZ Location: USA Posts: 2,349 Thanks: 1,031 Thanked 2,501 Times in 1,081 Posts Mentioned: 27 Post(s) Tagged: 0 Thread(s)	If your tuning with ecutek just have the tuner give you a safe 91oct map. You can change maps while driving via the cruise control stalk. Let your default tune be map 1 and your low performance map for the other one. If you ever put 91 in the car- switch maps and a never worry again. __________________ //2013 World Rally Blue BRZ Limited FBM Turbo--gone //2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged

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11-15-2021, 11:34 AM	#7
Muskoka800 Senior Member Join Date: Jul 2018 Drives: 2016 Scion FRS Release Series 2#439 Location: Chatham, Ontario, Canada Posts: 778 Thanks: 4 Thanked 169 Times in 139 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Thanks all! I will discuss the dual map option with my CSG tuner. If it’s as simple as a stroke of the cruise control switch, I’m in.

04-18-2022, 02:08 PM	#8
LRNAD90 Senior Member Join Date: Feb 2022 Drives: X5 35d, D90, CX-5 Turbo Location: Maryland Posts: 338 Thanks: 83 Thanked 226 Times in 126 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Old thread, but couldn't you just keep a bottle of octane booster in the truck for those times?

04-18-2022, 02:47 PM	#9
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,280 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	Depends on which bottle you mean, it must be something that works like bardhal bsf Also would be wise to make a map using normal fuel + this booster and retune with that

05-01-2022, 11:57 AM	#11
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 599 Thanks: 139 Thanked 150 Times in 110 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I don't know if this is relevant, but my Porsche-Club group ran Mosport once and were all about to fill up on 91, which was all we could find. A local guy came by and hipped us to where we could get 93. The only guy who missed the tip filled his 944 Porsche turbo with 91 and burned a valve. He had to take it back to the states on a trailer.

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