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09-10-2013, 02:34 PM
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#1 |
 Drives: 2012 Camaro 1LT RS Join Date: Apr 2013
Location: Lake Wales, FL
Posts: 62
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Whats the best octane to run in the LFX?
87, 89, 93 all with ethanol or 90 octane with no ethanol but its hard to find. Ive been running 93 for a while.
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09-10-2013, 04:11 PM
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#2 |
 
Drives: 2013 camaro ls; 2005 rx8 Join Date: Mar 2013
Location: Houston
Posts: 577
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I run 93 out of habit from my old car...
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09-10-2013, 04:17 PM
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#3 |
    
Drives: 2012 SIM 2LT/1970 Camaro Join Date: Nov 2012
Location: Near Minneapolis, MN
Posts: 1,578
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This is a topic where you'll get lots of opinions, and has been much-discussed in the past.
The LFX supposedly has 2 timing tables, but can't adjust to the higher octane table without a tune. Using higher octane gas may reduce some knock retard, but the LFX sees a more limited benefit than the LLT. You can run 87 octane and things will be fine, though you may be losing a small (probably unnoticeable) amount of performance, IMO.
__________________
All bleeding stops eventually -- 2012 2LT Auto w/sunroof -- My journal thread
Roto-Fab Intake & W/W Relocate Kit -- ADM Race Scoop -- Dynomax VT Axle-Back Exhaust -- Vitesse Throttle Controller RX Catch Can -- Drake Bowtie Delete -- JacFab Radio Face Cover -- LED Fog Lights -- LED Dome/Trunk/Plate Lights -- Gen5DIY Dash ABL -- Diode Dynamics Cupholder Lighting Wishlist: ACS T5 Splitter -- Hood Vent Mod -- Footwell/Door Pull/Homelink Button Lighting |
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09-10-2013, 05:09 PM
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#4 |
     
Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009
Location: Tampa
Posts: 5,111
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I always try to run Shell 93. Tried different brands and for me the Shell 93 runs the best.
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Sold 2012 2LT RS 12.3@112 old setup
Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 ** Born 3/17/17**Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. **807hp/762tq on 93 gas** and **848hp/792tq on e47** Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive |
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09-10-2013, 06:47 PM
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#5 |
Drives: 2012 LS M6, Black Join Date: May 2009
Location: Phoenix, AZ
Posts: 2,045
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We get 91, tops, here in Phoenix, unless you get all exotic and buy "race" fuel.
My understanding is that there aren't specific timing maps that the LFX adheres to, but rather a range of allowed advance and the engine listens to its knock sensors, dialing in timing retardation as knock becomes detectable to them. But what do I know? I sell floor covering. John B.
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 12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB1995 Mitsubishi Montero SR 1987 Dodge Raider Turbo Project 1986 Mitsubishi Montero 2.4l FI Transplant |
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09-10-2013, 07:05 PM
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#6 |
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Lifetime Philly Fan
Drives: 2015 Spring Edition 2SS M-6 Join Date: Mar 2012
Location: South Central Florida
Posts: 1,861
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I run 89 in mine. Unless I'm driving long distance, then I run 92 or 93 for the better gas mileage.
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2015 Green Flash, Delivered 4/10/15
CAI, NPP Exhaust, Short-throw shifter BBK LT HEADERS 1 7/8” Tune by DynoSteve via SCTx4 Tuner One of 82 GF Ragtops built in '15 out of 811 Total [/SIZE]  |
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09-10-2013, 08:30 PM
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#7 |
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The LFX came from GM being able to run 87 no problem, which is amazing considering its 11.5 to 1 compression ratio. I personally put 93 in it cuz i tend to run her hard and knowing it wont hurt. At the end of the day you should be fine with 87, even with basic bolt ons. Going F/I is a different story though.
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09-10-2013, 08:35 PM
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#8 |
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Drives: 2012 LS M6, Black Join Date: May 2009
Location: Phoenix, AZ
Posts: 2,045
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Oh yeah, I have to run 91 now.
John B.
__________________
12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB1995 Mitsubishi Montero SR 1987 Dodge Raider Turbo Project 1986 Mitsubishi Montero 2.4l FI Transplant |
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09-11-2013, 01:10 AM
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#9 | |
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Drives: 2012 SIM 2LT/1970 Camaro Join Date: Nov 2012
Location: Near Minneapolis, MN
Posts: 1,578
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Quote:
Granted, one of the participants' "knowledge" has since been brought into question, but I would still trust GretchenGotGrowl's and KMPrenger's opinion. But I'm just regurgitating the knowledge of others. I can't claim to have firsthand experience. What do I know? I carry morbidly obese people down stairs for a living. 
__________________
All bleeding stops eventually -- 2012 2LT Auto w/sunroof -- My journal thread
Roto-Fab Intake & W/W Relocate Kit -- ADM Race Scoop -- Dynomax VT Axle-Back Exhaust -- Vitesse Throttle Controller RX Catch Can -- Drake Bowtie Delete -- JacFab Radio Face Cover -- LED Fog Lights -- LED Dome/Trunk/Plate Lights -- Gen5DIY Dash ABL -- Diode Dynamics Cupholder Lighting Wishlist: ACS T5 Splitter -- Hood Vent Mod -- Footwell/Door Pull/Homelink Button Lighting |
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