Flex fuel plugs & gap

Xer0449 · 07-05-2021, 04:02 PM

*Edit

Steve @ WedgePerformance called for NGK 97506 @ .022

Hey all,

Looking to go the MHD CAN flex route with the F80.
I keep reading about the recommended plugs and gaps for either 93 or full E85, but cannot find anything definitive about those going the flex route.

Does anyone have any input or experience on this?

For context: Stock turbos & fuel system, catless DP's, probably going for 75/80% of max effort in order to keep the turbskis happy.

Thanks

Wanted_M · 07-05-2021, 04:52 PM

I've seen folks running gap from .020-.023 with no issues and some as low as .018.
I suggest ask your tuner for your specific mods.

hellokitty · 07-06-2021, 12:50 AM

I’m running NGK 97505s on .022 gap on close to full E85 (E70).

Pulls very strong but I’ll likely drop down to .020 when I change out my coils.

hellokitty · 07-18-2021, 07:30 AM

I changed out to ngk f8s plugs and gapped to .020.

Car is much happier now on flex fuel.

n8dgr84 · 10-02-2023, 06:13 PM

Quote:

Originally Posted by hellokitty

I changed out to ngk f8s plugs and gapped to .020.

Car is much happier now on flex fuel.

Sorry to wake the dead here but can you describe the driveability difference between the 97506 and F8S?

07-05-2021, 04:02 PM	#1
Xer0449 First Lieutenant 102 Rep 313 Posts Drives: 14' Evo GSR Join Date: Jun 2016 Location: LA iTrader: (3)	Flex fuel plugs & gap Edit Steve @ WedgePerformance called for NGK 97506 @ .022 Hey all, Looking to go the MHD CAN flex route with the F80. I keep reading about the recommended plugs and gaps for either 93 or full E85, but cannot find anything definitive about those going the flex route. Does anyone have any input or experience on this? For context: Stock turbos & fuel system, catless DP's, probably going for 75/80% of max effort in order to keep the turbskis happy. Thanks __________________ linux n' boost Last edited by Xer0449; 07-05-2021 at 11:31 PM..*
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07-05-2021, 04:52 PM	#2
Wanted_M Captain 768 Rep 955 Posts Drives: Frozen Blue M4CS Join Date: Jul 2009 Location: Norcal iTrader: (2)	I've seen folks running gap from .020-.023 with no issues and some as low as .018. I suggest ask your tuner for your specific mods. __________________ M4CS Frozen Blue ARM DP's/Resonated Mid-pipe \| SPL links \| Hotchkis bars \| JRZ RS2/camber plates \| K&N \| Koyorad HX \| Powerflex purple \| Rouge \| Spiegler \| Speed Eng. snorkel \| Vargas CBC/hub \| Wagner IC \| xHP \| Xpel stealth ppf
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07-06-2021, 12:50 AM	#3
hellokitty Brigadier General 2899 Rep 3,729 Posts Drives: '17 M3 ZCP DCT Join Date: Jul 2010 Location: Southern California iTrader: (2)	I’m running NGK 97505s on .022 gap on close to full E85 (E70). Pulls very strong but I’ll likely drop down to .020 when I change out my coils.
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07-18-2021, 07:30 AM	#4
hellokitty Brigadier General 2899 Rep 3,729 Posts Drives: '17 M3 ZCP DCT Join Date: Jul 2010 Location: Southern California iTrader: (2)	I changed out to ngk f8s plugs and gapped to .020. Car is much happier now on flex fuel. __________________ 2017 F80 M3 ZCP / AA GESI DPs / Akrapovic Evo / BBS FI-R 19" / Bend Calibration ECUTEK Flex Fuel \| Bilstein B16 DDC + CS EDC / BMC Filters / BMS OCC / CSF HE / ESS CP / Nitto NT555R2 / PD Crank Hub / SPL Suspension / Uniden R7 / Wagner Top Mount IC 2021 Mini GP3 / BMC Filters / BM3 / Cary Jordan E30 / Wagner IC / Remus Race
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