M3 tuned to 92 oct but refilling with 91...good/bad/no worries?

Route 16 · 12-21-2017, 05:04 PM

I’m getting ready for a road trip from WA state (92 oct) to CA (91 oct) since my motor tune is flashed to 92 oct.

Will it suffer mechanically? Knock? I’m not worried about mileage or throttle loss. I just don’t want to flash in between gas pumps when my wife and kids are whining to hurry up and drive.

TrAcK TRaP · 12-21-2017, 07:27 PM

If you don't go wot I don't see any problem. Or keep couple of octane booster in the car (nos or vp racing octanium only)

Dave07997S · 12-22-2017, 10:48 AM

No issues

joe6mt · 12-22-2017, 11:10 AM

The power increase isn't going to be substantial between the two to begin with. You should be no issues at all.

Route 16 · 01-05-2018, 05:52 PM

I just drove 2200+ miles on 93 flash for 6 days, starting with 92 octane on 2 tanks, 4 tanks of 91, 2 tanks of 92. All in all, no problem whatsoever, didn't experience hiccups, SES light, delay in power. But I will be uploading a 92 flash.

12-21-2017, 05:04 PM	#1
Route 16 I got lei'd 921 Rep 7,618 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	M3 tuned to 92 oct but refilling with 91...good/bad/no worries? I’m getting ready for a road trip from WA state (92 oct) to CA (91 oct) since my motor tune is flashed to 92 oct. Will it suffer mechanically? Knock? I’m not worried about mileage or throttle loss. I just don’t want to flash in between gas pumps when my wife and kids are whining to hurry up and drive.
	Appreciate 0 Tweet Quote

12-21-2017, 07:27 PM	#2
TrAcK TRaP bOrN To DiE 424 Rep 1,737 Posts Drives: 2011 E92 M3 ZCP Join Date: Apr 2013 Location: South Jersey iTrader: (0)	If you don't go wot I don't see any problem. Or keep couple of octane booster in the car (nos or vp racing octanium only)
	Appreciate 1 Route 16920.50 Quote

12-22-2017, 10:48 AM	#3
Dave07997S Major General 2342 Rep 5,139 Posts Drives: 2024 BMW M2 Toronto Red 6MT Join Date: May 2009 Location: El Segundo, CA iTrader: (1)	No issues
	Appreciate 1 Route 16920.50 Quote

12-22-2017, 11:10 AM	#4
joe6mt Private First Class 69 Rep 131 Posts Drives: 2012 M3/6MT Join Date: Nov 2016 Location: Illinois iTrader: (3)	The power increase isn't going to be substantial between the two to begin with. You should be no issues at all. __________________ 2012 E92 M3 w/ Competition Package
	Appreciate 1 Route 16920.50 Quote

01-05-2018, 05:52 PM	#5
Route 16 I got lei'd 921 Rep 7,618 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	I just drove 2200+ miles on 93 flash for 6 days, starting with 92 octane on 2 tanks, 4 tanks of 91, 2 tanks of 92. All in all, no problem whatsoever, didn't experience hiccups, SES light, delay in power. But I will be uploading a 92 flash.
	Appreciate 0 Quote